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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_RPC
38 #include <obd_support.h>
39 #include <obd_class.h>
40 #include <lustre_net.h>
41 #include <lu_object.h>
42 #include <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 CFS_MODULE_PARM(test_req_buffer_pressure, "i", int, 0444,
48 "set non-zero to put pressure on request buffer pools");
49 CFS_MODULE_PARM(at_min, "i", int, 0644,
50 "Adaptive timeout minimum (sec)");
51 CFS_MODULE_PARM(at_max, "i", int, 0644,
52 "Adaptive timeout maximum (sec)");
53 CFS_MODULE_PARM(at_history, "i", int, 0644,
54 "Adaptive timeouts remember the slowest event that took place "
55 "within this period (sec)");
56 CFS_MODULE_PARM(at_early_margin, "i", int, 0644,
57 "How soon before an RPC deadline to send an early reply");
58 CFS_MODULE_PARM(at_extra, "i", int, 0644,
59 "How much extra time to give with each early reply");
63 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt);
64 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req);
65 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req);
67 /** Holds a list of all PTLRPC services */
68 struct list_head ptlrpc_all_services;
69 /** Used to protect the \e ptlrpc_all_services list */
70 struct mutex ptlrpc_all_services_mutex;
72 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);
103 ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
105 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
107 LASSERT(rqbd->rqbd_refcount == 0);
108 LASSERT(list_empty(&rqbd->rqbd_reqs));
110 spin_lock(&svcpt->scp_lock);
111 list_del(&rqbd->rqbd_list);
112 svcpt->scp_nrqbds_total--;
113 spin_unlock(&svcpt->scp_lock);
115 OBD_FREE_LARGE(rqbd->rqbd_buffer, svcpt->scp_service->srv_buf_size);
120 ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
122 struct ptlrpc_service *svc = svcpt->scp_service;
123 struct ptlrpc_request_buffer_desc *rqbd;
127 if (svcpt->scp_rqbd_allocating)
130 spin_lock(&svcpt->scp_lock);
131 /* check again with lock */
132 if (svcpt->scp_rqbd_allocating) {
133 /* NB: we might allow more than one thread in the future */
134 LASSERT(svcpt->scp_rqbd_allocating == 1);
135 spin_unlock(&svcpt->scp_lock);
139 svcpt->scp_rqbd_allocating++;
140 spin_unlock(&svcpt->scp_lock);
143 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
144 /* NB: another thread might have recycled enough rqbds, we
145 * need to make sure it wouldn't over-allocate, see LU-1212. */
146 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group)
149 rqbd = ptlrpc_alloc_rqbd(svcpt);
152 CERROR("%s: Can't allocate request buffer\n",
159 spin_lock(&svcpt->scp_lock);
161 LASSERT(svcpt->scp_rqbd_allocating == 1);
162 svcpt->scp_rqbd_allocating--;
164 spin_unlock(&svcpt->scp_lock);
167 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
168 svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted,
169 svcpt->scp_nrqbds_total, rc);
173 rc = ptlrpc_server_post_idle_rqbds(svcpt);
179 * Part of Rep-Ack logic.
180 * Puts a lock and its mode into reply state assotiated to request reply.
183 ptlrpc_save_lock(struct ptlrpc_request *req,
184 struct lustre_handle *lock, int mode, int no_ack)
186 struct ptlrpc_reply_state *rs = req->rq_reply_state;
190 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
192 if (req->rq_export->exp_disconnected) {
193 ldlm_lock_decref(lock, mode);
195 idx = rs->rs_nlocks++;
196 rs->rs_locks[idx] = *lock;
197 rs->rs_modes[idx] = mode;
198 rs->rs_difficult = 1;
199 rs->rs_no_ack = !!no_ack;
202 EXPORT_SYMBOL(ptlrpc_save_lock);
205 struct ptlrpc_hr_partition;
207 struct ptlrpc_hr_thread {
208 int hrt_id; /* thread ID */
210 wait_queue_head_t hrt_waitq;
211 struct list_head hrt_queue; /* RS queue */
212 struct ptlrpc_hr_partition *hrt_partition;
215 struct ptlrpc_hr_partition {
216 /* # of started threads */
217 atomic_t hrp_nstarted;
218 /* # of stopped threads */
219 atomic_t hrp_nstopped;
220 /* cpu partition id */
222 /* round-robin rotor for choosing thread */
224 /* total number of threads on this partition */
227 struct ptlrpc_hr_thread *hrp_thrs;
230 #define HRT_RUNNING 0
231 #define HRT_STOPPING 1
233 struct ptlrpc_hr_service {
234 /* CPU partition table, it's just cfs_cpt_table for now */
235 struct cfs_cpt_table *hr_cpt_table;
236 /** controller sleep waitq */
237 wait_queue_head_t hr_waitq;
238 unsigned int hr_stopping;
239 /** roundrobin rotor for non-affinity service */
240 unsigned int hr_rotor;
242 struct ptlrpc_hr_partition **hr_partitions;
246 struct list_head rsb_replies;
247 unsigned int rsb_n_replies;
248 struct ptlrpc_service_part *rsb_svcpt;
251 /** reply handling service. */
252 static struct ptlrpc_hr_service ptlrpc_hr;
255 * maximum mumber of replies scheduled in one batch
257 #define MAX_SCHEDULED 256
260 * Initialize a reply batch.
264 static void rs_batch_init(struct rs_batch *b)
266 memset(b, 0, sizeof *b);
267 INIT_LIST_HEAD(&b->rsb_replies);
271 * Choose an hr thread to dispatch requests to.
273 static struct ptlrpc_hr_thread *
274 ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
276 struct ptlrpc_hr_partition *hrp;
279 if (svcpt->scp_cpt >= 0 &&
280 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
281 /* directly match partition */
282 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
285 rotor = ptlrpc_hr.hr_rotor++;
286 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
288 hrp = ptlrpc_hr.hr_partitions[rotor];
291 rotor = hrp->hrp_rotor++;
292 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
296 * Dispatch all replies accumulated in the batch to one from
297 * dedicated reply handling threads.
301 static void rs_batch_dispatch(struct rs_batch *b)
303 if (b->rsb_n_replies != 0) {
304 struct ptlrpc_hr_thread *hrt;
306 hrt = ptlrpc_hr_select(b->rsb_svcpt);
308 spin_lock(&hrt->hrt_lock);
309 list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
310 spin_unlock(&hrt->hrt_lock);
312 wake_up(&hrt->hrt_waitq);
313 b->rsb_n_replies = 0;
318 * Add a reply to a batch.
319 * Add one reply object to a batch, schedule batched replies if overload.
324 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
326 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
328 if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
329 if (b->rsb_svcpt != NULL) {
330 rs_batch_dispatch(b);
331 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
333 spin_lock(&svcpt->scp_rep_lock);
334 b->rsb_svcpt = svcpt;
336 spin_lock(&rs->rs_lock);
337 rs->rs_scheduled_ever = 1;
338 if (rs->rs_scheduled == 0) {
339 list_move(&rs->rs_list, &b->rsb_replies);
340 rs->rs_scheduled = 1;
343 rs->rs_committed = 1;
344 spin_unlock(&rs->rs_lock);
348 * Reply batch finalization.
349 * Dispatch remaining replies from the batch
350 * and release remaining spinlock.
354 static void rs_batch_fini(struct rs_batch *b)
356 if (b->rsb_svcpt != NULL) {
357 rs_batch_dispatch(b);
358 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
362 #define DECLARE_RS_BATCH(b) struct rs_batch b
366 * Put reply state into a queue for processing because we received
367 * ACK from the client
369 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
371 struct ptlrpc_hr_thread *hrt;
374 LASSERT(list_empty(&rs->rs_list));
376 hrt = ptlrpc_hr_select(rs->rs_svcpt);
378 spin_lock(&hrt->hrt_lock);
379 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
380 spin_unlock(&hrt->hrt_lock);
382 wake_up(&hrt->hrt_waitq);
387 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
391 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
392 assert_spin_locked(&rs->rs_lock);
393 LASSERT (rs->rs_difficult);
394 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
396 if (rs->rs_scheduled) { /* being set up or already notified */
401 rs->rs_scheduled = 1;
402 list_del_init(&rs->rs_list);
403 ptlrpc_dispatch_difficult_reply(rs);
406 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
408 void ptlrpc_commit_replies(struct obd_export *exp)
410 struct ptlrpc_reply_state *rs, *nxt;
411 DECLARE_RS_BATCH(batch);
414 rs_batch_init(&batch);
415 /* Find any replies that have been committed and get their service
416 * 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);
434 EXPORT_SYMBOL(ptlrpc_commit_replies);
437 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
439 struct ptlrpc_request_buffer_desc *rqbd;
444 spin_lock(&svcpt->scp_lock);
446 if (list_empty(&svcpt->scp_rqbd_idle)) {
447 spin_unlock(&svcpt->scp_lock);
451 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
452 struct ptlrpc_request_buffer_desc,
454 list_del(&rqbd->rqbd_list);
456 /* assume we will post successfully */
457 svcpt->scp_nrqbds_posted++;
458 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
460 spin_unlock(&svcpt->scp_lock);
462 rc = ptlrpc_register_rqbd(rqbd);
469 spin_lock(&svcpt->scp_lock);
471 svcpt->scp_nrqbds_posted--;
472 list_del(&rqbd->rqbd_list);
473 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
475 /* Don't complain if no request buffers are posted right now; LNET
476 * won't drop requests because we set the portal lazy! */
478 spin_unlock(&svcpt->scp_lock);
483 static void ptlrpc_at_timer(unsigned long castmeharder)
485 struct ptlrpc_service_part *svcpt;
487 svcpt = (struct ptlrpc_service_part *)castmeharder;
489 svcpt->scp_at_check = 1;
490 svcpt->scp_at_checktime = cfs_time_current();
491 wake_up(&svcpt->scp_waitq);
495 ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
496 struct ptlrpc_service_conf *conf)
498 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
505 * Common code for estimating & validating threads number.
506 * CPT affinity service could have percpt thread-pool instead
507 * of a global thread-pool, which means user might not always
508 * get the threads number they give it in conf::tc_nthrs_user
509 * even they did set. It's because we need to validate threads
510 * number for each CPT to guarantee each pool will have enough
511 * threads to keep the service healthy.
