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"
45 /* The following are visible and mutable through /sys/module/ptlrpc */
46 int test_req_buffer_pressure = 0;
47 module_param(test_req_buffer_pressure, int, 0444);
48 MODULE_PARM_DESC(test_req_buffer_pressure, "set non-zero to put pressure on request buffer pools");
49 module_param(at_min, int, 0644);
50 MODULE_PARM_DESC(at_min, "Adaptive timeout minimum (sec)");
51 module_param(at_max, int, 0644);
52 MODULE_PARM_DESC(at_max, "Adaptive timeout maximum (sec)");
53 module_param(at_history, int, 0644);
54 MODULE_PARM_DESC(at_history,
55 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
56 module_param(at_early_margin, int, 0644);
57 MODULE_PARM_DESC(at_early_margin, "How soon before an RPC deadline to send an early reply");
58 module_param(at_extra, int, 0644);
59 MODULE_PARM_DESC(at_extra, "How much extra time to give with each early reply");
62 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt);
63 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req);
64 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req);
66 /** Holds a list of all PTLRPC services */
67 struct list_head ptlrpc_all_services;
68 /** Used to protect the \e ptlrpc_all_services list */
69 struct mutex ptlrpc_all_services_mutex;
71 static struct ptlrpc_request_buffer_desc *
72 ptlrpc_alloc_rqbd(struct ptlrpc_service_part *svcpt)
74 struct ptlrpc_service *svc = svcpt->scp_service;
75 struct ptlrpc_request_buffer_desc *rqbd;
77 OBD_CPT_ALLOC_PTR(rqbd, svc->srv_cptable, svcpt->scp_cpt);
81 rqbd->rqbd_svcpt = svcpt;
82 rqbd->rqbd_refcount = 0;
83 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
84 rqbd->rqbd_cbid.cbid_arg = rqbd;
85 INIT_LIST_HEAD(&rqbd->rqbd_reqs);
86 OBD_CPT_ALLOC_LARGE(rqbd->rqbd_buffer, svc->srv_cptable,
87 svcpt->scp_cpt, svc->srv_buf_size);
88 if (rqbd->rqbd_buffer == NULL) {
93 spin_lock(&svcpt->scp_lock);
94 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
95 svcpt->scp_nrqbds_total++;
96 spin_unlock(&svcpt->scp_lock);
101 static void ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
103 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
105 LASSERT(rqbd->rqbd_refcount == 0);
106 LASSERT(list_empty(&rqbd->rqbd_reqs));
108 spin_lock(&svcpt->scp_lock);
109 list_del(&rqbd->rqbd_list);
110 svcpt->scp_nrqbds_total--;
111 spin_unlock(&svcpt->scp_lock);
113 OBD_FREE_LARGE(rqbd->rqbd_buffer, svcpt->scp_service->srv_buf_size);
117 static int ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
119 struct ptlrpc_service *svc = svcpt->scp_service;
120 struct ptlrpc_request_buffer_desc *rqbd;
124 if (svcpt->scp_rqbd_allocating)
127 spin_lock(&svcpt->scp_lock);
128 /* check again with lock */
129 if (svcpt->scp_rqbd_allocating) {
130 /* NB: we might allow more than one thread in the future */
131 LASSERT(svcpt->scp_rqbd_allocating == 1);
132 spin_unlock(&svcpt->scp_lock);
136 svcpt->scp_rqbd_allocating++;
137 spin_unlock(&svcpt->scp_lock);
140 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
142 * NB: another thread might have recycled enough rqbds, we
143 * need to make sure it wouldn't over-allocate, see LU-1212.
145 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group ||
146 (svc->srv_nrqbds_max != 0 &&
147 svcpt->scp_nrqbds_total > svc->srv_nrqbds_max))
150 rqbd = ptlrpc_alloc_rqbd(svcpt);
153 CERROR("%s: Can't allocate request buffer\n",
160 spin_lock(&svcpt->scp_lock);
162 LASSERT(svcpt->scp_rqbd_allocating == 1);
163 svcpt->scp_rqbd_allocating--;
165 spin_unlock(&svcpt->scp_lock);
168 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
169 svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted,
170 svcpt->scp_nrqbds_total, rc);
174 rc = ptlrpc_server_post_idle_rqbds(svcpt);
180 * Part of Rep-Ack logic.
181 * Puts a lock and its mode into reply state assotiated to request reply.
183 void ptlrpc_save_lock(struct ptlrpc_request *req, struct lustre_handle *lock,
184 int mode, bool no_ack, bool convert_lock)
186 struct ptlrpc_reply_state *rs = req->rq_reply_state;
190 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
192 idx = rs->rs_nlocks++;
193 rs->rs_locks[idx] = *lock;
194 rs->rs_modes[idx] = mode;
195 rs->rs_difficult = 1;
196 rs->rs_no_ack = no_ack;
197 rs->rs_convert_lock = convert_lock;
199 EXPORT_SYMBOL(ptlrpc_save_lock);
202 struct ptlrpc_hr_partition;
204 struct ptlrpc_hr_thread {
205 int hrt_id; /* thread ID */
207 wait_queue_head_t hrt_waitq;
208 struct list_head hrt_queue;
209 struct ptlrpc_hr_partition *hrt_partition;
212 struct ptlrpc_hr_partition {
213 /* # of started threads */
214 atomic_t hrp_nstarted;
215 /* # of stopped threads */
216 atomic_t hrp_nstopped;
217 /* cpu partition id */
219 /* round-robin rotor for choosing thread */
221 /* total number of threads on this partition */
224 struct ptlrpc_hr_thread *hrp_thrs;
227 #define HRT_RUNNING 0
228 #define HRT_STOPPING 1
230 struct ptlrpc_hr_service {
231 /* CPU partition table, it's just cfs_cpt_table for now */
232 struct cfs_cpt_table *hr_cpt_table;
233 /** controller sleep waitq */
234 wait_queue_head_t hr_waitq;
235 unsigned int hr_stopping;
236 /** roundrobin rotor for non-affinity service */
237 unsigned int hr_rotor;
239 struct ptlrpc_hr_partition **hr_partitions;
243 struct list_head rsb_replies;
244 unsigned int rsb_n_replies;
245 struct ptlrpc_service_part *rsb_svcpt;
248 /** reply handling service. */
249 static struct ptlrpc_hr_service ptlrpc_hr;
252 * maximum mumber of replies scheduled in one batch
254 #define MAX_SCHEDULED 256
257 * Initialize a reply batch.
261 static void rs_batch_init(struct rs_batch *b)
263 memset(b, 0, sizeof(*b));
264 INIT_LIST_HEAD(&b->rsb_replies);
268 * Choose an hr thread to dispatch requests to.
271 struct ptlrpc_hr_thread *ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
273 struct ptlrpc_hr_partition *hrp;
276 if (svcpt->scp_cpt >= 0 &&
277 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
278 /* directly match partition */
279 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
282 rotor = ptlrpc_hr.hr_rotor++;
283 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
285 hrp = ptlrpc_hr.hr_partitions[rotor];
288 rotor = hrp->hrp_rotor++;
289 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
293 * Dispatch all replies accumulated in the batch to one from
294 * dedicated reply handling threads.
298 static void rs_batch_dispatch(struct rs_batch *b)
300 if (b->rsb_n_replies != 0) {
301 struct ptlrpc_hr_thread *hrt;
303 hrt = ptlrpc_hr_select(b->rsb_svcpt);
305 spin_lock(&hrt->hrt_lock);
306 list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
307 spin_unlock(&hrt->hrt_lock);
309 wake_up(&hrt->hrt_waitq);
310 b->rsb_n_replies = 0;
315 * Add a reply to a batch.
316 * Add one reply object to a batch, schedule batched replies if overload.
321 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
323 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
325 if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
326 if (b->rsb_svcpt != NULL) {
327 rs_batch_dispatch(b);
328 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
330 spin_lock(&svcpt->scp_rep_lock);
331 b->rsb_svcpt = svcpt;
333 spin_lock(&rs->rs_lock);
334 rs->rs_scheduled_ever = 1;
335 if (rs->rs_scheduled == 0) {
336 list_move(&rs->rs_list, &b->rsb_replies);
337 rs->rs_scheduled = 1;
340 rs->rs_committed = 1;
341 spin_unlock(&rs->rs_lock);
345 * Reply batch finalization.
346 * Dispatch remaining replies from the batch
347 * and release remaining spinlock.
351 static void rs_batch_fini(struct rs_batch *b)
353 if (b->rsb_svcpt != NULL) {
354 rs_batch_dispatch(b);
355 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
359 #define DECLARE_RS_BATCH(b) struct rs_batch b
363 * Put reply state into a queue for processing because we received
364 * ACK from the client
366 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
368 struct ptlrpc_hr_thread *hrt;
372 LASSERT(list_empty(&rs->rs_list));
374 hrt = ptlrpc_hr_select(rs->rs_svcpt);
376 spin_lock(&hrt->hrt_lock);
377 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
378 spin_unlock(&hrt->hrt_lock);
380 wake_up(&hrt->hrt_waitq);
384 void ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
388 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
389 assert_spin_locked(&rs->rs_lock);
390 LASSERT(rs->rs_difficult);
391 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
393 if (rs->rs_scheduled) { /* being set up or already notified */
398 rs->rs_scheduled = 1;
399 list_del_init(&rs->rs_list);
400 ptlrpc_dispatch_difficult_reply(rs);
403 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
405 void ptlrpc_commit_replies(struct obd_export *exp)
407 struct ptlrpc_reply_state *rs, *nxt;
408 DECLARE_RS_BATCH(batch);
412 rs_batch_init(&batch);
414 * Find any replies that have been committed and get their service
415 * to attend to complete them.
418 /* CAVEAT EMPTOR: spinlock ordering!!! */
419 spin_lock(&exp->exp_uncommitted_replies_lock);
420 list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
422 LASSERT(rs->rs_difficult);
423 /* VBR: per-export last_committed */
424 LASSERT(rs->rs_export);
425 if (rs->rs_transno <= exp->exp_last_committed) {
426 list_del_init(&rs->rs_obd_list);
427 rs_batch_add(&batch, rs);
430 spin_unlock(&exp->exp_uncommitted_replies_lock);
431 rs_batch_fini(&batch);
435 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
437 struct ptlrpc_request_buffer_desc *rqbd;
442 spin_lock(&svcpt->scp_lock);
444 if (list_empty(&svcpt->scp_rqbd_idle)) {
445 spin_unlock(&svcpt->scp_lock);
449 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
450 struct ptlrpc_request_buffer_desc,
453 /* assume we will post successfully */
454 svcpt->scp_nrqbds_posted++;
455 list_move(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
457 spin_unlock(&svcpt->scp_lock);
459 rc = ptlrpc_register_rqbd(rqbd);
466 spin_lock(&svcpt->scp_lock);
468 svcpt->scp_nrqbds_posted--;
469 list_move_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
472 * Don't complain if no request buffers are posted right now; LNET
473 * won't drop requests because we set the portal lazy!
