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, 2012, 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 <linux/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 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;
373 LASSERT(list_empty(&rs->rs_list));
375 hrt = ptlrpc_hr_select(rs->rs_svcpt);
377 spin_lock(&hrt->hrt_lock);
378 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
379 spin_unlock(&hrt->hrt_lock);
381 wake_up(&hrt->hrt_waitq);
385 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
387 LASSERT(spin_is_locked(&rs->rs_svcpt->scp_rep_lock));
388 LASSERT(spin_is_locked(&rs->rs_lock));
389 LASSERT (rs->rs_difficult);
390 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
392 if (rs->rs_scheduled) { /* being set up or already notified */
396 rs->rs_scheduled = 1;
397 list_del_init(&rs->rs_list);
398 ptlrpc_dispatch_difficult_reply(rs);
400 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
402 void ptlrpc_commit_replies(struct obd_export *exp)
404 struct ptlrpc_reply_state *rs, *nxt;
405 DECLARE_RS_BATCH(batch);
407 rs_batch_init(&batch);
408 /* Find any replies that have been committed and get their service
409 * to attend to complete them. */
411 /* CAVEAT EMPTOR: spinlock ordering!!! */
412 spin_lock(&exp->exp_uncommitted_replies_lock);
413 list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
415 LASSERT (rs->rs_difficult);
416 /* VBR: per-export last_committed */
417 LASSERT(rs->rs_export);
418 if (rs->rs_transno <= exp->exp_last_committed) {
419 list_del_init(&rs->rs_obd_list);
420 rs_batch_add(&batch, rs);
423 spin_unlock(&exp->exp_uncommitted_replies_lock);
424 rs_batch_fini(&batch);
426 EXPORT_SYMBOL(ptlrpc_commit_replies);
429 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
431 struct ptlrpc_request_buffer_desc *rqbd;
436 spin_lock(&svcpt->scp_lock);
438 if (list_empty(&svcpt->scp_rqbd_idle)) {
439 spin_unlock(&svcpt->scp_lock);
443 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
444 struct ptlrpc_request_buffer_desc,
446 list_del(&rqbd->rqbd_list);
448 /* assume we will post successfully */
449 svcpt->scp_nrqbds_posted++;
450 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
452 spin_unlock(&svcpt->scp_lock);
454 rc = ptlrpc_register_rqbd(rqbd);
461 spin_lock(&svcpt->scp_lock);
463 svcpt->scp_nrqbds_posted--;
464 list_del(&rqbd->rqbd_list);
465 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
467 /* Don't complain if no request buffers are posted right now; LNET
468 * won't drop requests because we set the portal lazy! */
470 spin_unlock(&svcpt->scp_lock);
475 static void ptlrpc_at_timer(unsigned long castmeharder)
477 struct ptlrpc_service_part *svcpt;
479 svcpt = (struct ptlrpc_service_part *)castmeharder;
481 svcpt->scp_at_check = 1;
482 svcpt->scp_at_checktime = cfs_time_current();
483 wake_up(&svcpt->scp_waitq);
487 ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
488 struct ptlrpc_service_conf *conf)
490 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
497 * Common code for estimating & validating threads number.
498 * CPT affinity service could have percpt thread-pool instead
499 * of a global thread-pool, which means user might not always
500 * get the threads number they give it in conf::tc_nthrs_user
501 * even they did set. It's because we need to validate threads
502 * number for each CPT to guarantee each pool will have enough
503 * threads to keep the service healthy.
505 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
506 init = max_t(int, init, tc->tc_nthrs_init);
508 /* NB: please see comments in lustre_lnet.h for definition
509 * details of these members */
510 LASSERT(tc->tc_nthrs_max != 0);
512 if (tc->tc_nthrs_user != 0) {
513 /* In case there is a reason to test a service with many
514 * threads, we give a less strict check here, it can
515 * be up to 8 * nthrs_max */
516 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
517 nthrs = total / svc->srv_ncpts;
518 init = max(init, nthrs);
522 total = tc->tc_nthrs_max;
523 if (tc->tc_nthrs_base == 0) {
524 /* don't care about base threads number per partition,
525 * this is most for non-affinity service */
526 nthrs = total / svc->srv_ncpts;
530 nthrs = tc->tc_nthrs_base;
531 if (svc->srv_ncpts == 1) {
534 /* NB: Increase the base number if it's single partition
535 * and total number of cores/HTs is larger or equal to 4.
536 * result will always < 2 * nthrs_base */
537 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
538 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
539 (tc->tc_nthrs_base >> i) != 0; i++)
540 nthrs += tc->tc_nthrs_base >> i;
543 if (tc->tc_thr_factor != 0) {
544 int factor = tc->tc_thr_factor;
549 * User wants to increase number of threads with for
550 * each CPU core/HT, most likely the factor is larger then
551 * one thread/core because service threads are supposed to
552 * be blocked by lock or wait for IO.
555 * Amdahl's law says that adding processors wouldn't give
556 * a linear increasing of parallelism, so it's nonsense to
557 * have too many threads no matter how many cores/HTs
560 cpumask_copy(&mask, topology_thread_cpumask(0));
561 if (cpus_weight(mask) > 1) { /* weight is # of HTs */
562 /* depress thread factor for hyper-thread */
563 factor = factor - (factor >> 1) + (factor >> 3);
566 weight = cfs_cpt_weight(svc->srv_cptable, 0);
569 for (; factor > 0 && weight > 0; factor--, weight -= fade)
570 nthrs += min(weight, fade) * factor;
573 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
574 nthrs = max(tc->tc_nthrs_base,
575 tc->tc_nthrs_max / svc->srv_ncpts);
578 nthrs = max(nthrs, tc->tc_nthrs_init);
579 svc->srv_nthrs_cpt_limit = nthrs;
580 svc->srv_nthrs_cpt_init = init;
582 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
583 CDEBUG(D_OTHER, "%s: This service may have more threads (%d) "
584 "than the given soft limit (%d)\n",
585 svc->srv_name, nthrs * svc->srv_ncpts,
591 * Initialize percpt data for a service
594 ptlrpc_service_part_init(struct ptlrpc_service *svc,
595 struct ptlrpc_service_part *svcpt, int cpt)
597 struct ptlrpc_at_array *array;
602 svcpt->scp_cpt = cpt;
603 INIT_LIST_HEAD(&svcpt->scp_threads);
605 /* rqbd and incoming request queue */
606 spin_lock_init(&svcpt->scp_lock);
607 INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
608 INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
609 INIT_LIST_HEAD(&svcpt->scp_req_incoming);
610 init_waitqueue_head(&svcpt->scp_waitq);
611 /* history request & rqbd list */
612 INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
613 INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
615 /* acitve requests and hp requests */
616 spin_lock_init(&svcpt->scp_req_lock);
619 spin_lock_init(&svcpt->scp_rep_lock);
620 INIT_LIST_HEAD(&svcpt->scp_rep_active);
621 INIT_LIST_HEAD(&svcpt->scp_rep_idle);
622 init_waitqueue_head(&svcpt->scp_rep_waitq);
623 atomic_set(&svcpt->scp_nreps_difficult, 0);
625 /* adaptive timeout */
626 spin_lock_init(&svcpt->scp_at_lock);
627 array = &svcpt->scp_at_array;
629 size = at_est2timeout(at_max);
630 array->paa_size = size;
631 array->paa_count = 0;
632 array->paa_deadline = -1;
634 /* allocate memory for scp_at_array (ptlrpc_at_array) */
635 OBD_CPT_ALLOC(array->paa_reqs_array,
636 svc->srv_cptable, cpt, sizeof(struct list_head) * size);
637 if (array->paa_reqs_array == NULL)
640 for (index = 0; index < size; index++)
641 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
643 OBD_CPT_ALLOC(array->paa_reqs_count,
644 svc->srv_cptable, cpt, sizeof(__u32) * size);
645 if (array->paa_reqs_count == NULL)
648 cfs_timer_init(&svcpt->scp_at_timer, ptlrpc_at_timer, svcpt);
649 /* At SOW, service time should be quick; 10s seems generous. If client
650 * timeout is less than this, we'll be sending an early reply. */
651 at_init(&svcpt->scp_at_estimate, 10, 0);
653 /* assign this before call ptlrpc_grow_req_bufs */
654 svcpt->scp_service = svc;
655 /* Now allocate the request buffers, but don't post them now */
656 rc = ptlrpc_grow_req_bufs(svcpt, 0);
657 /* We shouldn't be under memory pressure at startup, so
658 * fail if we can't allocate all our buffers at this time. */
665 if (array->paa_reqs_count != NULL) {
666 OBD_FREE(array->paa_reqs_count, sizeof(__u32) * size);
667 array->paa_reqs_count = NULL;
670 if (array->paa_reqs_array != NULL) {
671 OBD_FREE(array->paa_reqs_array,
672 sizeof(struct list_head) * array->paa_size);
673 array->paa_reqs_array = NULL;
680 * Initialize service on a given portal.
