4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2010, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #define DEBUG_SUBSYSTEM S_RPC
35 #include <linux/kthread.h>
36 #include <linux/ratelimit.h>
38 #include <obd_support.h>
39 #include <obd_class.h>
40 #include <lustre_net.h>
41 #include <lu_object.h>
42 #include <uapi/linux/lnet/lnet-types.h>
43 #include "ptlrpc_internal.h"
44 #include <linux/delay.h>
46 /* The following are visible and mutable through /sys/module/ptlrpc */
47 int test_req_buffer_pressure = 0;
48 module_param(test_req_buffer_pressure, int, 0444);
49 MODULE_PARM_DESC(test_req_buffer_pressure, "set non-zero to put pressure on request buffer pools");
50 module_param(at_min, int, 0644);
51 MODULE_PARM_DESC(at_min, "Adaptive timeout minimum (sec)");
52 module_param(at_max, int, 0644);
53 MODULE_PARM_DESC(at_max, "Adaptive timeout maximum (sec)");
54 module_param(at_history, int, 0644);
55 MODULE_PARM_DESC(at_history,
56 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
57 module_param(at_early_margin, int, 0644);
58 MODULE_PARM_DESC(at_early_margin, "How soon before an RPC deadline to send an early reply");
59 module_param(at_extra, int, 0644);
60 MODULE_PARM_DESC(at_extra, "How much extra time to give with each early reply");
63 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt);
64 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req);
65 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req);
67 /** Holds a list of all PTLRPC services */
68 struct list_head ptlrpc_all_services;
69 /** Used to protect the \e ptlrpc_all_services list */
70 struct mutex ptlrpc_all_services_mutex;
72 static struct ptlrpc_request_buffer_desc *
73 ptlrpc_alloc_rqbd(struct ptlrpc_service_part *svcpt)
75 struct ptlrpc_service *svc = svcpt->scp_service;
76 struct ptlrpc_request_buffer_desc *rqbd;
78 OBD_CPT_ALLOC_PTR(rqbd, svc->srv_cptable, svcpt->scp_cpt);
82 rqbd->rqbd_svcpt = svcpt;
83 rqbd->rqbd_refcount = 0;
84 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
85 rqbd->rqbd_cbid.cbid_arg = rqbd;
86 INIT_LIST_HEAD(&rqbd->rqbd_reqs);
87 OBD_CPT_ALLOC_LARGE(rqbd->rqbd_buffer, svc->srv_cptable,
88 svcpt->scp_cpt, svc->srv_buf_size);
89 if (rqbd->rqbd_buffer == NULL) {
94 spin_lock(&svcpt->scp_lock);
95 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
96 svcpt->scp_nrqbds_total++;
97 spin_unlock(&svcpt->scp_lock);
102 static void ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
104 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
106 LASSERT(rqbd->rqbd_refcount == 0);
107 LASSERT(list_empty(&rqbd->rqbd_reqs));
109 spin_lock(&svcpt->scp_lock);
110 list_del(&rqbd->rqbd_list);
111 svcpt->scp_nrqbds_total--;
112 spin_unlock(&svcpt->scp_lock);
114 OBD_FREE_LARGE(rqbd->rqbd_buffer, svcpt->scp_service->srv_buf_size);
118 static int ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
120 struct ptlrpc_service *svc = svcpt->scp_service;
121 struct ptlrpc_request_buffer_desc *rqbd;
125 if (svcpt->scp_rqbd_allocating)
128 spin_lock(&svcpt->scp_lock);
129 /* check again with lock */
130 if (svcpt->scp_rqbd_allocating) {
131 /* NB: we might allow more than one thread in the future */
132 LASSERT(svcpt->scp_rqbd_allocating == 1);
133 spin_unlock(&svcpt->scp_lock);
137 svcpt->scp_rqbd_allocating++;
138 spin_unlock(&svcpt->scp_lock);
141 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
143 * NB: another thread might have recycled enough rqbds, we
144 * need to make sure it wouldn't over-allocate, see LU-1212.
146 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group ||
147 (svc->srv_nrqbds_max != 0 &&
148 svcpt->scp_nrqbds_total > svc->srv_nrqbds_max))
151 rqbd = ptlrpc_alloc_rqbd(svcpt);
154 CERROR("%s: Can't allocate request buffer\n",
161 spin_lock(&svcpt->scp_lock);
163 LASSERT(svcpt->scp_rqbd_allocating == 1);
164 svcpt->scp_rqbd_allocating--;
166 spin_unlock(&svcpt->scp_lock);
169 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
170 svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted,
171 svcpt->scp_nrqbds_total, rc);
175 rc = ptlrpc_server_post_idle_rqbds(svcpt);
181 * Part of Rep-Ack logic.
182 * Puts a lock and its mode into reply state assotiated to request reply.
184 void ptlrpc_save_lock(struct ptlrpc_request *req, struct lustre_handle *lock,
185 int mode, bool no_ack, bool convert_lock)
187 struct ptlrpc_reply_state *rs = req->rq_reply_state;
191 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
193 idx = rs->rs_nlocks++;
194 rs->rs_locks[idx] = *lock;
195 rs->rs_modes[idx] = mode;
196 rs->rs_difficult = 1;
197 rs->rs_no_ack = no_ack;
198 rs->rs_convert_lock = convert_lock;
200 EXPORT_SYMBOL(ptlrpc_save_lock);
203 struct ptlrpc_hr_partition;
205 struct ptlrpc_hr_thread {
206 int hrt_id; /* thread ID */
208 wait_queue_head_t hrt_waitq;
209 struct list_head hrt_queue;
210 struct ptlrpc_hr_partition *hrt_partition;
213 struct ptlrpc_hr_partition {
214 /* # of started threads */
215 atomic_t hrp_nstarted;
216 /* # of stopped threads */
217 atomic_t hrp_nstopped;
218 /* cpu partition id */
220 /* round-robin rotor for choosing thread */
222 /* total number of threads on this partition */
225 struct ptlrpc_hr_thread *hrp_thrs;
228 #define HRT_RUNNING 0
229 #define HRT_STOPPING 1
231 struct ptlrpc_hr_service {
232 /* CPU partition table, it's just cfs_cpt_table for now */
233 struct cfs_cpt_table *hr_cpt_table;
234 /** controller sleep waitq */
235 wait_queue_head_t hr_waitq;
236 unsigned int hr_stopping;
237 /** roundrobin rotor for non-affinity service */
238 unsigned int hr_rotor;
240 struct ptlrpc_hr_partition **hr_partitions;
244 struct list_head rsb_replies;
245 unsigned int rsb_n_replies;
246 struct ptlrpc_service_part *rsb_svcpt;
249 /** reply handling service. */
250 static struct ptlrpc_hr_service ptlrpc_hr;
253 * maximum mumber of replies scheduled in one batch
255 #define MAX_SCHEDULED 256
258 * Initialize a reply batch.
262 static void rs_batch_init(struct rs_batch *b)
264 memset(b, 0, sizeof(*b));
265 INIT_LIST_HEAD(&b->rsb_replies);
269 * Choose an hr thread to dispatch requests to.
272 struct ptlrpc_hr_thread *ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
274 struct ptlrpc_hr_partition *hrp;
277 if (svcpt->scp_cpt >= 0 &&
278 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
279 /* directly match partition */
280 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
283 rotor = ptlrpc_hr.hr_rotor++;
284 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
286 hrp = ptlrpc_hr.hr_partitions[rotor];
289 rotor = hrp->hrp_rotor++;
290 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
294 * Dispatch all replies accumulated in the batch to one from
295 * dedicated reply handling threads.
299 static void rs_batch_dispatch(struct rs_batch *b)
301 if (b->rsb_n_replies != 0) {
302 struct ptlrpc_hr_thread *hrt;
304 hrt = ptlrpc_hr_select(b->rsb_svcpt);
306 spin_lock(&hrt->hrt_lock);
307 list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
308 spin_unlock(&hrt->hrt_lock);
310 wake_up(&hrt->hrt_waitq);
311 b->rsb_n_replies = 0;
316 * Add a reply to a batch.
317 * Add one reply object to a batch, schedule batched replies if overload.
322 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
324 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
326 if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
327 if (b->rsb_svcpt != NULL) {
328 rs_batch_dispatch(b);
329 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
331 spin_lock(&svcpt->scp_rep_lock);
332 b->rsb_svcpt = svcpt;
334 spin_lock(&rs->rs_lock);
335 rs->rs_scheduled_ever = 1;
336 if (rs->rs_scheduled == 0) {
337 list_move(&rs->rs_list, &b->rsb_replies);
338 rs->rs_scheduled = 1;
341 rs->rs_committed = 1;
342 spin_unlock(&rs->rs_lock);
346 * Reply batch finalization.
347 * Dispatch remaining replies from the batch
348 * and release remaining spinlock.
352 static void rs_batch_fini(struct rs_batch *b)
354 if (b->rsb_svcpt != NULL) {
355 rs_batch_dispatch(b);
356 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
360 #define DECLARE_RS_BATCH(b) struct rs_batch b
364 * Put reply state into a queue for processing because we received
365 * ACK from the client
367 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
369 struct ptlrpc_hr_thread *hrt;
373 LASSERT(list_empty(&rs->rs_list));
375 hrt = ptlrpc_hr_select(rs->rs_svcpt);
377 spin_lock(&hrt->hrt_lock);
378 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
379 spin_unlock(&hrt->hrt_lock);
381 wake_up(&hrt->hrt_waitq);
385 void ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
389 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
390 assert_spin_locked(&rs->rs_lock);
391 LASSERT(rs->rs_difficult);
392 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
394 if (rs->rs_scheduled) { /* being set up or already notified */
399 rs->rs_scheduled = 1;
400 list_del_init(&rs->rs_list);
401 ptlrpc_dispatch_difficult_reply(rs);
404 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
406 void ptlrpc_commit_replies(struct obd_export *exp)
408 struct ptlrpc_reply_state *rs, *nxt;
409 DECLARE_RS_BATCH(batch);
413 rs_batch_init(&batch);
415 * Find any replies that have been committed and get their service
416 * to attend to complete them.
419 /* CAVEAT EMPTOR: spinlock ordering!!! */
420 spin_lock(&exp->exp_uncommitted_replies_lock);
421 list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
423 LASSERT(rs->rs_difficult);
424 /* VBR: per-export last_committed */
425 LASSERT(rs->rs_export);
426 if (rs->rs_transno <= exp->exp_last_committed) {
427 list_del_init(&rs->rs_obd_list);
428 rs_batch_add(&batch, rs);
431 spin_unlock(&exp->exp_uncommitted_replies_lock);
432 rs_batch_fini(&batch);
436 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
438 struct ptlrpc_request_buffer_desc *rqbd;
443 spin_lock(&svcpt->scp_lock);
445 if (list_empty(&svcpt->scp_rqbd_idle)) {
446 spin_unlock(&svcpt->scp_lock);
450 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
451 struct ptlrpc_request_buffer_desc,
454 /* assume we will post successfully */
455 svcpt->scp_nrqbds_posted++;
456 list_move(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
458 spin_unlock(&svcpt->scp_lock);
460 rc = ptlrpc_register_rqbd(rqbd);
467 spin_lock(&svcpt->scp_lock);
469 svcpt->scp_nrqbds_posted--;
470 list_move_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
473 * Don't complain if no request buffers are posted right now; LNET
474 * won't drop requests because we set the portal lazy!
477 spin_unlock(&svcpt->scp_lock);
482 static void ptlrpc_at_timer(cfs_timer_cb_arg_t data)
484 struct ptlrpc_service_part *svcpt;
486 svcpt = cfs_from_timer(svcpt, data, scp_at_timer);
488 svcpt->scp_at_check = 1;
489 svcpt->scp_at_checktime = ktime_get();
490 wake_up(&svcpt->scp_waitq);
493 static void ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
494 struct ptlrpc_service_conf *conf)
496 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
503 * Common code for estimating & validating threads number.