476 spin_unlock(&svcpt->scp_lock);
481 static void ptlrpc_at_timer(cfs_timer_cb_arg_t data)
483 struct ptlrpc_service_part *svcpt;
485 svcpt = cfs_from_timer(svcpt, data, scp_at_timer);
487 svcpt->scp_at_check = 1;
488 svcpt->scp_at_checktime = ktime_get();
489 wake_up(&svcpt->scp_waitq);
492 static void ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
493 struct ptlrpc_service_conf *conf)
495 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
502 * Common code for estimating & validating threads number.
503 * CPT affinity service could have percpt thread-pool instead
504 * of a global thread-pool, which means user might not always
505 * get the threads number they give it in conf::tc_nthrs_user
506 * even they did set. It's because we need to validate threads
507 * number for each CPT to guarantee each pool will have enough
508 * threads to keep the service healthy.
510 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
511 init = max_t(int, init, tc->tc_nthrs_init);
514 * NB: please see comments in lustre_lnet.h for definition
515 * details of these members
517 LASSERT(tc->tc_nthrs_max != 0);
519 if (tc->tc_nthrs_user != 0) {
521 * In case there is a reason to test a service with many
522 * threads, we give a less strict check here, it can
523 * be up to 8 * nthrs_max
525 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
526 nthrs = total / svc->srv_ncpts;
527 init = max(init, nthrs);
531 total = tc->tc_nthrs_max;
532 if (tc->tc_nthrs_base == 0) {
534 * don't care about base threads number per partition,
535 * this is most for non-affinity service
537 nthrs = total / svc->srv_ncpts;
541 nthrs = tc->tc_nthrs_base;
542 if (svc->srv_ncpts == 1) {
546 * NB: Increase the base number if it's single partition
547 * and total number of cores/HTs is larger or equal to 4.
548 * result will always < 2 * nthrs_base
550 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
551 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
552 (tc->tc_nthrs_base >> i) != 0; i++)
553 nthrs += tc->tc_nthrs_base >> i;
556 if (tc->tc_thr_factor != 0) {
557 int factor = tc->tc_thr_factor;
561 * User wants to increase number of threads with for
562 * each CPU core/HT, most likely the factor is larger than
563 * one thread/core because service threads are supposed to
564 * be blocked by lock or wait for IO.
567 * Amdahl's law says that adding processors wouldn't give
568 * a linear increasing of parallelism, so it's nonsense to
569 * have too many threads no matter how many cores/HTs
574 (topology_sibling_cpumask(smp_processor_id())) > 1) {
575 /* weight is # of HTs */
576 /* depress thread factor for hyper-thread */
577 factor = factor - (factor >> 1) + (factor >> 3);
581 weight = cfs_cpt_weight(svc->srv_cptable, 0);
583 for (; factor > 0 && weight > 0; factor--, weight -= fade)
584 nthrs += min(weight, fade) * factor;
587 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
588 nthrs = max(tc->tc_nthrs_base,
589 tc->tc_nthrs_max / svc->srv_ncpts);
592 nthrs = max(nthrs, tc->tc_nthrs_init);
593 svc->srv_nthrs_cpt_limit = nthrs;
594 svc->srv_nthrs_cpt_init = init;
596 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
598 "%s: This service may have more threads (%d) than the given soft limit (%d)\n",
599 svc->srv_name, nthrs * svc->srv_ncpts,
605 * Initialize percpt data for a service
607 static int ptlrpc_service_part_init(struct ptlrpc_service *svc,
608 struct ptlrpc_service_part *svcpt, int cpt)
610 struct ptlrpc_at_array *array;
615 svcpt->scp_cpt = cpt;
616 INIT_LIST_HEAD(&svcpt->scp_threads);
618 /* rqbd and incoming request queue */
619 spin_lock_init(&svcpt->scp_lock);
620 mutex_init(&svcpt->scp_mutex);
621 INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
622 INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
623 INIT_LIST_HEAD(&svcpt->scp_req_incoming);
624 init_waitqueue_head(&svcpt->scp_waitq);
625 /* history request & rqbd list */
626 INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
627 INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
629 /* acitve requests and hp requests */
630 spin_lock_init(&svcpt->scp_req_lock);
633 spin_lock_init(&svcpt->scp_rep_lock);
634 INIT_LIST_HEAD(&svcpt->scp_rep_active);
635 INIT_LIST_HEAD(&svcpt->scp_rep_idle);
636 init_waitqueue_head(&svcpt->scp_rep_waitq);
637 atomic_set(&svcpt->scp_nreps_difficult, 0);
639 /* adaptive timeout */
640 spin_lock_init(&svcpt->scp_at_lock);
641 array = &svcpt->scp_at_array;
643 size = at_est2timeout(at_max);
644 array->paa_size = size;
645 array->paa_count = 0;
646 array->paa_deadline = -1;
648 /* allocate memory for scp_at_array (ptlrpc_at_array) */
649 OBD_CPT_ALLOC(array->paa_reqs_array,
650 svc->srv_cptable, cpt, sizeof(struct list_head) * size);
651 if (array->paa_reqs_array == NULL)
654 for (index = 0; index < size; index++)
655 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
657 OBD_CPT_ALLOC(array->paa_reqs_count,
658 svc->srv_cptable, cpt, sizeof(__u32) * size);
659 if (array->paa_reqs_count == NULL)
662 cfs_timer_setup(&svcpt->scp_at_timer, ptlrpc_at_timer,
663 (unsigned long)svcpt, 0);
666 * At SOW, service time should be quick; 10s seems generous. If client
667 * timeout is less than this, we'll be sending an early reply.
669 at_init(&svcpt->scp_at_estimate, 10, 0);
671 /* assign this before call ptlrpc_grow_req_bufs */
672 svcpt->scp_service = svc;
673 /* Now allocate the request buffers, but don't post them now */
674 rc = ptlrpc_grow_req_bufs(svcpt, 0);
676 * We shouldn't be under memory pressure at startup, so
677 * fail if we can't allocate all our buffers at this time.
685 if (array->paa_reqs_count != NULL) {
686 OBD_FREE(array->paa_reqs_count, sizeof(__u32) * size);
687 array->paa_reqs_count = NULL;
690 if (array->paa_reqs_array != NULL) {
691 OBD_FREE(array->paa_reqs_array,
692 sizeof(struct list_head) * 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_table;
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(cpts, sizeof(*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(cpts, sizeof(*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 /** Change request export and move hp request from old export to new */
1028 void ptlrpc_request_change_export(struct ptlrpc_request *req,
1029 struct obd_export *export)
1031 if (req->rq_export != NULL) {
1032 LASSERT(!list_empty(&req->rq_exp_list));
1033 /* remove rq_exp_list from last export */
1034 spin_lock(&req->rq_export->exp_rpc_lock);
1035 list_del_init(&req->rq_exp_list);
1036 spin_unlock(&req->rq_export->exp_rpc_lock);
1038 * export has one reference already, so it`s safe to
1039 * add req to export queue here and get another
1040 * reference for request later
1042 spin_lock(&export->exp_rpc_lock);
1043 if (req->rq_ops != NULL) /* hp request */
1044 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
1046 list_add(&req->rq_exp_list, &export->exp_reg_rpcs);
1047 spin_unlock(&export->exp_rpc_lock);
1049 class_export_rpc_dec(req->rq_export);
1050 class_export_put(req->rq_export);
1053 /* request takes one export refcount */
1054 req->rq_export = class_export_get(export);
1055 class_export_rpc_inc(export);
1061 * to finish a request: stop sending more early replies, and release
1064 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
1065 struct ptlrpc_request *req)
1067 ptlrpc_server_hpreq_fini(req);
1069 ptlrpc_server_drop_request(req);
1073 * to finish an active request: stop sending more early replies, and release
1074 * the request. should be called after we finished handling the request.
1076 static void ptlrpc_server_finish_active_request(
1077 struct ptlrpc_service_part *svcpt,
1078 struct ptlrpc_request *req)
1080 spin_lock(&svcpt->scp_req_lock);
1081 ptlrpc_nrs_req_stop_nolock(req);
1082 svcpt->scp_nreqs_active--;
1084 svcpt->scp_nhreqs_active--;
1085 spin_unlock(&svcpt->scp_req_lock);
1087 ptlrpc_nrs_req_finalize(req);
1089 if (req->rq_export != NULL)
1090 class_export_rpc_dec(req->rq_export);
1092 ptlrpc_server_finish_request(svcpt, req);
1096 * This function makes sure dead exports are evicted in a timely manner.
1097 * This function is only called when some export receives a message (i.e.,
1098 * the network is up.)
1100 void ptlrpc_update_export_timer(struct obd_export *exp, time64_t extra_delay)
1102 struct obd_export *oldest_exp;
1103 time64_t oldest_time, new_time;
1110 * Compensate for slow machines, etc, by faking our request time
1111 * into the future. Although this can break the strict time-ordering
1112 * of the list, we can be really lazy here - we don't have to evict
1113 * at the exact right moment. Eventually, all silent exports
1114 * will make it to the top of the list.
1117 /* Do not pay attention on 1sec or smaller renewals. */
1118 new_time = ktime_get_real_seconds() + extra_delay;
1119 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1122 exp->exp_last_request_time = new_time;
1125 * exports may get disconnected from the chain even though the
1126 * export has references, so we must keep the spin lock while
1127 * manipulating the lists
1129 spin_lock(&exp->exp_obd->obd_dev_lock);
1131 if (list_empty(&exp->exp_obd_chain_timed)) {
1132 /* this one is not timed */
1133 spin_unlock(&exp->exp_obd->obd_dev_lock);
1137 list_move_tail(&exp->exp_obd_chain_timed,
1138 &exp->exp_obd->obd_exports_timed);
1140 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1141 struct obd_export, exp_obd_chain_timed);
1142 oldest_time = oldest_exp->exp_last_request_time;
1143 spin_unlock(&exp->exp_obd->obd_dev_lock);
1145 if (exp->exp_obd->obd_recovering) {
1146 /* be nice to everyone during recovery */
1151 /* Note - racing to start/reset the obd_eviction timer is safe */
1152 if (exp->exp_obd->obd_eviction_timer == 0) {
1153 /* Check if the oldest entry is expired. */
1154 if (ktime_get_real_seconds() >
1155 oldest_time + PING_EVICT_TIMEOUT + extra_delay) {
1157 * We need a second timer, in case the net was down and
1158 * it just came back. Since the pinger may skip every
1159 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1160 * we better wait for 3.
