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 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_tab 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_PTR_ARRAY(array->paa_reqs_count, size);
688 array->paa_reqs_count = NULL;
691 if (array->paa_reqs_array != NULL) {
692 OBD_FREE_PTR_ARRAY(array->paa_reqs_array, array->paa_size);
693 array->paa_reqs_array = NULL;
700 * Initialize service on a given portal.
701 * This includes starting serving threads , allocating and posting rqbds and
704 struct ptlrpc_service *ptlrpc_register_service(struct ptlrpc_service_conf *conf,
706 struct dentry *debugfs_entry)
708 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
709 struct ptlrpc_service *service;
710 struct ptlrpc_service_part *svcpt;
711 struct cfs_cpt_table *cptable;
720 LASSERT(conf->psc_buf.bc_nbufs > 0);
721 LASSERT(conf->psc_buf.bc_buf_size >=
722 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
723 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
725 cptable = cconf->cc_cptable;
727 cptable = cfs_cpt_tab;
729 if (conf->psc_thr.tc_cpu_bind > 1) {
730 CERROR("%s: Invalid cpu bind value %d, only 1 or 0 allowed\n",
731 conf->psc_name, conf->psc_thr.tc_cpu_bind);
732 RETURN(ERR_PTR(-EINVAL));
735 if (!cconf->cc_affinity) {
738 ncpts = cfs_cpt_number(cptable);
739 if (cconf->cc_pattern != NULL) {
740 struct cfs_expr_list *el;
742 rc = cfs_expr_list_parse(cconf->cc_pattern,
743 strlen(cconf->cc_pattern),
746 CERROR("%s: invalid CPT pattern string: %s",
747 conf->psc_name, cconf->cc_pattern);
748 RETURN(ERR_PTR(-EINVAL));
751 rc = cfs_expr_list_values(el, ncpts, &cpts);
752 cfs_expr_list_free(el);
754 CERROR("%s: failed to parse CPT array %s: %d\n",
755 conf->psc_name, cconf->cc_pattern, rc);
757 OBD_FREE_PTR_ARRAY(cpts, ncpts);
758 RETURN(ERR_PTR(rc < 0 ? rc : -EINVAL));
764 OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
765 if (service == NULL) {
767 OBD_FREE_PTR_ARRAY(cpts, ncpts);
768 RETURN(ERR_PTR(-ENOMEM));
771 service->srv_cptable = cptable;
772 service->srv_cpts = cpts;
773 service->srv_ncpts = ncpts;
774 service->srv_cpt_bind = conf->psc_thr.tc_cpu_bind;
776 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
777 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
778 service->srv_cpt_bits++;
781 spin_lock_init(&service->srv_lock);
782 service->srv_name = conf->psc_name;
783 service->srv_watchdog_factor = conf->psc_watchdog_factor;
784 INIT_LIST_HEAD(&service->srv_list); /* for safty of cleanup */
786 /* buffer configuration */
787 service->srv_nbuf_per_group = test_req_buffer_pressure ?
788 1 : conf->psc_buf.bc_nbufs;
789 /* do not limit max number of rqbds by default */
790 service->srv_nrqbds_max = 0;
792 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
794 service->srv_buf_size = conf->psc_buf.bc_buf_size;
795 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
796 service->srv_req_portal = conf->psc_buf.bc_req_portal;
798 /* With slab/alloc_pages buffer size will be rounded up to 2^n */
799 if (service->srv_buf_size & (service->srv_buf_size - 1)) {
800 int round = size_roundup_power2(service->srv_buf_size);
802 service->srv_buf_size = round;
805 /* Increase max reply size to next power of two */
806 service->srv_max_reply_size = 1;
807 while (service->srv_max_reply_size <
808 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
809 service->srv_max_reply_size <<= 1;
811 service->srv_thread_name = conf->psc_thr.tc_thr_name;
812 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
813 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
814 service->srv_ops = conf->psc_ops;
816 for (i = 0; i < ncpts; i++) {
817 if (!cconf->cc_affinity)
820 cpt = cpts != NULL ? cpts[i] : i;
822 OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
824 GOTO(failed, rc = -ENOMEM);
826 service->srv_parts[i] = svcpt;
827 rc = ptlrpc_service_part_init(service, svcpt, cpt);
832 ptlrpc_server_nthreads_check(service, conf);
834 rc = LNetSetLazyPortal(service->srv_req_portal);
837 mutex_lock(&ptlrpc_all_services_mutex);
838 list_add(&service->srv_list, &ptlrpc_all_services);
839 mutex_unlock(&ptlrpc_all_services_mutex);
842 rc = ptlrpc_sysfs_register_service(parent, service);
847 if (debugfs_entry != NULL)
848 ptlrpc_ldebugfs_register_service(debugfs_entry, service);
850 rc = ptlrpc_service_nrs_setup(service);
854 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
855 service->srv_name, service->srv_req_portal);
857 rc = ptlrpc_start_threads(service);
859 CERROR("Failed to start threads for service %s: %d\n",
860 service->srv_name, rc);
866 ptlrpc_unregister_service(service);
869 EXPORT_SYMBOL(ptlrpc_register_service);
872 * to actually free the request, must be called without holding svc_lock.
873 * note it's caller's responsibility to unlink req->rq_list.
875 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
877 LASSERT(atomic_read(&req->rq_refcount) == 0);
878 LASSERT(list_empty(&req->rq_timed_list));
881 * DEBUG_REQ() assumes the reply state of a request with a valid
882 * ref will not be destroyed until that reference is dropped.
884 ptlrpc_req_drop_rs(req);
886 sptlrpc_svc_ctx_decref(req);
888 if (req != &req->rq_rqbd->rqbd_req) {
890 * NB request buffers use an embedded
891 * req if the incoming req unlinked the
892 * MD; this isn't one of them!
894 ptlrpc_request_cache_free(req);
899 * drop a reference count of the request. if it reaches 0, we either
900 * put it into history list, or free it immediately.
902 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
904 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
905 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
906 struct ptlrpc_service *svc = svcpt->scp_service;
908 struct list_head *tmp;
909 struct list_head *nxt;
911 if (!atomic_dec_and_test(&req->rq_refcount))
914 if (req->rq_session.lc_state == LCS_ENTERED) {
915 lu_context_exit(&req->rq_session);
916 lu_context_fini(&req->rq_session);
919 if (req->rq_at_linked) {
920 spin_lock(&svcpt->scp_at_lock);
922 * recheck with lock, in case it's unlinked by
923 * ptlrpc_at_check_timed()
925 if (likely(req->rq_at_linked))
926 ptlrpc_at_remove_timed(req);
927 spin_unlock(&svcpt->scp_at_lock);
930 LASSERT(list_empty(&req->rq_timed_list));
932 /* finalize request */
933 if (req->rq_export) {
934 class_export_put(req->rq_export);
935 req->rq_export = NULL;
938 spin_lock(&svcpt->scp_lock);
940 list_add(&req->rq_list, &rqbd->rqbd_reqs);
942 refcount = --(rqbd->rqbd_refcount);
944 /* request buffer is now idle: add to history */
945 list_move_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
946 svcpt->scp_hist_nrqbds++;
950 * I expect only about 1 or 2 rqbds need to be recycled here
952 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
953 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
954 struct ptlrpc_request_buffer_desc,
957 list_del(&rqbd->rqbd_list);
958 svcpt->scp_hist_nrqbds--;
961 * remove rqbd's reqs from svc's req history while
962 * I've got the service lock
964 list_for_each(tmp, &rqbd->rqbd_reqs) {
965 req = list_entry(tmp, struct ptlrpc_request,
967 /* Track the highest culled req seq */
968 if (req->rq_history_seq >
969 svcpt->scp_hist_seq_culled) {
970 svcpt->scp_hist_seq_culled =
973 list_del(&req->rq_history_list);
976 spin_unlock(&svcpt->scp_lock);
978 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
979 req = list_entry(rqbd->rqbd_reqs.next,
980 struct ptlrpc_request,
982 list_del(&req->rq_list);
983 ptlrpc_server_free_request(req);
986 spin_lock(&svcpt->scp_lock);
988 * now all reqs including the embedded req has been
989 * disposed, schedule request buffer for re-use
990 * or free it to drain some in excess.
992 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == 0);
993 if (svcpt->scp_nrqbds_posted >=
994 svc->srv_nbuf_per_group ||
995 (svc->srv_nrqbds_max != 0 &&
996 svcpt->scp_nrqbds_total > svc->srv_nrqbds_max) ||
997 test_req_buffer_pressure) {
998 /* like in ptlrpc_free_rqbd() */
999 svcpt->scp_nrqbds_total--;
1000 OBD_FREE_LARGE(rqbd->rqbd_buffer,
1004 list_add_tail(&rqbd->rqbd_list,
1005 &svcpt->scp_rqbd_idle);
1009 spin_unlock(&svcpt->scp_lock);
1010 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
1011 /* If we are low on memory, we are not interested in history */
1012 list_del(&req->rq_list);
1013 list_del_init(&req->rq_history_list);
1015 /* Track the highest culled req seq */
1016 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
1017 svcpt->scp_hist_seq_culled = req->rq_history_seq;
1019 spin_unlock(&svcpt->scp_lock);
1021 ptlrpc_server_free_request(req);
1023 spin_unlock(&svcpt->scp_lock);
1027 static void ptlrpc_add_exp_list_nolock(struct ptlrpc_request *req,
1028 struct obd_export *export, bool hp)
1030 __u16 tag = lustre_msg_get_tag(req->rq_reqmsg);
1033 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
1035 list_add(&req->rq_exp_list, &export->exp_reg_rpcs);
1036 if (tag && export->exp_used_slots)
1037 set_bit(tag - 1, export->exp_used_slots);
1040 static void ptlrpc_del_exp_list(struct ptlrpc_request *req)
1042 __u16 tag = lustre_msg_get_tag(req->rq_reqmsg);
1044 spin_lock(&req->rq_export->exp_rpc_lock);
1045 list_del_init(&req->rq_exp_list);
1046 if (tag && !req->rq_obsolete && req->rq_export->exp_used_slots)
1047 clear_bit(tag - 1, req->rq_export->exp_used_slots);
1048 spin_unlock(&req->rq_export->exp_rpc_lock);
1051 /** Change request export and move hp request from old export to new */
1052 void ptlrpc_request_change_export(struct ptlrpc_request *req,
1053 struct obd_export *export)
1055 if (req->rq_export != NULL) {
1056 LASSERT(!list_empty(&req->rq_exp_list));
1057 /* remove rq_exp_list from last export */
1058 ptlrpc_del_exp_list(req);
1059 /* export has one reference already, so it's safe to
1060 * add req to export queue here and get another
1061 * reference for request later
1063 spin_lock(&export->exp_rpc_lock);
1064 ptlrpc_add_exp_list_nolock(req, export, req->rq_ops != NULL);
1065 spin_unlock(&export->exp_rpc_lock);
1067 class_export_rpc_dec(req->rq_export);
1068 class_export_put(req->rq_export);
1071 /* request takes one export refcount */
1072 req->rq_export = class_export_get(export);
1073 class_export_rpc_inc(export);
1077 * to finish a request: stop sending more early replies, and release
1080 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
1081 struct ptlrpc_request *req)
1083 ptlrpc_server_hpreq_fini(req);
1085 ptlrpc_server_drop_request(req);
1089 * to finish an active request: stop sending more early replies, and release
1090 * the request. should be called after we finished handling the request.