513 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
514 init = max_t(int, init, tc->tc_nthrs_init);
516 /* NB: please see comments in lustre_lnet.h for definition
517 * details of these members */
518 LASSERT(tc->tc_nthrs_max != 0);
520 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 */
524 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
525 nthrs = total / svc->srv_ncpts;
526 init = max(init, nthrs);
530 total = tc->tc_nthrs_max;
531 if (tc->tc_nthrs_base == 0) {
532 /* don't care about base threads number per partition,
533 * this is most for non-affinity service */
534 nthrs = total / svc->srv_ncpts;
538 nthrs = tc->tc_nthrs_base;
539 if (svc->srv_ncpts == 1) {
542 /* NB: Increase the base number if it's single partition
543 * and total number of cores/HTs is larger or equal to 4.
544 * result will always < 2 * nthrs_base */
545 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
546 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
547 (tc->tc_nthrs_base >> i) != 0; i++)
548 nthrs += tc->tc_nthrs_base >> i;
551 if (tc->tc_thr_factor != 0) {
552 int factor = tc->tc_thr_factor;
556 * User wants to increase number of threads with for
557 * each CPU core/HT, most likely the factor is larger then
558 * one thread/core because service threads are supposed to
559 * be blocked by lock or wait for IO.
562 * Amdahl's law says that adding processors wouldn't give
563 * a linear increasing of parallelism, so it's nonsense to
564 * have too many threads no matter how many cores/HTs
567 if (cfs_cpu_ht_nsiblings(0) > 1) { /* weight is # of HTs */
568 /* depress thread factor for hyper-thread */
569 factor = factor - (factor >> 1) + (factor >> 3);
572 weight = cfs_cpt_weight(svc->srv_cptable, 0);
575 for (; factor > 0 && weight > 0; factor--, weight -= fade)
576 nthrs += min(weight, fade) * factor;
579 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
580 nthrs = max(tc->tc_nthrs_base,
581 tc->tc_nthrs_max / svc->srv_ncpts);
584 nthrs = max(nthrs, tc->tc_nthrs_init);
585 svc->srv_nthrs_cpt_limit = nthrs;
586 svc->srv_nthrs_cpt_init = init;
588 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
589 CDEBUG(D_OTHER, "%s: This service may have more threads (%d) "
590 "than the given soft limit (%d)\n",
591 svc->srv_name, nthrs * svc->srv_ncpts,
597 * Initialize percpt data for a service
600 ptlrpc_service_part_init(struct ptlrpc_service *svc,
601 struct ptlrpc_service_part *svcpt, int cpt)
603 struct ptlrpc_at_array *array;
608 svcpt->scp_cpt = cpt;
609 INIT_LIST_HEAD(&svcpt->scp_threads);
611 /* rqbd and incoming request queue */
612 spin_lock_init(&svcpt->scp_lock);
613 INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
614 INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
615 INIT_LIST_HEAD(&svcpt->scp_req_incoming);
616 init_waitqueue_head(&svcpt->scp_waitq);
617 /* history request & rqbd list */
618 INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
619 INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
621 /* acitve requests and hp requests */
622 spin_lock_init(&svcpt->scp_req_lock);
625 spin_lock_init(&svcpt->scp_rep_lock);
626 INIT_LIST_HEAD(&svcpt->scp_rep_active);
627 INIT_LIST_HEAD(&svcpt->scp_rep_idle);
628 init_waitqueue_head(&svcpt->scp_rep_waitq);
629 atomic_set(&svcpt->scp_nreps_difficult, 0);
631 /* adaptive timeout */
632 spin_lock_init(&svcpt->scp_at_lock);
633 array = &svcpt->scp_at_array;
635 size = at_est2timeout(at_max);
636 array->paa_size = size;
637 array->paa_count = 0;
638 array->paa_deadline = -1;
640 /* allocate memory for scp_at_array (ptlrpc_at_array) */
641 OBD_CPT_ALLOC(array->paa_reqs_array,
642 svc->srv_cptable, cpt, sizeof(struct list_head) * size);
643 if (array->paa_reqs_array == NULL)
646 for (index = 0; index < size; index++)
647 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
649 OBD_CPT_ALLOC(array->paa_reqs_count,
650 svc->srv_cptable, cpt, sizeof(__u32) * size);
651 if (array->paa_reqs_count == NULL)
654 cfs_timer_init(&svcpt->scp_at_timer, ptlrpc_at_timer, svcpt);
655 /* At SOW, service time should be quick; 10s seems generous. If client
656 * timeout is less than this, we'll be sending an early reply. */
657 at_init(&svcpt->scp_at_estimate, 10, 0);
659 /* assign this before call ptlrpc_grow_req_bufs */
660 svcpt->scp_service = svc;
661 /* Now allocate the request buffers, but don't post them now */
662 rc = ptlrpc_grow_req_bufs(svcpt, 0);
663 /* We shouldn't be under memory pressure at startup, so
664 * fail if we can't allocate all our buffers at this time. */
671 if (array->paa_reqs_count != NULL) {
672 OBD_FREE(array->paa_reqs_count, sizeof(__u32) * size);
673 array->paa_reqs_count = NULL;
676 if (array->paa_reqs_array != NULL) {
677 OBD_FREE(array->paa_reqs_array,
678 sizeof(struct list_head) * array->paa_size);
679 array->paa_reqs_array = NULL;
686 * Initialize service on a given portal.
687 * This includes starting serving threads , allocating and posting rqbds and
690 struct ptlrpc_service *
691 ptlrpc_register_service(struct ptlrpc_service_conf *conf,
692 struct proc_dir_entry *proc_entry)
694 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
695 struct ptlrpc_service *service;
696 struct ptlrpc_service_part *svcpt;
697 struct cfs_cpt_table *cptable;
705 LASSERT(conf->psc_buf.bc_nbufs > 0);
706 LASSERT(conf->psc_buf.bc_buf_size >=
707 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
708 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
710 cptable = cconf->cc_cptable;
712 cptable = cfs_cpt_table;
714 if (!conf->psc_thr.tc_cpu_affinity) {
717 ncpts = cfs_cpt_number(cptable);
718 if (cconf->cc_pattern != NULL) {
719 struct cfs_expr_list *el;
721 rc = cfs_expr_list_parse(cconf->cc_pattern,
722 strlen(cconf->cc_pattern),
725 CERROR("%s: invalid CPT pattern string: %s",
726 conf->psc_name, cconf->cc_pattern);
727 RETURN(ERR_PTR(-EINVAL));
730 rc = cfs_expr_list_values(el, ncpts, &cpts);
731 cfs_expr_list_free(el);
733 CERROR("%s: failed to parse CPT array %s: %d\n",
734 conf->psc_name, cconf->cc_pattern, rc);
736 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
737 RETURN(ERR_PTR(rc < 0 ? rc : -EINVAL));
743 OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
744 if (service == NULL) {
746 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
747 RETURN(ERR_PTR(-ENOMEM));
750 service->srv_cptable = cptable;
751 service->srv_cpts = cpts;
752 service->srv_ncpts = ncpts;
754 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
755 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
756 service->srv_cpt_bits++;
759 spin_lock_init(&service->srv_lock);
760 service->srv_name = conf->psc_name;
761 service->srv_watchdog_factor = conf->psc_watchdog_factor;
762 INIT_LIST_HEAD(&service->srv_list); /* for safty of cleanup */
764 /* buffer configuration */
765 service->srv_nbuf_per_group = test_req_buffer_pressure ?
766 1 : conf->psc_buf.bc_nbufs;
767 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
769 service->srv_buf_size = conf->psc_buf.bc_buf_size;
770 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
771 service->srv_req_portal = conf->psc_buf.bc_req_portal;
773 /* Increase max reply size to next power of two */
774 service->srv_max_reply_size = 1;
775 while (service->srv_max_reply_size <
776 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
777 service->srv_max_reply_size <<= 1;
779 service->srv_thread_name = conf->psc_thr.tc_thr_name;
780 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
781 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
782 service->srv_ops = conf->psc_ops;
784 for (i = 0; i < ncpts; i++) {
785 if (!conf->psc_thr.tc_cpu_affinity)
788 cpt = cpts != NULL ? cpts[i] : i;
790 OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
792 GOTO(failed, rc = -ENOMEM);
794 service->srv_parts[i] = svcpt;
795 rc = ptlrpc_service_part_init(service, svcpt, cpt);
800 ptlrpc_server_nthreads_check(service, conf);
802 rc = LNetSetLazyPortal(service->srv_req_portal);
805 mutex_lock(&ptlrpc_all_services_mutex);
806 list_add(&service->srv_list, &ptlrpc_all_services);
807 mutex_unlock(&ptlrpc_all_services_mutex);
809 if (proc_entry != NULL)
810 ptlrpc_lprocfs_register_service(proc_entry, service);
812 rc = ptlrpc_service_nrs_setup(service);
816 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
817 service->srv_name, service->srv_req_portal);
819 rc = ptlrpc_start_threads(service);
821 CERROR("Failed to start threads for service %s: %d\n",
822 service->srv_name, rc);
828 ptlrpc_unregister_service(service);
831 EXPORT_SYMBOL(ptlrpc_register_service);
834 * to actually free the request, must be called without holding svc_lock.
835 * note it's caller's responsibility to unlink req->rq_list.
837 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
839 LASSERT(atomic_read(&req->rq_refcount) == 0);
840 LASSERT(list_empty(&req->rq_timed_list));
842 /* DEBUG_REQ() assumes the reply state of a request with a valid
843 * ref will not be destroyed until that reference is dropped. */
844 ptlrpc_req_drop_rs(req);
846 sptlrpc_svc_ctx_decref(req);
848 if (req != &req->rq_rqbd->rqbd_req) {
849 /* NB request buffers use an embedded
850 * req if the incoming req unlinked the
851 * MD; this isn't one of them! */
852 ptlrpc_request_cache_free(req);
857 * drop a reference count of the request. if it reaches 0, we either
858 * put it into history list, or free it immediately.