1162 exp->exp_obd->obd_eviction_timer =
1163 ktime_get_real_seconds() + 3 * PING_INTERVAL;
1164 CDEBUG(D_HA, "%s: Think about evicting %s from %lld\n",
1165 exp->exp_obd->obd_name,
1166 obd_export_nid2str(oldest_exp), oldest_time);
1169 if (ktime_get_real_seconds() >
1170 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1172 * The evictor won't evict anyone who we've heard from
1173 * recently, so we don't have to check before we start
1176 if (!ping_evictor_wake(exp))
1177 exp->exp_obd->obd_eviction_timer = 0;
1185 * Sanity check request \a req.
1186 * Return 0 if all is ok, error code otherwise.
1188 static int ptlrpc_check_req(struct ptlrpc_request *req)
1190 struct obd_device *obd = req->rq_export->exp_obd;
1193 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1194 req->rq_export->exp_conn_cnt)) {
1195 DEBUG_REQ(D_RPCTRACE, req,
1196 "DROPPING req from old connection %d < %d",
1197 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1198 req->rq_export->exp_conn_cnt);
1201 if (unlikely(obd == NULL || obd->obd_fail)) {
1203 * Failing over, don't handle any more reqs,
1204 * send error response instead.
1206 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1207 req, (obd != NULL) ? obd->obd_name : "unknown");
1209 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1210 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1211 !obd->obd_recovering) {
1212 DEBUG_REQ(D_ERROR, req,
1213 "Invalid replay without recovery");
1214 class_fail_export(req->rq_export);
1216 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1217 !obd->obd_recovering) {
1218 DEBUG_REQ(D_ERROR, req,
1219 "Invalid req with transno %llu without recovery",
1220 lustre_msg_get_transno(req->rq_reqmsg));
1221 class_fail_export(req->rq_export);
1225 if (unlikely(rc < 0)) {
1226 req->rq_status = rc;
1232 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1234 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1237 if (array->paa_count == 0) {
1238 del_timer(&svcpt->scp_at_timer);
1242 /* Set timer for closest deadline */
1243 next = array->paa_deadline - ktime_get_real_seconds() -
1246 ptlrpc_at_timer(cfs_timer_cb_arg(svcpt, scp_at_timer));
1248 mod_timer(&svcpt->scp_at_timer,
1249 jiffies + nsecs_to_jiffies(next * NSEC_PER_SEC));
1250 CDEBUG(D_INFO, "armed %s at %+llds\n",
1251 svcpt->scp_service->srv_name, next);
1255 /* Add rpc to early reply check list */
1256 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1258 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1259 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1260 struct ptlrpc_request *rq = NULL;
1266 if (req->rq_no_reply)
1269 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1272 spin_lock(&svcpt->scp_at_lock);
1273 LASSERT(list_empty(&req->rq_timed_list));
1275 div_u64_rem(req->rq_deadline, array->paa_size, &index);
1276 if (array->paa_reqs_count[index] > 0) {
1278 * latest rpcs will have the latest deadlines in the list,
1279 * so search backward.
1281 list_for_each_entry_reverse(rq, &array->paa_reqs_array[index],
1283 if (req->rq_deadline >= rq->rq_deadline) {
1284 list_add(&req->rq_timed_list,
1285 &rq->rq_timed_list);
1291 /* Add the request at the head of the list */
1292 if (list_empty(&req->rq_timed_list))
1293 list_add(&req->rq_timed_list, &array->paa_reqs_array[index]);
1295 spin_lock(&req->rq_lock);
1296 req->rq_at_linked = 1;
1297 spin_unlock(&req->rq_lock);
1298 req->rq_at_index = index;
1299 array->paa_reqs_count[index]++;
1301 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1302 array->paa_deadline = req->rq_deadline;
1303 ptlrpc_at_set_timer(svcpt);
1305 spin_unlock(&svcpt->scp_at_lock);
1310 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1312 struct ptlrpc_at_array *array;
1314 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1316 /* NB: must call with hold svcpt::scp_at_lock */
1317 LASSERT(!list_empty(&req->rq_timed_list));
1318 list_del_init(&req->rq_timed_list);
1320 spin_lock(&req->rq_lock);
1321 req->rq_at_linked = 0;
1322 spin_unlock(&req->rq_lock);
1324 array->paa_reqs_count[req->rq_at_index]--;
1329 * Attempt to extend the request deadline by sending an early reply to the
1332 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1334 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1335 struct ptlrpc_request *reqcopy;
1336 struct lustre_msg *reqmsg;
1337 time64_t olddl = req->rq_deadline - ktime_get_real_seconds();
1343 if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_RECONNECT)) {
1344 /* don't send early reply */
1349 * deadline is when the client expects us to reply, margin is the
1350 * difference between clients' and servers' expectations
1352 DEBUG_REQ(D_ADAPTTO, req,
1353 "%ssending early reply (deadline %+llds, margin %+llds) for %d+%d",
1354 AT_OFF ? "AT off - not " : "",
1355 (s64)olddl, (s64)(olddl - at_get(&svcpt->scp_at_estimate)),
1356 at_get(&svcpt->scp_at_estimate), at_extra);
1362 /* below message is checked in replay-ost-single.sh test_9 */
1363 DEBUG_REQ(D_WARNING, req,
1364 "Already past deadline (%+llds), not sending early reply. Consider increasing at_early_margin (%d)?",
1365 (s64)olddl, at_early_margin);
1367 /* Return an error so we're not re-added to the timed list. */
1371 if ((lustre_msghdr_get_flags(req->rq_reqmsg) &
1372 MSGHDR_AT_SUPPORT) == 0) {
1373 DEBUG_REQ(D_INFO, req,
1374 "Wanted to ask client for more time, but no AT support");
1378 if (req->rq_export &&
1379 lustre_msg_get_flags(req->rq_reqmsg) &
1380 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1381 struct obd_device *obd_exp = req->rq_export->exp_obd;
1384 * During recovery, we don't want to send too many early
1385 * replies, but on the other hand we want to make sure the
1386 * client has enough time to resend if the rpc is lost. So
1387 * during the recovery period send at least 4 early replies,
1388 * spacing them every at_extra if we can. at_estimate should
1389 * always equal this fixed value during recovery.
1393 * Don't account request processing time into AT history
1394 * during recovery, it is not service time we need but
1395 * includes also waiting time for recovering clients
1397 newdl = min_t(time64_t, at_extra,
1398 obd_exp->obd_recovery_timeout / 4) +
1399 ktime_get_real_seconds();
1402 * We want to extend the request deadline by at_extra seconds,
1403 * so we set our service estimate to reflect how much time has
1404 * passed since this request arrived plus an additional
1405 * at_extra seconds. The client will calculate the new deadline
1406 * based on this service estimate (plus some additional time to
1407 * account for network latency). See ptlrpc_at_recv_early_reply
1409 at_measured(&svcpt->scp_at_estimate, at_extra +
1410 ktime_get_real_seconds() -
1411 req->rq_arrival_time.tv_sec);
1412 newdl = req->rq_arrival_time.tv_sec +
1413 at_get(&svcpt->scp_at_estimate);
1417 * Check to see if we've actually increased the deadline -
1418 * we may be past adaptive_max
1420 if (req->rq_deadline >= newdl) {
1421 DEBUG_REQ(D_WARNING, req,
1422 "Could not add any time (%lld/%lld), not sending early reply",
1423 (s64)olddl, (s64)(newdl - ktime_get_real_seconds()));
1427 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1428 if (reqcopy == NULL)
1430 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1432 GOTO(out_free, rc = -ENOMEM);
1435 reqcopy->rq_reply_state = NULL;
1436 reqcopy->rq_rep_swab_mask = 0;
1437 reqcopy->rq_pack_bulk = 0;
1438 reqcopy->rq_pack_udesc = 0;
1439 reqcopy->rq_packed_final = 0;
1440 sptlrpc_svc_ctx_addref(reqcopy);
1441 /* We only need the reqmsg for the magic */
1442 reqcopy->rq_reqmsg = reqmsg;
1443 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1446 * tgt_brw_read() and tgt_brw_write() may have decided not to reply.
1447 * Without this check, we would fail the rq_no_reply assertion in
1448 * ptlrpc_send_reply().
1450 if (reqcopy->rq_no_reply)
1451 GOTO(out, rc = -ETIMEDOUT);
1453 LASSERT(atomic_read(&req->rq_refcount));
1454 /* if it is last refcount then early reply isn't needed */
1455 if (atomic_read(&req->rq_refcount) == 1) {
1456 DEBUG_REQ(D_ADAPTTO, reqcopy,
1457 "Normal reply already sent, abort early reply");
1458 GOTO(out, rc = -EINVAL);
1461 /* Connection ref */
1462 reqcopy->rq_export = class_conn2export(
1463 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1464 if (reqcopy->rq_export == NULL)
1465 GOTO(out, rc = -ENODEV);
1468 class_export_rpc_inc(reqcopy->rq_export);
1469 if (reqcopy->rq_export->exp_obd &&
1470 reqcopy->rq_export->exp_obd->obd_fail)
1471 GOTO(out_put, rc = -ENODEV);
1473 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1477 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1480 /* Adjust our own deadline to what we told the client */
1481 req->rq_deadline = newdl;
1482 req->rq_early_count++; /* number sent, server side */
1484 DEBUG_REQ(D_ERROR, req, "Early reply send failed: rc = %d", rc);
1488 * Free the (early) reply state from lustre_pack_reply.
1489 * (ptlrpc_send_reply takes it's own rs ref, so this is safe here)
1491 ptlrpc_req_drop_rs(reqcopy);
1494 class_export_rpc_dec(reqcopy->rq_export);
1495 class_export_put(reqcopy->rq_export);
1497 sptlrpc_svc_ctx_decref(reqcopy);
1498 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1500 ptlrpc_request_cache_free(reqcopy);
1505 * Send early replies to everybody expiring within at_early_margin
1506 * asking for at_extra time
1508 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1510 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1511 struct ptlrpc_request *rq, *n;
1512 struct list_head work_list;
1515 time64_t now = ktime_get_real_seconds();
1517 int first, counter = 0;
1520 spin_lock(&svcpt->scp_at_lock);
1521 if (svcpt->scp_at_check == 0) {
1522 spin_unlock(&svcpt->scp_at_lock);
1525 delay = ktime_ms_delta(ktime_get(), svcpt->scp_at_checktime);
1526 svcpt->scp_at_check = 0;
1528 if (array->paa_count == 0) {
1529 spin_unlock(&svcpt->scp_at_lock);
1533 /* The timer went off, but maybe the nearest rpc already completed. */
1534 first = array->paa_deadline - now;
1535 if (first > at_early_margin) {
1536 /* We've still got plenty of time. Reset the timer. */
1537 ptlrpc_at_set_timer(svcpt);
1538 spin_unlock(&svcpt->scp_at_lock);
1543 * We're close to a timeout, and we don't know how much longer the
1544 * server will take. Send early replies to everyone expiring soon.