1092 static void ptlrpc_server_finish_active_request(
1093 struct ptlrpc_service_part *svcpt,
1094 struct ptlrpc_request *req)
1096 spin_lock(&svcpt->scp_req_lock);
1097 ptlrpc_nrs_req_stop_nolock(req);
1098 svcpt->scp_nreqs_active--;
1100 svcpt->scp_nhreqs_active--;
1101 spin_unlock(&svcpt->scp_req_lock);
1103 ptlrpc_nrs_req_finalize(req);
1105 if (req->rq_export != NULL)
1106 class_export_rpc_dec(req->rq_export);
1108 ptlrpc_server_finish_request(svcpt, req);
1112 * This function makes sure dead exports are evicted in a timely manner.
1113 * This function is only called when some export receives a message (i.e.,
1114 * the network is up.)
1116 void ptlrpc_update_export_timer(struct obd_export *exp, time64_t extra_delay)
1118 struct obd_export *oldest_exp;
1119 time64_t oldest_time, new_time;
1126 * Compensate for slow machines, etc, by faking our request time
1127 * into the future. Although this can break the strict time-ordering
1128 * of the list, we can be really lazy here - we don't have to evict
1129 * at the exact right moment. Eventually, all silent exports
1130 * will make it to the top of the list.
1133 /* Do not pay attention on 1sec or smaller renewals. */
1134 new_time = ktime_get_real_seconds() + extra_delay;
1135 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1138 exp->exp_last_request_time = new_time;
1141 * exports may get disconnected from the chain even though the
1142 * export has references, so we must keep the spin lock while
1143 * manipulating the lists
1145 spin_lock(&exp->exp_obd->obd_dev_lock);
1147 if (list_empty(&exp->exp_obd_chain_timed)) {
1148 /* this one is not timed */
1149 spin_unlock(&exp->exp_obd->obd_dev_lock);
1153 list_move_tail(&exp->exp_obd_chain_timed,
1154 &exp->exp_obd->obd_exports_timed);
1156 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1157 struct obd_export, exp_obd_chain_timed);
1158 oldest_time = oldest_exp->exp_last_request_time;
1159 spin_unlock(&exp->exp_obd->obd_dev_lock);
1161 if (exp->exp_obd->obd_recovering) {
1162 /* be nice to everyone during recovery */
1167 /* Note - racing to start/reset the obd_eviction timer is safe */
1168 if (exp->exp_obd->obd_eviction_timer == 0) {
1169 /* Check if the oldest entry is expired. */
1170 if (ktime_get_real_seconds() >
1171 oldest_time + PING_EVICT_TIMEOUT + extra_delay) {
1173 * We need a second timer, in case the net was down and
1174 * it just came back. Since the pinger may skip every
1175 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1176 * we better wait for 3.
1178 exp->exp_obd->obd_eviction_timer =
1179 ktime_get_real_seconds() + 3 * PING_INTERVAL;
1180 CDEBUG(D_HA, "%s: Think about evicting %s from %lld\n",
1181 exp->exp_obd->obd_name,
1182 obd_export_nid2str(oldest_exp), oldest_time);
1185 if (ktime_get_real_seconds() >
1186 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1188 * The evictor won't evict anyone who we've heard from
1189 * recently, so we don't have to check before we start
1192 if (!ping_evictor_wake(exp))
1193 exp->exp_obd->obd_eviction_timer = 0;
1201 * Sanity check request \a req.
1202 * Return 0 if all is ok, error code otherwise.
1204 static int ptlrpc_check_req(struct ptlrpc_request *req)
1206 struct obd_device *obd = req->rq_export->exp_obd;
1209 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1210 req->rq_export->exp_conn_cnt)) {
1211 DEBUG_REQ(D_RPCTRACE, req,
1212 "DROPPING req from old connection %d < %d",
1213 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1214 req->rq_export->exp_conn_cnt);
1217 if (unlikely(obd == NULL || obd->obd_fail)) {
1219 * Failing over, don't handle any more reqs,
1220 * send error response instead.
1222 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1223 req, (obd != NULL) ? obd->obd_name : "unknown");
1225 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1226 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1227 !obd->obd_recovering) {
1228 DEBUG_REQ(D_ERROR, req,
1229 "Invalid replay without recovery");
1230 class_fail_export(req->rq_export);
1232 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1233 !obd->obd_recovering) {
1234 DEBUG_REQ(D_ERROR, req,
1235 "Invalid req with transno %llu without recovery",
1236 lustre_msg_get_transno(req->rq_reqmsg));
1237 class_fail_export(req->rq_export);
1241 if (unlikely(rc < 0)) {
1242 req->rq_status = rc;
1248 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1250 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1253 if (array->paa_count == 0) {
1254 del_timer(&svcpt->scp_at_timer);
1258 /* Set timer for closest deadline */
1259 next = array->paa_deadline - ktime_get_real_seconds() -
1262 ptlrpc_at_timer(cfs_timer_cb_arg(svcpt, scp_at_timer));
1264 mod_timer(&svcpt->scp_at_timer,
1265 jiffies + nsecs_to_jiffies(next * NSEC_PER_SEC));
1266 CDEBUG(D_INFO, "armed %s at %+llds\n",
1267 svcpt->scp_service->srv_name, next);
1271 /* Add rpc to early reply check list */
1272 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1274 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1275 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1276 struct ptlrpc_request *rq = NULL;
1282 if (req->rq_no_reply)
1285 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1288 spin_lock(&svcpt->scp_at_lock);
1289 LASSERT(list_empty(&req->rq_timed_list));
1291 div_u64_rem(req->rq_deadline, array->paa_size, &index);
1292 if (array->paa_reqs_count[index] > 0) {
1294 * latest rpcs will have the latest deadlines in the list,
1295 * so search backward.
1297 list_for_each_entry_reverse(rq, &array->paa_reqs_array[index],
1299 if (req->rq_deadline >= rq->rq_deadline) {
1300 list_add(&req->rq_timed_list,
1301 &rq->rq_timed_list);
1307 /* Add the request at the head of the list */
1308 if (list_empty(&req->rq_timed_list))
1309 list_add(&req->rq_timed_list, &array->paa_reqs_array[index]);
1311 spin_lock(&req->rq_lock);
1312 req->rq_at_linked = 1;
1313 spin_unlock(&req->rq_lock);
1314 req->rq_at_index = index;
1315 array->paa_reqs_count[index]++;
1317 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1318 array->paa_deadline = req->rq_deadline;
1319 ptlrpc_at_set_timer(svcpt);
1321 spin_unlock(&svcpt->scp_at_lock);
1326 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1328 struct ptlrpc_at_array *array;
1330 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1332 /* NB: must call with hold svcpt::scp_at_lock */
1333 LASSERT(!list_empty(&req->rq_timed_list));
1334 list_del_init(&req->rq_timed_list);
1336 spin_lock(&req->rq_lock);
1337 req->rq_at_linked = 0;
1338 spin_unlock(&req->rq_lock);
1340 array->paa_reqs_count[req->rq_at_index]--;
1345 * Attempt to extend the request deadline by sending an early reply to the
1348 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1350 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1351 struct ptlrpc_request *reqcopy;
1352 struct lustre_msg *reqmsg;
1353 timeout_t olddl = req->rq_deadline - ktime_get_real_seconds();
1359 if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_RECONNECT)) {
1360 /* don't send early reply */
1365 * deadline is when the client expects us to reply, margin is the
1366 * difference between clients' and servers' expectations
1368 DEBUG_REQ(D_ADAPTTO, req,
1369 "%ssending early reply (deadline %+ds, margin %+ds) for %d+%d",
1370 AT_OFF ? "AT off - not " : "",
1371 olddl, olddl - at_get(&svcpt->scp_at_estimate),
1372 at_get(&svcpt->scp_at_estimate), at_extra);
1378 /* below message is checked in replay-ost-single.sh test_9 */
1379 DEBUG_REQ(D_WARNING, req,
1380 "Already past deadline (%+ds), not sending early reply. Consider increasing at_early_margin (%d)?",
1381 olddl, at_early_margin);
1383 /* Return an error so we're not re-added to the timed list. */
1387 if ((lustre_msghdr_get_flags(req->rq_reqmsg) &
1388 MSGHDR_AT_SUPPORT) == 0) {
1389 DEBUG_REQ(D_INFO, req,
1390 "Wanted to ask client for more time, but no AT support");
1394 if (req->rq_export &&
1395 lustre_msg_get_flags(req->rq_reqmsg) &
1396 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1397 struct obd_device *obd_exp = req->rq_export->exp_obd;
1400 * During recovery, we don't want to send too many early
1401 * replies, but on the other hand we want to make sure the
1402 * client has enough time to resend if the rpc is lost. So
1403 * during the recovery period send at least 4 early replies,
1404 * spacing them every at_extra if we can. at_estimate should
1405 * always equal this fixed value during recovery.