860 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
862 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
863 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
864 struct ptlrpc_service *svc = svcpt->scp_service;
866 struct list_head *tmp;
867 struct list_head *nxt;
869 if (!atomic_dec_and_test(&req->rq_refcount))
872 if (req->rq_session.lc_state == LCS_ENTERED) {
873 lu_context_exit(&req->rq_session);
874 lu_context_fini(&req->rq_session);
877 if (req->rq_at_linked) {
878 spin_lock(&svcpt->scp_at_lock);
879 /* recheck with lock, in case it's unlinked by
880 * ptlrpc_at_check_timed() */
881 if (likely(req->rq_at_linked))
882 ptlrpc_at_remove_timed(req);
883 spin_unlock(&svcpt->scp_at_lock);
886 LASSERT(list_empty(&req->rq_timed_list));
888 /* finalize request */
889 if (req->rq_export) {
890 class_export_put(req->rq_export);
891 req->rq_export = NULL;
894 spin_lock(&svcpt->scp_lock);
896 list_add(&req->rq_list, &rqbd->rqbd_reqs);
898 refcount = --(rqbd->rqbd_refcount);
900 /* request buffer is now idle: add to history */
901 list_del(&rqbd->rqbd_list);
903 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
904 svcpt->scp_hist_nrqbds++;
906 /* cull some history?
907 * I expect only about 1 or 2 rqbds need to be recycled here */
908 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
909 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
910 struct ptlrpc_request_buffer_desc,
913 list_del(&rqbd->rqbd_list);
914 svcpt->scp_hist_nrqbds--;
916 /* remove rqbd's reqs from svc's req history while
917 * I've got the service lock */
918 list_for_each(tmp, &rqbd->rqbd_reqs) {
919 req = list_entry(tmp, struct ptlrpc_request,
921 /* Track the highest culled req seq */
922 if (req->rq_history_seq >
923 svcpt->scp_hist_seq_culled) {
924 svcpt->scp_hist_seq_culled =
927 list_del(&req->rq_history_list);
930 spin_unlock(&svcpt->scp_lock);
932 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
933 req = list_entry(rqbd->rqbd_reqs.next,
934 struct ptlrpc_request,
936 list_del(&req->rq_list);
937 ptlrpc_server_free_request(req);
940 spin_lock(&svcpt->scp_lock);
942 * now all reqs including the embedded req has been
943 * disposed, schedule request buffer for re-use.
945 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == 0);
946 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
949 spin_unlock(&svcpt->scp_lock);
950 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
951 /* If we are low on memory, we are not interested in history */
952 list_del(&req->rq_list);
953 list_del_init(&req->rq_history_list);
955 /* Track the highest culled req seq */
956 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
957 svcpt->scp_hist_seq_culled = req->rq_history_seq;
959 spin_unlock(&svcpt->scp_lock);
961 ptlrpc_server_free_request(req);
963 spin_unlock(&svcpt->scp_lock);
967 /** Change request export and move hp request from old export to new */
968 void ptlrpc_request_change_export(struct ptlrpc_request *req,
969 struct obd_export *export)
971 if (req->rq_export != NULL) {
972 LASSERT(!list_empty(&req->rq_exp_list));
973 /* remove rq_exp_list from last export */
974 spin_lock_bh(&req->rq_export->exp_rpc_lock);
975 list_del_init(&req->rq_exp_list);
976 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
977 /* export has one reference already, so it`s safe to
978 * add req to export queue here and get another
979 * reference for request later */
980 spin_lock_bh(&export->exp_rpc_lock);
981 if (req->rq_ops != NULL) /* hp request */
982 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
984 list_add(&req->rq_exp_list, &export->exp_reg_rpcs);
985 spin_unlock_bh(&export->exp_rpc_lock);
987 class_export_rpc_dec(req->rq_export);
988 class_export_put(req->rq_export);
991 /* request takes one export refcount */
992 req->rq_export = class_export_get(export);
993 class_export_rpc_inc(export);
999 * to finish a request: stop sending more early replies, and release
1002 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
1003 struct ptlrpc_request *req)
1005 ptlrpc_server_hpreq_fini(req);
1007 ptlrpc_server_drop_request(req);
1011 * to finish a active request: stop sending more early replies, and release
1012 * the request. should be called after we finished handling the request.
1014 static void ptlrpc_server_finish_active_request(
1015 struct ptlrpc_service_part *svcpt,
1016 struct ptlrpc_request *req)
1018 spin_lock(&svcpt->scp_req_lock);
1019 ptlrpc_nrs_req_stop_nolock(req);
1020 svcpt->scp_nreqs_active--;
1022 svcpt->scp_nhreqs_active--;
1023 spin_unlock(&svcpt->scp_req_lock);
1025 ptlrpc_nrs_req_finalize(req);
1027 if (req->rq_export != NULL)
1028 class_export_rpc_dec(req->rq_export);
1030 ptlrpc_server_finish_request(svcpt, req);
1034 * This function makes sure dead exports are evicted in a timely manner.
1035 * This function is only called when some export receives a message (i.e.,
1036 * the network is up.)
1038 void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
1040 struct obd_export *oldest_exp;
1041 time_t oldest_time, new_time;
1047 /* Compensate for slow machines, etc, by faking our request time
1048 into the future. Although this can break the strict time-ordering
1049 of the list, we can be really lazy here - we don't have to evict
1050 at the exact right moment. Eventually, all silent exports
1051 will make it to the top of the list. */
1053 /* Do not pay attention on 1sec or smaller renewals. */
1054 new_time = cfs_time_current_sec() + extra_delay;
1055 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1058 exp->exp_last_request_time = new_time;
1060 /* exports may get disconnected from the chain even though the
1061 export has references, so we must keep the spin lock while
1062 manipulating the lists */
1063 spin_lock(&exp->exp_obd->obd_dev_lock);
1065 if (list_empty(&exp->exp_obd_chain_timed)) {
1066 /* this one is not timed */
1067 spin_unlock(&exp->exp_obd->obd_dev_lock);
1071 list_move_tail(&exp->exp_obd_chain_timed,
1072 &exp->exp_obd->obd_exports_timed);
1074 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1075 struct obd_export, exp_obd_chain_timed);
1076 oldest_time = oldest_exp->exp_last_request_time;
1077 spin_unlock(&exp->exp_obd->obd_dev_lock);
1079 if (exp->exp_obd->obd_recovering) {
1080 /* be nice to everyone during recovery */
1085 /* Note - racing to start/reset the obd_eviction timer is safe */
1086 if (exp->exp_obd->obd_eviction_timer == 0) {
1087 /* Check if the oldest entry is expired. */
1088 if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
1090 /* We need a second timer, in case the net was down and
1091 * it just came back. Since the pinger may skip every
1092 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1093 * we better wait for 3. */
1094 exp->exp_obd->obd_eviction_timer =
1095 cfs_time_current_sec() + 3 * PING_INTERVAL;
1096 CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
1097 exp->exp_obd->obd_name,
1098 obd_export_nid2str(oldest_exp), oldest_time);
1101 if (cfs_time_current_sec() >
1102 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1103 /* The evictor won't evict anyone who we've heard from
1104 * recently, so we don't have to check before we start
1106 if (!ping_evictor_wake(exp))
1107 exp->exp_obd->obd_eviction_timer = 0;
1113 EXPORT_SYMBOL(ptlrpc_update_export_timer);
1116 * Sanity check request \a req.
1117 * Return 0 if all is ok, error code otherwise.
1119 static int ptlrpc_check_req(struct ptlrpc_request *req)
1121 struct obd_device *obd = req->rq_export->exp_obd;
1124 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1125 req->rq_export->exp_conn_cnt)) {
1126 DEBUG_REQ(D_RPCTRACE, req,
1127 "DROPPING req from old connection %d < %d",
1128 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1129 req->rq_export->exp_conn_cnt);
1132 if (unlikely(obd == NULL || obd->obd_fail)) {
1133 /* Failing over, don't handle any more reqs,
1134 * send error response instead. */
1135 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1136 req, (obd != NULL) ? obd->obd_name : "unknown");
1138 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1139 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1140 !obd->obd_recovering) {
1141 DEBUG_REQ(D_ERROR, req,
1142 "Invalid replay without recovery");
1143 class_fail_export(req->rq_export);
1145 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1146 !obd->obd_recovering) {
1147 DEBUG_REQ(D_ERROR, req, "Invalid req with transno "
1148 LPU64" without recovery",
1149 lustre_msg_get_transno(req->rq_reqmsg));
1150 class_fail_export(req->rq_export);
1154 if (unlikely(rc < 0)) {
1155 req->rq_status = rc;
1161 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1163 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1166 if (array->paa_count == 0) {
1167 cfs_timer_disarm(&svcpt->scp_at_timer);
1171 /* Set timer for closest deadline */
1172 next = (__s32)(array->paa_deadline - cfs_time_current_sec() -
1175 ptlrpc_at_timer((unsigned long)svcpt);
1177 cfs_timer_arm(&svcpt->scp_at_timer, cfs_time_shift(next));
1178 CDEBUG(D_INFO, "armed %s at %+ds\n",
1179 svcpt->scp_service->srv_name, next);
1183 /* Add rpc to early reply check list */
1184 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1186 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1187 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1188 struct ptlrpc_request *rq = NULL;
1194 if (req->rq_no_reply)
1197 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1200 spin_lock(&svcpt->scp_at_lock);
1201 LASSERT(list_empty(&req->rq_timed_list));
1203 index = (unsigned long)req->rq_deadline % array->paa_size;
1204 if (array->paa_reqs_count[index] > 0) {
1205 /* latest rpcs will have the latest deadlines in the list,
1206 * so search backward. */
1207 list_for_each_entry_reverse(rq,
1208 &array->paa_reqs_array[index],
1210 if (req->rq_deadline >= rq->rq_deadline) {
1211 list_add(&req->rq_timed_list,
1212 &rq->rq_timed_list);
1218 /* Add the request at the head of the list */
1219 if (list_empty(&req->rq_timed_list))
1220 list_add(&req->rq_timed_list,
1221 &array->paa_reqs_array[index]);
1223 spin_lock(&req->rq_lock);
1224 req->rq_at_linked = 1;
1225 spin_unlock(&req->rq_lock);
1226 req->rq_at_index = index;
1227 array->paa_reqs_count[index]++;