681 * This includes starting serving threads , allocating and posting rqbds and
684 struct ptlrpc_service *
685 ptlrpc_register_service(struct ptlrpc_service_conf *conf,
686 struct proc_dir_entry *proc_entry)
688 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
689 struct ptlrpc_service *service;
690 struct ptlrpc_service_part *svcpt;
691 struct cfs_cpt_table *cptable;
698 LASSERT(conf->psc_buf.bc_nbufs > 0);
699 LASSERT(conf->psc_buf.bc_buf_size >=
700 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
701 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
703 cptable = cconf->cc_cptable;
705 cptable = cfs_cpt_table;
707 if (!conf->psc_thr.tc_cpu_affinity) {
710 ncpts = cfs_cpt_number(cptable);
711 if (cconf->cc_pattern != NULL) {
712 struct cfs_expr_list *el;
714 rc = cfs_expr_list_parse(cconf->cc_pattern,
715 strlen(cconf->cc_pattern),
718 CERROR("%s: invalid CPT pattern string: %s",
719 conf->psc_name, cconf->cc_pattern);
720 return ERR_PTR(-EINVAL);
723 rc = cfs_expr_list_values(el, ncpts, &cpts);
724 cfs_expr_list_free(el);
726 CERROR("%s: failed to parse CPT array %s: %d\n",
727 conf->psc_name, cconf->cc_pattern, rc);
729 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
730 return ERR_PTR(rc < 0 ? rc : -EINVAL);
736 OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
737 if (service == NULL) {
739 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
740 return ERR_PTR(-ENOMEM);
743 service->srv_cptable = cptable;
744 service->srv_cpts = cpts;
745 service->srv_ncpts = ncpts;
747 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
748 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
749 service->srv_cpt_bits++;
752 spin_lock_init(&service->srv_lock);
753 service->srv_name = conf->psc_name;
754 service->srv_watchdog_factor = conf->psc_watchdog_factor;
755 INIT_LIST_HEAD(&service->srv_list); /* for safty of cleanup */
757 /* buffer configuration */
758 service->srv_nbuf_per_group = test_req_buffer_pressure ?
759 1 : conf->psc_buf.bc_nbufs;
760 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
762 service->srv_buf_size = conf->psc_buf.bc_buf_size;
763 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
764 service->srv_req_portal = conf->psc_buf.bc_req_portal;
766 /* Increase max reply size to next power of two */
767 service->srv_max_reply_size = 1;
768 while (service->srv_max_reply_size <
769 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
770 service->srv_max_reply_size <<= 1;
772 service->srv_thread_name = conf->psc_thr.tc_thr_name;
773 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
774 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
775 service->srv_ops = conf->psc_ops;
777 for (i = 0; i < ncpts; i++) {
778 if (!conf->psc_thr.tc_cpu_affinity)
781 cpt = cpts != NULL ? cpts[i] : i;
783 OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
785 GOTO(failed, rc = -ENOMEM);
787 service->srv_parts[i] = svcpt;
788 rc = ptlrpc_service_part_init(service, svcpt, cpt);
793 ptlrpc_server_nthreads_check(service, conf);
795 rc = LNetSetLazyPortal(service->srv_req_portal);
798 mutex_lock(&ptlrpc_all_services_mutex);
799 list_add (&service->srv_list, &ptlrpc_all_services);
800 mutex_unlock(&ptlrpc_all_services_mutex);
802 if (proc_entry != NULL)
803 ptlrpc_lprocfs_register_service(proc_entry, service);
805 rc = ptlrpc_service_nrs_setup(service);
809 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
810 service->srv_name, service->srv_req_portal);
812 rc = ptlrpc_start_threads(service);
814 CERROR("Failed to start threads for service %s: %d\n",
815 service->srv_name, rc);
821 ptlrpc_unregister_service(service);
824 EXPORT_SYMBOL(ptlrpc_register_service);
827 * to actually free the request, must be called without holding svc_lock.
828 * note it's caller's responsibility to unlink req->rq_list.
830 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
832 LASSERT(atomic_read(&req->rq_refcount) == 0);
833 LASSERT(list_empty(&req->rq_timed_list));
835 /* DEBUG_REQ() assumes the reply state of a request with a valid
836 * ref will not be destroyed until that reference is dropped. */
837 ptlrpc_req_drop_rs(req);
839 sptlrpc_svc_ctx_decref(req);
841 if (req != &req->rq_rqbd->rqbd_req) {
842 /* NB request buffers use an embedded
843 * req if the incoming req unlinked the
844 * MD; this isn't one of them! */
845 OBD_FREE(req, sizeof(*req));
850 * drop a reference count of the request. if it reaches 0, we either
851 * put it into history list, or free it immediately.
853 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
855 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
856 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
857 struct ptlrpc_service *svc = svcpt->scp_service;
859 struct list_head *tmp;
860 struct list_head *nxt;
862 if (!atomic_dec_and_test(&req->rq_refcount))
865 if (req->rq_at_linked) {
866 spin_lock(&svcpt->scp_at_lock);
867 /* recheck with lock, in case it's unlinked by
868 * ptlrpc_at_check_timed() */
869 if (likely(req->rq_at_linked))
870 ptlrpc_at_remove_timed(req);
871 spin_unlock(&svcpt->scp_at_lock);
874 LASSERT(list_empty(&req->rq_timed_list));
876 /* finalize request */
877 if (req->rq_export) {
878 class_export_put(req->rq_export);
879 req->rq_export = NULL;
882 spin_lock(&svcpt->scp_lock);
884 list_add(&req->rq_list, &rqbd->rqbd_reqs);
886 refcount = --(rqbd->rqbd_refcount);
888 /* request buffer is now idle: add to history */
889 list_del(&rqbd->rqbd_list);
891 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
892 svcpt->scp_hist_nrqbds++;
894 /* cull some history?