1409 * Don't account request processing time into AT history
1410 * during recovery, it is not service time we need but
1411 * includes also waiting time for recovering clients
1413 newdl = min_t(time64_t, at_extra,
1414 obd_exp->obd_recovery_timeout / 4) +
1415 ktime_get_real_seconds();
1418 * We want to extend the request deadline by at_extra seconds,
1419 * so we set our service estimate to reflect how much time has
1420 * passed since this request arrived plus an additional
1421 * at_extra seconds. The client will calculate the new deadline
1422 * based on this service estimate (plus some additional time to
1423 * account for network latency). See ptlrpc_at_recv_early_reply
1425 at_measured(&svcpt->scp_at_estimate, at_extra +
1426 ktime_get_real_seconds() -
1427 req->rq_arrival_time.tv_sec);
1428 newdl = req->rq_arrival_time.tv_sec +
1429 at_get(&svcpt->scp_at_estimate);
1433 * Check to see if we've actually increased the deadline -
1434 * we may be past adaptive_max
1436 if (req->rq_deadline >= newdl) {
1437 DEBUG_REQ(D_WARNING, req,
1438 "Could not add any time (%d/%lld), not sending early reply",
1439 olddl, newdl - ktime_get_real_seconds());
1443 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1444 if (reqcopy == NULL)
1446 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1448 GOTO(out_free, rc = -ENOMEM);
1451 reqcopy->rq_reply_state = NULL;
1452 reqcopy->rq_rep_swab_mask = 0;
1453 reqcopy->rq_pack_bulk = 0;
1454 reqcopy->rq_pack_udesc = 0;
1455 reqcopy->rq_packed_final = 0;
1456 sptlrpc_svc_ctx_addref(reqcopy);
1457 /* We only need the reqmsg for the magic */
1458 reqcopy->rq_reqmsg = reqmsg;
1459 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1462 * tgt_brw_read() and tgt_brw_write() may have decided not to reply.
1463 * Without this check, we would fail the rq_no_reply assertion in
1464 * ptlrpc_send_reply().
1466 if (reqcopy->rq_no_reply)
1467 GOTO(out, rc = -ETIMEDOUT);
1469 LASSERT(atomic_read(&req->rq_refcount));
1470 /* if it is last refcount then early reply isn't needed */
1471 if (atomic_read(&req->rq_refcount) == 1) {
1472 DEBUG_REQ(D_ADAPTTO, reqcopy,
1473 "Normal reply already sent, abort early reply");
1474 GOTO(out, rc = -EINVAL);
1477 /* Connection ref */
1478 reqcopy->rq_export = class_conn2export(
1479 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1480 if (reqcopy->rq_export == NULL)
1481 GOTO(out, rc = -ENODEV);
1484 class_export_rpc_inc(reqcopy->rq_export);
1485 if (reqcopy->rq_export->exp_obd &&
1486 reqcopy->rq_export->exp_obd->obd_fail)
1487 GOTO(out_put, rc = -ENODEV);
1489 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1493 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1496 /* Adjust our own deadline to what we told the client */
1497 req->rq_deadline = newdl;
1498 req->rq_early_count++; /* number sent, server side */
1500 DEBUG_REQ(D_ERROR, req, "Early reply send failed: rc = %d", rc);
1504 * Free the (early) reply state from lustre_pack_reply.
1505 * (ptlrpc_send_reply takes it's own rs ref, so this is safe here)
1507 ptlrpc_req_drop_rs(reqcopy);
1510 class_export_rpc_dec(reqcopy->rq_export);
1511 class_export_put(reqcopy->rq_export);
1513 sptlrpc_svc_ctx_decref(reqcopy);
1514 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1516 ptlrpc_request_cache_free(reqcopy);
1521 * Send early replies to everybody expiring within at_early_margin
1522 * asking for at_extra time
1524 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1526 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1527 struct ptlrpc_request *rq, *n;
1528 LIST_HEAD(work_list);
1531 time64_t now = ktime_get_real_seconds();
1533 int first, counter = 0;
1536 spin_lock(&svcpt->scp_at_lock);
1537 if (svcpt->scp_at_check == 0) {
1538 spin_unlock(&svcpt->scp_at_lock);
1541 delay_ms = ktime_ms_delta(ktime_get(), svcpt->scp_at_checktime);
1542 svcpt->scp_at_check = 0;
1544 if (array->paa_count == 0) {
1545 spin_unlock(&svcpt->scp_at_lock);
1549 /* The timer went off, but maybe the nearest rpc already completed. */
1550 first = array->paa_deadline - now;
1551 if (first > at_early_margin) {
1552 /* We've still got plenty of time. Reset the timer. */
1553 ptlrpc_at_set_timer(svcpt);
1554 spin_unlock(&svcpt->scp_at_lock);
1559 * We're close to a timeout, and we don't know how much longer the
1560 * server will take. Send early replies to everyone expiring soon.
1563 div_u64_rem(array->paa_deadline, array->paa_size, &index);
1564 count = array->paa_count;
1566 count -= array->paa_reqs_count[index];
1567 list_for_each_entry_safe(rq, n,
1568 &array->paa_reqs_array[index],
1570 if (rq->rq_deadline > now + at_early_margin) {
1571 /* update the earliest deadline */
1572 if (deadline == -1 ||
1573 rq->rq_deadline < deadline)
1574 deadline = rq->rq_deadline;
1579 * ptlrpc_server_drop_request() may drop
1580 * refcount to 0 already. Let's check this and
1581 * don't add entry to work_list
1583 if (likely(atomic_inc_not_zero(&rq->rq_refcount))) {
1584 ptlrpc_at_remove_timed(rq);
1585 list_add(&rq->rq_timed_list, &work_list);
1587 ptlrpc_at_remove_timed(rq);
1593 if (++index >= array->paa_size)
1596 array->paa_deadline = deadline;
1597 /* we have a new earliest deadline, restart the timer */
1598 ptlrpc_at_set_timer(svcpt);
1600 spin_unlock(&svcpt->scp_at_lock);
1603 "timeout in %+ds, asking for %d secs on %d early replies\n",
1604 first, at_extra, counter);
1607 * We're already past request deadlines before we even get a
1608 * chance to send early replies
1610 LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
1611 svcpt->scp_service->srv_name);
1612 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%lldms\n",
1613 counter, svcpt->scp_nreqs_incoming,
1614 svcpt->scp_nreqs_active,
1615 at_get(&svcpt->scp_at_estimate), delay_ms);
1619 * we took additional refcount so entries can't be deleted from list, no
1622 while (!list_empty(&work_list)) {
1623 rq = list_entry(work_list.next, struct ptlrpc_request,
1625 list_del_init(&rq->rq_timed_list);
1627 if (ptlrpc_at_send_early_reply(rq) == 0)
1628 ptlrpc_at_add_timed(rq);
1630 ptlrpc_server_drop_request(rq);
1633 RETURN(1); /* return "did_something" for liblustre */
1637 * Check if we are already handling earlier incarnation of this request.
1638 * Called under &req->rq_export->exp_rpc_lock locked
1640 static struct ptlrpc_request*
1641 ptlrpc_server_check_resend_in_progress(struct ptlrpc_request *req)
1643 struct ptlrpc_request *tmp = NULL;
1645 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ||
1646 (atomic_read(&req->rq_export->exp_rpc_count) == 0))
1650 * bulk request are aborted upon reconnect, don't try to
1653 if (req->rq_bulk_write || req->rq_bulk_read)
1657 * This list should not be longer than max_requests in
1658 * flights on the client, so it is not all that long.
1659 * Also we only hit this codepath in case of a resent
1660 * request which makes it even more rarely hit
1662 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs,
1664 /* Found duplicate one */
1665 if (tmp->rq_xid == req->rq_xid)
1668 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs,
1670 /* Found duplicate one */
1671 if (tmp->rq_xid == req->rq_xid)
1677 DEBUG_REQ(D_HA, req, "Found duplicate req in processing");
1678 DEBUG_REQ(D_HA, tmp, "Request being processed");
1682 #ifdef HAVE_SERVER_SUPPORT
1683 static void ptlrpc_server_mark_obsolete(struct ptlrpc_request *req)
1685 req->rq_obsolete = 1;
1689 ptlrpc_server_mark_in_progress_obsolete(struct ptlrpc_request *req)
1691 struct ptlrpc_request *tmp = NULL;
1694 if (!tgt_is_increasing_xid_client(req->rq_export) ||
1695 req->rq_export->exp_used_slots == NULL)
1698 tag = lustre_msg_get_tag(req->rq_reqmsg);
1702 if (!test_bit(tag - 1, req->rq_export->exp_used_slots))
1705 /* This list should not be longer than max_requests in
1706 * flights on the client, so it is not all that long.
1707 * Also we only hit this codepath in case of a resent
1708 * request which makes it even more rarely hit */
1709 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs, rq_exp_list) {
1710 if (tag == lustre_msg_get_tag(tmp->rq_reqmsg) &&
1711 req->rq_xid > tmp->rq_xid)
1712 ptlrpc_server_mark_obsolete(tmp);
1715 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs, rq_exp_list) {
1716 if (tag == lustre_msg_get_tag(tmp->rq_reqmsg) &&
1717 req->rq_xid > tmp->rq_xid)
1718 ptlrpc_server_mark_obsolete(tmp);
1724 * Check if a request should be assigned with a high priority.