504 * CPT affinity service could have percpt thread-pool instead
505 * of a global thread-pool, which means user might not always
506 * get the threads number they give it in conf::tc_nthrs_user
507 * even they did set. It's because we need to validate threads
508 * number for each CPT to guarantee each pool will have enough
509 * threads to keep the service healthy.
511 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
512 init = max_t(int, init, tc->tc_nthrs_init);
515 * NB: please see comments in lustre_lnet.h for definition
516 * details of these members
518 LASSERT(tc->tc_nthrs_max != 0);
520 if (tc->tc_nthrs_user != 0) {
522 * In case there is a reason to test a service with many
523 * threads, we give a less strict check here, it can
524 * be up to 8 * nthrs_max
526 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
527 nthrs = total / svc->srv_ncpts;
528 init = max(init, nthrs);
532 total = tc->tc_nthrs_max;
533 if (tc->tc_nthrs_base == 0) {
535 * don't care about base threads number per partition,
536 * this is most for non-affinity service
538 nthrs = total / svc->srv_ncpts;
542 nthrs = tc->tc_nthrs_base;
543 if (svc->srv_ncpts == 1) {
547 * NB: Increase the base number if it's single partition
548 * and total number of cores/HTs is larger or equal to 4.
549 * result will always < 2 * nthrs_base
551 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
552 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
553 (tc->tc_nthrs_base >> i) != 0; i++)
554 nthrs += tc->tc_nthrs_base >> i;
557 if (tc->tc_thr_factor != 0) {
558 int factor = tc->tc_thr_factor;
562 * User wants to increase number of threads with for
563 * each CPU core/HT, most likely the factor is larger than
564 * one thread/core because service threads are supposed to
565 * be blocked by lock or wait for IO.
568 * Amdahl's law says that adding processors wouldn't give
569 * a linear increasing of parallelism, so it's nonsense to
570 * have too many threads no matter how many cores/HTs
575 (topology_sibling_cpumask(smp_processor_id())) > 1) {
576 /* weight is # of HTs */
577 /* depress thread factor for hyper-thread */
578 factor = factor - (factor >> 1) + (factor >> 3);
582 weight = cfs_cpt_weight(svc->srv_cptable, 0);
584 for (; factor > 0 && weight > 0; factor--, weight -= fade)
585 nthrs += min(weight, fade) * factor;
588 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
589 nthrs = max(tc->tc_nthrs_base,
590 tc->tc_nthrs_max / svc->srv_ncpts);
593 nthrs = max(nthrs, tc->tc_nthrs_init);
594 svc->srv_nthrs_cpt_limit = nthrs;
595 svc->srv_nthrs_cpt_init = init;
597 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
599 "%s: This service may have more threads (%d) than the given soft limit (%d)\n",
600 svc->srv_name, nthrs * svc->srv_ncpts,
606 * Initialize percpt data for a service
608 static int ptlrpc_service_part_init(struct ptlrpc_service *svc,
609 struct ptlrpc_service_part *svcpt, int cpt)
611 struct ptlrpc_at_array *array;
616 svcpt->scp_cpt = cpt;
617 INIT_LIST_HEAD(&svcpt->scp_threads);
619 /* rqbd and incoming request queue */
620 spin_lock_init(&svcpt->scp_lock);
621 mutex_init(&svcpt->scp_mutex);
622 INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
623 INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
624 INIT_LIST_HEAD(&svcpt->scp_req_incoming);
625 init_waitqueue_head(&svcpt->scp_waitq);
626 /* history request & rqbd list */
627 INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
628 INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
630 /* acitve requests and hp requests */
631 spin_lock_init(&svcpt->scp_req_lock);
634 spin_lock_init(&svcpt->scp_rep_lock);
635 INIT_LIST_HEAD(&svcpt->scp_rep_active);
636 INIT_LIST_HEAD(&svcpt->scp_rep_idle);
637 init_waitqueue_head(&svcpt->scp_rep_waitq);
638 atomic_set(&svcpt->scp_nreps_difficult, 0);
640 /* adaptive timeout */
641 spin_lock_init(&svcpt->scp_at_lock);
642 array = &svcpt->scp_at_array;
644 size = at_est2timeout(at_max);
645 array->paa_size = size;
646 array->paa_count = 0;
647 array->paa_deadline = -1;
649 /* allocate memory for scp_at_array (ptlrpc_at_array) */
650 OBD_CPT_ALLOC(array->paa_reqs_array,
651 svc->srv_cptable, cpt, sizeof(struct list_head) * size);
652 if (array->paa_reqs_array == NULL)
655 for (index = 0; index < size; index++)
656 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
658 OBD_CPT_ALLOC(array->paa_reqs_count,
659 svc->srv_cptable, cpt, sizeof(__u32) * size);
660 if (array->paa_reqs_count == NULL)
663 cfs_timer_setup(&svcpt->scp_at_timer, ptlrpc_at_timer,
664 (unsigned long)svcpt, 0);
667 * At SOW, service time should be quick; 10s seems generous. If client
668 * timeout is less than this, we'll be sending an early reply.
670 at_init(&svcpt->scp_at_estimate, 10, 0);
672 /* assign this before call ptlrpc_grow_req_bufs */
673 svcpt->scp_service = svc;
674 /* Now allocate the request buffers, but don't post them now */
675 rc = ptlrpc_grow_req_bufs(svcpt, 0);
677 * We shouldn't be under memory pressure at startup, so
678 * fail if we can't allocate all our buffers at this time.
686 if (array->paa_reqs_count != NULL) {
687 OBD_FREE(array->paa_reqs_count, sizeof(__u32) * size);
688 array->paa_reqs_count = NULL;
691 if (array->paa_reqs_array != NULL) {
692 OBD_FREE(array->paa_reqs_array,
693 sizeof(struct list_head) * array->paa_size);
694 array->paa_reqs_array = NULL;
701 * Initialize service on a given portal.
702 * This includes starting serving threads , allocating and posting rqbds and
705 struct ptlrpc_service *ptlrpc_register_service(struct ptlrpc_service_conf *conf,
707 struct dentry *debugfs_entry)
709 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
710 struct ptlrpc_service *service;
711 struct ptlrpc_service_part *svcpt;
712 struct cfs_cpt_table *cptable;
721 LASSERT(conf->psc_buf.bc_nbufs > 0);
722 LASSERT(conf->psc_buf.bc_buf_size >=
723 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
724 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
726 cptable = cconf->cc_cptable;
728 cptable = cfs_cpt_table;
730 if (conf->psc_thr.tc_cpu_bind > 1) {
731 CERROR("%s: Invalid cpu bind value %d, only 1 or 0 allowed\n",
732 conf->psc_name, conf->psc_thr.tc_cpu_bind);
733 RETURN(ERR_PTR(-EINVAL));
736 if (!cconf->cc_affinity) {
739 ncpts = cfs_cpt_number(cptable);
740 if (cconf->cc_pattern != NULL) {
741 struct cfs_expr_list *el;
743 rc = cfs_expr_list_parse(cconf->cc_pattern,
744 strlen(cconf->cc_pattern),
747 CERROR("%s: invalid CPT pattern string: %s",
748 conf->psc_name, cconf->cc_pattern);
749 RETURN(ERR_PTR(-EINVAL));
752 rc = cfs_expr_list_values(el, ncpts, &cpts);
753 cfs_expr_list_free(el);
755 CERROR("%s: failed to parse CPT array %s: %d\n",
756 conf->psc_name, cconf->cc_pattern, rc);
758 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
759 RETURN(ERR_PTR(rc < 0 ? rc : -EINVAL));
765 OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
766 if (service == NULL) {
768 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
769 RETURN(ERR_PTR(-ENOMEM));
772 service->srv_cptable = cptable;
773 service->srv_cpts = cpts;
774 service->srv_ncpts = ncpts;
775 service->srv_cpt_bind = conf->psc_thr.tc_cpu_bind;
777 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
778 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
779 service->srv_cpt_bits++;
782 spin_lock_init(&service->srv_lock);
783 service->srv_name = conf->psc_name;
784 service->srv_watchdog_factor = conf->psc_watchdog_factor;
785 INIT_LIST_HEAD(&service->srv_list); /* for safty of cleanup */
787 /* buffer configuration */
788 service->srv_nbuf_per_group = test_req_buffer_pressure ?
789 1 : conf->psc_buf.bc_nbufs;
790 /* do not limit max number of rqbds by default */
791 service->srv_nrqbds_max = 0;
793 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
795 service->srv_buf_size = conf->psc_buf.bc_buf_size;
796 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
797 service->srv_req_portal = conf->psc_buf.bc_req_portal;
799 /* With slab/alloc_pages buffer size will be rounded up to 2^n */
800 if (service->srv_buf_size & (service->srv_buf_size - 1)) {
801 int round = size_roundup_power2(service->srv_buf_size);
803 service->srv_buf_size = round;
806 /* Increase max reply size to next power of two */
807 service->srv_max_reply_size = 1;
808 while (service->srv_max_reply_size <
809 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
810 service->srv_max_reply_size <<= 1;
812 service->srv_thread_name = conf->psc_thr.tc_thr_name;
813 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
814 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
815 service->srv_ops = conf->psc_ops;
817 for (i = 0; i < ncpts; i++) {
818 if (!cconf->cc_affinity)
821 cpt = cpts != NULL ? cpts[i] : i;
823 OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
825 GOTO(failed, rc = -ENOMEM);
827 service->srv_parts[i] = svcpt;
828 rc = ptlrpc_service_part_init(service, svcpt, cpt);
833 ptlrpc_server_nthreads_check(service, conf);
835 rc = LNetSetLazyPortal(service->srv_req_portal);
838 mutex_lock(&ptlrpc_all_services_mutex);
839 list_add(&service->srv_list, &ptlrpc_all_services);
840 mutex_unlock(&ptlrpc_all_services_mutex);
843 rc = ptlrpc_sysfs_register_service(parent, service);
848 if (debugfs_entry != NULL)
849 ptlrpc_ldebugfs_register_service(debugfs_entry, service);
851 rc = ptlrpc_service_nrs_setup(service);
855 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
856 service->srv_name, service->srv_req_portal);
858 rc = ptlrpc_start_threads(service);
860 CERROR("Failed to start threads for service %s: %d\n",
861 service->srv_name, rc);
867 ptlrpc_unregister_service(service);
870 EXPORT_SYMBOL(ptlrpc_register_service);
873 * to actually free the request, must be called without holding svc_lock.
874 * note it's caller's responsibility to unlink req->rq_list.
876 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
878 LASSERT(atomic_read(&req->rq_refcount) == 0);
879 LASSERT(list_empty(&req->rq_timed_list));
882 * DEBUG_REQ() assumes the reply state of a request with a valid
883 * ref will not be destroyed until that reference is dropped.
885 ptlrpc_req_drop_rs(req);
887 sptlrpc_svc_ctx_decref(req);
889 if (req != &req->rq_rqbd->rqbd_req) {
891 * NB request buffers use an embedded
892 * req if the incoming req unlinked the
893 * MD; this isn't one of them!
895 ptlrpc_request_cache_free(req);
900 * drop a reference count of the request. if it reaches 0, we either
901 * put it into history list, or free it immediately.