1229 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1230 array->paa_deadline = req->rq_deadline;
1231 ptlrpc_at_set_timer(svcpt);
1233 spin_unlock(&svcpt->scp_at_lock);
1239 ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1241 struct ptlrpc_at_array *array;
1243 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1245 /* NB: must call with hold svcpt::scp_at_lock */
1246 LASSERT(!list_empty(&req->rq_timed_list));
1247 list_del_init(&req->rq_timed_list);
1249 spin_lock(&req->rq_lock);
1250 req->rq_at_linked = 0;
1251 spin_unlock(&req->rq_lock);
1253 array->paa_reqs_count[req->rq_at_index]--;
1258 * Attempt to extend the request deadline by sending an early reply to the
1261 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1263 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1264 struct ptlrpc_request *reqcopy;
1265 struct lustre_msg *reqmsg;
1266 cfs_duration_t olddl = req->rq_deadline - cfs_time_current_sec();
1270 if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_RECONNECT)) {
1271 /* don't send early reply */
1275 /* deadline is when the client expects us to reply, margin is the
1276 difference between clients' and servers' expectations */
1277 DEBUG_REQ(D_ADAPTTO, req,
1278 "%ssending early reply (deadline %+lds, margin %+lds) for "
1279 "%d+%d", AT_OFF ? "AT off - not " : "",
1280 olddl, olddl - at_get(&svcpt->scp_at_estimate),
1281 at_get(&svcpt->scp_at_estimate), at_extra);
1287 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), "
1288 "not sending early reply. Consider increasing "
1289 "at_early_margin (%d)?", olddl, at_early_margin);
1291 /* Return an error so we're not re-added to the timed list. */
1295 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
1296 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
1297 "but no AT support");
1301 if (req->rq_export &&
1302 lustre_msg_get_flags(req->rq_reqmsg) &
1303 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1304 /* During recovery, we don't want to send too many early
1305 * replies, but on the other hand we want to make sure the
1306 * client has enough time to resend if the rpc is lost. So
1307 * during the recovery period send at least 4 early replies,
1308 * spacing them every at_extra if we can. at_estimate should
1309 * always equal this fixed value during recovery. */
1310 at_measured(&svcpt->scp_at_estimate,
1311 cfs_time_current_sec() -
1312 req->rq_arrival_time.tv_sec + min(at_extra,
1313 req->rq_export->exp_obd->obd_recovery_timeout / 4));
1315 /* We want to extend the request deadline by at_extra seconds,
1316 * so we set our service estimate to reflect how much time has
1317 * passed since this request arrived plus an additional
1318 * at_extra seconds. The client will calculate the new deadline
1319 * based on this service estimate (plus some additional time to
1320 * account for network latency). See ptlrpc_at_recv_early_reply
1322 at_measured(&svcpt->scp_at_estimate, at_extra +
1323 cfs_time_current_sec() -
1324 req->rq_arrival_time.tv_sec);
1327 /* Check to see if we've actually increased the deadline -
1328 * we may be past adaptive_max */
1329 if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
1330 at_get(&svcpt->scp_at_estimate)) {
1331 DEBUG_REQ(D_WARNING, req, "Couldn't add any time "
1332 "(%ld/%ld), not sending early reply\n",
1333 olddl, req->rq_arrival_time.tv_sec +
1334 at_get(&svcpt->scp_at_estimate) -
1335 cfs_time_current_sec());
1339 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1340 if (reqcopy == NULL)
1342 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1344 GOTO(out_free, rc = -ENOMEM);
1347 reqcopy->rq_reply_state = NULL;
1348 reqcopy->rq_rep_swab_mask = 0;
1349 reqcopy->rq_pack_bulk = 0;
1350 reqcopy->rq_pack_udesc = 0;
1351 reqcopy->rq_packed_final = 0;
1352 sptlrpc_svc_ctx_addref(reqcopy);
1353 /* We only need the reqmsg for the magic */
1354 reqcopy->rq_reqmsg = reqmsg;
1355 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1357 LASSERT(atomic_read(&req->rq_refcount));
1358 /** if it is last refcount then early reply isn't needed */
1359 if (atomic_read(&req->rq_refcount) == 1) {
1360 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1361 "abort sending early reply\n");
1362 GOTO(out, rc = -EINVAL);
1365 /* Connection ref */
1366 reqcopy->rq_export = class_conn2export(
1367 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1368 if (reqcopy->rq_export == NULL)
1369 GOTO(out, rc = -ENODEV);
1372 class_export_rpc_inc(reqcopy->rq_export);
1373 if (reqcopy->rq_export->exp_obd &&
1374 reqcopy->rq_export->exp_obd->obd_fail)
1375 GOTO(out_put, rc = -ENODEV);
1377 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1381 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1384 /* Adjust our own deadline to what we told the client */
1385 req->rq_deadline = req->rq_arrival_time.tv_sec +
1386 at_get(&svcpt->scp_at_estimate);
1387 req->rq_early_count++; /* number sent, server side */
1389 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1392 /* Free the (early) reply state from lustre_pack_reply.
1393 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1394 ptlrpc_req_drop_rs(reqcopy);
1397 class_export_rpc_dec(reqcopy->rq_export);
1398 class_export_put(reqcopy->rq_export);
1400 sptlrpc_svc_ctx_decref(reqcopy);
1401 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1403 ptlrpc_request_cache_free(reqcopy);
1407 /* Send early replies to everybody expiring within at_early_margin
1408 asking for at_extra time */
1409 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1411 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1412 struct ptlrpc_request *rq, *n;
1413 struct list_head work_list;
1416 time_t now = cfs_time_current_sec();
1417 cfs_duration_t delay;
1418 int first, counter = 0;
1421 spin_lock(&svcpt->scp_at_lock);
1422 if (svcpt->scp_at_check == 0) {
1423 spin_unlock(&svcpt->scp_at_lock);
1426 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1427 svcpt->scp_at_check = 0;
1429 if (array->paa_count == 0) {
1430 spin_unlock(&svcpt->scp_at_lock);
1434 /* The timer went off, but maybe the nearest rpc already completed. */
1435 first = array->paa_deadline - now;
1436 if (first > at_early_margin) {
1437 /* We've still got plenty of time. Reset the timer. */
1438 ptlrpc_at_set_timer(svcpt);
1439 spin_unlock(&svcpt->scp_at_lock);
1443 /* We're close to a timeout, and we don't know how much longer the
1444 server will take. Send early replies to everyone expiring soon. */
1445 INIT_LIST_HEAD(&work_list);
1447 index = (unsigned long)array->paa_deadline % array->paa_size;
1448 count = array->paa_count;
1450 count -= array->paa_reqs_count[index];
1451 list_for_each_entry_safe(rq, n,
1452 &array->paa_reqs_array[index],
1454 if (rq->rq_deadline > now + at_early_margin) {
1455 /* update the earliest deadline */
1456 if (deadline == -1 ||
1457 rq->rq_deadline < deadline)
1458 deadline = rq->rq_deadline;
1462 ptlrpc_at_remove_timed(rq);
1464 * ptlrpc_server_drop_request() may drop
1465 * refcount to 0 already. Let's check this and
1466 * don't add entry to work_list
1468 if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
1469 list_add(&rq->rq_timed_list, &work_list);
1473 if (++index >= array->paa_size)
1476 array->paa_deadline = deadline;
1477 /* we have a new earliest deadline, restart the timer */
1478 ptlrpc_at_set_timer(svcpt);
1480 spin_unlock(&svcpt->scp_at_lock);
1482 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1483 "replies\n", first, at_extra, counter);
1485 /* We're already past request deadlines before we even get a
1486 chance to send early replies */
1487 LCONSOLE_WARN("%s: This server is not able to keep up with "
1488 "request traffic (cpu-bound).\n",
1489 svcpt->scp_service->srv_name);
1490 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
1491 "delay="CFS_DURATION_T"(jiff)\n",
1492 counter, svcpt->scp_nreqs_incoming,
1493 svcpt->scp_nreqs_active,
1494 at_get(&svcpt->scp_at_estimate), delay);
1497 /* we took additional refcount so entries can't be deleted from list, no
1498 * locking is needed */
1499 while (!list_empty(&work_list)) {
1500 rq = list_entry(work_list.next, struct ptlrpc_request,
1502 list_del_init(&rq->rq_timed_list);
1504 if (ptlrpc_at_send_early_reply(rq) == 0)
1505 ptlrpc_at_add_timed(rq);
1507 ptlrpc_server_drop_request(rq);
1510 RETURN(1); /* return "did_something" for liblustre */
1513 /* Check if we are already handling earlier incarnation of this request.
1514 * Called under &req->rq_export->exp_rpc_lock locked */
1515 static int ptlrpc_server_check_resend_in_progress(struct ptlrpc_request *req)
1517 struct ptlrpc_request *tmp = NULL;
1519 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ||
1520 (atomic_read(&req->rq_export->exp_rpc_count) == 0))
1523 /* bulk request are aborted upon reconnect, don't try to
1525 if (req->rq_bulk_write || req->rq_bulk_read)
1528 /* This list should not be longer than max_requests in
1529 * flights on the client, so it is not all that long.
1530 * Also we only hit this codepath in case of a resent
1531 * request which makes it even more rarely hit */
1532 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs,
1534 /* Found duplicate one */
1535 if (tmp->rq_xid == req->rq_xid)
1538 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs,
1540 /* Found duplicate one */
1541 if (tmp->rq_xid == req->rq_xid)
1547 DEBUG_REQ(D_HA, req, "Found duplicate req in processing");
1548 DEBUG_REQ(D_HA, tmp, "Request being processed");
1553 * Put the request to the export list if the request may become
1554 * a high priority one.
1556 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1557 struct ptlrpc_request *req)
1559 struct list_head *list;
1564 if (svcpt->scp_service->srv_ops.so_hpreq_handler) {
1565 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1570 if (req->rq_export) {
1572 /* Perform request specific check. We should do this
1573 * check before the request is added into exp_hp_rpcs
1574 * list otherwise it may hit swab race at LU-1044. */
1575 if (req->rq_ops->hpreq_check) {
1576 rc = req->rq_ops->hpreq_check(req);
1578 * XXX: Out of all current
1579 * ptlrpc_hpreq_ops::hpreq_check(), only
1580 * ldlm_cancel_hpreq_check() can return an
1581 * error code; other functions assert in
1582 * similar places, which seems odd.