1726 * \retval < 0: error occurred
1727 * 0: normal RPC request
1728 * +1: high priority request
1730 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1731 struct ptlrpc_request *req)
1736 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL) {
1737 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1744 if (req->rq_export != NULL && req->rq_ops != NULL) {
1746 * Perform request specific check. We should do this
1747 * check before the request is added into exp_hp_rpcs
1748 * list otherwise it may hit swab race at LU-1044.
1750 if (req->rq_ops->hpreq_check != NULL) {
1751 rc = req->rq_ops->hpreq_check(req);
1752 if (rc == -ESTALE) {
1753 req->rq_status = rc;
1757 * can only return error,
1758 * 0 for normal request,
1759 * or 1 for high priority request
1768 /** Remove the request from the export list. */
1769 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1772 if (req->rq_export) {
1774 * refresh lock timeout again so that client has more
1775 * room to send lock cancel RPC.
1777 if (req->rq_ops && req->rq_ops->hpreq_fini)
1778 req->rq_ops->hpreq_fini(req);
1780 ptlrpc_del_exp_list(req);
1785 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1790 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1791 .hpreq_check = ptlrpc_hpreq_check,
1794 /* Hi-Priority RPC check by RPC operation code. */
1795 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1797 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1800 * Check for export to let only reconnects for not yet evicted
1801 * export to become a HP rpc.
1803 if ((req->rq_export != NULL) &&
1804 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1805 req->rq_ops = &ptlrpc_hpreq_common;
1809 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1811 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1812 struct ptlrpc_request *req)
1816 struct ptlrpc_request *orig;
1820 rc = ptlrpc_server_hpreq_init(svcpt, req);
1825 ptlrpc_nrs_req_initialize(svcpt, req, hp);
1827 while (req->rq_export != NULL) {
1828 struct obd_export *exp = req->rq_export;
1831 * do search for duplicated xid and the adding to the list
1834 spin_lock_bh(&exp->exp_rpc_lock);
1835 #ifdef HAVE_SERVER_SUPPORT
1836 ptlrpc_server_mark_in_progress_obsolete(req);
1838 orig = ptlrpc_server_check_resend_in_progress(req);
1839 if (orig && OBD_FAIL_PRECHECK(OBD_FAIL_PTLRPC_RESEND_RACE)) {
1840 spin_unlock_bh(&exp->exp_rpc_lock);
1842 OBD_RACE(OBD_FAIL_PTLRPC_RESEND_RACE);
1843 msleep(4 * MSEC_PER_SEC);
1847 if (orig && likely(atomic_inc_not_zero(&orig->rq_refcount))) {
1850 spin_unlock_bh(&exp->exp_rpc_lock);
1853 * When the client resend request and the server has
1854 * the previous copy of it, we need to update deadlines,
1855 * to be sure that the client and the server have equal
1856 * request deadlines.
1859 spin_lock(&orig->rq_rqbd->rqbd_svcpt->scp_at_lock);
1860 linked = orig->rq_at_linked;
1862 ptlrpc_at_remove_timed(orig);
1863 spin_unlock(&orig->rq_rqbd->rqbd_svcpt->scp_at_lock);
1864 orig->rq_deadline = req->rq_deadline;
1866 ptlrpc_at_add_timed(orig);
1867 ptlrpc_server_drop_request(orig);
1868 ptlrpc_nrs_req_finalize(req);
1870 /* don't mark slot unused for resend in progress */
1871 req->rq_obsolete = 1;
1876 ptlrpc_add_exp_list_nolock(req, exp, hp || req->rq_ops != NULL);
1878 spin_unlock_bh(&exp->exp_rpc_lock);
1883 * the current thread is not the processing thread for this request
1884 * since that, but request is in exp_hp_list and can be find there.
1885 * Remove all relations between request and old thread.
1887 req->rq_svc_thread->t_env->le_ses = NULL;
1888 req->rq_svc_thread = NULL;
1889 req->rq_session.lc_thread = NULL;
1891 ptlrpc_nrs_req_add(svcpt, req, hp);
1897 * Allow to handle high priority request
1898 * User can call it w/o any lock but need to hold
1899 * ptlrpc_service_part::scp_req_lock to get reliable result
1901 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1904 int running = svcpt->scp_nthrs_running;
1906 if (!nrs_svcpt_has_hp(svcpt))
1912 if (ptlrpc_nrs_req_throttling_nolock(svcpt, true))
1915 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1916 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1917 /* leave just 1 thread for normal RPCs */
1918 running = PTLRPC_NTHRS_INIT;
1919 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1923 if (svcpt->scp_nreqs_active >= running - 1)
1926 if (svcpt->scp_nhreqs_active == 0)
1929 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1930 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1933 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1936 return ptlrpc_server_allow_high(svcpt, force) &&
1937 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1941 * Only allow normal priority requests on a service that has a high-priority
1942 * queue if forced (i.e. cleanup), if there are other high priority requests
1943 * already being processed (i.e. those threads can service more high-priority
1944 * requests), or if there are enough idle threads that a later thread can do
1945 * a high priority request.
1946 * User can call it w/o any lock but need to hold
1947 * ptlrpc_service_part::scp_req_lock to get reliable result
1949 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1952 int running = svcpt->scp_nthrs_running;
1954 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1955 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1956 /* leave just 1 thread for normal RPCs */
1957 running = PTLRPC_NTHRS_INIT;
1958 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1965 if (ptlrpc_nrs_req_throttling_nolock(svcpt, false))
1968 if (svcpt->scp_nreqs_active < running - 2)
1971 if (svcpt->scp_nreqs_active >= running - 1)
1974 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1977 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1980 return ptlrpc_server_allow_normal(svcpt, force) &&
1981 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1985 * Returns true if there are requests available in incoming
1986 * request queue for processing and it is allowed to fetch them.
1987 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1988 * to get reliable result
1989 * \see ptlrpc_server_allow_normal
1990 * \see ptlrpc_server_allow high
1993 bool ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt,
1996 return ptlrpc_server_high_pending(svcpt, force) ||
1997 ptlrpc_server_normal_pending(svcpt, force);
2001 * Fetch a request for processing from queue of unprocessed requests.
2002 * Favors high-priority requests.
2003 * Returns a pointer to fetched request.
2005 static struct ptlrpc_request *
2006 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
2008 struct ptlrpc_request *req = NULL;
2012 spin_lock(&svcpt->scp_req_lock);
2014 if (ptlrpc_server_high_pending(svcpt, force)) {
2015 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
2017 svcpt->scp_hreq_count++;
2022 if (ptlrpc_server_normal_pending(svcpt, force)) {
2023 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
2025 svcpt->scp_hreq_count = 0;
2030 spin_unlock(&svcpt->scp_req_lock);
2034 svcpt->scp_nreqs_active++;
2036 svcpt->scp_nhreqs_active++;
2038 spin_unlock(&svcpt->scp_req_lock);
2040 if (likely(req->rq_export))
2041 class_export_rpc_inc(req->rq_export);
2047 * Handle freshly incoming reqs, add to timed early reply list,
2048 * pass on to regular request queue.
2049 * All incoming requests pass through here before getting into
2050 * ptlrpc_server_handle_req later on.
2052 static int ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
2053 struct ptlrpc_thread *thread)
2055 struct ptlrpc_service *svc = svcpt->scp_service;
2056 struct ptlrpc_request *req;
2062 spin_lock(&svcpt->scp_lock);
2063 if (list_empty(&svcpt->scp_req_incoming)) {
2064 spin_unlock(&svcpt->scp_lock);
2068 req = list_entry(svcpt->scp_req_incoming.next,
2069 struct ptlrpc_request, rq_list);
2070 list_del_init(&req->rq_list);
2071 svcpt->scp_nreqs_incoming--;
2073 * Consider this still a "queued" request as far as stats are
2076 spin_unlock(&svcpt->scp_lock);
2078 /* go through security check/transform */
2079 rc = sptlrpc_svc_unwrap_request(req);
2083 case SECSVC_COMPLETE:
2084 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
2093 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
2094 * redo it wouldn't be harmful.
2096 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
2097 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
2099 CERROR("error unpacking request: ptl %d from %s x%llu\n",
2100 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
2106 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
2108 CERROR("error unpacking ptlrpc body: ptl %d from %s x %llu\n",
2109 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
2114 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
2115 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
2116 CERROR("drop incoming rpc opc %u, x%llu\n",
2117 cfs_fail_val, req->rq_xid);
2122 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
2123 CERROR("wrong packet type received (type=%u) from %s\n",
2124 lustre_msg_get_type(req->rq_reqmsg),
2125 libcfs_id2str(req->rq_peer));
2129 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2133 req->rq_bulk_write = 1;
2137 case MGS_CONFIG_READ:
2138 req->rq_bulk_read = 1;
2142 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
2144 req->rq_export = class_conn2export(
2145 lustre_msg_get_handle(req->rq_reqmsg));
2146 if (req->rq_export) {
2147 rc = ptlrpc_check_req(req);
2149 rc = sptlrpc_target_export_check(req->rq_export, req);
2151 DEBUG_REQ(D_ERROR, req,
2152 "DROPPING req with illegal security flavor");
2157 ptlrpc_update_export_timer(req->rq_export, 0);
2160 /* req_in handling should/must be fast */
2161 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
2162 DEBUG_REQ(D_WARNING, req, "Slow req_in handling %llds",
2163 ktime_get_real_seconds() -
2164 req->rq_arrival_time.tv_sec);
2166 /* Set rpc server deadline and add it to the timed list */
2167 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
2168 MSGHDR_AT_SUPPORT) ?
2169 /* The max time the client expects us to take */
2170 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
2172 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
2173 if (unlikely(deadline == 0)) {
2174 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
2178 /* Skip early reply */
2179 if (OBD_FAIL_PRECHECK(OBD_FAIL_MDS_RESEND))
2180 req->rq_deadline += obd_timeout;
2182 req->rq_svc_thread = thread;
2183 if (thread != NULL) {
2185 * initialize request session, it is needed for request
2186 * processing by target
2188 rc = lu_context_init(&req->rq_session, LCT_SERVER_SESSION |
2191 CERROR("%s: failure to initialize session: rc = %d\n",
2192 thread->t_name, rc);
2195 req->rq_session.lc_thread = thread;
2196 lu_context_enter(&req->rq_session);
2197 thread->t_env->le_ses = &req->rq_session;
2200 ptlrpc_at_add_timed(req);
2202 /* Move it over to the request processing queue */
2203 rc = ptlrpc_server_request_add(svcpt, req);
2207 wake_up(&svcpt->scp_waitq);
2211 ptlrpc_server_finish_request(svcpt, req);
2217 * Main incoming request handling logic.