903 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
905 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
906 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
907 struct ptlrpc_service *svc = svcpt->scp_service;
909 struct list_head *tmp;
910 struct list_head *nxt;
912 if (!atomic_dec_and_test(&req->rq_refcount))
915 if (req->rq_session.lc_state == LCS_ENTERED) {
916 lu_context_exit(&req->rq_session);
917 lu_context_fini(&req->rq_session);
920 if (req->rq_at_linked) {
921 spin_lock(&svcpt->scp_at_lock);
923 * recheck with lock, in case it's unlinked by
924 * ptlrpc_at_check_timed()
926 if (likely(req->rq_at_linked))
927 ptlrpc_at_remove_timed(req);
928 spin_unlock(&svcpt->scp_at_lock);
931 LASSERT(list_empty(&req->rq_timed_list));
933 /* finalize request */
934 if (req->rq_export) {
935 class_export_put(req->rq_export);
936 req->rq_export = NULL;
939 spin_lock(&svcpt->scp_lock);
941 list_add(&req->rq_list, &rqbd->rqbd_reqs);
943 refcount = --(rqbd->rqbd_refcount);
945 /* request buffer is now idle: add to history */
946 list_move_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
947 svcpt->scp_hist_nrqbds++;
951 * I expect only about 1 or 2 rqbds need to be recycled here
953 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
954 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
955 struct ptlrpc_request_buffer_desc,
958 list_del(&rqbd->rqbd_list);
959 svcpt->scp_hist_nrqbds--;
962 * remove rqbd's reqs from svc's req history while
963 * I've got the service lock
965 list_for_each(tmp, &rqbd->rqbd_reqs) {
966 req = list_entry(tmp, struct ptlrpc_request,
968 /* Track the highest culled req seq */
969 if (req->rq_history_seq >
970 svcpt->scp_hist_seq_culled) {
971 svcpt->scp_hist_seq_culled =
974 list_del(&req->rq_history_list);
977 spin_unlock(&svcpt->scp_lock);
979 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
980 req = list_entry(rqbd->rqbd_reqs.next,
981 struct ptlrpc_request,
983 list_del(&req->rq_list);
984 ptlrpc_server_free_request(req);
987 spin_lock(&svcpt->scp_lock);
989 * now all reqs including the embedded req has been
990 * disposed, schedule request buffer for re-use
991 * or free it to drain some in excess.
993 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == 0);
994 if (svcpt->scp_nrqbds_posted >=
995 svc->srv_nbuf_per_group ||
996 (svc->srv_nrqbds_max != 0 &&
997 svcpt->scp_nrqbds_total > svc->srv_nrqbds_max) ||
998 test_req_buffer_pressure) {
999 /* like in ptlrpc_free_rqbd() */
1000 svcpt->scp_nrqbds_total--;
1001 OBD_FREE_LARGE(rqbd->rqbd_buffer,
1005 list_add_tail(&rqbd->rqbd_list,
1006 &svcpt->scp_rqbd_idle);
1010 spin_unlock(&svcpt->scp_lock);
1011 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
1012 /* If we are low on memory, we are not interested in history */
1013 list_del(&req->rq_list);
1014 list_del_init(&req->rq_history_list);
1016 /* Track the highest culled req seq */
1017 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
1018 svcpt->scp_hist_seq_culled = req->rq_history_seq;
1020 spin_unlock(&svcpt->scp_lock);
1022 ptlrpc_server_free_request(req);
1024 spin_unlock(&svcpt->scp_lock);
1028 static void ptlrpc_add_exp_list_nolock(struct ptlrpc_request *req,
1029 struct obd_export *export, bool hp)
1031 __u16 tag = lustre_msg_get_tag(req->rq_reqmsg);
1034 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
1036 list_add(&req->rq_exp_list, &export->exp_reg_rpcs);
1037 if (tag && export->exp_used_slots)
1038 set_bit(tag - 1, export->exp_used_slots);
1041 static void ptlrpc_del_exp_list(struct ptlrpc_request *req)
1043 __u16 tag = lustre_msg_get_tag(req->rq_reqmsg);
1045 spin_lock(&req->rq_export->exp_rpc_lock);
1046 list_del_init(&req->rq_exp_list);
1047 if (tag && !req->rq_obsolete && req->rq_export->exp_used_slots)
1048 clear_bit(tag - 1, req->rq_export->exp_used_slots);
1049 spin_unlock(&req->rq_export->exp_rpc_lock);
1052 /** Change request export and move hp request from old export to new */
1053 void ptlrpc_request_change_export(struct ptlrpc_request *req,
1054 struct obd_export *export)
1056 if (req->rq_export != NULL) {
1057 LASSERT(!list_empty(&req->rq_exp_list));
1058 /* remove rq_exp_list from last export */
1059 ptlrpc_del_exp_list(req);
1060 /* export has one reference already, so it's safe to
1061 * add req to export queue here and get another
1062 * reference for request later
1064 spin_lock(&export->exp_rpc_lock);
1065 ptlrpc_add_exp_list_nolock(req, export, req->rq_ops != NULL);
1066 spin_unlock(&export->exp_rpc_lock);
1068 class_export_rpc_dec(req->rq_export);
1069 class_export_put(req->rq_export);
1072 /* request takes one export refcount */
1073 req->rq_export = class_export_get(export);
1074 class_export_rpc_inc(export);
1078 * to finish a request: stop sending more early replies, and release
1081 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
1082 struct ptlrpc_request *req)
1084 ptlrpc_server_hpreq_fini(req);
1086 ptlrpc_server_drop_request(req);
1090 * to finish an active request: stop sending more early replies, and release
1091 * the request. should be called after we finished handling the request.
1093 static void ptlrpc_server_finish_active_request(
1094 struct ptlrpc_service_part *svcpt,
1095 struct ptlrpc_request *req)
1097 spin_lock(&svcpt->scp_req_lock);
1098 ptlrpc_nrs_req_stop_nolock(req);
1099 svcpt->scp_nreqs_active--;
1101 svcpt->scp_nhreqs_active--;
1102 spin_unlock(&svcpt->scp_req_lock);
1104 ptlrpc_nrs_req_finalize(req);
1106 if (req->rq_export != NULL)
1107 class_export_rpc_dec(req->rq_export);
1109 ptlrpc_server_finish_request(svcpt, req);
1113 * This function makes sure dead exports are evicted in a timely manner.
1114 * This function is only called when some export receives a message (i.e.,
1115 * the network is up.)
1117 void ptlrpc_update_export_timer(struct obd_export *exp, time64_t extra_delay)
1119 struct obd_export *oldest_exp;
1120 time64_t oldest_time, new_time;
1127 * Compensate for slow machines, etc, by faking our request time
1128 * into the future. Although this can break the strict time-ordering
1129 * of the list, we can be really lazy here - we don't have to evict
1130 * at the exact right moment. Eventually, all silent exports
1131 * will make it to the top of the list.
1134 /* Do not pay attention on 1sec or smaller renewals. */
1135 new_time = ktime_get_real_seconds() + extra_delay;
1136 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1139 exp->exp_last_request_time = new_time;
1142 * exports may get disconnected from the chain even though the
1143 * export has references, so we must keep the spin lock while
1144 * manipulating the lists
1146 spin_lock(&exp->exp_obd->obd_dev_lock);
1148 if (list_empty(&exp->exp_obd_chain_timed)) {
1149 /* this one is not timed */
1150 spin_unlock(&exp->exp_obd->obd_dev_lock);
1154 list_move_tail(&exp->exp_obd_chain_timed,
1155 &exp->exp_obd->obd_exports_timed);
1157 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1158 struct obd_export, exp_obd_chain_timed);
1159 oldest_time = oldest_exp->exp_last_request_time;
1160 spin_unlock(&exp->exp_obd->obd_dev_lock);
1162 if (exp->exp_obd->obd_recovering) {
1163 /* be nice to everyone during recovery */
1168 /* Note - racing to start/reset the obd_eviction timer is safe */
1169 if (exp->exp_obd->obd_eviction_timer == 0) {
1170 /* Check if the oldest entry is expired. */
1171 if (ktime_get_real_seconds() >
1172 oldest_time + PING_EVICT_TIMEOUT + extra_delay) {
1174 * We need a second timer, in case the net was down and
1175 * it just came back. Since the pinger may skip every
1176 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1177 * we better wait for 3.
1179 exp->exp_obd->obd_eviction_timer =
1180 ktime_get_real_seconds() + 3 * PING_INTERVAL;
1181 CDEBUG(D_HA, "%s: Think about evicting %s from %lld\n",
1182 exp->exp_obd->obd_name,
1183 obd_export_nid2str(oldest_exp), oldest_time);
1186 if (ktime_get_real_seconds() >
1187 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1189 * The evictor won't evict anyone who we've heard from
1190 * recently, so we don't have to check before we start
1193 if (!ping_evictor_wake(exp))
1194 exp->exp_obd->obd_eviction_timer = 0;
1202 * Sanity check request \a req.
1203 * Return 0 if all is ok, error code otherwise.
1205 static int ptlrpc_check_req(struct ptlrpc_request *req)
1207 struct obd_device *obd = req->rq_export->exp_obd;
1210 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1211 req->rq_export->exp_conn_cnt)) {
1212 DEBUG_REQ(D_RPCTRACE, req,
1213 "DROPPING req from old connection %d < %d",
1214 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1215 req->rq_export->exp_conn_cnt);
1218 if (unlikely(obd == NULL || obd->obd_fail)) {
1220 * Failing over, don't handle any more reqs,
1221 * send error response instead.
1223 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1224 req, (obd != NULL) ? obd->obd_name : "unknown");
1226 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1227 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1228 !obd->obd_recovering) {
1229 DEBUG_REQ(D_ERROR, req,
1230 "Invalid replay without recovery");
1231 class_fail_export(req->rq_export);
1233 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1234 !obd->obd_recovering) {
1235 DEBUG_REQ(D_ERROR, req,
1236 "Invalid req with transno %llu without recovery",
1237 lustre_msg_get_transno(req->rq_reqmsg));
1238 class_fail_export(req->rq_export);
1242 if (unlikely(rc < 0)) {
1243 req->rq_status = rc;
1249 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1251 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1254 if (array->paa_count == 0) {
1255 del_timer(&svcpt->scp_at_timer);
1259 /* Set timer for closest deadline */
1260 next = array->paa_deadline - ktime_get_real_seconds() -
1263 ptlrpc_at_timer(cfs_timer_cb_arg(svcpt, scp_at_timer));
1265 mod_timer(&svcpt->scp_at_timer,
1266 jiffies + nsecs_to_jiffies(next * NSEC_PER_SEC));
1267 CDEBUG(D_INFO, "armed %s at %+llds\n",
1268 svcpt->scp_service->srv_name, next);
1272 /* Add rpc to early reply check list */
1273 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1275 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1276 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1277 struct ptlrpc_request *rq = NULL;
1283 if (req->rq_no_reply)
1286 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1289 spin_lock(&svcpt->scp_at_lock);
1290 LASSERT(list_empty(&req->rq_timed_list));
1292 div_u64_rem(req->rq_deadline, array->paa_size, &index);
1293 if (array->paa_reqs_count[index] > 0) {
1295 * latest rpcs will have the latest deadlines in the list,
1296 * so search backward.
1298 list_for_each_entry_reverse(rq, &array->paa_reqs_array[index],
1300 if (req->rq_deadline >= rq->rq_deadline) {
1301 list_add(&req->rq_timed_list,
1302 &rq->rq_timed_list);
1308 /* Add the request at the head of the list */
1309 if (list_empty(&req->rq_timed_list))
1310 list_add(&req->rq_timed_list, &array->paa_reqs_array[index]);
1312 spin_lock(&req->rq_lock);
1313 req->rq_at_linked = 1;
1314 spin_unlock(&req->rq_lock);
1315 req->rq_at_index = index;
1316 array->paa_reqs_count[index]++;
1318 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1319 array->paa_deadline = req->rq_deadline;
1320 ptlrpc_at_set_timer(svcpt);
1322 spin_unlock(&svcpt->scp_at_lock);
1327 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1329 struct ptlrpc_at_array *array;
1331 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1333 /* NB: must call with hold svcpt::scp_at_lock */
1334 LASSERT(!list_empty(&req->rq_timed_list));
1335 list_del_init(&req->rq_timed_list);
1337 spin_lock(&req->rq_lock);
1338 req->rq_at_linked = 0;
1339 spin_unlock(&req->rq_lock);
1341 array->paa_reqs_count[req->rq_at_index]--;
1346 * Attempt to extend the request deadline by sending an early reply to the
1349 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1351 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1352 struct ptlrpc_request *reqcopy;
1353 struct lustre_msg *reqmsg;
1354 time64_t olddl = req->rq_deadline - ktime_get_real_seconds();
1360 if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_RECONNECT)) {
1361 /* don't send early reply */
1366 * deadline is when the client expects us to reply, margin is the
1367 * difference between clients' and servers' expectations
1369 DEBUG_REQ(D_ADAPTTO, req,
1370 "%ssending early reply (deadline %+llds, margin %+llds) for %d+%d",
1371 AT_OFF ? "AT off - not " : "",
1372 (s64)olddl, (s64)(olddl - at_get(&svcpt->scp_at_estimate)),
1373 at_get(&svcpt->scp_at_estimate), at_extra);
1379 /* below message is checked in replay-ost-single.sh test_9 */
1380 DEBUG_REQ(D_WARNING, req,
1381 "Already past deadline (%+llds), not sending early reply. Consider increasing at_early_margin (%d)?",
1382 (s64)olddl, at_early_margin);
1384 /* Return an error so we're not re-added to the timed list. */
1388 if ((lustre_msghdr_get_flags(req->rq_reqmsg) &
1389 MSGHDR_AT_SUPPORT) == 0) {
1390 DEBUG_REQ(D_INFO, req,
1391 "Wanted to ask client for more time, but no AT support");
1395 if (req->rq_export &&
1396 lustre_msg_get_flags(req->rq_reqmsg) &
1397 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1398 struct obd_device *obd_exp = req->rq_export->exp_obd;
1401 * During recovery, we don't want to send too many early
1402 * replies, but on the other hand we want to make sure the
1403 * client has enough time to resend if the rpc is lost. So
1404 * during the recovery period send at least 4 early replies,
1405 * spacing them every at_extra if we can. at_estimate should
1406 * always equal this fixed value during recovery.