1583 * What also does not seem right is that
1584 * handlers for those RPCs do not assert
1585 * on the same checks, but rather handle the
1586 * error cases. e.g. see ost_rw_hpreq_check(),
1587 * and ost_brw_read(), ost_brw_write().
1591 LASSERT(rc == 0 || rc == 1);
1594 list = &req->rq_export->exp_hp_rpcs;
1596 list = &req->rq_export->exp_reg_rpcs;
1599 /* do search for duplicated xid and the adding to the list
1601 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1602 rc = ptlrpc_server_check_resend_in_progress(req);
1604 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1607 list_add(&req->rq_exp_list, list);
1608 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1611 ptlrpc_nrs_req_initialize(svcpt, req, !!hp);
1616 /** Remove the request from the export list. */
1617 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1620 if (req->rq_export) {
1621 /* refresh lock timeout again so that client has more
1622 * room to send lock cancel RPC. */
1623 if (req->rq_ops && req->rq_ops->hpreq_fini)
1624 req->rq_ops->hpreq_fini(req);
1626 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1627 list_del_init(&req->rq_exp_list);
1628 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1633 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1638 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1639 .hpreq_check = ptlrpc_hpreq_check,
1642 /* Hi-Priority RPC check by RPC operation code. */
1643 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1645 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1647 /* Check for export to let only reconnects for not yet evicted
1648 * export to become a HP rpc. */
1649 if ((req->rq_export != NULL) &&
1650 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1651 req->rq_ops = &ptlrpc_hpreq_common;
1655 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1657 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1658 struct ptlrpc_request *req)
1663 rc = ptlrpc_server_hpreq_init(svcpt, req);
1667 /* the current thread is not the processing thread for this request
1668 * since that, but request is in exp_hp_list and can be find there.
1669 * Remove all relations between request and old thread. */
1670 req->rq_svc_thread->t_env->le_ses = NULL;
1671 req->rq_svc_thread = NULL;
1672 req->rq_session.lc_thread = NULL;
1674 ptlrpc_nrs_req_add(svcpt, req, !!rc);
1680 * Allow to handle high priority request
1681 * User can call it w/o any lock but need to hold
1682 * ptlrpc_service_part::scp_req_lock to get reliable result
1684 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1687 int running = svcpt->scp_nthrs_running;
1689 if (!nrs_svcpt_has_hp(svcpt))
1695 if (ptlrpc_nrs_req_throttling_nolock(svcpt, true))
1698 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1699 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1700 /* leave just 1 thread for normal RPCs */
1701 running = PTLRPC_NTHRS_INIT;
1702 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1706 if (svcpt->scp_nreqs_active >= running - 1)
1709 if (svcpt->scp_nhreqs_active == 0)
1712 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1713 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1716 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1719 return ptlrpc_server_allow_high(svcpt, force) &&
1720 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1724 * Only allow normal priority requests on a service that has a high-priority
1725 * queue if forced (i.e. cleanup), if there are other high priority requests
1726 * already being processed (i.e. those threads can service more high-priority
1727 * requests), or if there are enough idle threads that a later thread can do
1728 * a high priority request.
1729 * User can call it w/o any lock but need to hold
1730 * ptlrpc_service_part::scp_req_lock to get reliable result
1732 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1735 int running = svcpt->scp_nthrs_running;
1736 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1737 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1738 /* leave just 1 thread for normal RPCs */
1739 running = PTLRPC_NTHRS_INIT;
1740 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1747 if (ptlrpc_nrs_req_throttling_nolock(svcpt, false))
1750 if (svcpt->scp_nreqs_active < running - 2)
1753 if (svcpt->scp_nreqs_active >= running - 1)
1756 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1759 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1762 return ptlrpc_server_allow_normal(svcpt, force) &&
1763 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1767 * Returns true if there are requests available in incoming
1768 * request queue for processing and it is allowed to fetch them.
1769 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1770 * to get reliable result
1771 * \see ptlrpc_server_allow_normal
1772 * \see ptlrpc_server_allow high
1775 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1777 return ptlrpc_server_high_pending(svcpt, force) ||
1778 ptlrpc_server_normal_pending(svcpt, force);
1782 * Fetch a request for processing from queue of unprocessed requests.
1783 * Favors high-priority requests.
1784 * Returns a pointer to fetched request.
1786 static struct ptlrpc_request *
1787 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1789 struct ptlrpc_request *req = NULL;
1792 spin_lock(&svcpt->scp_req_lock);
1794 if (ptlrpc_server_high_pending(svcpt, force)) {
1795 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1797 svcpt->scp_hreq_count++;
1802 if (ptlrpc_server_normal_pending(svcpt, force)) {
1803 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1805 svcpt->scp_hreq_count = 0;
1810 spin_unlock(&svcpt->scp_req_lock);
1814 svcpt->scp_nreqs_active++;
1816 svcpt->scp_nhreqs_active++;
1818 spin_unlock(&svcpt->scp_req_lock);
1820 if (likely(req->rq_export))
1821 class_export_rpc_inc(req->rq_export);
1827 * Handle freshly incoming reqs, add to timed early reply list,
1828 * pass on to regular request queue.
1829 * All incoming requests pass through here before getting into
1830 * ptlrpc_server_handle_req later on.
1833 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1834 struct ptlrpc_thread *thread)
1836 struct ptlrpc_service *svc = svcpt->scp_service;
1837 struct ptlrpc_request *req;
1842 spin_lock(&svcpt->scp_lock);
1843 if (list_empty(&svcpt->scp_req_incoming)) {
1844 spin_unlock(&svcpt->scp_lock);
1848 req = list_entry(svcpt->scp_req_incoming.next,
1849 struct ptlrpc_request, rq_list);
1850 list_del_init(&req->rq_list);
1851 svcpt->scp_nreqs_incoming--;
1852 /* Consider this still a "queued" request as far as stats are
1854 spin_unlock(&svcpt->scp_lock);
1856 /* go through security check/transform */
1857 rc = sptlrpc_svc_unwrap_request(req);
1861 case SECSVC_COMPLETE:
1862 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1871 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1872 * redo it wouldn't be harmful.
1874 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1875 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1877 CERROR("error unpacking request: ptl %d from %s "
1878 "x"LPU64"\n", svc->srv_req_portal,
1879 libcfs_id2str(req->rq_peer), req->rq_xid);
1884 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1886 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1887 LPU64"\n", svc->srv_req_portal,
1888 libcfs_id2str(req->rq_peer), req->rq_xid);
1892 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1893 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1894 CERROR("drop incoming rpc opc %u, x"LPU64"\n",
1895 cfs_fail_val, req->rq_xid);
1900 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1901 CERROR("wrong packet type received (type=%u) from %s\n",
1902 lustre_msg_get_type(req->rq_reqmsg),
1903 libcfs_id2str(req->rq_peer));
1907 switch(lustre_msg_get_opc(req->rq_reqmsg)) {
1910 req->rq_bulk_write = 1;
1914 case MGS_CONFIG_READ:
1915 req->rq_bulk_read = 1;
1919 CDEBUG(D_RPCTRACE, "got req x"LPU64"\n", req->rq_xid);
1921 req->rq_export = class_conn2export(
1922 lustre_msg_get_handle(req->rq_reqmsg));
1923 if (req->rq_export) {
1924 rc = ptlrpc_check_req(req);
1926 rc = sptlrpc_target_export_check(req->rq_export, req);
1928 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1929 "illegal security flavor,");
1934 ptlrpc_update_export_timer(req->rq_export, 0);
1937 /* req_in handling should/must be fast */
1938 if (cfs_time_current_sec() - req->rq_arrival_time.tv_sec > 5)
1939 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1940 cfs_time_sub(cfs_time_current_sec(),
1941 req->rq_arrival_time.tv_sec));
1943 /* Set rpc server deadline and add it to the timed list */
1944 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1945 MSGHDR_AT_SUPPORT) ?
1946 /* The max time the client expects us to take */
1947 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1948 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1949 if (unlikely(deadline == 0)) {
1950 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1954 /* Skip early reply */
1955 if (OBD_FAIL_PRECHECK(OBD_FAIL_MDS_RESEND))
1956 req->rq_deadline += obd_timeout;
1958 req->rq_svc_thread = thread;
1959 if (thread != NULL) {
1960 /* initialize request session, it is needed for request
1961 * processing by target */
1962 rc = lu_context_init(&req->rq_session, LCT_SERVER_SESSION |
1965 CERROR("%s: failure to initialize session: rc = %d\n",
1966 thread->t_name, rc);
1969 req->rq_session.lc_thread = thread;
1970 lu_context_enter(&req->rq_session);
1971 thread->t_env->le_ses = &req->rq_session;
1974 ptlrpc_at_add_timed(req);
1976 /* Move it over to the request processing queue */
1977 rc = ptlrpc_server_request_add(svcpt, req);
1981 wake_up(&svcpt->scp_waitq);
1985 ptlrpc_server_finish_request(svcpt, req);
1991 * Main incoming request handling logic.
1992 * Calls handler function from service to do actual processing.
1995 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
1996 struct ptlrpc_thread *thread)
1998 struct ptlrpc_service *svc = svcpt->scp_service;
1999 struct ptlrpc_request *request;
2000 struct timeval work_start;
2001 struct timeval work_end;
2007 request = ptlrpc_server_request_get(svcpt, false);
2008 if (request == NULL)
2011 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
2012 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
2013 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
2014 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
2016 if (unlikely(fail_opc)) {
2017 if (request->rq_export && request->rq_ops)
2018 OBD_FAIL_TIMEOUT(fail_opc, 4);
2021 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
2023 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
2024 libcfs_debug_dumplog();
2026 do_gettimeofday(&work_start);
2027 timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
2028 if (likely(svc->srv_stats != NULL)) {
2029 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
2031 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
2032 svcpt->scp_nreqs_incoming);
2033 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
2034 svcpt->scp_nreqs_active);
2035 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
2036 at_get(&svcpt->scp_at_estimate));
2039 if (likely(request->rq_export)) {
2040 if (unlikely(ptlrpc_check_req(request)))
2042 ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
2045 /* Discard requests queued for longer than the deadline.