2218 * Calls handler function from service to do actual processing.
2220 static int ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
2221 struct ptlrpc_thread *thread)
2223 struct ptlrpc_service *svc = svcpt->scp_service;
2224 struct ptlrpc_request *request;
2234 request = ptlrpc_server_request_get(svcpt, false);
2235 if (request == NULL)
2238 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
2239 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
2240 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
2241 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
2243 if (unlikely(fail_opc)) {
2244 if (request->rq_export && request->rq_ops)
2245 OBD_FAIL_TIMEOUT(fail_opc, 4);
2248 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
2250 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
2251 libcfs_debug_dumplog();
2253 work_start = ktime_get_real();
2254 arrived = timespec64_to_ktime(request->rq_arrival_time);
2255 timediff_usecs = ktime_us_delta(work_start, arrived);
2256 if (likely(svc->srv_stats != NULL)) {
2257 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
2259 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
2260 svcpt->scp_nreqs_incoming);
2261 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
2262 svcpt->scp_nreqs_active);
2263 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
2264 at_get(&svcpt->scp_at_estimate));
2267 if (likely(request->rq_export)) {
2268 if (unlikely(ptlrpc_check_req(request)))
2270 ptlrpc_update_export_timer(request->rq_export,
2271 div_u64(timediff_usecs,
2276 * Discard requests queued for longer than the deadline.
2277 * The deadline is increased if we send an early reply.
2279 if (ktime_get_real_seconds() > request->rq_deadline) {
2280 DEBUG_REQ(D_ERROR, request,
2281 "Dropping timed-out request from %s: deadline %lld/%llds ago",
2282 libcfs_id2str(request->rq_peer),
2283 request->rq_deadline -
2284 request->rq_arrival_time.tv_sec,
2285 ktime_get_real_seconds() - request->rq_deadline);
2290 "Handling RPC req@%p pname:cluuid+ref:pid:xid:nid:opc:job %s:%s+%d:%d:x%llu:%s:%d:%s\n",
2291 request, current->comm,
2292 (request->rq_export ?
2293 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2294 (request->rq_export ?
2295 refcount_read(&request->rq_export->exp_handle.h_ref) : -99),
2296 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
2297 libcfs_id2str(request->rq_peer),
2298 lustre_msg_get_opc(request->rq_reqmsg),
2299 lustre_msg_get_jobid(request->rq_reqmsg) ?: "");
2301 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
2302 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
2304 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
2306 /* re-assign request and sesson thread to the current one */
2307 request->rq_svc_thread = thread;
2308 if (thread != NULL) {
2309 LASSERT(request->rq_session.lc_thread == NULL);
2310 request->rq_session.lc_thread = thread;
2311 thread->t_env->le_ses = &request->rq_session;
2313 svc->srv_ops.so_req_handler(request);
2315 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
2318 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
2319 DEBUG_REQ(D_WARNING, request,
2320 "Request took longer than estimated (%lld/%llds); client may timeout",
2321 request->rq_deadline -
2322 request->rq_arrival_time.tv_sec,
2323 ktime_get_real_seconds() - request->rq_deadline);
2326 work_end = ktime_get_real();
2327 timediff_usecs = ktime_us_delta(work_end, work_start);
2328 arrived_usecs = ktime_us_delta(work_end, arrived);
2330 "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",
2331 request, current->comm,
2332 (request->rq_export ?
2333 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2334 (request->rq_export ?
2335 refcount_read(&request->rq_export->exp_handle.h_ref) : -99),
2336 lustre_msg_get_status(request->rq_reqmsg),
2338 libcfs_id2str(request->rq_peer),
2339 lustre_msg_get_opc(request->rq_reqmsg),
2340 lustre_msg_get_jobid(request->rq_reqmsg) ?: "",
2343 (request->rq_repmsg ?
2344 lustre_msg_get_transno(request->rq_repmsg) :
2345 request->rq_transno),
2347 (request->rq_repmsg ?
2348 lustre_msg_get_status(request->rq_repmsg) : -999));
2349 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2350 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2351 int opc = opcode_offset(op);
2353 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2354 LASSERT(opc < LUSTRE_MAX_OPCODES);
2355 lprocfs_counter_add(svc->srv_stats,
2356 opc + EXTRA_MAX_OPCODES,
2360 if (unlikely(request->rq_early_count)) {
2361 DEBUG_REQ(D_ADAPTTO, request,
2362 "sent %d early replies before finishing in %llds",
2363 request->rq_early_count,
2364 div_u64(arrived_usecs, USEC_PER_SEC));
2367 ptlrpc_server_finish_active_request(svcpt, request);
2373 * An internal function to process a single reply state object.
2375 static int ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2377 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2378 struct ptlrpc_service *svc = svcpt->scp_service;
2379 struct obd_export *exp;
2385 exp = rs->rs_export;
2387 LASSERT(rs->rs_difficult);
2388 LASSERT(rs->rs_scheduled);
2389 LASSERT(list_empty(&rs->rs_list));
2392 * The disk commit callback holds exp_uncommitted_replies_lock while it
2393 * iterates over newly committed replies, removing them from
2394 * exp_uncommitted_replies. It then drops this lock and schedules the
2395 * replies it found for handling here.
2397 * We can avoid contention for exp_uncommitted_replies_lock between the
2398 * HRT threads and further commit callbacks by checking rs_committed
2399 * which is set in the commit callback while it holds both
2400 * rs_lock and exp_uncommitted_reples.
2402 * If we see rs_committed clear, the commit callback _may_ not have
2403 * handled this reply yet and we race with it to grab
2404 * exp_uncommitted_replies_lock before removing the reply from
2405 * exp_uncommitted_replies. Note that if we lose the race and the
2406 * reply has already been removed, list_del_init() is a noop.
2408 * If we see rs_committed set, we know the commit callback is handling,
2409 * or has handled this reply since store reordering might allow us to
2410 * see rs_committed set out of sequence. But since this is done
2411 * holding rs_lock, we can be sure it has all completed once we hold
2412 * rs_lock, which we do right next.
2414 if (!rs->rs_committed) {
2416 * if rs was commited, no need to convert locks, don't check
2417 * rs_committed here because rs may never be added into
2418 * exp_uncommitted_replies and this flag never be set, see
2419 * target_send_reply()
2421 if (rs->rs_convert_lock &&
2422 rs->rs_transno > exp->exp_last_committed) {
2423 struct ldlm_lock *lock;
2424 struct ldlm_lock *ack_locks[RS_MAX_LOCKS] = { NULL };
2426 spin_lock(&rs->rs_lock);
2427 if (rs->rs_convert_lock &&
2428 rs->rs_transno > exp->exp_last_committed) {
2429 nlocks = rs->rs_nlocks;
2430 while (nlocks-- > 0) {
2432 * NB don't assume rs is always handled
2433 * by the same service thread (see
2434 * ptlrpc_hr_select, so REP-ACK hr may
2435 * race with trans commit, while the
2436 * latter will release locks, get locks
2437 * here early to convert to COS mode
2440 lock = ldlm_handle2lock(
2441 &rs->rs_locks[nlocks]);
2443 ack_locks[nlocks] = lock;
2444 rs->rs_modes[nlocks] = LCK_COS;
2446 nlocks = rs->rs_nlocks;
2447 rs->rs_convert_lock = 0;
2449 * clear rs_scheduled so that commit callback
2450 * can schedule again
2452 rs->rs_scheduled = 0;
2453 spin_unlock(&rs->rs_lock);
2455 while (nlocks-- > 0) {
2456 lock = ack_locks[nlocks];
2457 ldlm_lock_mode_downgrade(lock, LCK_COS);
2458 LDLM_LOCK_PUT(lock);
2462 spin_unlock(&rs->rs_lock);
2465 spin_lock(&exp->exp_uncommitted_replies_lock);
2466 list_del_init(&rs->rs_obd_list);
2467 spin_unlock(&exp->exp_uncommitted_replies_lock);
2470 spin_lock(&exp->exp_lock);
2471 /* Noop if removed already */
2472 list_del_init(&rs->rs_exp_list);
2473 spin_unlock(&exp->exp_lock);
2475 spin_lock(&rs->rs_lock);
2477 been_handled = rs->rs_handled;
2480 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2481 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2483 if (nlocks == 0 && !been_handled) {
2485 * If we see this, we should already have seen the warning
2486 * in mds_steal_ack_locks()
2489 "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
2490 rs, rs->rs_xid, rs->rs_transno, rs->rs_opc,
2491 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2494 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2495 spin_unlock(&rs->rs_lock);
2497 if (!been_handled && rs->rs_on_net) {
2498 LNetMDUnlink(rs->rs_md_h);
2499 /* Ignore return code; we're racing with completion */
2502 while (nlocks-- > 0)
2503 ldlm_lock_decref(&rs->rs_locks[nlocks],
2504 rs->rs_modes[nlocks]);
2506 spin_lock(&rs->rs_lock);
2509 rs->rs_scheduled = 0;
2510 rs->rs_convert_lock = 0;
2512 if (!rs->rs_on_net) {
2514 spin_unlock(&rs->rs_lock);
2516 class_export_put(exp);
2517 rs->rs_export = NULL;
2518 ptlrpc_rs_decref(rs);
2519 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2520 svc->srv_is_stopping)
2521 wake_up_all(&svcpt->scp_waitq);
2525 /* still on the net; callback will schedule */
2526 spin_unlock(&rs->rs_lock);
2531 static void ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2533 int avail = svcpt->scp_nrqbds_posted;
2534 int low_water = test_req_buffer_pressure ? 0 :
2535 svcpt->scp_service->srv_nbuf_per_group / 2;
2537 /* NB I'm not locking; just looking. */