895 * I expect only about 1 or 2 rqbds need to be recycled here */
896 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
897 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
898 struct ptlrpc_request_buffer_desc,
901 list_del(&rqbd->rqbd_list);
902 svcpt->scp_hist_nrqbds--;
904 /* remove rqbd's reqs from svc's req history while
905 * I've got the service lock */
906 list_for_each(tmp, &rqbd->rqbd_reqs) {
907 req = list_entry(tmp, struct ptlrpc_request,
909 /* Track the highest culled req seq */
910 if (req->rq_history_seq >
911 svcpt->scp_hist_seq_culled) {
912 svcpt->scp_hist_seq_culled =
915 list_del(&req->rq_history_list);
918 spin_unlock(&svcpt->scp_lock);
920 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
921 req = list_entry(rqbd->rqbd_reqs.next,
922 struct ptlrpc_request,
924 list_del(&req->rq_list);
925 ptlrpc_server_free_request(req);
928 spin_lock(&svcpt->scp_lock);
930 * now all reqs including the embedded req has been
931 * disposed, schedule request buffer for re-use.
933 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) ==
935 list_add_tail(&rqbd->rqbd_list,
936 &svcpt->scp_rqbd_idle);
939 spin_unlock(&svcpt->scp_lock);
940 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
941 /* If we are low on memory, we are not interested in history */
942 list_del(&req->rq_list);
943 list_del_init(&req->rq_history_list);
945 /* Track the highest culled req seq */
946 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
947 svcpt->scp_hist_seq_culled = req->rq_history_seq;
949 spin_unlock(&svcpt->scp_lock);
951 ptlrpc_server_free_request(req);
953 spin_unlock(&svcpt->scp_lock);
957 /** Change request export and move hp request from old export to new */
958 void ptlrpc_request_change_export(struct ptlrpc_request *req,
959 struct obd_export *export)
961 if (req->rq_export != NULL) {
962 if (!list_empty(&req->rq_exp_list)) {
963 /* remove rq_exp_list from last export */
964 spin_lock_bh(&req->rq_export->exp_rpc_lock);
965 list_del_init(&req->rq_exp_list);
966 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
968 /* export has one reference already, so it`s safe to
969 * add req to export queue here and get another
970 * reference for request later */
971 spin_lock_bh(&export->exp_rpc_lock);
972 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
973 spin_unlock_bh(&export->exp_rpc_lock);
975 class_export_rpc_dec(req->rq_export);
976 class_export_put(req->rq_export);
979 /* request takes one export refcount */
980 req->rq_export = class_export_get(export);
981 class_export_rpc_inc(export);
987 * to finish a request: stop sending more early replies, and release
990 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
991 struct ptlrpc_request *req)
993 ptlrpc_server_hpreq_fini(req);
995 ptlrpc_server_drop_request(req);
999 * to finish a active request: stop sending more early replies, and release
1000 * the request. should be called after we finished handling the request.
1002 static void ptlrpc_server_finish_active_request(
1003 struct ptlrpc_service_part *svcpt,
1004 struct ptlrpc_request *req)
1006 spin_lock(&svcpt->scp_req_lock);
1007 ptlrpc_nrs_req_stop_nolock(req);
1008 svcpt->scp_nreqs_active--;
1010 svcpt->scp_nhreqs_active--;
1011 spin_unlock(&svcpt->scp_req_lock);
1013 ptlrpc_nrs_req_finalize(req);
1015 if (req->rq_export != NULL)
1016 class_export_rpc_dec(req->rq_export);
1018 ptlrpc_server_finish_request(svcpt, req);
1022 * This function makes sure dead exports are evicted in a timely manner.
1023 * This function is only called when some export receives a message (i.e.,
1024 * the network is up.)
1026 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
1028 struct obd_export *oldest_exp;
1029 time_t oldest_time, new_time;
1033 /* Compensate for slow machines, etc, by faking our request time
1034 into the future. Although this can break the strict time-ordering
1035 of the list, we can be really lazy here - we don't have to evict
1036 at the exact right moment. Eventually, all silent exports
1037 will make it to the top of the list. */
1039 /* Do not pay attention on 1sec or smaller renewals. */
1040 new_time = cfs_time_current_sec() + extra_delay;
1041 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1044 exp->exp_last_request_time = new_time;
1045 CDEBUG(D_HA, "updating export %s at "CFS_TIME_T" exp %p\n",
1046 exp->exp_client_uuid.uuid,
1047 exp->exp_last_request_time, exp);
1049 /* exports may get disconnected from the chain even though the
1050 export has references, so we must keep the spin lock while
1051 manipulating the lists */
1052 spin_lock(&exp->exp_obd->obd_dev_lock);
1054 if (list_empty(&exp->exp_obd_chain_timed)) {
1055 /* this one is not timed */
1056 spin_unlock(&exp->exp_obd->obd_dev_lock);
1060 list_move_tail(&exp->exp_obd_chain_timed,
1061 &exp->exp_obd->obd_exports_timed);
1063 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1064 struct obd_export, exp_obd_chain_timed);
1065 oldest_time = oldest_exp->exp_last_request_time;
1066 spin_unlock(&exp->exp_obd->obd_dev_lock);
1068 if (exp->exp_obd->obd_recovering) {
1069 /* be nice to everyone during recovery */
1073 /* Note - racing to start/reset the obd_eviction timer is safe */
1074 if (exp->exp_obd->obd_eviction_timer == 0) {
1075 /* Check if the oldest entry is expired. */
1076 if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
1078 /* We need a second timer, in case the net was down and
1079 * it just came back. Since the pinger may skip every
1080 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1081 * we better wait for 3. */
1082 exp->exp_obd->obd_eviction_timer =
1083 cfs_time_current_sec() + 3 * PING_INTERVAL;
1084 CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
1085 exp->exp_obd->obd_name,
1086 obd_export_nid2str(oldest_exp), oldest_time);
1089 if (cfs_time_current_sec() >
1090 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1091 /* The evictor won't evict anyone who we've heard from
1092 * recently, so we don't have to check before we start
1094 if (!ping_evictor_wake(exp))
1095 exp->exp_obd->obd_eviction_timer = 0;
1101 * Sanity check request \a req.
1102 * Return 0 if all is ok, error code otherwise.