2046 The deadline is increased if we send an early reply. */
2047 if (cfs_time_current_sec() > request->rq_deadline) {
2048 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s"
2049 ": deadline "CFS_DURATION_T":"CFS_DURATION_T"s ago\n",
2050 libcfs_id2str(request->rq_peer),
2051 cfs_time_sub(request->rq_deadline,
2052 request->rq_arrival_time.tv_sec),
2053 cfs_time_sub(cfs_time_current_sec(),
2054 request->rq_deadline));
2058 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
2059 "%s:%s+%d:%d:x"LPU64":%s:%d\n", current_comm(),
2060 (request->rq_export ?
2061 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2062 (request->rq_export ?
2063 atomic_read(&request->rq_export->exp_refcount) : -99),
2064 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
2065 libcfs_id2str(request->rq_peer),
2066 lustre_msg_get_opc(request->rq_reqmsg));
2068 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
2069 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
2071 CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
2073 /* re-assign request and sesson thread to the current one */
2074 request->rq_svc_thread = thread;
2075 if (thread != NULL) {
2076 LASSERT(request->rq_session.lc_thread == NULL);
2077 request->rq_session.lc_thread = thread;
2078 thread->t_env->le_ses = &request->rq_session;
2080 svc->srv_ops.so_req_handler(request);
2082 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
2085 if (unlikely(cfs_time_current_sec() > request->rq_deadline)) {
2086 DEBUG_REQ(D_WARNING, request, "Request took longer "
2087 "than estimated ("CFS_DURATION_T":"CFS_DURATION_T"s);"
2088 " client may timeout.",
2089 cfs_time_sub(request->rq_deadline,
2090 request->rq_arrival_time.tv_sec),
2091 cfs_time_sub(cfs_time_current_sec(),
2092 request->rq_deadline));
2095 do_gettimeofday(&work_end);
2096 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
2097 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
2098 "%s:%s+%d:%d:x"LPU64":%s:%d Request procesed in "
2099 "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
2101 (request->rq_export ?
2102 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2103 (request->rq_export ?
2104 atomic_read(&request->rq_export->exp_refcount) : -99),
2105 lustre_msg_get_status(request->rq_reqmsg),
2107 libcfs_id2str(request->rq_peer),
2108 lustre_msg_get_opc(request->rq_reqmsg),
2110 cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
2111 (request->rq_repmsg ?
2112 lustre_msg_get_transno(request->rq_repmsg) :
2113 request->rq_transno),
2115 (request->rq_repmsg ?
2116 lustre_msg_get_status(request->rq_repmsg) : -999));
2117 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2118 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2119 int opc = opcode_offset(op);
2120 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2121 LASSERT(opc < LUSTRE_MAX_OPCODES);
2122 lprocfs_counter_add(svc->srv_stats,
2123 opc + EXTRA_MAX_OPCODES,
2127 if (unlikely(request->rq_early_count)) {
2128 DEBUG_REQ(D_ADAPTTO, request,
2129 "sent %d early replies before finishing in "
2131 request->rq_early_count,
2132 cfs_time_sub(work_end.tv_sec,
2133 request->rq_arrival_time.tv_sec));
2136 ptlrpc_server_finish_active_request(svcpt, request);
2142 * An internal function to process a single reply state object.
2145 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2147 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2148 struct ptlrpc_service *svc = svcpt->scp_service;
2149 struct obd_export *exp;
2154 exp = rs->rs_export;
2156 LASSERT(rs->rs_difficult);
2157 LASSERT(rs->rs_scheduled);
2158 LASSERT(list_empty(&rs->rs_list));
2160 spin_lock(&exp->exp_lock);
2161 /* Noop if removed already */
2162 list_del_init(&rs->rs_exp_list);
2163 spin_unlock(&exp->exp_lock);
2165 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2166 * iterates over newly committed replies, removing them from
2167 * exp_uncommitted_replies. It then drops this lock and schedules the
2168 * replies it found for handling here.
2170 * We can avoid contention for exp_uncommitted_replies_lock between the
2171 * HRT threads and further commit callbacks by checking rs_committed
2172 * which is set in the commit callback while it holds both
2173 * rs_lock and exp_uncommitted_reples.
2175 * If we see rs_committed clear, the commit callback _may_ not have
2176 * handled this reply yet and we race with it to grab
2177 * exp_uncommitted_replies_lock before removing the reply from
2178 * exp_uncommitted_replies. Note that if we lose the race and the
2179 * reply has already been removed, list_del_init() is a noop.
2181 * If we see rs_committed set, we know the commit callback is handling,
2182 * or has handled this reply since store reordering might allow us to
2183 * see rs_committed set out of sequence. But since this is done
2184 * holding rs_lock, we can be sure it has all completed once we hold
2185 * rs_lock, which we do right next.
2187 if (!rs->rs_committed) {
2188 spin_lock(&exp->exp_uncommitted_replies_lock);
2189 list_del_init(&rs->rs_obd_list);
2190 spin_unlock(&exp->exp_uncommitted_replies_lock);
2193 spin_lock(&rs->rs_lock);
2195 been_handled = rs->rs_handled;
2198 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2199 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2201 if (nlocks == 0 && !been_handled) {
2202 /* If we see this, we should already have seen the warning
2203 * in mds_steal_ack_locks() */
2204 CDEBUG(D_HA, "All locks stolen from rs %p x"LPD64".t"LPD64
2207 rs->rs_xid, rs->rs_transno, rs->rs_opc,
2208 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2211 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2212 spin_unlock(&rs->rs_lock);
2214 if (!been_handled && rs->rs_on_net) {
2215 LNetMDUnlink(rs->rs_md_h);
2216 /* Ignore return code; we're racing with completion */
2219 while (nlocks-- > 0)
2220 ldlm_lock_decref(&rs->rs_locks[nlocks],
2221 rs->rs_modes[nlocks]);
2223 spin_lock(&rs->rs_lock);
2226 rs->rs_scheduled = 0;
2228 if (!rs->rs_on_net) {
2230 spin_unlock(&rs->rs_lock);
2232 class_export_put (exp);
2233 rs->rs_export = NULL;
2234 ptlrpc_rs_decref(rs);
2235 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2236 svc->srv_is_stopping)
2237 wake_up_all(&svcpt->scp_waitq);
2241 /* still on the net; callback will schedule */
2242 spin_unlock(&rs->rs_lock);
2248 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2250 int avail = svcpt->scp_nrqbds_posted;
2251 int low_water = test_req_buffer_pressure ? 0 :
2252 svcpt->scp_service->srv_nbuf_per_group / 2;
2254 /* NB I'm not locking; just looking. */
2256 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2257 * allowed the request history to grow out of control. We could put a
2258 * sanity check on that here and cull some history if we need the
2261 if (avail <= low_water)
2262 ptlrpc_grow_req_bufs(svcpt, 1);
2264 if (svcpt->scp_service->srv_stats) {
2265 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2266 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2271 ptlrpc_retry_rqbds(void *arg)
2273 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2275 svcpt->scp_rqbd_timeout = 0;
2280 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2282 return svcpt->scp_nreqs_active <
2283 svcpt->scp_nthrs_running - 1 -
2284 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2288 * allowed to create more threads
2289 * user can call it w/o any lock but need to hold
2290 * ptlrpc_service_part::scp_lock to get reliable result
2293 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2295 return svcpt->scp_nthrs_running +
2296 svcpt->scp_nthrs_starting <
2297 svcpt->scp_service->srv_nthrs_cpt_limit;
2301 * too many requests and allowed to create more threads
2304 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2306 return !ptlrpc_threads_enough(svcpt) &&
2307 ptlrpc_threads_increasable(svcpt);
2311 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2313 return thread_is_stopping(thread) ||
2314 thread->t_svcpt->scp_service->srv_is_stopping;
2318 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2320 return !list_empty(&svcpt->scp_rqbd_idle) &&
2321 svcpt->scp_rqbd_timeout == 0;
2325 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2327 return svcpt->scp_at_check;
2331 * requests wait on preprocessing
2332 * user can call it w/o any lock but need to hold
2333 * ptlrpc_service_part::scp_lock to get reliable result
2336 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2338 return !list_empty(&svcpt->scp_req_incoming);
2341 static __attribute__((__noinline__)) int
2342 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2343 struct ptlrpc_thread *thread)
2345 /* Don't exit while there are replies to be handled */
2346 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2347 ptlrpc_retry_rqbds, svcpt);
2349 lc_watchdog_disable(thread->t_watchdog);
2353 l_wait_event_exclusive_head(svcpt->scp_waitq,
2354 ptlrpc_thread_stopping(thread) ||
2355 ptlrpc_server_request_incoming(svcpt) ||
2356 ptlrpc_server_request_pending(svcpt, false) ||
2357 ptlrpc_rqbd_pending(svcpt) ||
2358 ptlrpc_at_check(svcpt), &lwi);
2360 if (ptlrpc_thread_stopping(thread))
2363 lc_watchdog_touch(thread->t_watchdog,
2364 ptlrpc_server_get_timeout(svcpt));
2369 * Main thread body for service threads.
2370 * Waits in a loop waiting for new requests to process to appear.
2371 * Every time an incoming requests is added to its queue, a waitq
2372 * is woken up and one of the threads will handle it.