1546 INIT_LIST_HEAD(&work_list);
1548 div_u64_rem(array->paa_deadline, array->paa_size, &index);
1549 count = array->paa_count;
1551 count -= array->paa_reqs_count[index];
1552 list_for_each_entry_safe(rq, n,
1553 &array->paa_reqs_array[index],
1555 if (rq->rq_deadline > now + at_early_margin) {
1556 /* update the earliest deadline */
1557 if (deadline == -1 ||
1558 rq->rq_deadline < deadline)
1559 deadline = rq->rq_deadline;
1564 * ptlrpc_server_drop_request() may drop
1565 * refcount to 0 already. Let's check this and
1566 * don't add entry to work_list
1568 if (likely(atomic_inc_not_zero(&rq->rq_refcount))) {
1569 ptlrpc_at_remove_timed(rq);
1570 list_add(&rq->rq_timed_list, &work_list);
1572 ptlrpc_at_remove_timed(rq);
1578 if (++index >= array->paa_size)
1581 array->paa_deadline = deadline;
1582 /* we have a new earliest deadline, restart the timer */
1583 ptlrpc_at_set_timer(svcpt);
1585 spin_unlock(&svcpt->scp_at_lock);
1588 "timeout in %+ds, asking for %d secs on %d early replies\n",
1589 first, at_extra, counter);
1592 * We're already past request deadlines before we even get a
1593 * chance to send early replies
1595 LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
1596 svcpt->scp_service->srv_name);
1597 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%lld\n",
1598 counter, svcpt->scp_nreqs_incoming,
1599 svcpt->scp_nreqs_active,
1600 at_get(&svcpt->scp_at_estimate), delay);
1604 * we took additional refcount so entries can't be deleted from list, no
1607 while (!list_empty(&work_list)) {
1608 rq = list_entry(work_list.next, struct ptlrpc_request,
1610 list_del_init(&rq->rq_timed_list);
1612 if (ptlrpc_at_send_early_reply(rq) == 0)
1613 ptlrpc_at_add_timed(rq);
1615 ptlrpc_server_drop_request(rq);
1618 RETURN(1); /* return "did_something" for liblustre */
1622 * Check if we are already handling earlier incarnation of this request.
1623 * Called under &req->rq_export->exp_rpc_lock locked
1625 static struct ptlrpc_request*
1626 ptlrpc_server_check_resend_in_progress(struct ptlrpc_request *req)
1628 struct ptlrpc_request *tmp = NULL;
1630 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ||
1631 (atomic_read(&req->rq_export->exp_rpc_count) == 0))
1635 * bulk request are aborted upon reconnect, don't try to
1638 if (req->rq_bulk_write || req->rq_bulk_read)
1642 * This list should not be longer than max_requests in
1643 * flights on the client, so it is not all that long.
1644 * Also we only hit this codepath in case of a resent
1645 * request which makes it even more rarely hit
1647 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs,
1649 /* Found duplicate one */
1650 if (tmp->rq_xid == req->rq_xid)
1653 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs,
1655 /* Found duplicate one */
1656 if (tmp->rq_xid == req->rq_xid)
1662 DEBUG_REQ(D_HA, req, "Found duplicate req in processing");
1663 DEBUG_REQ(D_HA, tmp, "Request being processed");
1668 * Check if a request should be assigned with a high priority.
1670 * \retval < 0: error occurred
1671 * 0: normal RPC request
1672 * +1: high priority request
1674 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1675 struct ptlrpc_request *req)
1680 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL) {
1681 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1688 if (req->rq_export != NULL && req->rq_ops != NULL) {
1690 * Perform request specific check. We should do this
1691 * check before the request is added into exp_hp_rpcs
1692 * list otherwise it may hit swab race at LU-1044.
1694 if (req->rq_ops->hpreq_check != NULL) {
1695 rc = req->rq_ops->hpreq_check(req);
1696 if (rc == -ESTALE) {
1697 req->rq_status = rc;
1701 * can only return error,
1702 * 0 for normal request,
1703 * or 1 for high priority request
1712 /** Remove the request from the export list. */
1713 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1716 if (req->rq_export) {
1718 * refresh lock timeout again so that client has more
1719 * room to send lock cancel RPC.
1721 if (req->rq_ops && req->rq_ops->hpreq_fini)
1722 req->rq_ops->hpreq_fini(req);
1724 spin_lock(&req->rq_export->exp_rpc_lock);
1725 list_del_init(&req->rq_exp_list);
1726 spin_unlock(&req->rq_export->exp_rpc_lock);
1731 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1736 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1737 .hpreq_check = ptlrpc_hpreq_check,
1740 /* Hi-Priority RPC check by RPC operation code. */
1741 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1743 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1746 * Check for export to let only reconnects for not yet evicted
1747 * export to become a HP rpc.
1749 if ((req->rq_export != NULL) &&
1750 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1751 req->rq_ops = &ptlrpc_hpreq_common;
1755 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1757 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1758 struct ptlrpc_request *req)
1762 struct ptlrpc_request *orig;
1766 rc = ptlrpc_server_hpreq_init(svcpt, req);
1771 ptlrpc_nrs_req_initialize(svcpt, req, hp);
1773 if (req->rq_export != NULL) {
1774 struct obd_export *exp = req->rq_export;
1777 * do search for duplicated xid and the adding to the list
1780 spin_lock_bh(&exp->exp_rpc_lock);
1781 orig = ptlrpc_server_check_resend_in_progress(req);
1782 if (orig && likely(atomic_inc_not_zero(&orig->rq_refcount))) {
1785 spin_unlock_bh(&exp->exp_rpc_lock);
1788 * When the client resend request and the server has
1789 * the previous copy of it, we need to update deadlines,
1790 * to be sure that the client and the server have equal
1791 * request deadlines.
1794 spin_lock(&orig->rq_rqbd->rqbd_svcpt->scp_at_lock);
1795 linked = orig->rq_at_linked;
1797 ptlrpc_at_remove_timed(orig);
1798 spin_unlock(&orig->rq_rqbd->rqbd_svcpt->scp_at_lock);
1799 orig->rq_deadline = req->rq_deadline;
1801 ptlrpc_at_add_timed(orig);
1802 ptlrpc_server_drop_request(orig);
1803 ptlrpc_nrs_req_finalize(req);
1807 if (hp || req->rq_ops != NULL)
1808 list_add(&req->rq_exp_list, &exp->exp_hp_rpcs);
1810 list_add(&req->rq_exp_list, &exp->exp_reg_rpcs);
1811 spin_unlock_bh(&exp->exp_rpc_lock);
1815 * the current thread is not the processing thread for this request
1816 * since that, but request is in exp_hp_list and can be find there.
1817 * Remove all relations between request and old thread.
1819 req->rq_svc_thread->t_env->le_ses = NULL;
1820 req->rq_svc_thread = NULL;
1821 req->rq_session.lc_thread = NULL;
1823 ptlrpc_nrs_req_add(svcpt, req, hp);
1829 * Allow to handle high priority request
1830 * User can call it w/o any lock but need to hold
1831 * ptlrpc_service_part::scp_req_lock to get reliable result
1833 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1836 int running = svcpt->scp_nthrs_running;
1838 if (!nrs_svcpt_has_hp(svcpt))
1844 if (ptlrpc_nrs_req_throttling_nolock(svcpt, true))
1847 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1848 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1849 /* leave just 1 thread for normal RPCs */
1850 running = PTLRPC_NTHRS_INIT;
1851 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1855 if (svcpt->scp_nreqs_active >= running - 1)
1858 if (svcpt->scp_nhreqs_active == 0)
1861 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1862 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1865 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1868 return ptlrpc_server_allow_high(svcpt, force) &&
1869 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1873 * Only allow normal priority requests on a service that has a high-priority
1874 * queue if forced (i.e. cleanup), if there are other high priority requests
1875 * already being processed (i.e. those threads can service more high-priority
1876 * requests), or if there are enough idle threads that a later thread can do
1877 * a high priority request.
1878 * User can call it w/o any lock but need to hold
1879 * ptlrpc_service_part::scp_req_lock to get reliable result
1881 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1884 int running = svcpt->scp_nthrs_running;
1886 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1887 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1888 /* leave just 1 thread for normal RPCs */
1889 running = PTLRPC_NTHRS_INIT;
1890 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1897 if (ptlrpc_nrs_req_throttling_nolock(svcpt, false))
1900 if (svcpt->scp_nreqs_active < running - 2)
1903 if (svcpt->scp_nreqs_active >= running - 1)
1906 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1909 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1912 return ptlrpc_server_allow_normal(svcpt, force) &&
1913 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1917 * Returns true if there are requests available in incoming
1918 * request queue for processing and it is allowed to fetch them.
1919 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1920 * to get reliable result
1921 * \see ptlrpc_server_allow_normal
1922 * \see ptlrpc_server_allow high
1925 bool ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt,
1928 return ptlrpc_server_high_pending(svcpt, force) ||
1929 ptlrpc_server_normal_pending(svcpt, force);
1933 * Fetch a request for processing from queue of unprocessed requests.
1934 * Favors high-priority requests.
1935 * Returns a pointer to fetched request.
1937 static struct ptlrpc_request *
1938 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1940 struct ptlrpc_request *req = NULL;
1944 spin_lock(&svcpt->scp_req_lock);
1946 if (ptlrpc_server_high_pending(svcpt, force)) {
1947 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1949 svcpt->scp_hreq_count++;
1954 if (ptlrpc_server_normal_pending(svcpt, force)) {
1955 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1957 svcpt->scp_hreq_count = 0;
1962 spin_unlock(&svcpt->scp_req_lock);
1966 svcpt->scp_nreqs_active++;
1968 svcpt->scp_nhreqs_active++;
1970 spin_unlock(&svcpt->scp_req_lock);
1972 if (likely(req->rq_export))
1973 class_export_rpc_inc(req->rq_export);
1979 * Handle freshly incoming reqs, add to timed early reply list,
1980 * pass on to regular request queue.