1104 static int ptlrpc_check_req(struct ptlrpc_request *req)
1108 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1109 req->rq_export->exp_conn_cnt)) {
1110 DEBUG_REQ(D_RPCTRACE, req,
1111 "DROPPING req from old connection %d < %d",
1112 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1113 req->rq_export->exp_conn_cnt);
1116 if (unlikely(req->rq_export->exp_obd &&
1117 req->rq_export->exp_obd->obd_fail)) {
1118 /* Failing over, don't handle any more reqs, send
1119 error response instead. */
1120 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1121 req, req->rq_export->exp_obd->obd_name);
1123 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1124 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1125 !(req->rq_export->exp_obd->obd_recovering)) {
1126 DEBUG_REQ(D_ERROR, req,
1127 "Invalid replay without recovery");
1128 class_fail_export(req->rq_export);
1130 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1131 !(req->rq_export->exp_obd->obd_recovering)) {
1132 DEBUG_REQ(D_ERROR, req, "Invalid req with transno "
1133 LPU64" without recovery",
1134 lustre_msg_get_transno(req->rq_reqmsg));
1135 class_fail_export(req->rq_export);
1139 if (unlikely(rc < 0)) {
1140 req->rq_status = rc;
1146 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1148 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1151 if (array->paa_count == 0) {
1152 cfs_timer_disarm(&svcpt->scp_at_timer);
1156 /* Set timer for closest deadline */
1157 next = (__s32)(array->paa_deadline - cfs_time_current_sec() -
1160 ptlrpc_at_timer((unsigned long)svcpt);
1162 cfs_timer_arm(&svcpt->scp_at_timer, cfs_time_shift(next));
1163 CDEBUG(D_INFO, "armed %s at %+ds\n",
1164 svcpt->scp_service->srv_name, next);
1168 /* Add rpc to early reply check list */
1169 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1171 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1172 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1173 struct ptlrpc_request *rq = NULL;
1179 if (req->rq_no_reply)
1182 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1185 spin_lock(&svcpt->scp_at_lock);
1186 LASSERT(list_empty(&req->rq_timed_list));
1188 index = (unsigned long)req->rq_deadline % array->paa_size;
1189 if (array->paa_reqs_count[index] > 0) {
1190 /* latest rpcs will have the latest deadlines in the list,
1191 * so search backward. */
1192 list_for_each_entry_reverse(rq,
1193 &array->paa_reqs_array[index],
1195 if (req->rq_deadline >= rq->rq_deadline) {
1196 list_add(&req->rq_timed_list,
1197 &rq->rq_timed_list);
1203 /* Add the request at the head of the list */
1204 if (list_empty(&req->rq_timed_list))
1205 list_add(&req->rq_timed_list,
1206 &array->paa_reqs_array[index]);
1208 spin_lock(&req->rq_lock);
1209 req->rq_at_linked = 1;
1210 spin_unlock(&req->rq_lock);
1211 req->rq_at_index = index;
1212 array->paa_reqs_count[index]++;
1214 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1215 array->paa_deadline = req->rq_deadline;
1216 ptlrpc_at_set_timer(svcpt);
1218 spin_unlock(&svcpt->scp_at_lock);
1224 ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1226 struct ptlrpc_at_array *array;
1228 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1230 /* NB: must call with hold svcpt::scp_at_lock */
1231 LASSERT(!list_empty(&req->rq_timed_list));
1232 list_del_init(&req->rq_timed_list);
1234 spin_lock(&req->rq_lock);
1235 req->rq_at_linked = 0;
1236 spin_unlock(&req->rq_lock);
1238 array->paa_reqs_count[req->rq_at_index]--;
1242 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1244 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1245 struct ptlrpc_request *reqcopy;
1246 struct lustre_msg *reqmsg;
1247 cfs_duration_t olddl = req->rq_deadline - cfs_time_current_sec();
1251 /* deadline is when the client expects us to reply, margin is the
1252 difference between clients' and servers' expectations */
1253 DEBUG_REQ(D_ADAPTTO, req,
1254 "%ssending early reply (deadline %+lds, margin %+lds) for "
1255 "%d+%d", AT_OFF ? "AT off - not " : "",
1256 olddl, olddl - at_get(&svcpt->scp_at_estimate),
1257 at_get(&svcpt->scp_at_estimate), at_extra);
1263 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), "
1264 "not sending early reply. Consider increasing "
1265 "at_early_margin (%d)?", olddl, at_early_margin);
1267 /* Return an error so we're not re-added to the timed list. */
1271 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
1272 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
1273 "but no AT support");
1277 if (req->rq_export &&
1278 lustre_msg_get_flags(req->rq_reqmsg) &
1279 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1280 /* During recovery, we don't want to send too many early
1281 * replies, but on the other hand we want to make sure the
1282 * client has enough time to resend if the rpc is lost. So
1283 * during the recovery period send at least 4 early replies,
1284 * spacing them every at_extra if we can. at_estimate should
1285 * always equal this fixed value during recovery. */
1286 at_measured(&svcpt->scp_at_estimate, min(at_extra,
1287 req->rq_export->exp_obd->obd_recovery_timeout / 4));
1289 /* Fake our processing time into the future to ask the clients
1290 * for some extra amount of time */
1291 at_measured(&svcpt->scp_at_estimate, at_extra +
1292 cfs_time_current_sec() -
1293 req->rq_arrival_time.tv_sec);
1295 /* Check to see if we've actually increased the deadline -
1296 * we may be past adaptive_max */
1297 if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
1298 at_get(&svcpt->scp_at_estimate)) {
1299 DEBUG_REQ(D_WARNING, req, "Couldn't add any time "
1300 "(%ld/%ld), not sending early reply\n",
1301 olddl, req->rq_arrival_time.tv_sec +
1302 at_get(&svcpt->scp_at_estimate) -
1303 cfs_time_current_sec());
1307 newdl = cfs_time_current_sec() + at_get(&svcpt->scp_at_estimate);
1309 OBD_ALLOC(reqcopy, sizeof(*reqcopy));
1310 if (reqcopy == NULL)
1312 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1314 OBD_FREE(reqcopy, sizeof(*reqcopy));
1319 reqcopy->rq_reply_state = NULL;
1320 reqcopy->rq_rep_swab_mask = 0;
1321 reqcopy->rq_pack_bulk = 0;
1322 reqcopy->rq_pack_udesc = 0;
1323 reqcopy->rq_packed_final = 0;
1324 sptlrpc_svc_ctx_addref(reqcopy);
1325 /* We only need the reqmsg for the magic */
1326 reqcopy->rq_reqmsg = reqmsg;
1327 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1329 LASSERT(atomic_read(&req->rq_refcount));
1330 /** if it is last refcount then early reply isn't needed */
1331 if (atomic_read(&req->rq_refcount) == 1) {
1332 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1333 "abort sending early reply\n");
1334 GOTO(out, rc = -EINVAL);
1337 /* Connection ref */
1338 reqcopy->rq_export = class_conn2export(
1339 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1340 if (reqcopy->rq_export == NULL)
1341 GOTO(out, rc = -ENODEV);
1344 class_export_rpc_inc(reqcopy->rq_export);
1345 if (reqcopy->rq_export->exp_obd &&
1346 reqcopy->rq_export->exp_obd->obd_fail)
1347 GOTO(out_put, rc = -ENODEV);
1349 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1353 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1356 /* Adjust our own deadline to what we told the client */
1357 req->rq_deadline = newdl;
1358 req->rq_early_count++; /* number sent, server side */
1360 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1363 /* Free the (early) reply state from lustre_pack_reply.
1364 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1365 ptlrpc_req_drop_rs(reqcopy);
1368 class_export_rpc_dec(reqcopy->rq_export);
1369 class_export_put(reqcopy->rq_export);
1371 sptlrpc_svc_ctx_decref(reqcopy);
1372 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1373 OBD_FREE(reqcopy, sizeof(*reqcopy));
1377 /* Send early replies to everybody expiring within at_early_margin
1378 asking for at_extra time */
1379 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1381 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1382 struct ptlrpc_request *rq, *n;
1383 struct list_head work_list;
1386 time_t now = cfs_time_current_sec();
1387 cfs_duration_t delay;
1388 int first, counter = 0;
1390 spin_lock(&svcpt->scp_at_lock);
1391 if (svcpt->scp_at_check == 0) {
1392 spin_unlock(&svcpt->scp_at_lock);
1395 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1396 svcpt->scp_at_check = 0;
1398 if (array->paa_count == 0) {
1399 spin_unlock(&svcpt->scp_at_lock);
1403 /* The timer went off, but maybe the nearest rpc already completed. */
1404 first = array->paa_deadline - now;
1405 if (first > at_early_margin) {
1406 /* We've still got plenty of time. Reset the timer. */
1407 ptlrpc_at_set_timer(svcpt);
1408 spin_unlock(&svcpt->scp_at_lock);
1412 /* We're close to a timeout, and we don't know how much longer the
1413 server will take. Send early replies to everyone expiring soon. */
1414 INIT_LIST_HEAD(&work_list);
1416 index = (unsigned long)array->paa_deadline % array->paa_size;
1417 count = array->paa_count;
1419 count -= array->paa_reqs_count[index];
1420 list_for_each_entry_safe(rq, n,
1421 &array->paa_reqs_array[index],
1423 if (rq->rq_deadline > now + at_early_margin) {
1424 /* update the earliest deadline */
1425 if (deadline == -1 ||
1426 rq->rq_deadline < deadline)
1427 deadline = rq->rq_deadline;
1431 ptlrpc_at_remove_timed(rq);
1433 * ptlrpc_server_drop_request() may drop
1434 * refcount to 0 already. Let's check this and
1435 * don't add entry to work_list
1437 if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
1438 list_add(&rq->rq_timed_list, &work_list);
1442 if (++index >= array->paa_size)
1445 array->paa_deadline = deadline;
1446 /* we have a new earliest deadline, restart the timer */
1447 ptlrpc_at_set_timer(svcpt);
1449 spin_unlock(&svcpt->scp_at_lock);
1451 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1452 "replies\n", first, at_extra, counter);
1454 /* We're already past request deadlines before we even get a
1455 chance to send early replies */
1456 LCONSOLE_WARN("%s: This server is not able to keep up with "
1457 "request traffic (cpu-bound).\n",
1458 svcpt->scp_service->srv_name);
1459 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
1460 "delay="CFS_DURATION_T"(jiff)\n",
1461 counter, svcpt->scp_nreqs_incoming,
1462 svcpt->scp_nreqs_active,
1463 at_get(&svcpt->scp_at_estimate), delay);
1466 /* we took additional refcount so entries can't be deleted from list, no
1467 * locking is needed */
1468 while (!list_empty(&work_list)) {
1469 rq = list_entry(work_list.next, struct ptlrpc_request,
1471 list_del_init(&rq->rq_timed_list);
1473 if (ptlrpc_at_send_early_reply(rq) == 0)
1474 ptlrpc_at_add_timed(rq);
1476 ptlrpc_server_drop_request(rq);
1479 return 1; /* return "did_something" for liblustre */
1483 * Put the request to the export list if the request may become
1484 * a high priority one.