2374 static int ptlrpc_main(void *arg)
2376 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2377 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2378 struct ptlrpc_service *svc = svcpt->scp_service;
2379 struct ptlrpc_reply_state *rs;
2380 struct group_info *ginfo = NULL;
2382 int counter = 0, rc = 0;
2385 thread->t_pid = current_pid();
2386 unshare_fs_struct();
2388 /* NB: we will call cfs_cpt_bind() for all threads, because we
2389 * might want to run lustre server only on a subset of system CPUs,
2390 * in that case ->scp_cpt is CFS_CPT_ANY */
2391 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2393 CWARN("%s: failed to bind %s on CPT %d\n",
2394 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2397 ginfo = groups_alloc(0);
2403 set_current_groups(ginfo);
2404 put_group_info(ginfo);
2406 if (svc->srv_ops.so_thr_init != NULL) {
2407 rc = svc->srv_ops.so_thr_init(thread);
2418 rc = lu_context_init(&env->le_ctx,
2419 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2423 thread->t_env = env;
2424 env->le_ctx.lc_thread = thread;
2425 env->le_ctx.lc_cookie = 0x6;
2427 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2428 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2432 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2433 svc->srv_name, svcpt->scp_cpt, rc);
2437 /* Alloc reply state structure for this one */
2438 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2444 spin_lock(&svcpt->scp_lock);
2446 LASSERT(thread_is_starting(thread));
2447 thread_clear_flags(thread, SVC_STARTING);
2449 LASSERT(svcpt->scp_nthrs_starting == 1);
2450 svcpt->scp_nthrs_starting--;
2452 /* SVC_STOPPING may already be set here if someone else is trying
2453 * to stop the service while this new thread has been dynamically
2454 * forked. We still set SVC_RUNNING to let our creator know that
2455 * we are now running, however we will exit as soon as possible */
2456 thread_add_flags(thread, SVC_RUNNING);
2457 svcpt->scp_nthrs_running++;
2458 spin_unlock(&svcpt->scp_lock);
2460 /* wake up our creator in case he's still waiting. */
2461 wake_up(&thread->t_ctl_waitq);
2463 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2466 spin_lock(&svcpt->scp_rep_lock);
2467 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2468 wake_up(&svcpt->scp_rep_waitq);
2469 spin_unlock(&svcpt->scp_rep_lock);
2471 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2472 svcpt->scp_nthrs_running);
2474 /* XXX maintain a list of all managed devices: insert here */
2475 while (!ptlrpc_thread_stopping(thread)) {
2476 if (ptlrpc_wait_event(svcpt, thread))
2479 ptlrpc_check_rqbd_pool(svcpt);
2481 if (ptlrpc_threads_need_create(svcpt)) {
2482 /* Ignore return code - we tried... */
2483 ptlrpc_start_thread(svcpt, 0);
2486 /* reset le_ses to initial state */
2488 /* Process all incoming reqs before handling any */
2489 if (ptlrpc_server_request_incoming(svcpt)) {
2490 lu_context_enter(&env->le_ctx);
2491 ptlrpc_server_handle_req_in(svcpt, thread);
2492 lu_context_exit(&env->le_ctx);
2494 /* but limit ourselves in case of flood */
2495 if (counter++ < 100)
2500 if (ptlrpc_at_check(svcpt))
2501 ptlrpc_at_check_timed(svcpt);
2503 if (ptlrpc_server_request_pending(svcpt, false)) {
2504 lu_context_enter(&env->le_ctx);
2505 ptlrpc_server_handle_request(svcpt, thread);
2506 lu_context_exit(&env->le_ctx);
2509 if (ptlrpc_rqbd_pending(svcpt) &&
2510 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2511 /* I just failed to repost request buffers.
2512 * Wait for a timeout (unless something else
2513 * happens) before I try again */
2514 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2515 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2516 svcpt->scp_nrqbds_posted);
2520 lc_watchdog_delete(thread->t_watchdog);
2521 thread->t_watchdog = NULL;
2525 * deconstruct service specific state created by ptlrpc_start_thread()
2527 if (svc->srv_ops.so_thr_done != NULL)
2528 svc->srv_ops.so_thr_done(thread);
2531 lu_context_fini(&env->le_ctx);
2535 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2536 thread, thread->t_pid, thread->t_id, rc);
2538 spin_lock(&svcpt->scp_lock);
2539 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2540 svcpt->scp_nthrs_starting--;
2542 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2543 /* must know immediately */
2544 svcpt->scp_nthrs_running--;
2548 thread_add_flags(thread, SVC_STOPPED);
2550 wake_up(&thread->t_ctl_waitq);
2551 spin_unlock(&svcpt->scp_lock);
2556 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2557 struct list_head *replies)
2561 spin_lock(&hrt->hrt_lock);
2563 list_splice_init(&hrt->hrt_queue, replies);
2564 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2566 spin_unlock(&hrt->hrt_lock);
2571 * Main body of "handle reply" function.
2572 * It processes acked reply states
2574 static int ptlrpc_hr_main(void *arg)
2576 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2577 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2578 struct list_head replies;
2579 char threadname[20];
2582 INIT_LIST_HEAD(&replies);
2583 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2584 hrp->hrp_cpt, hrt->hrt_id);
2585 unshare_fs_struct();
2587 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2589 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2590 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2593 atomic_inc(&hrp->hrp_nstarted);
2594 wake_up(&ptlrpc_hr.hr_waitq);
2596 while (!ptlrpc_hr.hr_stopping) {
2597 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2599 while (!list_empty(&replies)) {
2600 struct ptlrpc_reply_state *rs;
2602 rs = list_entry(replies.prev,
2603 struct ptlrpc_reply_state,
2605 list_del_init(&rs->rs_list);
2606 ptlrpc_handle_rs(rs);
2610 atomic_inc(&hrp->hrp_nstopped);
2611 wake_up(&ptlrpc_hr.hr_waitq);
2616 static void ptlrpc_stop_hr_threads(void)
2618 struct ptlrpc_hr_partition *hrp;
2622 ptlrpc_hr.hr_stopping = 1;
2624 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2625 if (hrp->hrp_thrs == NULL)
2626 continue; /* uninitialized */
2627 for (j = 0; j < hrp->hrp_nthrs; j++)
2628 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2631 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2632 if (hrp->hrp_thrs == NULL)
2633 continue; /* uninitialized */
2634 wait_event(ptlrpc_hr.hr_waitq,
2635 atomic_read(&hrp->hrp_nstopped) ==
2636 atomic_read(&hrp->hrp_nstarted));
2640 static int ptlrpc_start_hr_threads(void)
2642 struct ptlrpc_hr_partition *hrp;
2647 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2650 for (j = 0; j < hrp->hrp_nthrs; j++) {
2651 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2652 struct task_struct *task;
2654 task = kthread_run(ptlrpc_hr_main,
2656 "ptlrpc_hr%02d_%03d",
2665 wait_event(ptlrpc_hr.hr_waitq,
2666 atomic_read(&hrp->hrp_nstarted) == j);
2669 CERROR("cannot start reply handler thread %d:%d: "
2670 "rc = %d\n", i, j, rc);
2671 ptlrpc_stop_hr_threads();
2679 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2681 struct l_wait_info lwi = { 0 };
2682 struct ptlrpc_thread *thread;
2683 struct list_head zombie;
2687 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2688 svcpt->scp_service->srv_name);
2690 INIT_LIST_HEAD(&zombie);
2691 spin_lock(&svcpt->scp_lock);
2692 /* let the thread know that we would like it to stop asap */
2693 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2694 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2695 svcpt->scp_service->srv_thread_name, thread->t_id);
2696 thread_add_flags(thread, SVC_STOPPING);
2699 wake_up_all(&svcpt->scp_waitq);
2701 while (!list_empty(&svcpt->scp_threads)) {
2702 thread = list_entry(svcpt->scp_threads.next,
2703 struct ptlrpc_thread, t_link);
2704 if (thread_is_stopped(thread)) {
2705 list_del(&thread->t_link);
2706 list_add(&thread->t_link, &zombie);
2709 spin_unlock(&svcpt->scp_lock);
2711 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2712 svcpt->scp_service->srv_thread_name, thread->t_id);
2713 l_wait_event(thread->t_ctl_waitq,
2714 thread_is_stopped(thread), &lwi);
2716 spin_lock(&svcpt->scp_lock);
2719 spin_unlock(&svcpt->scp_lock);
2721 while (!list_empty(&zombie)) {
2722 thread = list_entry(zombie.next,
2723 struct ptlrpc_thread, t_link);
2724 list_del(&thread->t_link);
2725 OBD_FREE_PTR(thread);
2731 * Stops all threads of a particular service \a svc
2733 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2735 struct ptlrpc_service_part *svcpt;
2739 ptlrpc_service_for_each_part(svcpt, i, svc) {
2740 if (svcpt->scp_service != NULL)
2741 ptlrpc_svcpt_stop_threads(svcpt);
2746 EXPORT_SYMBOL(ptlrpc_stop_all_threads);
2748 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2755 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2756 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2758 for (i = 0; i < svc->srv_ncpts; i++) {
2759 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2760 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2766 /* We have enough threads, don't start more. b=15759 */
2773 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2774 svc->srv_thread_name, i, j, rc);
2775 ptlrpc_stop_all_threads(svc);
2778 EXPORT_SYMBOL(ptlrpc_start_threads);
2780 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2782 struct l_wait_info lwi = { 0 };
2783 struct ptlrpc_thread *thread;
2784 struct ptlrpc_service *svc;
2785 struct task_struct *task;
2789 LASSERT(svcpt != NULL);
2791 svc = svcpt->scp_service;
2793 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2794 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2795 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2798 if (unlikely(svc->srv_is_stopping))
2801 if (!ptlrpc_threads_increasable(svcpt) ||
2802 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2803 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2806 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
2809 init_waitqueue_head(&thread->t_ctl_waitq);
2811 spin_lock(&svcpt->scp_lock);
2812 if (!ptlrpc_threads_increasable(svcpt)) {
2813 spin_unlock(&svcpt->scp_lock);
2814 OBD_FREE_PTR(thread);
2818 if (svcpt->scp_nthrs_starting != 0) {
2819 /* serialize starting because some modules (obdfilter)
2820 * might require unique and contiguous t_id */
2821 LASSERT(svcpt->scp_nthrs_starting == 1);
2822 spin_unlock(&svcpt->scp_lock);
2823 OBD_FREE_PTR(thread);
2825 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2826 svc->srv_thread_name, svcpt->scp_thr_nextid);
2831 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2832 svc->srv_thread_name, svcpt->scp_thr_nextid);
2836 svcpt->scp_nthrs_starting++;
2837 thread->t_id = svcpt->scp_thr_nextid++;
2838 thread_add_flags(thread, SVC_STARTING);
2839 thread->t_svcpt = svcpt;
2841 list_add(&thread->t_link, &svcpt->scp_threads);
2842 spin_unlock(&svcpt->scp_lock);
2844 if (svcpt->scp_cpt >= 0) {
2845 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s%02d_%03d",
2846 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2848 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s_%04d",
2849 svc->srv_thread_name, thread->t_id);
2852 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2853 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
2856 CERROR("cannot start thread '%s': rc = %d\n",
2857 thread->t_name, rc);
2858 spin_lock(&svcpt->scp_lock);
2859 --svcpt->scp_nthrs_starting;
2860 if (thread_is_stopping(thread)) {
2861 /* this ptlrpc_thread is being hanled
2862 * by ptlrpc_svcpt_stop_threads now
2864 thread_add_flags(thread, SVC_STOPPED);
2865 wake_up(&thread->t_ctl_waitq);
2866 spin_unlock(&svcpt->scp_lock);
2868 list_del(&thread->t_link);
2869 spin_unlock(&svcpt->scp_lock);
2870 OBD_FREE_PTR(thread);
2878 l_wait_event(thread->t_ctl_waitq,
2879 thread_is_running(thread) || thread_is_stopped(thread),
2882 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2886 int ptlrpc_hr_init(void)
2888 struct ptlrpc_hr_partition *hrp;
2889 struct ptlrpc_hr_thread *hrt;
2895 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2896 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2898 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2900 if (ptlrpc_hr.hr_partitions == NULL)
2903 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2905 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2908 atomic_set(&hrp->hrp_nstarted, 0);
2909 atomic_set(&hrp->hrp_nstopped, 0);
2911 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
2912 hrp->hrp_nthrs /= cfs_cpu_ht_nsiblings(0);
2914 LASSERT(hrp->hrp_nthrs > 0);
2915 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, i,
2916 hrp->hrp_nthrs * sizeof(*hrt));
2917 if (hrp->hrp_thrs == NULL)
2918 GOTO(out, rc = -ENOMEM);
2920 for (j = 0; j < hrp->hrp_nthrs; j++) {
2921 hrt = &hrp->hrp_thrs[j];
2924 hrt->hrt_partition = hrp;
2925 init_waitqueue_head(&hrt->hrt_waitq);
2926 spin_lock_init(&hrt->hrt_lock);
2927 INIT_LIST_HEAD(&hrt->hrt_queue);
2931 rc = ptlrpc_start_hr_threads();
2938 void ptlrpc_hr_fini(void)
2940 struct ptlrpc_hr_partition *hrp;
2943 if (ptlrpc_hr.hr_partitions == NULL)
2946 ptlrpc_stop_hr_threads();
2948 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2949 if (hrp->hrp_thrs != NULL) {
2950 OBD_FREE(hrp->hrp_thrs,
2951 hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
2955 cfs_percpt_free(ptlrpc_hr.hr_partitions);
2956 ptlrpc_hr.hr_partitions = NULL;
2961 * Wait until all already scheduled replies are processed.