1410 * Don't account request processing time into AT history
1411 * during recovery, it is not service time we need but
1412 * includes also waiting time for recovering clients
1414 newdl = min_t(time64_t, at_extra,
1415 obd_exp->obd_recovery_timeout / 4) +
1416 ktime_get_real_seconds();
1419 * We want to extend the request deadline by at_extra seconds,
1420 * so we set our service estimate to reflect how much time has
1421 * passed since this request arrived plus an additional
1422 * at_extra seconds. The client will calculate the new deadline
1423 * based on this service estimate (plus some additional time to
1424 * account for network latency). See ptlrpc_at_recv_early_reply
1426 at_measured(&svcpt->scp_at_estimate, at_extra +
1427 ktime_get_real_seconds() -
1428 req->rq_arrival_time.tv_sec);
1429 newdl = req->rq_arrival_time.tv_sec +
1430 at_get(&svcpt->scp_at_estimate);
1434 * Check to see if we've actually increased the deadline -
1435 * we may be past adaptive_max
1437 if (req->rq_deadline >= newdl) {
1438 DEBUG_REQ(D_WARNING, req,
1439 "Could not add any time (%lld/%lld), not sending early reply",
1440 (s64)olddl, (s64)(newdl - ktime_get_real_seconds()));
1444 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1445 if (reqcopy == NULL)
1447 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1449 GOTO(out_free, rc = -ENOMEM);
1452 reqcopy->rq_reply_state = NULL;
1453 reqcopy->rq_rep_swab_mask = 0;
1454 reqcopy->rq_pack_bulk = 0;
1455 reqcopy->rq_pack_udesc = 0;
1456 reqcopy->rq_packed_final = 0;
1457 sptlrpc_svc_ctx_addref(reqcopy);
1458 /* We only need the reqmsg for the magic */
1459 reqcopy->rq_reqmsg = reqmsg;
1460 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1463 * tgt_brw_read() and tgt_brw_write() may have decided not to reply.
1464 * Without this check, we would fail the rq_no_reply assertion in
1465 * ptlrpc_send_reply().
1467 if (reqcopy->rq_no_reply)
1468 GOTO(out, rc = -ETIMEDOUT);
1470 LASSERT(atomic_read(&req->rq_refcount));
1471 /* if it is last refcount then early reply isn't needed */
1472 if (atomic_read(&req->rq_refcount) == 1) {
1473 DEBUG_REQ(D_ADAPTTO, reqcopy,
1474 "Normal reply already sent, abort early reply");
1475 GOTO(out, rc = -EINVAL);
1478 /* Connection ref */
1479 reqcopy->rq_export = class_conn2export(
1480 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1481 if (reqcopy->rq_export == NULL)
1482 GOTO(out, rc = -ENODEV);
1485 class_export_rpc_inc(reqcopy->rq_export);
1486 if (reqcopy->rq_export->exp_obd &&
1487 reqcopy->rq_export->exp_obd->obd_fail)
1488 GOTO(out_put, rc = -ENODEV);
1490 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1494 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1497 /* Adjust our own deadline to what we told the client */
1498 req->rq_deadline = newdl;
1499 req->rq_early_count++; /* number sent, server side */
1501 DEBUG_REQ(D_ERROR, req, "Early reply send failed: rc = %d", rc);
1505 * Free the (early) reply state from lustre_pack_reply.
1506 * (ptlrpc_send_reply takes it's own rs ref, so this is safe here)
1508 ptlrpc_req_drop_rs(reqcopy);
1511 class_export_rpc_dec(reqcopy->rq_export);
1512 class_export_put(reqcopy->rq_export);
1514 sptlrpc_svc_ctx_decref(reqcopy);
1515 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1517 ptlrpc_request_cache_free(reqcopy);
1522 * Send early replies to everybody expiring within at_early_margin
1523 * asking for at_extra time
1525 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1527 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1528 struct ptlrpc_request *rq, *n;
1529 struct list_head work_list;
1532 time64_t now = ktime_get_real_seconds();
1534 int first, counter = 0;
1537 spin_lock(&svcpt->scp_at_lock);
1538 if (svcpt->scp_at_check == 0) {
1539 spin_unlock(&svcpt->scp_at_lock);
1542 delay = ktime_ms_delta(ktime_get(), svcpt->scp_at_checktime);
1543 svcpt->scp_at_check = 0;
1545 if (array->paa_count == 0) {
1546 spin_unlock(&svcpt->scp_at_lock);
1550 /* The timer went off, but maybe the nearest rpc already completed. */
1551 first = array->paa_deadline - now;
1552 if (first > at_early_margin) {
1553 /* We've still got plenty of time. Reset the timer. */
1554 ptlrpc_at_set_timer(svcpt);
1555 spin_unlock(&svcpt->scp_at_lock);
1560 * We're close to a timeout, and we don't know how much longer the
1561 * server will take. Send early replies to everyone expiring soon.
1563 INIT_LIST_HEAD(&work_list);
1565 div_u64_rem(array->paa_deadline, array->paa_size, &index);
1566 count = array->paa_count;
1568 count -= array->paa_reqs_count[index];
1569 list_for_each_entry_safe(rq, n,
1570 &array->paa_reqs_array[index],
1572 if (rq->rq_deadline > now + at_early_margin) {
1573 /* update the earliest deadline */
1574 if (deadline == -1 ||
1575 rq->rq_deadline < deadline)
1576 deadline = rq->rq_deadline;
1581 * ptlrpc_server_drop_request() may drop
1582 * refcount to 0 already. Let's check this and
1583 * don't add entry to work_list
1585 if (likely(atomic_inc_not_zero(&rq->rq_refcount))) {
1586 ptlrpc_at_remove_timed(rq);
1587 list_add(&rq->rq_timed_list, &work_list);
1589 ptlrpc_at_remove_timed(rq);
1595 if (++index >= array->paa_size)
1598 array->paa_deadline = deadline;
1599 /* we have a new earliest deadline, restart the timer */
1600 ptlrpc_at_set_timer(svcpt);
1602 spin_unlock(&svcpt->scp_at_lock);
1605 "timeout in %+ds, asking for %d secs on %d early replies\n",
1606 first, at_extra, counter);
1609 * We're already past request deadlines before we even get a
1610 * chance to send early replies
1612 LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
1613 svcpt->scp_service->srv_name);
1614 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%lld\n",
1615 counter, svcpt->scp_nreqs_incoming,
1616 svcpt->scp_nreqs_active,
1617 at_get(&svcpt->scp_at_estimate), delay);
1621 * we took additional refcount so entries can't be deleted from list, no
1624 while (!list_empty(&work_list)) {
1625 rq = list_entry(work_list.next, struct ptlrpc_request,
1627 list_del_init(&rq->rq_timed_list);
1629 if (ptlrpc_at_send_early_reply(rq) == 0)
1630 ptlrpc_at_add_timed(rq);
1632 ptlrpc_server_drop_request(rq);
1635 RETURN(1); /* return "did_something" for liblustre */
1639 * Check if we are already handling earlier incarnation of this request.
1640 * Called under &req->rq_export->exp_rpc_lock locked
1642 static struct ptlrpc_request*
1643 ptlrpc_server_check_resend_in_progress(struct ptlrpc_request *req)
1645 struct ptlrpc_request *tmp = NULL;
1647 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ||
1648 (atomic_read(&req->rq_export->exp_rpc_count) == 0))
1652 * bulk request are aborted upon reconnect, don't try to
1655 if (req->rq_bulk_write || req->rq_bulk_read)
1659 * This list should not be longer than max_requests in
1660 * flights on the client, so it is not all that long.
1661 * Also we only hit this codepath in case of a resent
1662 * request which makes it even more rarely hit
1664 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs,
1666 /* Found duplicate one */
1667 if (tmp->rq_xid == req->rq_xid)
1670 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs,
1672 /* Found duplicate one */
1673 if (tmp->rq_xid == req->rq_xid)
1679 DEBUG_REQ(D_HA, req, "Found duplicate req in processing");
1680 DEBUG_REQ(D_HA, tmp, "Request being processed");
1684 #ifdef HAVE_SERVER_SUPPORT
1685 static void ptlrpc_server_mark_obsolete(struct ptlrpc_request *req)
1687 req->rq_obsolete = 1;
1691 ptlrpc_server_mark_in_progress_obsolete(struct ptlrpc_request *req)
1693 struct ptlrpc_request *tmp = NULL;
1696 if (!tgt_is_increasing_xid_client(req->rq_export) ||
1697 req->rq_export->exp_used_slots == NULL)
1700 tag = lustre_msg_get_tag(req->rq_reqmsg);
1704 if (!test_bit(tag - 1, req->rq_export->exp_used_slots))
1707 /* This list should not be longer than max_requests in
1708 * flights on the client, so it is not all that long.
1709 * Also we only hit this codepath in case of a resent
1710 * request which makes it even more rarely hit */
1711 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs, rq_exp_list) {
1712 if (tag == lustre_msg_get_tag(tmp->rq_reqmsg) &&
1713 req->rq_xid > tmp->rq_xid)
1714 ptlrpc_server_mark_obsolete(tmp);
1717 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs, rq_exp_list) {
1718 if (tag == lustre_msg_get_tag(tmp->rq_reqmsg) &&
1719 req->rq_xid > tmp->rq_xid)
1720 ptlrpc_server_mark_obsolete(tmp);
1726 * Check if a request should be assigned with a high priority.
1728 * \retval < 0: error occurred
1729 * 0: normal RPC request
1730 * +1: high priority request
1732 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1733 struct ptlrpc_request *req)
1738 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL) {
1739 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1746 if (req->rq_export != NULL && req->rq_ops != NULL) {
1748 * Perform request specific check. We should do this
1749 * check before the request is added into exp_hp_rpcs
1750 * list otherwise it may hit swab race at LU-1044.
1752 if (req->rq_ops->hpreq_check != NULL) {
1753 rc = req->rq_ops->hpreq_check(req);
1754 if (rc == -ESTALE) {
1755 req->rq_status = rc;
1759 * can only return error,
1760 * 0 for normal request,
1761 * or 1 for high priority request
1770 /** Remove the request from the export list. */
1771 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1774 if (req->rq_export) {
1776 * refresh lock timeout again so that client has more
1777 * room to send lock cancel RPC.
1779 if (req->rq_ops && req->rq_ops->hpreq_fini)
1780 req->rq_ops->hpreq_fini(req);
1782 ptlrpc_del_exp_list(req);
1787 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1792 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1793 .hpreq_check = ptlrpc_hpreq_check,
1796 /* Hi-Priority RPC check by RPC operation code. */
1797 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1799 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1802 * Check for export to let only reconnects for not yet evicted
1803 * export to become a HP rpc.