1486 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1487 struct ptlrpc_request *req)
1491 if (svcpt->scp_service->srv_ops.so_hpreq_handler) {
1492 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1497 if (req->rq_export && req->rq_ops) {
1498 /* Perform request specific check. We should do this check
1499 * before the request is added into exp_hp_rpcs list otherwise
1500 * it may hit swab race at LU-1044. */
1501 if (req->rq_ops->hpreq_check) {
1502 rc = req->rq_ops->hpreq_check(req);
1504 * XXX: Out of all current
1505 * ptlrpc_hpreq_ops::hpreq_check(), only
1506 * ldlm_cancel_hpreq_check() can return an error code;
1507 * other functions assert in similar places, which seems
1508 * odd. What also does not seem right is that handlers
1509 * for those RPCs do not assert on the same checks, but
1510 * rather handle the error cases. e.g. see
1511 * ost_rw_hpreq_check(), and ost_brw_read(),
1516 LASSERT(rc == 0 || rc == 1);
1519 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1520 list_add(&req->rq_exp_list,
1521 &req->rq_export->exp_hp_rpcs);
1522 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1525 ptlrpc_nrs_req_initialize(svcpt, req, rc);
1530 /** Remove the request from the export list. */
1531 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1533 if (req->rq_export && req->rq_ops) {
1534 /* refresh lock timeout again so that client has more
1535 * room to send lock cancel RPC. */
1536 if (req->rq_ops->hpreq_fini)
1537 req->rq_ops->hpreq_fini(req);
1539 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1540 list_del_init(&req->rq_exp_list);
1541 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1545 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1550 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1551 .hpreq_check = ptlrpc_hpreq_check,
1554 /* Hi-Priority RPC check by RPC operation code. */
1555 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1557 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1559 /* Check for export to let only reconnects for not yet evicted
1560 * export to become a HP rpc. */
1561 if ((req->rq_export != NULL) &&
1562 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1563 req->rq_ops = &ptlrpc_hpreq_common;
1567 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1569 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1570 struct ptlrpc_request *req)
1574 rc = ptlrpc_server_hpreq_init(svcpt, req);
1578 ptlrpc_nrs_req_add(svcpt, req, !!rc);
1584 * Allow to handle high priority request
1585 * User can call it w/o any lock but need to hold
1586 * ptlrpc_service_part::scp_req_lock to get reliable result
1588 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1591 int running = svcpt->scp_nthrs_running;
1593 if (!nrs_svcpt_has_hp(svcpt))
1599 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1600 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1601 /* leave just 1 thread for normal RPCs */
1602 running = PTLRPC_NTHRS_INIT;
1603 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1607 if (svcpt->scp_nreqs_active >= running - 1)
1610 if (svcpt->scp_nhreqs_active == 0)
1613 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1614 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1617 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1620 return ptlrpc_server_allow_high(svcpt, force) &&
1621 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1625 * Only allow normal priority requests on a service that has a high-priority
1626 * queue if forced (i.e. cleanup), if there are other high priority requests
1627 * already being processed (i.e. those threads can service more high-priority
1628 * requests), or if there are enough idle threads that a later thread can do
1629 * a high priority request.
1630 * User can call it w/o any lock but need to hold
1631 * ptlrpc_service_part::scp_req_lock to get reliable result
1633 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1636 int running = svcpt->scp_nthrs_running;
1637 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1638 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1639 /* leave just 1 thread for normal RPCs */
1640 running = PTLRPC_NTHRS_INIT;
1641 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1646 svcpt->scp_nreqs_active < running - 2)
1649 if (svcpt->scp_nreqs_active >= running - 1)
1652 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1655 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1658 return ptlrpc_server_allow_normal(svcpt, force) &&
1659 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1663 * Returns true if there are requests available in incoming
1664 * request queue for processing and it is allowed to fetch them.
1665 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1666 * to get reliable result
1667 * \see ptlrpc_server_allow_normal
1668 * \see ptlrpc_server_allow high
1671 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1673 return ptlrpc_server_high_pending(svcpt, force) ||
1674 ptlrpc_server_normal_pending(svcpt, force);
1678 * Fetch a request for processing from queue of unprocessed requests.
1679 * Favors high-priority requests.
1680 * Returns a pointer to fetched request.
1682 static struct ptlrpc_request *
1683 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1685 struct ptlrpc_request *req = NULL;
1687 spin_lock(&svcpt->scp_req_lock);
1689 if (ptlrpc_server_high_pending(svcpt, force)) {
1690 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1692 svcpt->scp_hreq_count++;
1697 if (ptlrpc_server_normal_pending(svcpt, force)) {
1698 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1700 svcpt->scp_hreq_count = 0;
1705 spin_unlock(&svcpt->scp_req_lock);
1709 svcpt->scp_nreqs_active++;
1711 svcpt->scp_nhreqs_active++;
1713 spin_unlock(&svcpt->scp_req_lock);
1715 if (likely(req->rq_export))
1716 class_export_rpc_inc(req->rq_export);
1722 * Handle freshly incoming reqs, add to timed early reply list,
1723 * pass on to regular request queue.
1724 * All incoming requests pass through here before getting into
1725 * ptlrpc_server_handle_req later on.
1728 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1729 struct ptlrpc_thread *thread)
1731 struct ptlrpc_service *svc = svcpt->scp_service;
1732 struct ptlrpc_request *req;
1736 spin_lock(&svcpt->scp_lock);
1737 if (list_empty(&svcpt->scp_req_incoming)) {
1738 spin_unlock(&svcpt->scp_lock);
1742 req = list_entry(svcpt->scp_req_incoming.next,
1743 struct ptlrpc_request, rq_list);
1744 list_del_init(&req->rq_list);
1745 svcpt->scp_nreqs_incoming--;
1746 /* Consider this still a "queued" request as far as stats are
1748 spin_unlock(&svcpt->scp_lock);
1750 /* go through security check/transform */
1751 rc = sptlrpc_svc_unwrap_request(req);
1755 case SECSVC_COMPLETE:
1756 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1765 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1766 * redo it wouldn't be harmful.