1981 * All incoming requests pass through here before getting into
1982 * ptlrpc_server_handle_req later on.
1984 static int ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1985 struct ptlrpc_thread *thread)
1987 struct ptlrpc_service *svc = svcpt->scp_service;
1988 struct ptlrpc_request *req;
1994 spin_lock(&svcpt->scp_lock);
1995 if (list_empty(&svcpt->scp_req_incoming)) {
1996 spin_unlock(&svcpt->scp_lock);
2000 req = list_entry(svcpt->scp_req_incoming.next,
2001 struct ptlrpc_request, rq_list);
2002 list_del_init(&req->rq_list);
2003 svcpt->scp_nreqs_incoming--;
2005 * Consider this still a "queued" request as far as stats are
2008 spin_unlock(&svcpt->scp_lock);
2010 /* go through security check/transform */
2011 rc = sptlrpc_svc_unwrap_request(req);
2015 case SECSVC_COMPLETE:
2016 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
2025 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
2026 * redo it wouldn't be harmful.
2028 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
2029 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
2031 CERROR("error unpacking request: ptl %d from %s x%llu\n",
2032 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
2038 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
2040 CERROR("error unpacking ptlrpc body: ptl %d from %s x %llu\n",
2041 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
2046 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
2047 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
2048 CERROR("drop incoming rpc opc %u, x%llu\n",
2049 cfs_fail_val, req->rq_xid);
2054 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
2055 CERROR("wrong packet type received (type=%u) from %s\n",
2056 lustre_msg_get_type(req->rq_reqmsg),
2057 libcfs_id2str(req->rq_peer));
2061 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
2065 req->rq_bulk_write = 1;
2069 case MGS_CONFIG_READ:
2070 req->rq_bulk_read = 1;
2074 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
2076 req->rq_export = class_conn2export(
2077 lustre_msg_get_handle(req->rq_reqmsg));
2078 if (req->rq_export) {
2079 rc = ptlrpc_check_req(req);
2081 rc = sptlrpc_target_export_check(req->rq_export, req);
2083 DEBUG_REQ(D_ERROR, req,
2084 "DROPPING req with illegal security flavor");
2089 ptlrpc_update_export_timer(req->rq_export, 0);
2092 /* req_in handling should/must be fast */
2093 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
2094 DEBUG_REQ(D_WARNING, req, "Slow req_in handling %llds",
2095 (s64)(ktime_get_real_seconds() -
2096 req->rq_arrival_time.tv_sec));
2098 /* Set rpc server deadline and add it to the timed list */
2099 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
2100 MSGHDR_AT_SUPPORT) ?
2101 /* The max time the client expects us to take */
2102 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
2104 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
2105 if (unlikely(deadline == 0)) {
2106 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
2110 /* Skip early reply */
2111 if (OBD_FAIL_PRECHECK(OBD_FAIL_MDS_RESEND))
2112 req->rq_deadline += obd_timeout;
2114 req->rq_svc_thread = thread;
2115 if (thread != NULL) {
2117 * initialize request session, it is needed for request
2118 * processing by target
2120 rc = lu_context_init(&req->rq_session, LCT_SERVER_SESSION |
2123 CERROR("%s: failure to initialize session: rc = %d\n",
2124 thread->t_name, rc);
2127 req->rq_session.lc_thread = thread;
2128 lu_context_enter(&req->rq_session);
2129 thread->t_env->le_ses = &req->rq_session;
2132 ptlrpc_at_add_timed(req);
2134 /* Move it over to the request processing queue */
2135 rc = ptlrpc_server_request_add(svcpt, req);
2139 wake_up(&svcpt->scp_waitq);
2143 ptlrpc_server_finish_request(svcpt, req);
2149 * Main incoming request handling logic.
2150 * Calls handler function from service to do actual processing.
2152 static int ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
2153 struct ptlrpc_thread *thread)
2155 struct ptlrpc_service *svc = svcpt->scp_service;
2156 struct ptlrpc_request *request;
2166 request = ptlrpc_server_request_get(svcpt, false);
2167 if (request == NULL)
2170 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
2171 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
2172 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
2173 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
2175 if (unlikely(fail_opc)) {
2176 if (request->rq_export && request->rq_ops)
2177 OBD_FAIL_TIMEOUT(fail_opc, 4);
2180 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
2182 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
2183 libcfs_debug_dumplog();
2185 work_start = ktime_get_real();
2186 arrived = timespec64_to_ktime(request->rq_arrival_time);
2187 timediff_usecs = ktime_us_delta(work_start, arrived);
2188 if (likely(svc->srv_stats != NULL)) {
2189 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
2191 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
2192 svcpt->scp_nreqs_incoming);
2193 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
2194 svcpt->scp_nreqs_active);
2195 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
2196 at_get(&svcpt->scp_at_estimate));
2199 if (likely(request->rq_export)) {
2200 if (unlikely(ptlrpc_check_req(request)))
2202 ptlrpc_update_export_timer(request->rq_export,
2203 div_u64(timediff_usecs,
2208 * Discard requests queued for longer than the deadline.
2209 * The deadline is increased if we send an early reply.
2211 if (ktime_get_real_seconds() > request->rq_deadline) {
2212 DEBUG_REQ(D_ERROR, request,
2213 "Dropping timed-out request from %s: deadline %lld/%llds ago",
2214 libcfs_id2str(request->rq_peer),
2215 request->rq_deadline -
2216 request->rq_arrival_time.tv_sec,
2217 ktime_get_real_seconds() - request->rq_deadline);
2222 "Handling RPC req@%p pname:cluuid+ref:pid:xid:nid:opc:job %s:%s+%d:%d:x%llu:%s:%d:%s\n",
2223 request, current_comm(),
2224 (request->rq_export ?
2225 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2226 (request->rq_export ?
2227 atomic_read(&request->rq_export->exp_refcount) : -99),
2228 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
2229 libcfs_id2str(request->rq_peer),
2230 lustre_msg_get_opc(request->rq_reqmsg),
2231 lustre_msg_get_jobid(request->rq_reqmsg) ?: "");
2233 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
2234 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
2236 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
2238 /* re-assign request and sesson thread to the current one */
2239 request->rq_svc_thread = thread;
2240 if (thread != NULL) {
2241 LASSERT(request->rq_session.lc_thread == NULL);
2242 request->rq_session.lc_thread = thread;
2243 thread->t_env->le_ses = &request->rq_session;
2245 svc->srv_ops.so_req_handler(request);
2247 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
2250 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
2251 DEBUG_REQ(D_WARNING, request,
2252 "Request took longer than estimated (%lld/%llds); client may timeout",
2253 request->rq_deadline -
2254 request->rq_arrival_time.tv_sec,
2255 ktime_get_real_seconds() - request->rq_deadline);
2258 work_end = ktime_get_real();
2259 timediff_usecs = ktime_us_delta(work_end, work_start);
2260 arrived_usecs = ktime_us_delta(work_end, arrived);
2262 "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",
2263 request, current_comm(),
2264 (request->rq_export ?
2265 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2266 (request->rq_export ?
2267 atomic_read(&request->rq_export->exp_refcount) : -99),
2268 lustre_msg_get_status(request->rq_reqmsg),
2270 libcfs_id2str(request->rq_peer),
2271 lustre_msg_get_opc(request->rq_reqmsg),
2272 lustre_msg_get_jobid(request->rq_reqmsg) ?: "",
2275 (request->rq_repmsg ?
2276 lustre_msg_get_transno(request->rq_repmsg) :
2277 request->rq_transno),
2279 (request->rq_repmsg ?
2280 lustre_msg_get_status(request->rq_repmsg) : -999));
2281 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2282 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2283 int opc = opcode_offset(op);
2285 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2286 LASSERT(opc < LUSTRE_MAX_OPCODES);
2287 lprocfs_counter_add(svc->srv_stats,
2288 opc + EXTRA_MAX_OPCODES,
2292 if (unlikely(request->rq_early_count)) {
2293 DEBUG_REQ(D_ADAPTTO, request,
2294 "sent %d early replies before finishing in %llds",
2295 request->rq_early_count,
2296 div_u64(arrived_usecs, USEC_PER_SEC));
2299 ptlrpc_server_finish_active_request(svcpt, request);
2305 * An internal function to process a single reply state object.
2307 static int ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2309 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2310 struct ptlrpc_service *svc = svcpt->scp_service;
2311 struct obd_export *exp;
2317 exp = rs->rs_export;
2319 LASSERT(rs->rs_difficult);
2320 LASSERT(rs->rs_scheduled);
2321 LASSERT(list_empty(&rs->rs_list));
2324 * The disk commit callback holds exp_uncommitted_replies_lock while it
2325 * iterates over newly committed replies, removing them from
2326 * exp_uncommitted_replies. It then drops this lock and schedules the
2327 * replies it found for handling here.
2329 * We can avoid contention for exp_uncommitted_replies_lock between the
2330 * HRT threads and further commit callbacks by checking rs_committed
2331 * which is set in the commit callback while it holds both
2332 * rs_lock and exp_uncommitted_reples.
2334 * If we see rs_committed clear, the commit callback _may_ not have
2335 * handled this reply yet and we race with it to grab
2336 * exp_uncommitted_replies_lock before removing the reply from
2337 * exp_uncommitted_replies. Note that if we lose the race and the
2338 * reply has already been removed, list_del_init() is a noop.
2340 * If we see rs_committed set, we know the commit callback is handling,
2341 * or has handled this reply since store reordering might allow us to
2342 * see rs_committed set out of sequence. But since this is done
2343 * holding rs_lock, we can be sure it has all completed once we hold
2344 * rs_lock, which we do right next.