1805 if ((req->rq_export != NULL) &&
1806 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1807 req->rq_ops = &ptlrpc_hpreq_common;
1811 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1813 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1814 struct ptlrpc_request *req)
1818 struct ptlrpc_request *orig;
1822 rc = ptlrpc_server_hpreq_init(svcpt, req);
1827 ptlrpc_nrs_req_initialize(svcpt, req, hp);
1829 while (req->rq_export != NULL) {
1830 struct obd_export *exp = req->rq_export;
1833 * do search for duplicated xid and the adding to the list
1836 spin_lock_bh(&exp->exp_rpc_lock);
1837 #ifdef HAVE_SERVER_SUPPORT
1838 ptlrpc_server_mark_in_progress_obsolete(req);
1840 orig = ptlrpc_server_check_resend_in_progress(req);
1841 if (orig && OBD_FAIL_PRECHECK(OBD_FAIL_PTLRPC_RESEND_RACE)) {
1842 spin_unlock_bh(&exp->exp_rpc_lock);
1844 OBD_RACE(OBD_FAIL_PTLRPC_RESEND_RACE);
1845 msleep(4 * MSEC_PER_SEC);
1849 if (orig && likely(atomic_inc_not_zero(&orig->rq_refcount))) {
1852 spin_unlock_bh(&exp->exp_rpc_lock);
1855 * When the client resend request and the server has
1856 * the previous copy of it, we need to update deadlines,
1857 * to be sure that the client and the server have equal
1858 * request deadlines.
1861 spin_lock(&orig->rq_rqbd->rqbd_svcpt->scp_at_lock);
1862 linked = orig->rq_at_linked;
1864 ptlrpc_at_remove_timed(orig);
1865 spin_unlock(&orig->rq_rqbd->rqbd_svcpt->scp_at_lock);
1866 orig->rq_deadline = req->rq_deadline;
1868 ptlrpc_at_add_timed(orig);
1869 ptlrpc_server_drop_request(orig);
1870 ptlrpc_nrs_req_finalize(req);
1872 /* don't mark slot unused for resend in progress */
1873 req->rq_obsolete = 1;
1878 ptlrpc_add_exp_list_nolock(req, exp, hp || req->rq_ops != NULL);
1880 spin_unlock_bh(&exp->exp_rpc_lock);
1885 * the current thread is not the processing thread for this request
1886 * since that, but request is in exp_hp_list and can be find there.
1887 * Remove all relations between request and old thread.
1889 req->rq_svc_thread->t_env->le_ses = NULL;
1890 req->rq_svc_thread = NULL;
1891 req->rq_session.lc_thread = NULL;
1893 ptlrpc_nrs_req_add(svcpt, req, hp);
1899 * Allow to handle high priority request
1900 * User can call it w/o any lock but need to hold
1901 * ptlrpc_service_part::scp_req_lock to get reliable result
1903 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1906 int running = svcpt->scp_nthrs_running;
1908 if (!nrs_svcpt_has_hp(svcpt))
1914 if (ptlrpc_nrs_req_throttling_nolock(svcpt, true))
1917 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1918 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1919 /* leave just 1 thread for normal RPCs */
1920 running = PTLRPC_NTHRS_INIT;
1921 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1925 if (svcpt->scp_nreqs_active >= running - 1)
1928 if (svcpt->scp_nhreqs_active == 0)
1931 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1932 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1935 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1938 return ptlrpc_server_allow_high(svcpt, force) &&
1939 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1943 * Only allow normal priority requests on a service that has a high-priority
1944 * queue if forced (i.e. cleanup), if there are other high priority requests
1945 * already being processed (i.e. those threads can service more high-priority
1946 * requests), or if there are enough idle threads that a later thread can do
1947 * a high priority request.
1948 * User can call it w/o any lock but need to hold
1949 * ptlrpc_service_part::scp_req_lock to get reliable result
1951 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1954 int running = svcpt->scp_nthrs_running;
1956 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1957 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1958 /* leave just 1 thread for normal RPCs */
1959 running = PTLRPC_NTHRS_INIT;
1960 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1967 if (ptlrpc_nrs_req_throttling_nolock(svcpt, false))
1970 if (svcpt->scp_nreqs_active < running - 2)
1973 if (svcpt->scp_nreqs_active >= running - 1)
1976 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1979 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1982 return ptlrpc_server_allow_normal(svcpt, force) &&
1983 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1987 * Returns true if there are requests available in incoming
1988 * request queue for processing and it is allowed to fetch them.
1989 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1990 * to get reliable result
1991 * \see ptlrpc_server_allow_normal
1992 * \see ptlrpc_server_allow high
1995 bool ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt,
1998 return ptlrpc_server_high_pending(svcpt, force) ||
1999 ptlrpc_server_normal_pending(svcpt, force);
2003 * Fetch a request for processing from queue of unprocessed requests.
2004 * Favors high-priority requests.
2005 * Returns a pointer to fetched request.
2007 static struct ptlrpc_request *
2008 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
2010 struct ptlrpc_request *req = NULL;
2014 spin_lock(&svcpt->scp_req_lock);
2016 if (ptlrpc_server_high_pending(svcpt, force)) {
2017 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
2019 svcpt->scp_hreq_count++;
2024 if (ptlrpc_server_normal_pending(svcpt, force)) {
2025 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
2027 svcpt->scp_hreq_count = 0;
2032 spin_unlock(&svcpt->scp_req_lock);
2036 svcpt->scp_nreqs_active++;
2038 svcpt->scp_nhreqs_active++;
2040 spin_unlock(&svcpt->scp_req_lock);
2042 if (likely(req->rq_export))
2043 class_export_rpc_inc(req->rq_export);
2049 * Handle freshly incoming reqs, add to timed early reply list,
2050 * pass on to regular request queue.
2051 * All incoming requests pass through here before getting into
2052 * ptlrpc_server_handle_req later on.
2054 static int ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
2055 struct ptlrpc_thread *thread)
2057 struct ptlrpc_service *svc = svcpt->scp_service;
2058 struct ptlrpc_request *req;
2064 spin_lock(&svcpt->scp_lock);
2065 if (list_empty(&svcpt->scp_req_incoming)) {
2066 spin_unlock(&svcpt->scp_lock);
2070 req = list_entry(svcpt->scp_req_incoming.next,
2071 struct ptlrpc_request, rq_list);
2072 list_del_init(&req->rq_list);
2073 svcpt->scp_nreqs_incoming--;
2075 * Consider this still a "queued" request as far as stats are
2078 spin_unlock(&svcpt->scp_lock);
2080 /* go through security check/transform */
2081 rc = sptlrpc_svc_unwrap_request(req);
2085 case SECSVC_COMPLETE:
2086 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
2095 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
2096 * redo it wouldn't be harmful.
2098 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
2099 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
2101 CERROR("error unpacking request: ptl %d from %s x%llu\n",
2102 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
2108 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
2110 CERROR("error unpacking ptlrpc body: ptl %d from %s x %llu\n",
2111 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
2116 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
2117 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
2118 CERROR("drop incoming rpc opc %u, x%llu\n",
2119 cfs_fail_val, req->rq_xid);
2124 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
2125 CERROR("wrong packet type received (type=%u) from %s\n",
2126 lustre_msg_get_type(req->rq_reqmsg),
2127 libcfs_id2str(req->rq_peer));
2131 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2135 req->rq_bulk_write = 1;
2139 case MGS_CONFIG_READ:
2140 req->rq_bulk_read = 1;
2144 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
2146 req->rq_export = class_conn2export(
2147 lustre_msg_get_handle(req->rq_reqmsg));
2148 if (req->rq_export) {
2149 rc = ptlrpc_check_req(req);
2151 rc = sptlrpc_target_export_check(req->rq_export, req);
2153 DEBUG_REQ(D_ERROR, req,
2154 "DROPPING req with illegal security flavor");
2159 ptlrpc_update_export_timer(req->rq_export, 0);
2162 /* req_in handling should/must be fast */
2163 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
2164 DEBUG_REQ(D_WARNING, req, "Slow req_in handling %llds",
2165 (s64)(ktime_get_real_seconds() -
2166 req->rq_arrival_time.tv_sec));
2168 /* Set rpc server deadline and add it to the timed list */
2169 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
2170 MSGHDR_AT_SUPPORT) ?
2171 /* The max time the client expects us to take */
2172 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
2174 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
2175 if (unlikely(deadline == 0)) {
2176 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
2180 /* Skip early reply */
2181 if (OBD_FAIL_PRECHECK(OBD_FAIL_MDS_RESEND))
2182 req->rq_deadline += obd_timeout;
2184 req->rq_svc_thread = thread;
2185 if (thread != NULL) {
2187 * initialize request session, it is needed for request
2188 * processing by target
2190 rc = lu_context_init(&req->rq_session, LCT_SERVER_SESSION |
2193 CERROR("%s: failure to initialize session: rc = %d\n",
2194 thread->t_name, rc);
2197 req->rq_session.lc_thread = thread;
2198 lu_context_enter(&req->rq_session);
2199 thread->t_env->le_ses = &req->rq_session;
2202 ptlrpc_at_add_timed(req);
2204 /* Move it over to the request processing queue */
2205 rc = ptlrpc_server_request_add(svcpt, req);
2209 wake_up(&svcpt->scp_waitq);
2213 ptlrpc_server_finish_request(svcpt, req);
2219 * Main incoming request handling logic.
2220 * Calls handler function from service to do actual processing.
2222 static int ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
2223 struct ptlrpc_thread *thread)
2225 struct ptlrpc_service *svc = svcpt->scp_service;
2226 struct ptlrpc_request *request;
2236 request = ptlrpc_server_request_get(svcpt, false);
2237 if (request == NULL)
2240 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
2241 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
2242 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
2243 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
2245 if (unlikely(fail_opc)) {
2246 if (request->rq_export && request->rq_ops)
2247 OBD_FAIL_TIMEOUT(fail_opc, 4);
2250 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
2252 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
2253 libcfs_debug_dumplog();
2255 work_start = ktime_get_real();
2256 arrived = timespec64_to_ktime(request->rq_arrival_time);
2257 timediff_usecs = ktime_us_delta(work_start, arrived);
2258 if (likely(svc->srv_stats != NULL)) {
2259 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
2261 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
2262 svcpt->scp_nreqs_incoming);
2263 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
2264 svcpt->scp_nreqs_active);
2265 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
2266 at_get(&svcpt->scp_at_estimate));
2269 if (likely(request->rq_export)) {
2270 if (unlikely(ptlrpc_check_req(request)))
2272 ptlrpc_update_export_timer(request->rq_export,
2273 div_u64(timediff_usecs,
2278 * Discard requests queued for longer than the deadline.
2279 * The deadline is increased if we send an early reply.
2281 if (ktime_get_real_seconds() > request->rq_deadline) {
2282 DEBUG_REQ(D_ERROR, request,
2283 "Dropping timed-out request from %s: deadline %lld/%llds ago",
2284 libcfs_id2str(request->rq_peer),
2285 request->rq_deadline -
2286 request->rq_arrival_time.tv_sec,
2287 ktime_get_real_seconds() - request->rq_deadline);
2292 "Handling RPC req@%p pname:cluuid+ref:pid:xid:nid:opc:job %s:%s+%d:%d:x%llu:%s:%d:%s\n",
2293 request, current_comm(),
2294 (request->rq_export ?
2295 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2296 (request->rq_export ?
2297 refcount_read(&request->rq_export->exp_handle.h_ref) : -99),
2298 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
2299 libcfs_id2str(request->rq_peer),
2300 lustre_msg_get_opc(request->rq_reqmsg),
2301 lustre_msg_get_jobid(request->rq_reqmsg) ?: "");
2303 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
2304 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
2306 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
2308 /* re-assign request and sesson thread to the current one */
2309 request->rq_svc_thread = thread;
2310 if (thread != NULL) {
2311 LASSERT(request->rq_session.lc_thread == NULL);
2312 request->rq_session.lc_thread = thread;
2313 thread->t_env->le_ses = &request->rq_session;
2315 svc->srv_ops.so_req_handler(request);
2317 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
2320 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
2321 DEBUG_REQ(D_WARNING, request,
2322 "Request took longer than estimated (%lld/%llds); client may timeout",
2323 request->rq_deadline -
2324 request->rq_arrival_time.tv_sec,
2325 ktime_get_real_seconds() - request->rq_deadline);
2328 work_end = ktime_get_real();
2329 timediff_usecs = ktime_us_delta(work_end, work_start);
2330 arrived_usecs = ktime_us_delta(work_end, arrived);
2332 "Handled RPC req@%p pname:cluuid+ref:pid:xid:nid:opc:job %s:%s+%d:%d:x%llu:%s:%d:%s Request processed in %lldus (%lldus total) trans %llu rc %d/%d\n",
2333 request, current_comm(),
2334 (request->rq_export ?