1768 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1769 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1771 CERROR("error unpacking request: ptl %d from %s "
1772 "x"LPU64"\n", svc->srv_req_portal,
1773 libcfs_id2str(req->rq_peer), req->rq_xid);
1778 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1780 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1781 LPU64"\n", svc->srv_req_portal,
1782 libcfs_id2str(req->rq_peer), req->rq_xid);
1786 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1787 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1788 CERROR("drop incoming rpc opc %u, x"LPU64"\n",
1789 cfs_fail_val, req->rq_xid);
1794 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1795 CERROR("wrong packet type received (type=%u) from %s\n",
1796 lustre_msg_get_type(req->rq_reqmsg),
1797 libcfs_id2str(req->rq_peer));
1801 switch(lustre_msg_get_opc(req->rq_reqmsg)) {
1804 req->rq_bulk_write = 1;
1808 case MGS_CONFIG_READ:
1809 req->rq_bulk_read = 1;
1813 CDEBUG(D_RPCTRACE, "got req x"LPU64"\n", req->rq_xid);
1815 req->rq_export = class_conn2export(
1816 lustre_msg_get_handle(req->rq_reqmsg));
1817 if (req->rq_export) {
1818 rc = ptlrpc_check_req(req);
1820 rc = sptlrpc_target_export_check(req->rq_export, req);
1822 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1823 "illegal security flavor,");
1828 ptlrpc_update_export_timer(req->rq_export, 0);
1831 /* req_in handling should/must be fast */
1832 if (cfs_time_current_sec() - req->rq_arrival_time.tv_sec > 5)
1833 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1834 cfs_time_sub(cfs_time_current_sec(),
1835 req->rq_arrival_time.tv_sec));
1837 /* Set rpc server deadline and add it to the timed list */
1838 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1839 MSGHDR_AT_SUPPORT) ?
1840 /* The max time the client expects us to take */
1841 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1842 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1843 if (unlikely(deadline == 0)) {
1844 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1848 req->rq_svc_thread = thread;
1850 ptlrpc_at_add_timed(req);
1852 /* Move it over to the request processing queue */
1853 rc = ptlrpc_server_request_add(svcpt, req);
1857 wake_up(&svcpt->scp_waitq);
1861 ptlrpc_server_finish_request(svcpt, req);
1867 * Main incoming request handling logic.
1868 * Calls handler function from service to do actual processing.
1871 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
1872 struct ptlrpc_thread *thread)
1874 struct ptlrpc_service *svc = svcpt->scp_service;
1875 struct ptlrpc_request *request;
1876 struct timeval work_start;
1877 struct timeval work_end;
1882 request = ptlrpc_server_request_get(svcpt, false);
1883 if (request == NULL)
1886 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1887 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1888 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1889 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1891 if (unlikely(fail_opc)) {
1892 if (request->rq_export && request->rq_ops)
1893 OBD_FAIL_TIMEOUT(fail_opc, 4);
1896 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1898 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1899 libcfs_debug_dumplog();
1901 do_gettimeofday(&work_start);
1902 timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
1903 if (likely(svc->srv_stats != NULL)) {
1904 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1906 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1907 svcpt->scp_nreqs_incoming);
1908 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1909 svcpt->scp_nreqs_active);
1910 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1911 at_get(&svcpt->scp_at_estimate));
1914 rc = lu_context_init(&request->rq_session, LCT_SESSION | LCT_NOREF);
1916 CERROR("Failure to initialize session: %d\n", rc);
1919 request->rq_session.lc_thread = thread;
1920 request->rq_session.lc_cookie = 0x5;
1921 lu_context_enter(&request->rq_session);
1923 CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
1925 request->rq_svc_thread = thread;
1927 request->rq_svc_thread->t_env->le_ses = &request->rq_session;
1929 if (likely(request->rq_export)) {
1930 if (unlikely(ptlrpc_check_req(request)))
1932 ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
1935 /* Discard requests queued for longer than the deadline.
1936 The deadline is increased if we send an early reply. */
1937 if (cfs_time_current_sec() > request->rq_deadline) {
1938 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s"
1939 ": deadline "CFS_DURATION_T":"CFS_DURATION_T"s ago\n",
1940 libcfs_id2str(request->rq_peer),
1941 cfs_time_sub(request->rq_deadline,
1942 request->rq_arrival_time.tv_sec),
1943 cfs_time_sub(cfs_time_current_sec(),
1944 request->rq_deadline));
1948 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
1949 "%s:%s+%d:%d:x"LPU64":%s:%d\n", current_comm(),
1950 (request->rq_export ?
1951 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1952 (request->rq_export ?
1953 atomic_read(&request->rq_export->exp_refcount) : -99),
1954 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1955 libcfs_id2str(request->rq_peer),
1956 lustre_msg_get_opc(request->rq_reqmsg));
1958 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1959 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
1961 rc = svc->srv_ops.so_req_handler(request);
1963 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1966 lu_context_exit(&request->rq_session);
1967 lu_context_fini(&request->rq_session);
1969 if (unlikely(cfs_time_current_sec() > request->rq_deadline)) {
1970 DEBUG_REQ(D_WARNING, request, "Request took longer "
1971 "than estimated ("CFS_DURATION_T":"CFS_DURATION_T"s);"
1972 " client may timeout.",
1973 cfs_time_sub(request->rq_deadline,
1974 request->rq_arrival_time.tv_sec),
1975 cfs_time_sub(cfs_time_current_sec(),
1976 request->rq_deadline));
1979 do_gettimeofday(&work_end);
1980 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
1981 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
1982 "%s:%s+%d:%d:x"LPU64":%s:%d Request procesed in "
1983 "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
1985 (request->rq_export ?
1986 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1987 (request->rq_export ?
1988 atomic_read(&request->rq_export->exp_refcount) : -99),
1989 lustre_msg_get_status(request->rq_reqmsg),
1991 libcfs_id2str(request->rq_peer),
1992 lustre_msg_get_opc(request->rq_reqmsg),
1994 cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
1995 (request->rq_repmsg ?
1996 lustre_msg_get_transno(request->rq_repmsg) :
1997 request->rq_transno),
1999 (request->rq_repmsg ?
2000 lustre_msg_get_status(request->rq_repmsg) : -999));
2001 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2002 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2003 int opc = opcode_offset(op);
2004 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2005 LASSERT(opc < LUSTRE_MAX_OPCODES);
2006 lprocfs_counter_add(svc->srv_stats,
2007 opc + EXTRA_MAX_OPCODES,
2011 if (unlikely(request->rq_early_count)) {
2012 DEBUG_REQ(D_ADAPTTO, request,
2013 "sent %d early replies before finishing in "
2015 request->rq_early_count,
2016 cfs_time_sub(work_end.tv_sec,
2017 request->rq_arrival_time.tv_sec));
2021 ptlrpc_server_finish_active_request(svcpt, request);
2027 * An internal function to process a single reply state object.
2030 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2032 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2033 struct ptlrpc_service *svc = svcpt->scp_service;
2034 struct obd_export *exp;
2038 exp = rs->rs_export;
2040 LASSERT (rs->rs_difficult);
2041 LASSERT (rs->rs_scheduled);
2042 LASSERT (list_empty(&rs->rs_list));
2044 spin_lock(&exp->exp_lock);
2045 /* Noop if removed already */
2046 list_del_init (&rs->rs_exp_list);
2047 spin_unlock(&exp->exp_lock);
2049 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2050 * iterates over newly committed replies, removing them from
2051 * exp_uncommitted_replies. It then drops this lock and schedules the
2052 * replies it found for handling here.