2346 if (!rs->rs_committed) {
2348 * if rs was commited, no need to convert locks, don't check
2349 * rs_committed here because rs may never be added into
2350 * exp_uncommitted_replies and this flag never be set, see
2351 * target_send_reply()
2353 if (rs->rs_convert_lock &&
2354 rs->rs_transno > exp->exp_last_committed) {
2355 struct ldlm_lock *lock;
2356 struct ldlm_lock *ack_locks[RS_MAX_LOCKS] = { NULL };
2358 spin_lock(&rs->rs_lock);
2359 if (rs->rs_convert_lock &&
2360 rs->rs_transno > exp->exp_last_committed) {
2361 nlocks = rs->rs_nlocks;
2362 while (nlocks-- > 0) {
2364 * NB don't assume rs is always handled
2365 * by the same service thread (see
2366 * ptlrpc_hr_select, so REP-ACK hr may
2367 * race with trans commit, while the
2368 * latter will release locks, get locks
2369 * here early to convert to COS mode
2372 lock = ldlm_handle2lock(
2373 &rs->rs_locks[nlocks]);
2375 ack_locks[nlocks] = lock;
2376 rs->rs_modes[nlocks] = LCK_COS;
2378 nlocks = rs->rs_nlocks;
2379 rs->rs_convert_lock = 0;
2381 * clear rs_scheduled so that commit callback
2382 * can schedule again
2384 rs->rs_scheduled = 0;
2385 spin_unlock(&rs->rs_lock);
2387 while (nlocks-- > 0) {
2388 lock = ack_locks[nlocks];
2389 ldlm_lock_mode_downgrade(lock, LCK_COS);
2390 LDLM_LOCK_PUT(lock);
2394 spin_unlock(&rs->rs_lock);
2397 spin_lock(&exp->exp_uncommitted_replies_lock);
2398 list_del_init(&rs->rs_obd_list);
2399 spin_unlock(&exp->exp_uncommitted_replies_lock);
2402 spin_lock(&exp->exp_lock);
2403 /* Noop if removed already */
2404 list_del_init(&rs->rs_exp_list);
2405 spin_unlock(&exp->exp_lock);
2407 spin_lock(&rs->rs_lock);
2409 been_handled = rs->rs_handled;
2412 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2413 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2415 if (nlocks == 0 && !been_handled) {
2417 * If we see this, we should already have seen the warning
2418 * in mds_steal_ack_locks()
2421 "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
2422 rs, rs->rs_xid, rs->rs_transno, rs->rs_opc,
2423 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2426 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2427 spin_unlock(&rs->rs_lock);
2429 if (!been_handled && rs->rs_on_net) {
2430 LNetMDUnlink(rs->rs_md_h);
2431 /* Ignore return code; we're racing with completion */
2434 while (nlocks-- > 0)
2435 ldlm_lock_decref(&rs->rs_locks[nlocks],
2436 rs->rs_modes[nlocks]);
2438 spin_lock(&rs->rs_lock);
2441 rs->rs_scheduled = 0;
2442 rs->rs_convert_lock = 0;
2444 if (!rs->rs_on_net) {
2446 spin_unlock(&rs->rs_lock);
2448 class_export_put(exp);
2449 rs->rs_export = NULL;
2450 ptlrpc_rs_decref(rs);
2451 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2452 svc->srv_is_stopping)
2453 wake_up_all(&svcpt->scp_waitq);
2457 /* still on the net; callback will schedule */
2458 spin_unlock(&rs->rs_lock);
2463 static void ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2465 int avail = svcpt->scp_nrqbds_posted;
2466 int low_water = test_req_buffer_pressure ? 0 :
2467 svcpt->scp_service->srv_nbuf_per_group / 2;
2469 /* NB I'm not locking; just looking. */
2472 * CAVEAT EMPTOR: We might be allocating buffers here because we've
2473 * allowed the request history to grow out of control. We could put a
2474 * sanity check on that here and cull some history if we need the
2478 if (avail <= low_water)
2479 ptlrpc_grow_req_bufs(svcpt, 1);
2481 if (svcpt->scp_service->srv_stats) {
2482 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2483 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2487 static int ptlrpc_retry_rqbds(void *arg)
2489 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2491 svcpt->scp_rqbd_timeout = 0;
2495 static inline int ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2497 return svcpt->scp_nreqs_active <
2498 svcpt->scp_nthrs_running - 1 -
2499 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2503 * allowed to create more threads
2504 * user can call it w/o any lock but need to hold
2505 * ptlrpc_service_part::scp_lock to get reliable result
2507 static inline int ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2509 return svcpt->scp_nthrs_running +
2510 svcpt->scp_nthrs_starting <
2511 svcpt->scp_service->srv_nthrs_cpt_limit;
2515 * too many requests and allowed to create more threads
2517 static inline int ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2519 return !ptlrpc_threads_enough(svcpt) &&
2520 ptlrpc_threads_increasable(svcpt);
2523 static inline int ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2525 return thread_is_stopping(thread) ||
2526 thread->t_svcpt->scp_service->srv_is_stopping;
2529 /* stop the highest numbered thread if there are too many threads running */
2530 static inline bool ptlrpc_thread_should_stop(struct ptlrpc_thread *thread)
2532 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2534 return thread->t_id >= svcpt->scp_service->srv_nthrs_cpt_limit &&
2535 thread->t_id == svcpt->scp_thr_nextid - 1;
2538 static void ptlrpc_stop_thread(struct ptlrpc_thread *thread)
2540 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2541 thread->t_svcpt->scp_service->srv_thread_name, thread->t_id);
2542 thread_add_flags(thread, SVC_STOPPING);
2545 static inline void ptlrpc_thread_stop(struct ptlrpc_thread *thread)
2547 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2549 spin_lock(&svcpt->scp_lock);
2550 if (ptlrpc_thread_should_stop(thread)) {
2551 ptlrpc_stop_thread(thread);
2552 svcpt->scp_thr_nextid--;
2554 spin_unlock(&svcpt->scp_lock);
2557 static inline int ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2559 return !list_empty(&svcpt->scp_rqbd_idle) &&
2560 svcpt->scp_rqbd_timeout == 0;
2564 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2566 return svcpt->scp_at_check;
2570 * If a thread runs too long or spends to much time on a single request,
2571 * we want to know about it, so we set up a delayed work item as a watchdog.
2572 * If it fires, we display a stack trace of the delayed thread,
2573 * providing we aren't rate-limited
2575 * Watchdog stack traces are limited to 3 per 'libcfs_watchdog_ratelimit'
2578 static struct ratelimit_state watchdog_limit;
2580 static void ptlrpc_watchdog_fire(struct work_struct *w)
2582 struct ptlrpc_thread *thread = container_of(w, struct ptlrpc_thread,
2584 u64 ms_lapse = ktime_ms_delta(ktime_get(), thread->t_touched);
2585 u32 ms_frac = do_div(ms_lapse, MSEC_PER_SEC);
2587 if (!__ratelimit(&watchdog_limit)) {
2588 /* below message is checked in sanity-quota.sh test_6,18 */
2589 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",
2590 thread->t_task->comm, thread->t_task->pid,
2593 libcfs_debug_dumpstack(thread->t_task);
2595 /* below message is checked in sanity-quota.sh test_6,18 */
2596 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",
2597 thread->t_task->comm, thread->t_task->pid,
2598 ms_lapse, ms_frac, libcfs_watchdog_ratelimit);
2602 static void ptlrpc_watchdog_init(struct delayed_work *work, time_t time)
2604 INIT_DELAYED_WORK(work, ptlrpc_watchdog_fire);
2605 schedule_delayed_work(work, cfs_time_seconds(time));
2608 static void ptlrpc_watchdog_disable(struct delayed_work *work)
2610 cancel_delayed_work_sync(work);
2613 static void ptlrpc_watchdog_touch(struct delayed_work *work, time_t time)
2615 struct ptlrpc_thread *thread = container_of(&work->work,
2616 struct ptlrpc_thread,
2618 thread->t_touched = ktime_get();
2619 mod_delayed_work(system_wq, work, cfs_time_seconds(time));
2623 * requests wait on preprocessing
2624 * user can call it w/o any lock but need to hold
2625 * ptlrpc_service_part::scp_lock to get reliable result
2628 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2630 return !list_empty(&svcpt->scp_req_incoming);
2633 static __attribute__((__noinline__)) int
2634 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2635 struct ptlrpc_thread *thread)
2637 /* Don't exit while there are replies to be handled */
2638 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2639 ptlrpc_retry_rqbds, svcpt);
2641 ptlrpc_watchdog_disable(&thread->t_watchdog);
2645 l_wait_event_exclusive_head(svcpt->scp_waitq,
2646 ptlrpc_thread_stopping(thread) ||
2647 ptlrpc_server_request_incoming(svcpt) ||
2648 ptlrpc_server_request_pending(svcpt, false) ||
2649 ptlrpc_rqbd_pending(svcpt) ||
2650 ptlrpc_at_check(svcpt), &lwi);
2652 if (ptlrpc_thread_stopping(thread))
2655 ptlrpc_watchdog_touch(&thread->t_watchdog,
2656 ptlrpc_server_get_timeout(svcpt));
2661 * Main thread body for service threads.
2662 * Waits in a loop waiting for new requests to process to appear.
2663 * Every time an incoming requests is added to its queue, a waitq
2664 * is woken up and one of the threads will handle it.
2666 static int ptlrpc_main(void *arg)
2668 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2669 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2670 struct ptlrpc_service *svc = svcpt->scp_service;
2671 struct ptlrpc_reply_state *rs;
2672 struct group_info *ginfo = NULL;
2674 int counter = 0, rc = 0;
2678 thread->t_task = current;
2679 thread->t_pid = current_pid();
2680 unshare_fs_struct();
2682 if (svc->srv_cpt_bind) {
2683 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2685 CWARN("%s: failed to bind %s on CPT %d\n",
2686 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2690 ginfo = groups_alloc(0);
2692 GOTO(out, rc = -ENOMEM);
2694 set_current_groups(ginfo);
2695 put_group_info(ginfo);
2697 if (svc->srv_ops.so_thr_init != NULL) {
2698 rc = svc->srv_ops.so_thr_init(thread);
2705 GOTO(out_srv_fini, rc = -ENOMEM);
2706 rc = lu_env_add(env);
2710 rc = lu_context_init(&env->le_ctx,
2711 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2713 GOTO(out_env_remove, rc);
2715 thread->t_env = env;
2716 env->le_ctx.lc_thread = thread;
2717 env->le_ctx.lc_cookie = 0x6;
2719 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2720 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2724 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2725 svc->srv_name, svcpt->scp_cpt, rc);
2726 GOTO(out_ctx_fini, rc);
2729 /* Alloc reply state structure for this one */
2730 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2732 GOTO(out_ctx_fini, rc = -ENOMEM);
2734 spin_lock(&svcpt->scp_lock);
2736 LASSERT(thread_is_starting(thread));
2737 thread_clear_flags(thread, SVC_STARTING);
2739 LASSERT(svcpt->scp_nthrs_starting == 1);
2740 svcpt->scp_nthrs_starting--;
2743 * SVC_STOPPING may already be set here if someone else is trying
2744 * to stop the service while this new thread has been dynamically
2745 * forked. We still set SVC_RUNNING to let our creator know that
2746 * we are now running, however we will exit as soon as possible
2748 thread_add_flags(thread, SVC_RUNNING);
2749 svcpt->scp_nthrs_running++;
2750 spin_unlock(&svcpt->scp_lock);
2752 /* wake up our creator in case he's still waiting. */
2753 wake_up(&thread->t_ctl_waitq);
2755 thread->t_touched = ktime_get();
2756 ptlrpc_watchdog_init(&thread->t_watchdog,
2757 ptlrpc_server_get_timeout(svcpt));
2759 spin_lock(&svcpt->scp_rep_lock);
2760 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2761 wake_up(&svcpt->scp_rep_waitq);
2762 spin_unlock(&svcpt->scp_rep_lock);
2764 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2765 svcpt->scp_nthrs_running);
2767 /* XXX maintain a list of all managed devices: insert here */
2768 while (!ptlrpc_thread_stopping(thread)) {
2769 if (ptlrpc_wait_event(svcpt, thread))
2772 ptlrpc_check_rqbd_pool(svcpt);
2774 if (ptlrpc_threads_need_create(svcpt)) {
2775 /* Ignore return code - we tried... */
2776 ptlrpc_start_thread(svcpt, 0);
2779 /* reset le_ses to initial state */
2781 /* Process all incoming reqs before handling any */
2782 if (ptlrpc_server_request_incoming(svcpt)) {
2783 lu_context_enter(&env->le_ctx);
2784 ptlrpc_server_handle_req_in(svcpt, thread);
2785 lu_context_exit(&env->le_ctx);
2787 /* but limit ourselves in case of flood */
2788 if (counter++ < 100)
2793 if (ptlrpc_at_check(svcpt))
2794 ptlrpc_at_check_timed(svcpt);
2796 if (ptlrpc_server_request_pending(svcpt, false)) {
2797 lu_context_enter(&env->le_ctx);
2798 ptlrpc_server_handle_request(svcpt, thread);
2799 lu_context_exit(&env->le_ctx);
2802 if (ptlrpc_rqbd_pending(svcpt) &&
2803 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2805 * I just failed to repost request buffers.