2540 * CAVEAT EMPTOR: We might be allocating buffers here because we've
2541 * allowed the request history to grow out of control. We could put a
2542 * sanity check on that here and cull some history if we need the
2546 if (avail <= low_water)
2547 ptlrpc_grow_req_bufs(svcpt, 1);
2549 if (svcpt->scp_service->srv_stats) {
2550 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2551 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2555 static inline int ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2557 return svcpt->scp_nreqs_active <
2558 svcpt->scp_nthrs_running - 1 -
2559 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2563 * allowed to create more threads
2564 * user can call it w/o any lock but need to hold
2565 * ptlrpc_service_part::scp_lock to get reliable result
2567 static inline int ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2569 return svcpt->scp_nthrs_running +
2570 svcpt->scp_nthrs_starting <
2571 svcpt->scp_service->srv_nthrs_cpt_limit;
2575 * too many requests and allowed to create more threads
2577 static inline int ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2579 return !ptlrpc_threads_enough(svcpt) &&
2580 ptlrpc_threads_increasable(svcpt);
2583 static inline int ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2585 return thread_is_stopping(thread) ||
2586 thread->t_svcpt->scp_service->srv_is_stopping;
2589 /* stop the highest numbered thread if there are too many threads running */
2590 static inline bool ptlrpc_thread_should_stop(struct ptlrpc_thread *thread)
2592 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2594 return thread->t_id >= svcpt->scp_service->srv_nthrs_cpt_limit &&
2595 thread->t_id == svcpt->scp_thr_nextid - 1;
2598 static void ptlrpc_stop_thread(struct ptlrpc_thread *thread)
2600 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2601 thread->t_svcpt->scp_service->srv_thread_name, thread->t_id);
2602 thread_add_flags(thread, SVC_STOPPING);
2605 static inline void ptlrpc_thread_stop(struct ptlrpc_thread *thread)
2607 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2609 spin_lock(&svcpt->scp_lock);
2610 if (ptlrpc_thread_should_stop(thread)) {
2611 ptlrpc_stop_thread(thread);
2612 svcpt->scp_thr_nextid--;
2614 spin_unlock(&svcpt->scp_lock);
2617 static inline int ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2619 return !list_empty(&svcpt->scp_rqbd_idle) &&
2620 svcpt->scp_rqbd_timeout == 0;
2624 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2626 return svcpt->scp_at_check;
2630 * If a thread runs too long or spends to much time on a single request,
2631 * we want to know about it, so we set up a delayed work item as a watchdog.
2632 * If it fires, we display a stack trace of the delayed thread,
2633 * providing we aren't rate-limited
2635 * Watchdog stack traces are limited to 3 per 'libcfs_watchdog_ratelimit'
2638 static struct ratelimit_state watchdog_limit;
2640 static void ptlrpc_watchdog_fire(struct work_struct *w)
2642 struct ptlrpc_thread *thread = container_of(w, struct ptlrpc_thread,
2644 u64 ms_lapse = ktime_ms_delta(ktime_get(), thread->t_touched);
2645 u32 ms_frac = do_div(ms_lapse, MSEC_PER_SEC);
2647 /* ___ratelimit() returns true if the action is NOT ratelimited */
2648 if (__ratelimit(&watchdog_limit)) {
2649 /* below message is checked in sanity-quota.sh test_6,18 */
2650 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",
2651 thread->t_task->comm, thread->t_task->pid,
2654 libcfs_debug_dumpstack(thread->t_task);
2656 /* below message is checked in sanity-quota.sh test_6,18 */
2657 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",
2658 thread->t_task->comm, thread->t_task->pid,
2659 ms_lapse, ms_frac, libcfs_watchdog_ratelimit);
2663 void ptlrpc_watchdog_init(struct delayed_work *work, timeout_t timeout)
2665 INIT_DELAYED_WORK(work, ptlrpc_watchdog_fire);
2666 schedule_delayed_work(work, cfs_time_seconds(timeout));
2669 void ptlrpc_watchdog_disable(struct delayed_work *work)
2671 cancel_delayed_work_sync(work);
2674 void ptlrpc_watchdog_touch(struct delayed_work *work, timeout_t timeout)
2676 struct ptlrpc_thread *thread = container_of(&work->work,
2677 struct ptlrpc_thread,
2679 thread->t_touched = ktime_get();
2680 mod_delayed_work(system_wq, work, cfs_time_seconds(timeout));
2684 * requests wait on preprocessing
2685 * user can call it w/o any lock but need to hold
2686 * ptlrpc_service_part::scp_lock to get reliable result
2689 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2691 return !list_empty(&svcpt->scp_req_incoming);
2694 static __attribute__((__noinline__)) int
2695 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2696 struct ptlrpc_thread *thread)
2698 ptlrpc_watchdog_disable(&thread->t_watchdog);
2702 if (svcpt->scp_rqbd_timeout == 0)
2703 /* Don't exit while there are replies to be handled */
2704 wait_event_idle_exclusive_lifo(
2706 ptlrpc_thread_stopping(thread) ||
2707 ptlrpc_server_request_incoming(svcpt) ||
2708 ptlrpc_server_request_pending(svcpt, false) ||
2709 ptlrpc_rqbd_pending(svcpt) ||
2710 ptlrpc_at_check(svcpt));
2711 else if (wait_event_idle_exclusive_lifo_timeout(
2713 ptlrpc_thread_stopping(thread) ||
2714 ptlrpc_server_request_incoming(svcpt) ||
2715 ptlrpc_server_request_pending(svcpt, false) ||
2716 ptlrpc_rqbd_pending(svcpt) ||
2717 ptlrpc_at_check(svcpt),
2718 svcpt->scp_rqbd_timeout) == 0)
2719 svcpt->scp_rqbd_timeout = 0;
2721 if (ptlrpc_thread_stopping(thread))
2724 ptlrpc_watchdog_touch(&thread->t_watchdog,
2725 ptlrpc_server_get_timeout(svcpt));
2730 * Main thread body for service threads.
2731 * Waits in a loop waiting for new requests to process to appear.
2732 * Every time an incoming requests is added to its queue, a waitq
2733 * is woken up and one of the threads will handle it.
2735 static int ptlrpc_main(void *arg)
2737 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2738 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2739 struct ptlrpc_service *svc = svcpt->scp_service;
2740 struct ptlrpc_reply_state *rs;
2741 struct group_info *ginfo = NULL;
2743 int counter = 0, rc = 0;
2747 thread->t_task = current;
2748 thread->t_pid = current->pid;
2750 if (svc->srv_cpt_bind) {
2751 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2753 CWARN("%s: failed to bind %s on CPT %d\n",
2754 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2758 ginfo = groups_alloc(0);
2760 GOTO(out, rc = -ENOMEM);
2762 set_current_groups(ginfo);
2763 put_group_info(ginfo);
2765 if (svc->srv_ops.so_thr_init != NULL) {
2766 rc = svc->srv_ops.so_thr_init(thread);
2773 GOTO(out_srv_fini, rc = -ENOMEM);
2774 rc = lu_env_add(env);
2778 rc = lu_context_init(&env->le_ctx,
2779 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2781 GOTO(out_env_remove, rc);
2783 thread->t_env = env;
2784 env->le_ctx.lc_thread = thread;
2785 env->le_ctx.lc_cookie = 0x6;
2787 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2788 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2792 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2793 svc->srv_name, svcpt->scp_cpt, rc);
2794 GOTO(out_ctx_fini, rc);
2797 /* Alloc reply state structure for this one */
2798 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2800 GOTO(out_ctx_fini, rc = -ENOMEM);
2802 spin_lock(&svcpt->scp_lock);
2804 LASSERT(thread_is_starting(thread));
2805 thread_clear_flags(thread, SVC_STARTING);
2807 LASSERT(svcpt->scp_nthrs_starting == 1);
2808 svcpt->scp_nthrs_starting--;
2811 * SVC_STOPPING may already be set here if someone else is trying
2812 * to stop the service while this new thread has been dynamically
2813 * forked. We still set SVC_RUNNING to let our creator know that
2814 * we are now running, however we will exit as soon as possible
2816 thread_add_flags(thread, SVC_RUNNING);
2817 svcpt->scp_nthrs_running++;
2818 spin_unlock(&svcpt->scp_lock);
2820 /* wake up our creator in case he's still waiting. */
2821 wake_up(&thread->t_ctl_waitq);
2823 thread->t_touched = ktime_get();
2824 ptlrpc_watchdog_init(&thread->t_watchdog,
2825 ptlrpc_server_get_timeout(svcpt));
2827 spin_lock(&svcpt->scp_rep_lock);
2828 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2829 wake_up(&svcpt->scp_rep_waitq);
2830 spin_unlock(&svcpt->scp_rep_lock);
2832 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2833 svcpt->scp_nthrs_running);
2835 /* XXX maintain a list of all managed devices: insert here */
2836 while (!ptlrpc_thread_stopping(thread)) {
2837 if (ptlrpc_wait_event(svcpt, thread))
2840 ptlrpc_check_rqbd_pool(svcpt);
2842 if (ptlrpc_threads_need_create(svcpt)) {
2843 /* Ignore return code - we tried... */
2844 ptlrpc_start_thread(svcpt, 0);
2847 /* reset le_ses to initial state */
2849 /* Refill the context before execution to make sure
2850 * all thread keys are allocated */
2852 /* Process all incoming reqs before handling any */
2853 if (ptlrpc_server_request_incoming(svcpt)) {
2854 lu_context_enter(&env->le_ctx);
2855 ptlrpc_server_handle_req_in(svcpt, thread);
2856 lu_context_exit(&env->le_ctx);
2858 /* but limit ourselves in case of flood */
2859 if (counter++ < 100)
2864 if (ptlrpc_at_check(svcpt))
2865 ptlrpc_at_check_timed(svcpt);
2867 if (ptlrpc_server_request_pending(svcpt, false)) {
2868 lu_context_enter(&env->le_ctx);
2869 ptlrpc_server_handle_request(svcpt, thread);
2870 lu_context_exit(&env->le_ctx);
2873 if (ptlrpc_rqbd_pending(svcpt) &&
2874 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2876 * I just failed to repost request buffers.