2054 * We can avoid contention for exp_uncommitted_replies_lock between the
2055 * HRT threads and further commit callbacks by checking rs_committed
2056 * which is set in the commit callback while it holds both
2057 * rs_lock and exp_uncommitted_reples.
2059 * If we see rs_committed clear, the commit callback _may_ not have
2060 * handled this reply yet and we race with it to grab
2061 * exp_uncommitted_replies_lock before removing the reply from
2062 * exp_uncommitted_replies. Note that if we lose the race and the
2063 * reply has already been removed, list_del_init() is a noop.
2065 * If we see rs_committed set, we know the commit callback is handling,
2066 * or has handled this reply since store reordering might allow us to
2067 * see rs_committed set out of sequence. But since this is done
2068 * holding rs_lock, we can be sure it has all completed once we hold
2069 * rs_lock, which we do right next.
2071 if (!rs->rs_committed) {
2072 spin_lock(&exp->exp_uncommitted_replies_lock);
2073 list_del_init(&rs->rs_obd_list);
2074 spin_unlock(&exp->exp_uncommitted_replies_lock);
2077 spin_lock(&rs->rs_lock);
2079 been_handled = rs->rs_handled;
2082 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2083 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2085 if (nlocks == 0 && !been_handled) {
2086 /* If we see this, we should already have seen the warning
2087 * in mds_steal_ack_locks() */
2088 CDEBUG(D_HA, "All locks stolen from rs %p x"LPD64".t"LPD64
2091 rs->rs_xid, rs->rs_transno, rs->rs_opc,
2092 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2095 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2096 spin_unlock(&rs->rs_lock);
2098 if (!been_handled && rs->rs_on_net) {
2099 LNetMDUnlink(rs->rs_md_h);
2100 /* Ignore return code; we're racing with completion */
2103 while (nlocks-- > 0)
2104 ldlm_lock_decref(&rs->rs_locks[nlocks],
2105 rs->rs_modes[nlocks]);
2107 spin_lock(&rs->rs_lock);
2110 rs->rs_scheduled = 0;
2112 if (!rs->rs_on_net) {
2114 spin_unlock(&rs->rs_lock);
2116 class_export_put (exp);
2117 rs->rs_export = NULL;
2118 ptlrpc_rs_decref (rs);
2119 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2120 svc->srv_is_stopping)
2121 wake_up_all(&svcpt->scp_waitq);
2125 /* still on the net; callback will schedule */
2126 spin_unlock(&rs->rs_lock);
2132 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2134 int avail = svcpt->scp_nrqbds_posted;
2135 int low_water = test_req_buffer_pressure ? 0 :
2136 svcpt->scp_service->srv_nbuf_per_group / 2;
2138 /* NB I'm not locking; just looking. */
2140 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2141 * allowed the request history to grow out of control. We could put a
2142 * sanity check on that here and cull some history if we need the
2145 if (avail <= low_water)
2146 ptlrpc_grow_req_bufs(svcpt, 1);
2148 if (svcpt->scp_service->srv_stats) {
2149 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2150 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2155 ptlrpc_retry_rqbds(void *arg)
2157 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2159 svcpt->scp_rqbd_timeout = 0;
2164 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2166 return svcpt->scp_nreqs_active <
2167 svcpt->scp_nthrs_running - 1 -
2168 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2172 * allowed to create more threads
2173 * user can call it w/o any lock but need to hold
2174 * ptlrpc_service_part::scp_lock to get reliable result
2177 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2179 return svcpt->scp_nthrs_running +
2180 svcpt->scp_nthrs_starting <
2181 svcpt->scp_service->srv_nthrs_cpt_limit;
2185 * too many requests and allowed to create more threads
2188 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2190 return !ptlrpc_threads_enough(svcpt) &&
2191 ptlrpc_threads_increasable(svcpt);
2195 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2197 return thread_is_stopping(thread) ||
2198 thread->t_svcpt->scp_service->srv_is_stopping;
2202 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2204 return !list_empty(&svcpt->scp_rqbd_idle) &&
2205 svcpt->scp_rqbd_timeout == 0;
2209 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2211 return svcpt->scp_at_check;
2215 * requests wait on preprocessing
2216 * user can call it w/o any lock but need to hold
2217 * ptlrpc_service_part::scp_lock to get reliable result
2220 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2222 return !list_empty(&svcpt->scp_req_incoming);
2225 static __attribute__((__noinline__)) int
2226 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2227 struct ptlrpc_thread *thread)
2229 /* Don't exit while there are replies to be handled */
2230 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2231 ptlrpc_retry_rqbds, svcpt);
2233 /* XXX: Add this back when libcfs watchdog is merged upstream
2234 lc_watchdog_disable(thread->t_watchdog);
2239 l_wait_event_exclusive_head(svcpt->scp_waitq,
2240 ptlrpc_thread_stopping(thread) ||
2241 ptlrpc_server_request_incoming(svcpt) ||
2242 ptlrpc_server_request_pending(svcpt, false) ||
2243 ptlrpc_rqbd_pending(svcpt) ||
2244 ptlrpc_at_check(svcpt), &lwi);
2246 if (ptlrpc_thread_stopping(thread))
2250 lc_watchdog_touch(thread->t_watchdog,
2251 ptlrpc_server_get_timeout(svcpt));
2257 * Main thread body for service threads.
2258 * Waits in a loop waiting for new requests to process to appear.
2259 * Every time an incoming requests is added to its queue, a waitq
2260 * is woken up and one of the threads will handle it.
2262 static int ptlrpc_main(void *arg)
2264 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2265 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2266 struct ptlrpc_service *svc = svcpt->scp_service;
2267 struct ptlrpc_reply_state *rs;
2268 #ifdef WITH_GROUP_INFO
2269 struct group_info *ginfo = NULL;
2272 int counter = 0, rc = 0;
2274 thread->t_pid = current_pid();
2275 unshare_fs_struct();
2277 /* NB: we will call cfs_cpt_bind() for all threads, because we
2278 * might want to run lustre server only on a subset of system CPUs,
2279 * in that case ->scp_cpt is CFS_CPT_ANY */
2280 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2282 CWARN("%s: failed to bind %s on CPT %d\n",
2283 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2286 #ifdef WITH_GROUP_INFO
2287 ginfo = groups_alloc(0);
2293 set_current_groups(ginfo);
2294 put_group_info(ginfo);
2297 if (svc->srv_ops.so_thr_init != NULL) {
2298 rc = svc->srv_ops.so_thr_init(thread);
2309 rc = lu_context_init(&env->le_ctx,
2310 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2314 thread->t_env = env;
2315 env->le_ctx.lc_thread = thread;
2316 env->le_ctx.lc_cookie = 0x6;
2318 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2319 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2323 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2324 svc->srv_name, svcpt->scp_cpt, rc);
2328 /* Alloc reply state structure for this one */
2329 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2335 spin_lock(&svcpt->scp_lock);
2337 LASSERT(thread_is_starting(thread));
2338 thread_clear_flags(thread, SVC_STARTING);
2340 LASSERT(svcpt->scp_nthrs_starting == 1);
2341 svcpt->scp_nthrs_starting--;
2343 /* SVC_STOPPING may already be set here if someone else is trying
2344 * to stop the service while this new thread has been dynamically
2345 * forked. We still set SVC_RUNNING to let our creator know that
2346 * we are now running, however we will exit as soon as possible */
2347 thread_add_flags(thread, SVC_RUNNING);
2348 svcpt->scp_nthrs_running++;
2349 spin_unlock(&svcpt->scp_lock);
2351 /* wake up our creator in case he's still waiting. */
2352 wake_up(&thread->t_ctl_waitq);
2355 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2359 spin_lock(&svcpt->scp_rep_lock);
2360 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2361 wake_up(&svcpt->scp_rep_waitq);
2362 spin_unlock(&svcpt->scp_rep_lock);
2364 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2365 svcpt->scp_nthrs_running);
2367 /* XXX maintain a list of all managed devices: insert here */
2368 while (!ptlrpc_thread_stopping(thread)) {
2369 if (ptlrpc_wait_event(svcpt, thread))
2372 ptlrpc_check_rqbd_pool(svcpt);
2374 if (ptlrpc_threads_need_create(svcpt)) {
2375 /* Ignore return code - we tried... */
2376 ptlrpc_start_thread(svcpt, 0);
2379 /* Process all incoming reqs before handling any */
2380 if (ptlrpc_server_request_incoming(svcpt)) {
2381 lu_context_enter(&env->le_ctx);
2383 ptlrpc_server_handle_req_in(svcpt, thread);
2384 lu_context_exit(&env->le_ctx);
2386 /* but limit ourselves in case of flood */
2387 if (counter++ < 100)
2392 if (ptlrpc_at_check(svcpt))
2393 ptlrpc_at_check_timed(svcpt);
2395 if (ptlrpc_server_request_pending(svcpt, false)) {
2396 lu_context_enter(&env->le_ctx);
2397 ptlrpc_server_handle_request(svcpt, thread);
2398 lu_context_exit(&env->le_ctx);
2401 if (ptlrpc_rqbd_pending(svcpt) &&
2402 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2403 /* I just failed to repost request buffers.