2963 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
2967 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2970 rc = l_wait_event(svcpt->scp_waitq,
2971 atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
2974 CWARN("Unexpectedly long timeout %s %p\n",
2975 svcpt->scp_service->srv_name, svcpt->scp_service);
2980 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
2982 struct ptlrpc_service_part *svcpt;
2985 /* early disarm AT timer... */
2986 ptlrpc_service_for_each_part(svcpt, i, svc) {
2987 if (svcpt->scp_service != NULL)
2988 cfs_timer_disarm(&svcpt->scp_at_timer);
2993 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
2995 struct ptlrpc_service_part *svcpt;
2996 struct ptlrpc_request_buffer_desc *rqbd;
2997 struct l_wait_info lwi;
3001 /* All history will be culled when the next request buffer is
3002 * freed in ptlrpc_service_purge_all() */
3003 svc->srv_hist_nrqbds_cpt_max = 0;
3005 rc = LNetClearLazyPortal(svc->srv_req_portal);
3008 ptlrpc_service_for_each_part(svcpt, i, svc) {
3009 if (svcpt->scp_service == NULL)
3012 /* Unlink all the request buffers. This forces a 'final'
3013 * event with its 'unlink' flag set for each posted rqbd */
3014 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
3016 rc = LNetMDUnlink(rqbd->rqbd_md_h);
3017 LASSERT(rc == 0 || rc == -ENOENT);
3021 ptlrpc_service_for_each_part(svcpt, i, svc) {
3022 if (svcpt->scp_service == NULL)
3025 /* Wait for the network to release any buffers
3026 * it's currently filling */
3027 spin_lock(&svcpt->scp_lock);
3028 while (svcpt->scp_nrqbds_posted != 0) {
3029 spin_unlock(&svcpt->scp_lock);
3030 /* Network access will complete in finite time but
3031 * the HUGE timeout lets us CWARN for visibility
3032 * of sluggish NALs */
3033 lwi = LWI_TIMEOUT_INTERVAL(
3034 cfs_time_seconds(LONG_UNLINK),
3035 cfs_time_seconds(1), NULL, NULL);
3036 rc = l_wait_event(svcpt->scp_waitq,
3037 svcpt->scp_nrqbds_posted == 0, &lwi);
3038 if (rc == -ETIMEDOUT) {
3039 CWARN("Service %s waiting for "
3040 "request buffers\n",
3041 svcpt->scp_service->srv_name);
3043 spin_lock(&svcpt->scp_lock);
3045 spin_unlock(&svcpt->scp_lock);
3050 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
3052 struct ptlrpc_service_part *svcpt;
3053 struct ptlrpc_request_buffer_desc *rqbd;
3054 struct ptlrpc_request *req;
3055 struct ptlrpc_reply_state *rs;
3058 ptlrpc_service_for_each_part(svcpt, i, svc) {
3059 if (svcpt->scp_service == NULL)
3062 spin_lock(&svcpt->scp_rep_lock);
3063 while (!list_empty(&svcpt->scp_rep_active)) {
3064 rs = list_entry(svcpt->scp_rep_active.next,
3065 struct ptlrpc_reply_state, rs_list);
3066 spin_lock(&rs->rs_lock);
3067 ptlrpc_schedule_difficult_reply(rs);
3068 spin_unlock(&rs->rs_lock);
3070 spin_unlock(&svcpt->scp_rep_lock);
3072 /* purge the request queue. NB No new replies (rqbds
3073 * all unlinked) and no service threads, so I'm the only
3074 * thread noodling the request queue now */
3075 while (!list_empty(&svcpt->scp_req_incoming)) {
3076 req = list_entry(svcpt->scp_req_incoming.next,
3077 struct ptlrpc_request, rq_list);
3079 list_del(&req->rq_list);
3080 svcpt->scp_nreqs_incoming--;
3081 ptlrpc_server_finish_request(svcpt, req);
3084 while (ptlrpc_server_request_pending(svcpt, true)) {
3085 req = ptlrpc_server_request_get(svcpt, true);
3086 ptlrpc_server_finish_active_request(svcpt, req);
3089 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
3090 LASSERT(svcpt->scp_nreqs_incoming == 0);
3091 LASSERT(svcpt->scp_nreqs_active == 0);
3092 /* history should have been culled by
3093 * ptlrpc_server_finish_request */
3094 LASSERT(svcpt->scp_hist_nrqbds == 0);
3096 /* Now free all the request buffers since nothing
3097 * references them any more... */
3099 while (!list_empty(&svcpt->scp_rqbd_idle)) {
3100 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
3101 struct ptlrpc_request_buffer_desc,
3103 ptlrpc_free_rqbd(rqbd);
3105 ptlrpc_wait_replies(svcpt);
3107 while (!list_empty(&svcpt->scp_rep_idle)) {
3108 rs = list_entry(svcpt->scp_rep_idle.next,
3109 struct ptlrpc_reply_state,
3111 list_del(&rs->rs_list);
3112 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
3118 ptlrpc_service_free(struct ptlrpc_service *svc)
3120 struct ptlrpc_service_part *svcpt;
3121 struct ptlrpc_at_array *array;
3124 ptlrpc_service_for_each_part(svcpt, i, svc) {
3125 if (svcpt->scp_service == NULL)
3128 /* In case somebody rearmed this in the meantime */
3129 cfs_timer_disarm(&svcpt->scp_at_timer);
3130 array = &svcpt->scp_at_array;
3132 if (array->paa_reqs_array != NULL) {
3133 OBD_FREE(array->paa_reqs_array,
3134 sizeof(struct list_head) * array->paa_size);
3135 array->paa_reqs_array = NULL;
3138 if (array->paa_reqs_count != NULL) {
3139 OBD_FREE(array->paa_reqs_count,
3140 sizeof(__u32) * array->paa_size);
3141 array->paa_reqs_count = NULL;
3145 ptlrpc_service_for_each_part(svcpt, i, svc)
3146 OBD_FREE_PTR(svcpt);
3148 if (svc->srv_cpts != NULL)
3149 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3151 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3152 srv_parts[svc->srv_ncpts]));
3155 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3159 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3161 service->srv_is_stopping = 1;
3163 mutex_lock(&ptlrpc_all_services_mutex);
3164 list_del_init(&service->srv_list);
3165 mutex_unlock(&ptlrpc_all_services_mutex);
3167 ptlrpc_service_del_atimer(service);
3168 ptlrpc_stop_all_threads(service);
3170 ptlrpc_service_unlink_rqbd(service);
3171 ptlrpc_service_purge_all(service);
3172 ptlrpc_service_nrs_cleanup(service);
3174 ptlrpc_lprocfs_unregister_service(service);
3176 ptlrpc_service_free(service);
3180 EXPORT_SYMBOL(ptlrpc_unregister_service);
3183 * Returns 0 if the service is healthy.
3185 * Right now, it just checks to make sure that requests aren't languishing
3186 * in the queue. We'll use this health check to govern whether a node needs
3187 * to be shot, so it's intentionally non-aggressive. */
3188 int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3190 struct ptlrpc_request *request = NULL;
3191 struct timeval right_now;
3194 do_gettimeofday(&right_now);
3196 spin_lock(&svcpt->scp_req_lock);
3197 /* How long has the next entry been waiting? */
3198 if (ptlrpc_server_high_pending(svcpt, true))
3199 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3200 else if (ptlrpc_server_normal_pending(svcpt, true))
3201 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3203 if (request == NULL) {
3204 spin_unlock(&svcpt->scp_req_lock);
3208 timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
3209 spin_unlock(&svcpt->scp_req_lock);
3211 if ((timediff / ONE_MILLION) >
3212 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3213 CERROR("%s: unhealthy - request has been waiting %lds\n",
3214 svcpt->scp_service->srv_name, timediff / ONE_MILLION);
3222 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3224 struct ptlrpc_service_part *svcpt;
3230 ptlrpc_service_for_each_part(svcpt, i, svc) {
3231 int rc = ptlrpc_svcpt_health_check(svcpt);
3238 EXPORT_SYMBOL(ptlrpc_service_health_check);