2335 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2336 (request->rq_export ?
2337 refcount_read(&request->rq_export->exp_handle.h_ref) : -99),
2338 lustre_msg_get_status(request->rq_reqmsg),
2340 libcfs_id2str(request->rq_peer),
2341 lustre_msg_get_opc(request->rq_reqmsg),
2342 lustre_msg_get_jobid(request->rq_reqmsg) ?: "",
2345 (request->rq_repmsg ?
2346 lustre_msg_get_transno(request->rq_repmsg) :
2347 request->rq_transno),
2349 (request->rq_repmsg ?
2350 lustre_msg_get_status(request->rq_repmsg) : -999));
2351 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2352 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2353 int opc = opcode_offset(op);
2355 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2356 LASSERT(opc < LUSTRE_MAX_OPCODES);
2357 lprocfs_counter_add(svc->srv_stats,
2358 opc + EXTRA_MAX_OPCODES,
2362 if (unlikely(request->rq_early_count)) {
2363 DEBUG_REQ(D_ADAPTTO, request,
2364 "sent %d early replies before finishing in %llds",
2365 request->rq_early_count,
2366 div_u64(arrived_usecs, USEC_PER_SEC));
2369 ptlrpc_server_finish_active_request(svcpt, request);
2375 * An internal function to process a single reply state object.
2377 static int ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2379 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2380 struct ptlrpc_service *svc = svcpt->scp_service;
2381 struct obd_export *exp;
2387 exp = rs->rs_export;
2389 LASSERT(rs->rs_difficult);
2390 LASSERT(rs->rs_scheduled);
2391 LASSERT(list_empty(&rs->rs_list));
2394 * The disk commit callback holds exp_uncommitted_replies_lock while it
2395 * iterates over newly committed replies, removing them from
2396 * exp_uncommitted_replies. It then drops this lock and schedules the
2397 * replies it found for handling here.
2399 * We can avoid contention for exp_uncommitted_replies_lock between the
2400 * HRT threads and further commit callbacks by checking rs_committed
2401 * which is set in the commit callback while it holds both
2402 * rs_lock and exp_uncommitted_reples.
2404 * If we see rs_committed clear, the commit callback _may_ not have
2405 * handled this reply yet and we race with it to grab
2406 * exp_uncommitted_replies_lock before removing the reply from
2407 * exp_uncommitted_replies. Note that if we lose the race and the
2408 * reply has already been removed, list_del_init() is a noop.
2410 * If we see rs_committed set, we know the commit callback is handling,
2411 * or has handled this reply since store reordering might allow us to
2412 * see rs_committed set out of sequence. But since this is done
2413 * holding rs_lock, we can be sure it has all completed once we hold
2414 * rs_lock, which we do right next.
2416 if (!rs->rs_committed) {
2418 * if rs was commited, no need to convert locks, don't check
2419 * rs_committed here because rs may never be added into
2420 * exp_uncommitted_replies and this flag never be set, see
2421 * target_send_reply()
2423 if (rs->rs_convert_lock &&
2424 rs->rs_transno > exp->exp_last_committed) {
2425 struct ldlm_lock *lock;
2426 struct ldlm_lock *ack_locks[RS_MAX_LOCKS] = { NULL };
2428 spin_lock(&rs->rs_lock);
2429 if (rs->rs_convert_lock &&
2430 rs->rs_transno > exp->exp_last_committed) {
2431 nlocks = rs->rs_nlocks;
2432 while (nlocks-- > 0) {
2434 * NB don't assume rs is always handled
2435 * by the same service thread (see
2436 * ptlrpc_hr_select, so REP-ACK hr may
2437 * race with trans commit, while the
2438 * latter will release locks, get locks
2439 * here early to convert to COS mode
2442 lock = ldlm_handle2lock(
2443 &rs->rs_locks[nlocks]);
2445 ack_locks[nlocks] = lock;
2446 rs->rs_modes[nlocks] = LCK_COS;
2448 nlocks = rs->rs_nlocks;
2449 rs->rs_convert_lock = 0;
2451 * clear rs_scheduled so that commit callback
2452 * can schedule again
2454 rs->rs_scheduled = 0;
2455 spin_unlock(&rs->rs_lock);
2457 while (nlocks-- > 0) {
2458 lock = ack_locks[nlocks];
2459 ldlm_lock_mode_downgrade(lock, LCK_COS);
2460 LDLM_LOCK_PUT(lock);
2464 spin_unlock(&rs->rs_lock);
2467 spin_lock(&exp->exp_uncommitted_replies_lock);
2468 list_del_init(&rs->rs_obd_list);
2469 spin_unlock(&exp->exp_uncommitted_replies_lock);
2472 spin_lock(&exp->exp_lock);
2473 /* Noop if removed already */
2474 list_del_init(&rs->rs_exp_list);
2475 spin_unlock(&exp->exp_lock);
2477 spin_lock(&rs->rs_lock);
2479 been_handled = rs->rs_handled;
2482 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2483 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2485 if (nlocks == 0 && !been_handled) {
2487 * If we see this, we should already have seen the warning
2488 * in mds_steal_ack_locks()
2491 "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
2492 rs, rs->rs_xid, rs->rs_transno, rs->rs_opc,
2493 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2496 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2497 spin_unlock(&rs->rs_lock);
2499 if (!been_handled && rs->rs_on_net) {
2500 LNetMDUnlink(rs->rs_md_h);
2501 /* Ignore return code; we're racing with completion */
2504 while (nlocks-- > 0)
2505 ldlm_lock_decref(&rs->rs_locks[nlocks],
2506 rs->rs_modes[nlocks]);
2508 spin_lock(&rs->rs_lock);
2511 rs->rs_scheduled = 0;
2512 rs->rs_convert_lock = 0;
2514 if (!rs->rs_on_net) {
2516 spin_unlock(&rs->rs_lock);
2518 class_export_put(exp);
2519 rs->rs_export = NULL;
2520 ptlrpc_rs_decref(rs);
2521 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2522 svc->srv_is_stopping)
2523 wake_up_all(&svcpt->scp_waitq);
2527 /* still on the net; callback will schedule */
2528 spin_unlock(&rs->rs_lock);
2533 static void ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2535 int avail = svcpt->scp_nrqbds_posted;
2536 int low_water = test_req_buffer_pressure ? 0 :
2537 svcpt->scp_service->srv_nbuf_per_group / 2;
2539 /* NB I'm not locking; just looking. */
2542 * CAVEAT EMPTOR: We might be allocating buffers here because we've
2543 * allowed the request history to grow out of control. We could put a
2544 * sanity check on that here and cull some history if we need the
2548 if (avail <= low_water)
2549 ptlrpc_grow_req_bufs(svcpt, 1);
2551 if (svcpt->scp_service->srv_stats) {
2552 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2553 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2557 static int ptlrpc_retry_rqbds(void *arg)
2559 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2561 svcpt->scp_rqbd_timeout = 0;
2565 static inline int ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2567 return svcpt->scp_nreqs_active <
2568 svcpt->scp_nthrs_running - 1 -
2569 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2573 * allowed to create more threads
2574 * user can call it w/o any lock but need to hold
2575 * ptlrpc_service_part::scp_lock to get reliable result
2577 static inline int ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2579 return svcpt->scp_nthrs_running +
2580 svcpt->scp_nthrs_starting <
2581 svcpt->scp_service->srv_nthrs_cpt_limit;
2585 * too many requests and allowed to create more threads
2587 static inline int ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2589 return !ptlrpc_threads_enough(svcpt) &&
2590 ptlrpc_threads_increasable(svcpt);
2593 static inline int ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2595 return thread_is_stopping(thread) ||
2596 thread->t_svcpt->scp_service->srv_is_stopping;
2599 /* stop the highest numbered thread if there are too many threads running */
2600 static inline bool ptlrpc_thread_should_stop(struct ptlrpc_thread *thread)
2602 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2604 return thread->t_id >= svcpt->scp_service->srv_nthrs_cpt_limit &&
2605 thread->t_id == svcpt->scp_thr_nextid - 1;
2608 static void ptlrpc_stop_thread(struct ptlrpc_thread *thread)
2610 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2611 thread->t_svcpt->scp_service->srv_thread_name, thread->t_id);
2612 thread_add_flags(thread, SVC_STOPPING);
2615 static inline void ptlrpc_thread_stop(struct ptlrpc_thread *thread)
2617 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2619 spin_lock(&svcpt->scp_lock);
2620 if (ptlrpc_thread_should_stop(thread)) {
2621 ptlrpc_stop_thread(thread);
2622 svcpt->scp_thr_nextid--;
2624 spin_unlock(&svcpt->scp_lock);
2627 static inline int ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2629 return !list_empty(&svcpt->scp_rqbd_idle) &&
2630 svcpt->scp_rqbd_timeout == 0;
2634 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2636 return svcpt->scp_at_check;
2640 * If a thread runs too long or spends to much time on a single request,
2641 * we want to know about it, so we set up a delayed work item as a watchdog.
2642 * If it fires, we display a stack trace of the delayed thread,
2643 * providing we aren't rate-limited
2645 * Watchdog stack traces are limited to 3 per 'libcfs_watchdog_ratelimit'
2648 static struct ratelimit_state watchdog_limit;
2650 static void ptlrpc_watchdog_fire(struct work_struct *w)
2652 struct ptlrpc_thread *thread = container_of(w, struct ptlrpc_thread,
2654 u64 ms_lapse = ktime_ms_delta(ktime_get(), thread->t_touched);
2655 u32 ms_frac = do_div(ms_lapse, MSEC_PER_SEC);
2657 /* ___ratelimit() returns true if the action is NOT ratelimited */
2658 if (__ratelimit(&watchdog_limit)) {
2659 /* below message is checked in sanity-quota.sh test_6,18 */
2660 LCONSOLE_WARN("%s: service thread pid %u was inactive for %llu.%03u seconds. The thread might be hung, or it might only be slow and will resume later. Dumping the stack trace for debugging purposes:\n",
2661 thread->t_task->comm, thread->t_task->pid,
2664 libcfs_debug_dumpstack(thread->t_task);
2666 /* below message is checked in sanity-quota.sh test_6,18 */
2667 LCONSOLE_WARN("%s: service thread pid %u was inactive for %llu.%03u seconds. Watchdog stack traces are limited to 3 per %u seconds, skipping this one.\n",
2668 thread->t_task->comm, thread->t_task->pid,
2669 ms_lapse, ms_frac, libcfs_watchdog_ratelimit);
2673 static void ptlrpc_watchdog_init(struct delayed_work *work, time_t time)
2675 INIT_DELAYED_WORK(work, ptlrpc_watchdog_fire);
2676 schedule_delayed_work(work, cfs_time_seconds(time));
2679 static void ptlrpc_watchdog_disable(struct delayed_work *work)
2681 cancel_delayed_work_sync(work);
2684 static void ptlrpc_watchdog_touch(struct delayed_work *work, time_t time)
2686 struct ptlrpc_thread *thread = container_of(&work->work,
2687 struct ptlrpc_thread,
2689 thread->t_touched = ktime_get();
2690 mod_delayed_work(system_wq, work, cfs_time_seconds(time));
2694 * requests wait on preprocessing
2695 * user can call it w/o any lock but need to hold
2696 * ptlrpc_service_part::scp_lock to get reliable result
2699 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2701 return !list_empty(&svcpt->scp_req_incoming);
2704 static __attribute__((__noinline__)) int
2705 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2706 struct ptlrpc_thread *thread)
2708 /* Don't exit while there are replies to be handled */
2709 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2710 ptlrpc_retry_rqbds, svcpt);
2712 ptlrpc_watchdog_disable(&thread->t_watchdog);
2716 l_wait_event_exclusive_head(svcpt->scp_waitq,
2717 ptlrpc_thread_stopping(thread) ||
2718 ptlrpc_server_request_incoming(svcpt) ||
2719 ptlrpc_server_request_pending(svcpt, false) ||
2720 ptlrpc_rqbd_pending(svcpt) ||
2721 ptlrpc_at_check(svcpt), &lwi);
2723 if (ptlrpc_thread_stopping(thread))
2726 ptlrpc_watchdog_touch(&thread->t_watchdog,
2727 ptlrpc_server_get_timeout(svcpt));
2732 * Main thread body for service threads.