2806 * Wait for a timeout (unless something else
2807 * happens) before I try again
2809 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2810 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2811 svcpt->scp_nrqbds_posted);
2814 * If the number of threads has been tuned downward and this
2815 * thread should be stopped, then stop in reverse order so the
2816 * the threads always have contiguous thread index values.
2818 if (unlikely(ptlrpc_thread_should_stop(thread)))
2819 ptlrpc_thread_stop(thread);
2822 ptlrpc_watchdog_disable(&thread->t_watchdog);
2825 lu_context_fini(&env->le_ctx);
2831 /* deconstruct service thread state created by ptlrpc_start_thread() */
2832 if (svc->srv_ops.so_thr_done != NULL)
2833 svc->srv_ops.so_thr_done(thread);
2835 CDEBUG(D_RPCTRACE, "%s: service thread [%p:%u] %d exiting: rc = %d\n",
2836 thread->t_name, thread, thread->t_pid, thread->t_id, rc);
2837 spin_lock(&svcpt->scp_lock);
2838 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2839 svcpt->scp_nthrs_starting--;
2841 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2842 /* must know immediately */
2843 svcpt->scp_nthrs_running--;
2847 thread_add_flags(thread, SVC_STOPPED);
2849 wake_up(&thread->t_ctl_waitq);
2850 spin_unlock(&svcpt->scp_lock);
2855 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2856 struct list_head *replies)
2860 spin_lock(&hrt->hrt_lock);
2862 list_splice_init(&hrt->hrt_queue, replies);
2863 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2865 spin_unlock(&hrt->hrt_lock);
2870 * Main body of "handle reply" function.
2871 * It processes acked reply states
2873 static int ptlrpc_hr_main(void *arg)
2875 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2876 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2877 struct list_head replies;
2885 INIT_LIST_HEAD(&replies);
2886 unshare_fs_struct();
2888 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2890 char threadname[20];
2892 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2893 hrp->hrp_cpt, hrt->hrt_id);
2894 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2895 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2898 rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD |
2899 LCT_REMEMBER | LCT_NOREF);
2903 rc = lu_env_add(env);
2905 GOTO(out_ctx_fini, rc);
2907 atomic_inc(&hrp->hrp_nstarted);
2908 wake_up(&ptlrpc_hr.hr_waitq);
2910 while (!ptlrpc_hr.hr_stopping) {
2911 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2913 while (!list_empty(&replies)) {
2914 struct ptlrpc_reply_state *rs;
2916 rs = list_entry(replies.prev,
2917 struct ptlrpc_reply_state,
2919 list_del_init(&rs->rs_list);
2920 /* refill keys if needed */
2922 lu_context_enter(&env->le_ctx);
2923 ptlrpc_handle_rs(rs);
2924 lu_context_exit(&env->le_ctx);
2928 atomic_inc(&hrp->hrp_nstopped);
2929 wake_up(&ptlrpc_hr.hr_waitq);
2933 lu_context_fini(&env->le_ctx);
2939 static void ptlrpc_stop_hr_threads(void)
2941 struct ptlrpc_hr_partition *hrp;
2945 ptlrpc_hr.hr_stopping = 1;
2947 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2948 if (hrp->hrp_thrs == NULL)
2949 continue; /* uninitialized */
2950 for (j = 0; j < hrp->hrp_nthrs; j++)
2951 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2954 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2955 if (hrp->hrp_thrs == NULL)
2956 continue; /* uninitialized */
2957 wait_event(ptlrpc_hr.hr_waitq,
2958 atomic_read(&hrp->hrp_nstopped) ==
2959 atomic_read(&hrp->hrp_nstarted));
2963 static int ptlrpc_start_hr_threads(void)
2965 struct ptlrpc_hr_partition *hrp;
2971 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2974 for (j = 0; j < hrp->hrp_nthrs; j++) {
2975 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2976 struct task_struct *task;
2978 task = kthread_run(ptlrpc_hr_main,
2980 "ptlrpc_hr%02d_%03d",
2989 wait_event(ptlrpc_hr.hr_waitq,
2990 atomic_read(&hrp->hrp_nstarted) == j);
2993 CERROR("cannot start reply handler thread %d:%d: rc = %d\n",
2995 ptlrpc_stop_hr_threads();
3003 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
3005 struct l_wait_info lwi = { 0 };
3006 struct ptlrpc_thread *thread;
3007 struct list_head zombie;
3011 CDEBUG(D_INFO, "Stopping threads for service %s\n",
3012 svcpt->scp_service->srv_name);
3014 INIT_LIST_HEAD(&zombie);
3015 spin_lock(&svcpt->scp_lock);
3016 /* let the thread know that we would like it to stop asap */
3017 list_for_each_entry(thread, &svcpt->scp_threads, t_link)
3018 ptlrpc_stop_thread(thread);
3020 wake_up_all(&svcpt->scp_waitq);
3022 while (!list_empty(&svcpt->scp_threads)) {
3023 thread = list_entry(svcpt->scp_threads.next,
3024 struct ptlrpc_thread, t_link);
3025 if (thread_is_stopped(thread)) {
3026 list_move(&thread->t_link, &zombie);
3029 spin_unlock(&svcpt->scp_lock);
3031 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
3032 svcpt->scp_service->srv_thread_name, thread->t_id);
3033 l_wait_event(thread->t_ctl_waitq,
3034 thread_is_stopped(thread), &lwi);
3036 spin_lock(&svcpt->scp_lock);
3039 spin_unlock(&svcpt->scp_lock);
3041 while (!list_empty(&zombie)) {
3042 thread = list_entry(zombie.next,
3043 struct ptlrpc_thread, t_link);
3044 list_del(&thread->t_link);
3045 OBD_FREE_PTR(thread);
3051 * Stops all threads of a particular service \a svc
3053 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
3055 struct ptlrpc_service_part *svcpt;
3060 ptlrpc_service_for_each_part(svcpt, i, svc) {
3061 if (svcpt->scp_service != NULL)
3062 ptlrpc_svcpt_stop_threads(svcpt);
3068 int ptlrpc_start_threads(struct ptlrpc_service *svc)
3076 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
3077 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
3079 for (i = 0; i < svc->srv_ncpts; i++) {
3080 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
3081 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
3087 /* We have enough threads, don't start more. b=15759 */
3094 CERROR("cannot start %s thread #%d_%d: rc %d\n",
3095 svc->srv_thread_name, i, j, rc);
3096 ptlrpc_stop_all_threads(svc);
3100 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
3102 struct l_wait_info lwi = { 0 };
3103 struct ptlrpc_thread *thread;
3104 struct ptlrpc_service *svc;
3105 struct task_struct *task;
3110 LASSERT(svcpt != NULL);
3112 svc = svcpt->scp_service;
3114 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
3115 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
3116 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
3119 if (unlikely(svc->srv_is_stopping))
3122 if (!ptlrpc_threads_increasable(svcpt) ||
3123 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
3124 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
3127 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
3130 init_waitqueue_head(&thread->t_ctl_waitq);
3132 spin_lock(&svcpt->scp_lock);
3133 if (!ptlrpc_threads_increasable(svcpt)) {
3134 spin_unlock(&svcpt->scp_lock);
3135 OBD_FREE_PTR(thread);
3139 if (svcpt->scp_nthrs_starting != 0) {
3141 * serialize starting because some modules (obdfilter)
3142 * might require unique and contiguous t_id
3144 LASSERT(svcpt->scp_nthrs_starting == 1);
3145 spin_unlock(&svcpt->scp_lock);
3146 OBD_FREE_PTR(thread);
3148 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
3149 svc->srv_thread_name, svcpt->scp_thr_nextid);
3154 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
3155 svc->srv_thread_name, svcpt->scp_thr_nextid);
3159 svcpt->scp_nthrs_starting++;
3160 thread->t_id = svcpt->scp_thr_nextid++;
3161 thread_add_flags(thread, SVC_STARTING);
3162 thread->t_svcpt = svcpt;
3164 list_add(&thread->t_link, &svcpt->scp_threads);
3165 spin_unlock(&svcpt->scp_lock);
3167 if (svcpt->scp_cpt >= 0) {
3168 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s%02d_%03d",
3169 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
3171 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s_%04d",
3172 svc->srv_thread_name, thread->t_id);
3175 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
3176 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
3179 CERROR("cannot start thread '%s': rc = %d\n",
3180 thread->t_name, rc);
3181 spin_lock(&svcpt->scp_lock);
3182 --svcpt->scp_nthrs_starting;
3183 if (thread_is_stopping(thread)) {
3185 * this ptlrpc_thread is being hanled
3186 * by ptlrpc_svcpt_stop_threads now
3188 thread_add_flags(thread, SVC_STOPPED);
3189 wake_up(&thread->t_ctl_waitq);
3190 spin_unlock(&svcpt->scp_lock);
3192 list_del(&thread->t_link);
3193 spin_unlock(&svcpt->scp_lock);
3194 OBD_FREE_PTR(thread);
3202 l_wait_event(thread->t_ctl_waitq,
3203 thread_is_running(thread) || thread_is_stopped(thread),
3206 rc = thread_is_stopped(thread) ? thread->t_id : 0;
3210 int ptlrpc_hr_init(void)
3212 struct ptlrpc_hr_partition *hrp;
3213 struct ptlrpc_hr_thread *hrt;
3221 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
3222 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
3224 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
3226 if (ptlrpc_hr.hr_partitions == NULL)
3229 ratelimit_state_init(&watchdog_limit,
3230 cfs_time_seconds(libcfs_watchdog_ratelimit), 3);
3232 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
3235 weight = cpumask_weight(topology_sibling_cpumask(smp_processor_id()));
3238 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3241 atomic_set(&hrp->hrp_nstarted, 0);
3242 atomic_set(&hrp->hrp_nstopped, 0);
3244 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, cpt);
3245 hrp->hrp_nthrs /= weight;
3246 if (hrp->hrp_nthrs == 0)
3249 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, cpt,
3250 hrp->hrp_nthrs * sizeof(*hrt));
3251 if (hrp->hrp_thrs == NULL)
3252 GOTO(out, rc = -ENOMEM);
3254 for (i = 0; i < hrp->hrp_nthrs; i++) {
3255 hrt = &hrp->hrp_thrs[i];
3258 hrt->hrt_partition = hrp;
3259 init_waitqueue_head(&hrt->hrt_waitq);
3260 spin_lock_init(&hrt->hrt_lock);
3261 INIT_LIST_HEAD(&hrt->hrt_queue);
3265 rc = ptlrpc_start_hr_threads();
3272 void ptlrpc_hr_fini(void)
3274 struct ptlrpc_hr_partition *hrp;
3277 if (ptlrpc_hr.hr_partitions == NULL)
3280 ptlrpc_stop_hr_threads();
3282 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3283 if (hrp->hrp_thrs != NULL) {
3284 OBD_FREE(hrp->hrp_thrs,
3285 hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
3289 cfs_percpt_free(ptlrpc_hr.hr_partitions);
3290 ptlrpc_hr.hr_partitions = NULL;
3295 * Wait until all already scheduled replies are processed.