2877 * Wait for a timeout (unless something else
2878 * happens) before I try again
2880 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2881 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2882 svcpt->scp_nrqbds_posted);
2885 * If the number of threads has been tuned downward and this
2886 * thread should be stopped, then stop in reverse order so the
2887 * the threads always have contiguous thread index values.
2889 if (unlikely(ptlrpc_thread_should_stop(thread)))
2890 ptlrpc_thread_stop(thread);
2893 ptlrpc_watchdog_disable(&thread->t_watchdog);
2896 lu_context_fini(&env->le_ctx);
2902 /* deconstruct service thread state created by ptlrpc_start_thread() */
2903 if (svc->srv_ops.so_thr_done != NULL)
2904 svc->srv_ops.so_thr_done(thread);
2906 CDEBUG(D_RPCTRACE, "%s: service thread [%p:%u] %d exiting: rc = %d\n",
2907 thread->t_name, thread, thread->t_pid, thread->t_id, rc);
2908 spin_lock(&svcpt->scp_lock);
2909 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2910 svcpt->scp_nthrs_starting--;
2912 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2913 /* must know immediately */
2914 svcpt->scp_nthrs_running--;
2918 thread_add_flags(thread, SVC_STOPPED);
2920 wake_up(&thread->t_ctl_waitq);
2921 spin_unlock(&svcpt->scp_lock);
2926 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2927 struct list_head *replies)
2931 spin_lock(&hrt->hrt_lock);
2933 list_splice_init(&hrt->hrt_queue, replies);
2934 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2936 spin_unlock(&hrt->hrt_lock);
2941 * Main body of "handle reply" function.
2942 * It processes acked reply states
2944 static int ptlrpc_hr_main(void *arg)
2946 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2947 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2956 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2958 char threadname[20];
2960 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2961 hrp->hrp_cpt, hrt->hrt_id);
2962 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2963 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2966 rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD |
2967 LCT_REMEMBER | LCT_NOREF);
2971 rc = lu_env_add(env);
2973 GOTO(out_ctx_fini, rc);
2975 atomic_inc(&hrp->hrp_nstarted);
2976 wake_up(&ptlrpc_hr.hr_waitq);
2978 while (!ptlrpc_hr.hr_stopping) {
2979 wait_event_idle(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2981 while (!list_empty(&replies)) {
2982 struct ptlrpc_reply_state *rs;
2984 rs = list_entry(replies.prev,
2985 struct ptlrpc_reply_state,
2987 list_del_init(&rs->rs_list);
2988 /* refill keys if needed */
2990 lu_context_enter(&env->le_ctx);
2991 ptlrpc_handle_rs(rs);
2992 lu_context_exit(&env->le_ctx);
2996 atomic_inc(&hrp->hrp_nstopped);
2997 wake_up(&ptlrpc_hr.hr_waitq);
3001 lu_context_fini(&env->le_ctx);
3007 static void ptlrpc_stop_hr_threads(void)
3009 struct ptlrpc_hr_partition *hrp;
3013 ptlrpc_hr.hr_stopping = 1;
3015 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
3016 if (hrp->hrp_thrs == NULL)
3017 continue; /* uninitialized */
3018 for (j = 0; j < hrp->hrp_nthrs; j++)
3019 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
3022 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
3023 if (hrp->hrp_thrs == NULL)
3024 continue; /* uninitialized */
3025 wait_event(ptlrpc_hr.hr_waitq,
3026 atomic_read(&hrp->hrp_nstopped) ==
3027 atomic_read(&hrp->hrp_nstarted));
3031 static int ptlrpc_start_hr_threads(void)
3033 struct ptlrpc_hr_partition *hrp;
3039 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
3042 for (j = 0; j < hrp->hrp_nthrs; j++) {
3043 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
3044 struct task_struct *task;
3046 task = kthread_run(ptlrpc_hr_main,
3048 "ptlrpc_hr%02d_%03d",
3057 wait_event(ptlrpc_hr.hr_waitq,
3058 atomic_read(&hrp->hrp_nstarted) == j);
3061 CERROR("cannot start reply handler thread %d:%d: rc = %d\n",
3063 ptlrpc_stop_hr_threads();
3071 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
3073 struct ptlrpc_thread *thread;
3078 CDEBUG(D_INFO, "Stopping threads for service %s\n",
3079 svcpt->scp_service->srv_name);
3081 spin_lock(&svcpt->scp_lock);
3082 /* let the thread know that we would like it to stop asap */
3083 list_for_each_entry(thread, &svcpt->scp_threads, t_link)
3084 ptlrpc_stop_thread(thread);
3086 wake_up_all(&svcpt->scp_waitq);
3088 while (!list_empty(&svcpt->scp_threads)) {
3089 thread = list_entry(svcpt->scp_threads.next,
3090 struct ptlrpc_thread, t_link);
3091 if (thread_is_stopped(thread)) {
3092 list_move(&thread->t_link, &zombie);
3095 spin_unlock(&svcpt->scp_lock);
3097 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
3098 svcpt->scp_service->srv_thread_name, thread->t_id);
3099 wait_event_idle(thread->t_ctl_waitq,
3100 thread_is_stopped(thread));
3102 spin_lock(&svcpt->scp_lock);
3105 spin_unlock(&svcpt->scp_lock);
3107 while (!list_empty(&zombie)) {
3108 thread = list_entry(zombie.next,
3109 struct ptlrpc_thread, t_link);
3110 list_del(&thread->t_link);
3111 OBD_FREE_PTR(thread);
3117 * Stops all threads of a particular service \a svc
3119 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
3121 struct ptlrpc_service_part *svcpt;
3126 ptlrpc_service_for_each_part(svcpt, i, svc) {
3127 if (svcpt->scp_service != NULL)
3128 ptlrpc_svcpt_stop_threads(svcpt);
3134 int ptlrpc_start_threads(struct ptlrpc_service *svc)
3142 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
3143 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
3145 for (i = 0; i < svc->srv_ncpts; i++) {
3146 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
3147 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
3153 /* We have enough threads, don't start more. b=15759 */
3160 CERROR("cannot start %s thread #%d_%d: rc %d\n",
3161 svc->srv_thread_name, i, j, rc);
3162 ptlrpc_stop_all_threads(svc);
3166 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
3168 struct ptlrpc_thread *thread;
3169 struct ptlrpc_service *svc;
3170 struct task_struct *task;
3175 LASSERT(svcpt != NULL);
3177 svc = svcpt->scp_service;
3179 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
3180 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
3181 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
3184 if (unlikely(svc->srv_is_stopping))
3187 if (!ptlrpc_threads_increasable(svcpt) ||
3188 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
3189 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
3192 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
3195 init_waitqueue_head(&thread->t_ctl_waitq);
3197 spin_lock(&svcpt->scp_lock);
3198 if (!ptlrpc_threads_increasable(svcpt)) {
3199 spin_unlock(&svcpt->scp_lock);
3200 OBD_FREE_PTR(thread);
3204 if (svcpt->scp_nthrs_starting != 0) {
3206 * serialize starting because some modules (obdfilter)
3207 * might require unique and contiguous t_id
3209 LASSERT(svcpt->scp_nthrs_starting == 1);
3210 spin_unlock(&svcpt->scp_lock);
3211 OBD_FREE_PTR(thread);
3213 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
3214 svc->srv_thread_name, svcpt->scp_thr_nextid);
3219 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
3220 svc->srv_thread_name, svcpt->scp_thr_nextid);
3224 svcpt->scp_nthrs_starting++;
3225 thread->t_id = svcpt->scp_thr_nextid++;
3226 thread_add_flags(thread, SVC_STARTING);
3227 thread->t_svcpt = svcpt;
3229 list_add(&thread->t_link, &svcpt->scp_threads);
3230 spin_unlock(&svcpt->scp_lock);
3232 if (svcpt->scp_cpt >= 0) {
3233 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s%02d_%03d",
3234 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
3236 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s_%04d",
3237 svc->srv_thread_name, thread->t_id);
3240 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
3241 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
3244 CERROR("cannot start thread '%s': rc = %d\n",
3245 thread->t_name, rc);
3246 spin_lock(&svcpt->scp_lock);
3247 --svcpt->scp_nthrs_starting;
3248 if (thread_is_stopping(thread)) {
3250 * this ptlrpc_thread is being hanled
3251 * by ptlrpc_svcpt_stop_threads now
3253 thread_add_flags(thread, SVC_STOPPED);
3254 wake_up(&thread->t_ctl_waitq);
3255 spin_unlock(&svcpt->scp_lock);
3257 list_del(&thread->t_link);
3258 spin_unlock(&svcpt->scp_lock);
3259 OBD_FREE_PTR(thread);
3267 wait_event_idle(thread->t_ctl_waitq,
3268 thread_is_running(thread) || thread_is_stopped(thread));
3270 rc = thread_is_stopped(thread) ? thread->t_id : 0;
3274 int ptlrpc_hr_init(void)
3276 struct ptlrpc_hr_partition *hrp;
3277 struct ptlrpc_hr_thread *hrt;
3285 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
3286 ptlrpc_hr.hr_cpt_table = cfs_cpt_tab;
3288 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
3290 if (ptlrpc_hr.hr_partitions == NULL)
3293 ratelimit_state_init(&watchdog_limit,
3294 cfs_time_seconds(libcfs_watchdog_ratelimit), 3);
3296 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
3299 weight = cpumask_weight(topology_sibling_cpumask(smp_processor_id()));
3302 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3305 atomic_set(&hrp->hrp_nstarted, 0);
3306 atomic_set(&hrp->hrp_nstopped, 0);
3308 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, cpt);
3309 hrp->hrp_nthrs /= weight;
3310 if (hrp->hrp_nthrs == 0)
3313 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, cpt,
3314 hrp->hrp_nthrs * sizeof(*hrt));
3315 if (hrp->hrp_thrs == NULL)
3316 GOTO(out, rc = -ENOMEM);
3318 for (i = 0; i < hrp->hrp_nthrs; i++) {
3319 hrt = &hrp->hrp_thrs[i];
3322 hrt->hrt_partition = hrp;
3323 init_waitqueue_head(&hrt->hrt_waitq);
3324 spin_lock_init(&hrt->hrt_lock);
3325 INIT_LIST_HEAD(&hrt->hrt_queue);
3329 rc = ptlrpc_start_hr_threads();
3336 void ptlrpc_hr_fini(void)
3338 struct ptlrpc_hr_partition *hrp;
3341 if (ptlrpc_hr.hr_partitions == NULL)
3344 ptlrpc_stop_hr_threads();
3346 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3348 OBD_FREE_PTR_ARRAY(hrp->hrp_thrs, hrp->hrp_nthrs);
3351 cfs_percpt_free(ptlrpc_hr.hr_partitions);
3352 ptlrpc_hr.hr_partitions = NULL;
3357 * Wait until all already scheduled replies are processed.