2733 * Waits in a loop waiting for new requests to process to appear.
2734 * Every time an incoming requests is added to its queue, a waitq
2735 * is woken up and one of the threads will handle it.
2737 static int ptlrpc_main(void *arg)
2739 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2740 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2741 struct ptlrpc_service *svc = svcpt->scp_service;
2742 struct ptlrpc_reply_state *rs;
2743 struct group_info *ginfo = NULL;
2745 int counter = 0, rc = 0;
2749 thread->t_task = current;
2750 thread->t_pid = current_pid();
2751 unshare_fs_struct();
2753 if (svc->srv_cpt_bind) {
2754 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2756 CWARN("%s: failed to bind %s on CPT %d\n",
2757 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2761 ginfo = groups_alloc(0);
2763 GOTO(out, rc = -ENOMEM);
2765 set_current_groups(ginfo);
2766 put_group_info(ginfo);
2768 if (svc->srv_ops.so_thr_init != NULL) {
2769 rc = svc->srv_ops.so_thr_init(thread);
2776 GOTO(out_srv_fini, rc = -ENOMEM);
2777 rc = lu_env_add(env);
2781 rc = lu_context_init(&env->le_ctx,
2782 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2784 GOTO(out_env_remove, rc);
2786 thread->t_env = env;
2787 env->le_ctx.lc_thread = thread;
2788 env->le_ctx.lc_cookie = 0x6;
2790 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2791 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2795 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2796 svc->srv_name, svcpt->scp_cpt, rc);
2797 GOTO(out_ctx_fini, rc);
2800 /* Alloc reply state structure for this one */
2801 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2803 GOTO(out_ctx_fini, rc = -ENOMEM);
2805 spin_lock(&svcpt->scp_lock);
2807 LASSERT(thread_is_starting(thread));
2808 thread_clear_flags(thread, SVC_STARTING);
2810 LASSERT(svcpt->scp_nthrs_starting == 1);
2811 svcpt->scp_nthrs_starting--;
2814 * SVC_STOPPING may already be set here if someone else is trying
2815 * to stop the service while this new thread has been dynamically
2816 * forked. We still set SVC_RUNNING to let our creator know that
2817 * we are now running, however we will exit as soon as possible
2819 thread_add_flags(thread, SVC_RUNNING);
2820 svcpt->scp_nthrs_running++;
2821 spin_unlock(&svcpt->scp_lock);
2823 /* wake up our creator in case he's still waiting. */
2824 wake_up(&thread->t_ctl_waitq);
2826 thread->t_touched = ktime_get();
2827 ptlrpc_watchdog_init(&thread->t_watchdog,
2828 ptlrpc_server_get_timeout(svcpt));
2830 spin_lock(&svcpt->scp_rep_lock);
2831 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2832 wake_up(&svcpt->scp_rep_waitq);
2833 spin_unlock(&svcpt->scp_rep_lock);
2835 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2836 svcpt->scp_nthrs_running);
2838 /* XXX maintain a list of all managed devices: insert here */
2839 while (!ptlrpc_thread_stopping(thread)) {
2840 if (ptlrpc_wait_event(svcpt, thread))
2843 ptlrpc_check_rqbd_pool(svcpt);
2845 if (ptlrpc_threads_need_create(svcpt)) {
2846 /* Ignore return code - we tried... */
2847 ptlrpc_start_thread(svcpt, 0);
2850 /* reset le_ses to initial state */
2852 /* Refill the context before execution to make sure
2853 * all thread keys are allocated */
2855 /* Process all incoming reqs before handling any */
2856 if (ptlrpc_server_request_incoming(svcpt)) {
2857 lu_context_enter(&env->le_ctx);
2858 ptlrpc_server_handle_req_in(svcpt, thread);
2859 lu_context_exit(&env->le_ctx);
2861 /* but limit ourselves in case of flood */
2862 if (counter++ < 100)
2867 if (ptlrpc_at_check(svcpt))
2868 ptlrpc_at_check_timed(svcpt);
2870 if (ptlrpc_server_request_pending(svcpt, false)) {
2871 lu_context_enter(&env->le_ctx);
2872 ptlrpc_server_handle_request(svcpt, thread);
2873 lu_context_exit(&env->le_ctx);
2876 if (ptlrpc_rqbd_pending(svcpt) &&
2877 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2879 * I just failed to repost request buffers.
2880 * Wait for a timeout (unless something else
2881 * happens) before I try again
2883 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2884 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2885 svcpt->scp_nrqbds_posted);
2888 * If the number of threads has been tuned downward and this
2889 * thread should be stopped, then stop in reverse order so the
2890 * the threads always have contiguous thread index values.
2892 if (unlikely(ptlrpc_thread_should_stop(thread)))
2893 ptlrpc_thread_stop(thread);
2896 ptlrpc_watchdog_disable(&thread->t_watchdog);
2899 lu_context_fini(&env->le_ctx);
2905 /* deconstruct service thread state created by ptlrpc_start_thread() */
2906 if (svc->srv_ops.so_thr_done != NULL)
2907 svc->srv_ops.so_thr_done(thread);
2909 CDEBUG(D_RPCTRACE, "%s: service thread [%p:%u] %d exiting: rc = %d\n",
2910 thread->t_name, thread, thread->t_pid, thread->t_id, rc);
2911 spin_lock(&svcpt->scp_lock);
2912 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2913 svcpt->scp_nthrs_starting--;
2915 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2916 /* must know immediately */
2917 svcpt->scp_nthrs_running--;
2921 thread_add_flags(thread, SVC_STOPPED);
2923 wake_up(&thread->t_ctl_waitq);
2924 spin_unlock(&svcpt->scp_lock);
2929 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2930 struct list_head *replies)
2934 spin_lock(&hrt->hrt_lock);
2936 list_splice_init(&hrt->hrt_queue, replies);
2937 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2939 spin_unlock(&hrt->hrt_lock);
2944 * Main body of "handle reply" function.
2945 * It processes acked reply states
2947 static int ptlrpc_hr_main(void *arg)
2949 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2950 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2951 struct list_head replies;
2959 INIT_LIST_HEAD(&replies);
2960 unshare_fs_struct();
2962 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2964 char threadname[20];
2966 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2967 hrp->hrp_cpt, hrt->hrt_id);
2968 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2969 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2972 rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD |
2973 LCT_REMEMBER | LCT_NOREF);
2977 rc = lu_env_add(env);
2979 GOTO(out_ctx_fini, rc);
2981 atomic_inc(&hrp->hrp_nstarted);
2982 wake_up(&ptlrpc_hr.hr_waitq);
2984 while (!ptlrpc_hr.hr_stopping) {
2985 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2987 while (!list_empty(&replies)) {
2988 struct ptlrpc_reply_state *rs;
2990 rs = list_entry(replies.prev,
2991 struct ptlrpc_reply_state,
2993 list_del_init(&rs->rs_list);
2994 /* refill keys if needed */
2996 lu_context_enter(&env->le_ctx);
2997 ptlrpc_handle_rs(rs);
2998 lu_context_exit(&env->le_ctx);
3002 atomic_inc(&hrp->hrp_nstopped);
3003 wake_up(&ptlrpc_hr.hr_waitq);
3007 lu_context_fini(&env->le_ctx);
3013 static void ptlrpc_stop_hr_threads(void)
3015 struct ptlrpc_hr_partition *hrp;
3019 ptlrpc_hr.hr_stopping = 1;
3021 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
3022 if (hrp->hrp_thrs == NULL)
3023 continue; /* uninitialized */
3024 for (j = 0; j < hrp->hrp_nthrs; j++)
3025 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
3028 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
3029 if (hrp->hrp_thrs == NULL)
3030 continue; /* uninitialized */
3031 wait_event(ptlrpc_hr.hr_waitq,
3032 atomic_read(&hrp->hrp_nstopped) ==
3033 atomic_read(&hrp->hrp_nstarted));
3037 static int ptlrpc_start_hr_threads(void)
3039 struct ptlrpc_hr_partition *hrp;
3045 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
3048 for (j = 0; j < hrp->hrp_nthrs; j++) {
3049 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
3050 struct task_struct *task;
3052 task = kthread_run(ptlrpc_hr_main,
3054 "ptlrpc_hr%02d_%03d",
3063 wait_event(ptlrpc_hr.hr_waitq,
3064 atomic_read(&hrp->hrp_nstarted) == j);
3067 CERROR("cannot start reply handler thread %d:%d: rc = %d\n",
3069 ptlrpc_stop_hr_threads();
3077 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
3079 struct ptlrpc_thread *thread;
3080 struct list_head zombie;
3084 CDEBUG(D_INFO, "Stopping threads for service %s\n",
3085 svcpt->scp_service->srv_name);
3087 INIT_LIST_HEAD(&zombie);
3088 spin_lock(&svcpt->scp_lock);
3089 /* let the thread know that we would like it to stop asap */
3090 list_for_each_entry(thread, &svcpt->scp_threads, t_link)
3091 ptlrpc_stop_thread(thread);
3093 wake_up_all(&svcpt->scp_waitq);
3095 while (!list_empty(&svcpt->scp_threads)) {
3096 thread = list_entry(svcpt->scp_threads.next,
3097 struct ptlrpc_thread, t_link);
3098 if (thread_is_stopped(thread)) {
3099 list_move(&thread->t_link, &zombie);
3102 spin_unlock(&svcpt->scp_lock);
3104 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
3105 svcpt->scp_service->srv_thread_name, thread->t_id);
3106 wait_event_idle(thread->t_ctl_waitq,
3107 thread_is_stopped(thread));
3109 spin_lock(&svcpt->scp_lock);
3112 spin_unlock(&svcpt->scp_lock);
3114 while (!list_empty(&zombie)) {
3115 thread = list_entry(zombie.next,
3116 struct ptlrpc_thread, t_link);
3117 list_del(&thread->t_link);
3118 OBD_FREE_PTR(thread);
3124 * Stops all threads of a particular service \a svc
3126 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
3128 struct ptlrpc_service_part *svcpt;
3133 ptlrpc_service_for_each_part(svcpt, i, svc) {
3134 if (svcpt->scp_service != NULL)
3135 ptlrpc_svcpt_stop_threads(svcpt);
3141 int ptlrpc_start_threads(struct ptlrpc_service *svc)
3149 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
3150 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
3152 for (i = 0; i < svc->srv_ncpts; i++) {
3153 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
3154 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
3160 /* We have enough threads, don't start more. b=15759 */
3167 CERROR("cannot start %s thread #%d_%d: rc %d\n",
3168 svc->srv_thread_name, i, j, rc);
3169 ptlrpc_stop_all_threads(svc);
3173 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
3175 struct ptlrpc_thread *thread;
3176 struct ptlrpc_service *svc;
3177 struct task_struct *task;
3182 LASSERT(svcpt != NULL);
3184 svc = svcpt->scp_service;
3186 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
3187 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
3188 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
3191 if (unlikely(svc->srv_is_stopping))
3194 if (!ptlrpc_threads_increasable(svcpt) ||
3195 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
3196 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
3199 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
3202 init_waitqueue_head(&thread->t_ctl_waitq);
3204 spin_lock(&svcpt->scp_lock);