3297 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
3301 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
3304 rc = l_wait_event(svcpt->scp_waitq,
3305 atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
3308 CWARN("Unexpectedly long timeout %s %p\n",
3309 svcpt->scp_service->srv_name, svcpt->scp_service);
3314 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
3316 struct ptlrpc_service_part *svcpt;
3319 /* early disarm AT timer... */
3320 ptlrpc_service_for_each_part(svcpt, i, svc) {
3321 if (svcpt->scp_service != NULL)
3322 del_timer(&svcpt->scp_at_timer);
3327 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
3329 struct ptlrpc_service_part *svcpt;
3330 struct ptlrpc_request_buffer_desc *rqbd;
3331 struct l_wait_info lwi;
3336 * All history will be culled when the next request buffer is
3337 * freed in ptlrpc_service_purge_all()
3339 svc->srv_hist_nrqbds_cpt_max = 0;
3341 rc = LNetClearLazyPortal(svc->srv_req_portal);
3344 ptlrpc_service_for_each_part(svcpt, i, svc) {
3345 if (svcpt->scp_service == NULL)
3349 * Unlink all the request buffers. This forces a 'final'
3350 * event with its 'unlink' flag set for each posted rqbd
3352 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
3354 rc = LNetMDUnlink(rqbd->rqbd_md_h);
3355 LASSERT(rc == 0 || rc == -ENOENT);
3359 ptlrpc_service_for_each_part(svcpt, i, svc) {
3360 if (svcpt->scp_service == NULL)
3364 * Wait for the network to release any buffers
3365 * it's currently filling
3367 spin_lock(&svcpt->scp_lock);
3368 while (svcpt->scp_nrqbds_posted != 0) {
3369 spin_unlock(&svcpt->scp_lock);
3371 * Network access will complete in finite time but
3372 * the HUGE timeout lets us CWARN for visibility
3375 lwi = LWI_TIMEOUT_INTERVAL(
3376 cfs_time_seconds(LONG_UNLINK),
3377 cfs_time_seconds(1), NULL, NULL);
3378 rc = l_wait_event(svcpt->scp_waitq,
3379 svcpt->scp_nrqbds_posted == 0, &lwi);
3380 if (rc == -ETIMEDOUT) {
3381 CWARN("Service %s waiting for request buffers\n",
3382 svcpt->scp_service->srv_name);
3384 spin_lock(&svcpt->scp_lock);
3386 spin_unlock(&svcpt->scp_lock);
3391 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
3393 struct ptlrpc_service_part *svcpt;
3394 struct ptlrpc_request_buffer_desc *rqbd;
3395 struct ptlrpc_request *req;
3396 struct ptlrpc_reply_state *rs;
3399 ptlrpc_service_for_each_part(svcpt, i, svc) {
3400 if (svcpt->scp_service == NULL)
3403 spin_lock(&svcpt->scp_rep_lock);
3404 while (!list_empty(&svcpt->scp_rep_active)) {
3405 rs = list_entry(svcpt->scp_rep_active.next,
3406 struct ptlrpc_reply_state, rs_list);
3407 spin_lock(&rs->rs_lock);
3408 ptlrpc_schedule_difficult_reply(rs);
3409 spin_unlock(&rs->rs_lock);
3411 spin_unlock(&svcpt->scp_rep_lock);
3414 * purge the request queue. NB No new replies (rqbds
3415 * all unlinked) and no service threads, so I'm the only
3416 * thread noodling the request queue now
3418 while (!list_empty(&svcpt->scp_req_incoming)) {
3419 req = list_entry(svcpt->scp_req_incoming.next,
3420 struct ptlrpc_request, rq_list);
3422 list_del(&req->rq_list);
3423 svcpt->scp_nreqs_incoming--;
3424 ptlrpc_server_finish_request(svcpt, req);
3427 while (ptlrpc_server_request_pending(svcpt, true)) {
3428 req = ptlrpc_server_request_get(svcpt, true);
3429 ptlrpc_server_finish_active_request(svcpt, req);
3432 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
3433 LASSERT(svcpt->scp_nreqs_incoming == 0);
3434 LASSERT(svcpt->scp_nreqs_active == 0);
3436 * history should have been culled by
3437 * ptlrpc_server_finish_request
3439 LASSERT(svcpt->scp_hist_nrqbds == 0);
3442 * Now free all the request buffers since nothing
3443 * references them any more...
3446 while (!list_empty(&svcpt->scp_rqbd_idle)) {
3447 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
3448 struct ptlrpc_request_buffer_desc,
3450 ptlrpc_free_rqbd(rqbd);
3452 ptlrpc_wait_replies(svcpt);
3454 while (!list_empty(&svcpt->scp_rep_idle)) {
3455 rs = list_entry(svcpt->scp_rep_idle.next,
3456 struct ptlrpc_reply_state,
3458 list_del(&rs->rs_list);
3459 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
3465 ptlrpc_service_free(struct ptlrpc_service *svc)
3467 struct ptlrpc_service_part *svcpt;
3468 struct ptlrpc_at_array *array;
3471 ptlrpc_service_for_each_part(svcpt, i, svc) {
3472 if (svcpt->scp_service == NULL)
3475 /* In case somebody rearmed this in the meantime */
3476 del_timer(&svcpt->scp_at_timer);
3477 array = &svcpt->scp_at_array;
3479 if (array->paa_reqs_array != NULL) {
3480 OBD_FREE(array->paa_reqs_array,
3481 sizeof(struct list_head) * array->paa_size);
3482 array->paa_reqs_array = NULL;
3485 if (array->paa_reqs_count != NULL) {
3486 OBD_FREE(array->paa_reqs_count,
3487 sizeof(__u32) * array->paa_size);
3488 array->paa_reqs_count = NULL;
3492 ptlrpc_service_for_each_part(svcpt, i, svc)
3493 OBD_FREE_PTR(svcpt);
3495 if (svc->srv_cpts != NULL)
3496 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3498 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3499 srv_parts[svc->srv_ncpts]));
3502 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3506 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3508 service->srv_is_stopping = 1;
3510 mutex_lock(&ptlrpc_all_services_mutex);
3511 list_del_init(&service->srv_list);
3512 mutex_unlock(&ptlrpc_all_services_mutex);
3514 ptlrpc_service_del_atimer(service);
3515 ptlrpc_stop_all_threads(service);
3517 ptlrpc_service_unlink_rqbd(service);
3518 ptlrpc_service_purge_all(service);
3519 ptlrpc_service_nrs_cleanup(service);
3521 ptlrpc_lprocfs_unregister_service(service);
3522 ptlrpc_sysfs_unregister_service(service);
3524 ptlrpc_service_free(service);
3528 EXPORT_SYMBOL(ptlrpc_unregister_service);
3531 * Returns 0 if the service is healthy.
3533 * Right now, it just checks to make sure that requests aren't languishing
3534 * in the queue. We'll use this health check to govern whether a node needs
3535 * to be shot, so it's intentionally non-aggressive.
3537 static int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3539 struct ptlrpc_request *request = NULL;
3540 struct timespec64 right_now;
3541 struct timespec64 timediff;
3543 ktime_get_real_ts64(&right_now);
3545 spin_lock(&svcpt->scp_req_lock);
3546 /* How long has the next entry been waiting? */
3547 if (ptlrpc_server_high_pending(svcpt, true))
3548 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3549 else if (ptlrpc_server_normal_pending(svcpt, true))
3550 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3552 if (request == NULL) {
3553 spin_unlock(&svcpt->scp_req_lock);
3557 timediff = timespec64_sub(right_now, request->rq_arrival_time);
3558 spin_unlock(&svcpt->scp_req_lock);
3560 if ((timediff.tv_sec) >
3561 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3562 CERROR("%s: unhealthy - request has been waiting %llds\n",
3563 svcpt->scp_service->srv_name, (s64)timediff.tv_sec);
3571 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3573 struct ptlrpc_service_part *svcpt;
3579 ptlrpc_service_for_each_part(svcpt, i, svc) {
3580 int rc = ptlrpc_svcpt_health_check(svcpt);
3587 EXPORT_SYMBOL(ptlrpc_service_health_check);