3359 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
3362 if (wait_event_idle_timeout(
3364 atomic_read(&svcpt->scp_nreps_difficult) == 0,
3365 cfs_time_seconds(10)) > 0)
3367 CWARN("Unexpectedly long timeout %s %p\n",
3368 svcpt->scp_service->srv_name, svcpt->scp_service);
3373 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
3375 struct ptlrpc_service_part *svcpt;
3378 /* early disarm AT timer... */
3379 ptlrpc_service_for_each_part(svcpt, i, svc) {
3380 if (svcpt->scp_service != NULL)
3381 del_timer(&svcpt->scp_at_timer);
3386 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
3388 struct ptlrpc_service_part *svcpt;
3389 struct ptlrpc_request_buffer_desc *rqbd;
3394 * All history will be culled when the next request buffer is
3395 * freed in ptlrpc_service_purge_all()
3397 svc->srv_hist_nrqbds_cpt_max = 0;
3399 rc = LNetClearLazyPortal(svc->srv_req_portal);
3402 ptlrpc_service_for_each_part(svcpt, i, svc) {
3403 if (svcpt->scp_service == NULL)
3407 * Unlink all the request buffers. This forces a 'final'
3408 * event with its 'unlink' flag set for each posted rqbd
3410 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
3412 rc = LNetMDUnlink(rqbd->rqbd_md_h);
3413 LASSERT(rc == 0 || rc == -ENOENT);
3417 ptlrpc_service_for_each_part(svcpt, i, svc) {
3418 if (svcpt->scp_service == NULL)
3422 * Wait for the network to release any buffers
3423 * it's currently filling
3425 spin_lock(&svcpt->scp_lock);
3426 while (svcpt->scp_nrqbds_posted != 0) {
3427 int seconds = PTLRPC_REQ_LONG_UNLINK;
3429 spin_unlock(&svcpt->scp_lock);
3431 * Network access will complete in finite time but
3432 * the HUGE timeout lets us CWARN for visibility
3435 while (seconds > 0 &&
3436 wait_event_idle_timeout(
3438 svcpt->scp_nrqbds_posted == 0,
3439 cfs_time_seconds(1)) == 0)
3442 CWARN("Service %s waiting for request buffers\n",
3443 svcpt->scp_service->srv_name);
3445 spin_lock(&svcpt->scp_lock);
3447 spin_unlock(&svcpt->scp_lock);
3452 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
3454 struct ptlrpc_service_part *svcpt;
3455 struct ptlrpc_request_buffer_desc *rqbd;
3456 struct ptlrpc_request *req;
3457 struct ptlrpc_reply_state *rs;
3460 ptlrpc_service_for_each_part(svcpt, i, svc) {
3461 if (svcpt->scp_service == NULL)
3464 spin_lock(&svcpt->scp_rep_lock);
3465 while (!list_empty(&svcpt->scp_rep_active)) {
3466 rs = list_entry(svcpt->scp_rep_active.next,
3467 struct ptlrpc_reply_state, rs_list);
3468 spin_lock(&rs->rs_lock);
3469 ptlrpc_schedule_difficult_reply(rs);
3470 spin_unlock(&rs->rs_lock);
3472 spin_unlock(&svcpt->scp_rep_lock);
3475 * purge the request queue. NB No new replies (rqbds
3476 * all unlinked) and no service threads, so I'm the only
3477 * thread noodling the request queue now
3479 while (!list_empty(&svcpt->scp_req_incoming)) {
3480 req = list_entry(svcpt->scp_req_incoming.next,
3481 struct ptlrpc_request, rq_list);
3483 list_del(&req->rq_list);
3484 svcpt->scp_nreqs_incoming--;
3485 ptlrpc_server_finish_request(svcpt, req);
3488 while (ptlrpc_server_request_pending(svcpt, true)) {
3489 req = ptlrpc_server_request_get(svcpt, true);
3490 ptlrpc_server_finish_active_request(svcpt, req);
3493 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
3494 LASSERT(svcpt->scp_nreqs_incoming == 0);
3495 LASSERT(svcpt->scp_nreqs_active == 0);
3497 * history should have been culled by
3498 * ptlrpc_server_finish_request
3500 LASSERT(svcpt->scp_hist_nrqbds == 0);
3503 * Now free all the request buffers since nothing
3504 * references them any more...
3507 while (!list_empty(&svcpt->scp_rqbd_idle)) {
3508 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
3509 struct ptlrpc_request_buffer_desc,
3511 ptlrpc_free_rqbd(rqbd);
3513 ptlrpc_wait_replies(svcpt);
3515 while (!list_empty(&svcpt->scp_rep_idle)) {
3516 rs = list_entry(svcpt->scp_rep_idle.next,
3517 struct ptlrpc_reply_state,
3519 list_del(&rs->rs_list);
3520 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
3526 ptlrpc_service_free(struct ptlrpc_service *svc)
3528 struct ptlrpc_service_part *svcpt;
3529 struct ptlrpc_at_array *array;
3532 ptlrpc_service_for_each_part(svcpt, i, svc) {
3533 if (svcpt->scp_service == NULL)
3536 /* In case somebody rearmed this in the meantime */
3537 del_timer(&svcpt->scp_at_timer);
3538 array = &svcpt->scp_at_array;
3540 if (array->paa_reqs_array != NULL) {
3541 OBD_FREE_PTR_ARRAY(array->paa_reqs_array,
3543 array->paa_reqs_array = NULL;
3546 if (array->paa_reqs_count != NULL) {
3547 OBD_FREE_PTR_ARRAY(array->paa_reqs_count,
3549 array->paa_reqs_count = NULL;
3553 ptlrpc_service_for_each_part(svcpt, i, svc)
3554 OBD_FREE_PTR(svcpt);
3556 if (svc->srv_cpts != NULL)
3557 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3559 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3560 srv_parts[svc->srv_ncpts]));
3563 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3567 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3569 service->srv_is_stopping = 1;
3571 mutex_lock(&ptlrpc_all_services_mutex);
3572 list_del_init(&service->srv_list);
3573 mutex_unlock(&ptlrpc_all_services_mutex);
3575 ptlrpc_service_del_atimer(service);
3576 ptlrpc_stop_all_threads(service);
3578 ptlrpc_service_unlink_rqbd(service);
3579 ptlrpc_service_purge_all(service);
3580 ptlrpc_service_nrs_cleanup(service);
3582 ptlrpc_lprocfs_unregister_service(service);
3583 ptlrpc_sysfs_unregister_service(service);
3585 ptlrpc_service_free(service);
3589 EXPORT_SYMBOL(ptlrpc_unregister_service);
3592 * Returns 0 if the service is healthy.
3594 * Right now, it just checks to make sure that requests aren't languishing
3595 * in the queue. We'll use this health check to govern whether a node needs
3596 * to be shot, so it's intentionally non-aggressive.
3598 static int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3600 struct ptlrpc_request *request = NULL;
3601 struct timespec64 right_now;
3602 struct timespec64 timediff;
3604 ktime_get_real_ts64(&right_now);
3606 spin_lock(&svcpt->scp_req_lock);
3607 /* How long has the next entry been waiting? */
3608 if (ptlrpc_server_high_pending(svcpt, true))
3609 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3610 else if (ptlrpc_server_normal_pending(svcpt, true))
3611 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3613 if (request == NULL) {
3614 spin_unlock(&svcpt->scp_req_lock);
3618 timediff = timespec64_sub(right_now, request->rq_arrival_time);
3619 spin_unlock(&svcpt->scp_req_lock);
3621 if ((timediff.tv_sec) >
3622 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3623 CERROR("%s: unhealthy - request has been waiting %llds\n",
3624 svcpt->scp_service->srv_name, (s64)timediff.tv_sec);
3632 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3634 struct ptlrpc_service_part *svcpt;
3640 ptlrpc_service_for_each_part(svcpt, i, svc) {
3641 int rc = ptlrpc_svcpt_health_check(svcpt);
3648 EXPORT_SYMBOL(ptlrpc_service_health_check);