3205 if (!ptlrpc_threads_increasable(svcpt)) {
3206 spin_unlock(&svcpt->scp_lock);
3207 OBD_FREE_PTR(thread);
3211 if (svcpt->scp_nthrs_starting != 0) {
3213 * serialize starting because some modules (obdfilter)
3214 * might require unique and contiguous t_id
3216 LASSERT(svcpt->scp_nthrs_starting == 1);
3217 spin_unlock(&svcpt->scp_lock);
3218 OBD_FREE_PTR(thread);
3220 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
3221 svc->srv_thread_name, svcpt->scp_thr_nextid);
3226 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
3227 svc->srv_thread_name, svcpt->scp_thr_nextid);
3231 svcpt->scp_nthrs_starting++;
3232 thread->t_id = svcpt->scp_thr_nextid++;
3233 thread_add_flags(thread, SVC_STARTING);
3234 thread->t_svcpt = svcpt;
3236 list_add(&thread->t_link, &svcpt->scp_threads);
3237 spin_unlock(&svcpt->scp_lock);
3239 if (svcpt->scp_cpt >= 0) {
3240 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s%02d_%03d",
3241 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
3243 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s_%04d",
3244 svc->srv_thread_name, thread->t_id);
3247 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
3248 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
3251 CERROR("cannot start thread '%s': rc = %d\n",
3252 thread->t_name, rc);
3253 spin_lock(&svcpt->scp_lock);
3254 --svcpt->scp_nthrs_starting;
3255 if (thread_is_stopping(thread)) {
3257 * this ptlrpc_thread is being hanled
3258 * by ptlrpc_svcpt_stop_threads now
3260 thread_add_flags(thread, SVC_STOPPED);
3261 wake_up(&thread->t_ctl_waitq);
3262 spin_unlock(&svcpt->scp_lock);
3264 list_del(&thread->t_link);
3265 spin_unlock(&svcpt->scp_lock);
3266 OBD_FREE_PTR(thread);
3274 wait_event_idle(thread->t_ctl_waitq,
3275 thread_is_running(thread) || thread_is_stopped(thread));
3277 rc = thread_is_stopped(thread) ? thread->t_id : 0;
3281 int ptlrpc_hr_init(void)
3283 struct ptlrpc_hr_partition *hrp;
3284 struct ptlrpc_hr_thread *hrt;
3292 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
3293 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
3295 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
3297 if (ptlrpc_hr.hr_partitions == NULL)
3300 ratelimit_state_init(&watchdog_limit,
3301 cfs_time_seconds(libcfs_watchdog_ratelimit), 3);
3303 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
3306 weight = cpumask_weight(topology_sibling_cpumask(smp_processor_id()));
3309 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3312 atomic_set(&hrp->hrp_nstarted, 0);
3313 atomic_set(&hrp->hrp_nstopped, 0);
3315 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, cpt);
3316 hrp->hrp_nthrs /= weight;
3317 if (hrp->hrp_nthrs == 0)
3320 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, cpt,
3321 hrp->hrp_nthrs * sizeof(*hrt));
3322 if (hrp->hrp_thrs == NULL)
3323 GOTO(out, rc = -ENOMEM);
3325 for (i = 0; i < hrp->hrp_nthrs; i++) {
3326 hrt = &hrp->hrp_thrs[i];
3329 hrt->hrt_partition = hrp;
3330 init_waitqueue_head(&hrt->hrt_waitq);
3331 spin_lock_init(&hrt->hrt_lock);
3332 INIT_LIST_HEAD(&hrt->hrt_queue);
3336 rc = ptlrpc_start_hr_threads();
3343 void ptlrpc_hr_fini(void)
3345 struct ptlrpc_hr_partition *hrp;
3348 if (ptlrpc_hr.hr_partitions == NULL)
3351 ptlrpc_stop_hr_threads();
3353 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3354 if (hrp->hrp_thrs != NULL) {
3355 OBD_FREE(hrp->hrp_thrs,
3356 hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
3360 cfs_percpt_free(ptlrpc_hr.hr_partitions);
3361 ptlrpc_hr.hr_partitions = NULL;
3366 * Wait until all already scheduled replies are processed.
3368 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
3371 if (wait_event_idle_timeout(
3373 atomic_read(&svcpt->scp_nreps_difficult) == 0,
3374 cfs_time_seconds(10)) > 0)
3376 CWARN("Unexpectedly long timeout %s %p\n",
3377 svcpt->scp_service->srv_name, svcpt->scp_service);
3382 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
3384 struct ptlrpc_service_part *svcpt;
3387 /* early disarm AT timer... */
3388 ptlrpc_service_for_each_part(svcpt, i, svc) {
3389 if (svcpt->scp_service != NULL)
3390 del_timer(&svcpt->scp_at_timer);
3395 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
3397 struct ptlrpc_service_part *svcpt;
3398 struct ptlrpc_request_buffer_desc *rqbd;
3399 struct l_wait_info lwi;
3404 * All history will be culled when the next request buffer is
3405 * freed in ptlrpc_service_purge_all()
3407 svc->srv_hist_nrqbds_cpt_max = 0;
3409 rc = LNetClearLazyPortal(svc->srv_req_portal);
3412 ptlrpc_service_for_each_part(svcpt, i, svc) {
3413 if (svcpt->scp_service == NULL)
3417 * Unlink all the request buffers. This forces a 'final'
3418 * event with its 'unlink' flag set for each posted rqbd
3420 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
3422 rc = LNetMDUnlink(rqbd->rqbd_md_h);
3423 LASSERT(rc == 0 || rc == -ENOENT);
3427 ptlrpc_service_for_each_part(svcpt, i, svc) {
3428 if (svcpt->scp_service == NULL)
3432 * Wait for the network to release any buffers
3433 * it's currently filling
3435 spin_lock(&svcpt->scp_lock);
3436 while (svcpt->scp_nrqbds_posted != 0) {
3437 spin_unlock(&svcpt->scp_lock);
3439 * Network access will complete in finite time but
3440 * the HUGE timeout lets us CWARN for visibility
3443 lwi = LWI_TIMEOUT_INTERVAL(
3444 cfs_time_seconds(LONG_UNLINK),
3445 cfs_time_seconds(1), NULL, NULL);
3446 rc = l_wait_event(svcpt->scp_waitq,
3447 svcpt->scp_nrqbds_posted == 0, &lwi);
3448 if (rc == -ETIMEDOUT) {
3449 CWARN("Service %s waiting for request buffers\n",
3450 svcpt->scp_service->srv_name);
3452 spin_lock(&svcpt->scp_lock);
3454 spin_unlock(&svcpt->scp_lock);
3459 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
3461 struct ptlrpc_service_part *svcpt;
3462 struct ptlrpc_request_buffer_desc *rqbd;
3463 struct ptlrpc_request *req;
3464 struct ptlrpc_reply_state *rs;
3467 ptlrpc_service_for_each_part(svcpt, i, svc) {
3468 if (svcpt->scp_service == NULL)
3471 spin_lock(&svcpt->scp_rep_lock);
3472 while (!list_empty(&svcpt->scp_rep_active)) {
3473 rs = list_entry(svcpt->scp_rep_active.next,
3474 struct ptlrpc_reply_state, rs_list);
3475 spin_lock(&rs->rs_lock);
3476 ptlrpc_schedule_difficult_reply(rs);
3477 spin_unlock(&rs->rs_lock);
3479 spin_unlock(&svcpt->scp_rep_lock);
3482 * purge the request queue. NB No new replies (rqbds
3483 * all unlinked) and no service threads, so I'm the only
3484 * thread noodling the request queue now
3486 while (!list_empty(&svcpt->scp_req_incoming)) {
3487 req = list_entry(svcpt->scp_req_incoming.next,
3488 struct ptlrpc_request, rq_list);
3490 list_del(&req->rq_list);
3491 svcpt->scp_nreqs_incoming--;
3492 ptlrpc_server_finish_request(svcpt, req);
3495 while (ptlrpc_server_request_pending(svcpt, true)) {
3496 req = ptlrpc_server_request_get(svcpt, true);
3497 ptlrpc_server_finish_active_request(svcpt, req);
3500 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
3501 LASSERT(svcpt->scp_nreqs_incoming == 0);
3502 LASSERT(svcpt->scp_nreqs_active == 0);
3504 * history should have been culled by
3505 * ptlrpc_server_finish_request
3507 LASSERT(svcpt->scp_hist_nrqbds == 0);
3510 * Now free all the request buffers since nothing
3511 * references them any more...
3514 while (!list_empty(&svcpt->scp_rqbd_idle)) {
3515 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
3516 struct ptlrpc_request_buffer_desc,
3518 ptlrpc_free_rqbd(rqbd);
3520 ptlrpc_wait_replies(svcpt);
3522 while (!list_empty(&svcpt->scp_rep_idle)) {
3523 rs = list_entry(svcpt->scp_rep_idle.next,
3524 struct ptlrpc_reply_state,
3526 list_del(&rs->rs_list);
3527 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
3533 ptlrpc_service_free(struct ptlrpc_service *svc)
3535 struct ptlrpc_service_part *svcpt;
3536 struct ptlrpc_at_array *array;
3539 ptlrpc_service_for_each_part(svcpt, i, svc) {
3540 if (svcpt->scp_service == NULL)
3543 /* In case somebody rearmed this in the meantime */
3544 del_timer(&svcpt->scp_at_timer);
3545 array = &svcpt->scp_at_array;
3547 if (array->paa_reqs_array != NULL) {
3548 OBD_FREE(array->paa_reqs_array,
3549 sizeof(struct list_head) * array->paa_size);
3550 array->paa_reqs_array = NULL;
3553 if (array->paa_reqs_count != NULL) {
3554 OBD_FREE(array->paa_reqs_count,
3555 sizeof(__u32) * array->paa_size);
3556 array->paa_reqs_count = NULL;
3560 ptlrpc_service_for_each_part(svcpt, i, svc)
3561 OBD_FREE_PTR(svcpt);
3563 if (svc->srv_cpts != NULL)
3564 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3566 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3567 srv_parts[svc->srv_ncpts]));
3570 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3574 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3576 service->srv_is_stopping = 1;
3578 mutex_lock(&ptlrpc_all_services_mutex);
3579 list_del_init(&service->srv_list);
3580 mutex_unlock(&ptlrpc_all_services_mutex);
3582 ptlrpc_service_del_atimer(service);
3583 ptlrpc_stop_all_threads(service);
3585 ptlrpc_service_unlink_rqbd(service);
3586 ptlrpc_service_purge_all(service);
3587 ptlrpc_service_nrs_cleanup(service);
3589 ptlrpc_lprocfs_unregister_service(service);
3590 ptlrpc_sysfs_unregister_service(service);
3592 ptlrpc_service_free(service);
3596 EXPORT_SYMBOL(ptlrpc_unregister_service);
3599 * Returns 0 if the service is healthy.
3601 * Right now, it just checks to make sure that requests aren't languishing
3602 * in the queue. We'll use this health check to govern whether a node needs
3603 * to be shot, so it's intentionally non-aggressive.
3605 static int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3607 struct ptlrpc_request *request = NULL;
3608 struct timespec64 right_now;
3609 struct timespec64 timediff;
3611 ktime_get_real_ts64(&right_now);
3613 spin_lock(&svcpt->scp_req_lock);
3614 /* How long has the next entry been waiting? */
3615 if (ptlrpc_server_high_pending(svcpt, true))
3616 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3617 else if (ptlrpc_server_normal_pending(svcpt, true))
3618 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3620 if (request == NULL) {
3621 spin_unlock(&svcpt->scp_req_lock);
3625 timediff = timespec64_sub(right_now, request->rq_arrival_time);
3626 spin_unlock(&svcpt->scp_req_lock);
3628 if ((timediff.tv_sec) >
3629 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3630 CERROR("%s: unhealthy - request has been waiting %llds\n",
3631 svcpt->scp_service->srv_name, (s64)timediff.tv_sec);
3639 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3641 struct ptlrpc_service_part *svcpt;
3647 ptlrpc_service_for_each_part(svcpt, i, svc) {
3648 int rc = ptlrpc_svcpt_health_check(svcpt);
3655 EXPORT_SYMBOL(ptlrpc_service_health_check);