2404 * Wait for a timeout (unless something else
2405 * happens) before I try again */
2406 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2407 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2408 svcpt->scp_nrqbds_posted);
2413 lc_watchdog_delete(thread->t_watchdog);
2414 thread->t_watchdog = NULL;
2419 * deconstruct service specific state created by ptlrpc_start_thread()
2421 if (svc->srv_ops.so_thr_done != NULL)
2422 svc->srv_ops.so_thr_done(thread);
2425 lu_context_fini(&env->le_ctx);
2429 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2430 thread, thread->t_pid, thread->t_id, rc);
2432 spin_lock(&svcpt->scp_lock);
2433 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2434 svcpt->scp_nthrs_starting--;
2436 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2437 /* must know immediately */
2438 svcpt->scp_nthrs_running--;
2442 thread_add_flags(thread, SVC_STOPPED);
2444 wake_up(&thread->t_ctl_waitq);
2445 spin_unlock(&svcpt->scp_lock);
2450 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2451 struct list_head *replies)
2455 spin_lock(&hrt->hrt_lock);
2457 list_splice_init(&hrt->hrt_queue, replies);
2458 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2460 spin_unlock(&hrt->hrt_lock);
2465 * Main body of "handle reply" function.
2466 * It processes acked reply states
2468 static int ptlrpc_hr_main(void *arg)
2470 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2471 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2472 LIST_HEAD (replies);
2473 char threadname[20];
2476 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2477 hrp->hrp_cpt, hrt->hrt_id);
2478 unshare_fs_struct();
2480 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2482 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2483 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2486 atomic_inc(&hrp->hrp_nstarted);
2487 wake_up(&ptlrpc_hr.hr_waitq);
2489 while (!ptlrpc_hr.hr_stopping) {
2490 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2492 while (!list_empty(&replies)) {
2493 struct ptlrpc_reply_state *rs;
2495 rs = list_entry(replies.prev,
2496 struct ptlrpc_reply_state,
2498 list_del_init(&rs->rs_list);
2499 ptlrpc_handle_rs(rs);
2503 atomic_inc(&hrp->hrp_nstopped);
2504 wake_up(&ptlrpc_hr.hr_waitq);
2509 static void ptlrpc_stop_hr_threads(void)
2511 struct ptlrpc_hr_partition *hrp;
2515 ptlrpc_hr.hr_stopping = 1;
2517 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2518 if (hrp->hrp_thrs == NULL)
2519 continue; /* uninitialized */
2520 for (j = 0; j < hrp->hrp_nthrs; j++)
2521 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2524 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2525 if (hrp->hrp_thrs == NULL)
2526 continue; /* uninitialized */
2527 wait_event(ptlrpc_hr.hr_waitq,
2528 atomic_read(&hrp->hrp_nstopped) ==
2529 atomic_read(&hrp->hrp_nstarted));
2533 static int ptlrpc_start_hr_threads(void)
2535 struct ptlrpc_hr_partition *hrp;
2539 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2542 for (j = 0; j < hrp->hrp_nthrs; j++) {
2543 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2544 rc = PTR_ERR(kthread_run(ptlrpc_hr_main,
2546 "ptlrpc_hr%02d_%03d",
2549 if (IS_ERR_VALUE(rc))
2552 wait_event(ptlrpc_hr.hr_waitq,
2553 atomic_read(&hrp->hrp_nstarted) == j);
2554 if (!IS_ERR_VALUE(rc))
2557 CERROR("Reply handling thread %d:%d Failed on starting: "
2558 "rc = %d\n", i, j, rc);
2559 ptlrpc_stop_hr_threads();
2565 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2567 struct l_wait_info lwi = { 0 };
2568 struct ptlrpc_thread *thread;
2571 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2572 svcpt->scp_service->srv_name);
2574 spin_lock(&svcpt->scp_lock);
2575 /* let the thread know that we would like it to stop asap */
2576 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2577 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2578 svcpt->scp_service->srv_thread_name, thread->t_id);
2579 thread_add_flags(thread, SVC_STOPPING);
2582 wake_up_all(&svcpt->scp_waitq);
2584 while (!list_empty(&svcpt->scp_threads)) {
2585 thread = list_entry(svcpt->scp_threads.next,
2586 struct ptlrpc_thread, t_link);
2587 if (thread_is_stopped(thread)) {
2588 list_del(&thread->t_link);
2589 list_add(&thread->t_link, &zombie);
2592 spin_unlock(&svcpt->scp_lock);
2594 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2595 svcpt->scp_service->srv_thread_name, thread->t_id);
2596 l_wait_event(thread->t_ctl_waitq,
2597 thread_is_stopped(thread), &lwi);
2599 spin_lock(&svcpt->scp_lock);
2602 spin_unlock(&svcpt->scp_lock);
2604 while (!list_empty(&zombie)) {
2605 thread = list_entry(zombie.next,
2606 struct ptlrpc_thread, t_link);
2607 list_del(&thread->t_link);
2608 OBD_FREE_PTR(thread);
2613 * Stops all threads of a particular service \a svc
2615 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2617 struct ptlrpc_service_part *svcpt;
2620 ptlrpc_service_for_each_part(svcpt, i, svc) {
2621 if (svcpt->scp_service != NULL)
2622 ptlrpc_svcpt_stop_threads(svcpt);
2625 EXPORT_SYMBOL(ptlrpc_stop_all_threads);
2627 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2633 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2634 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2636 for (i = 0; i < svc->srv_ncpts; i++) {
2637 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2638 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2644 /* We have enough threads, don't start more. b=15759 */
2651 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2652 svc->srv_thread_name, i, j, rc);
2653 ptlrpc_stop_all_threads(svc);
2656 EXPORT_SYMBOL(ptlrpc_start_threads);
2658 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2660 struct l_wait_info lwi = { 0 };
2661 struct ptlrpc_thread *thread;
2662 struct ptlrpc_service *svc;
2665 LASSERT(svcpt != NULL);
2667 svc = svcpt->scp_service;
2669 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2670 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2671 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2674 if (unlikely(svc->srv_is_stopping))
2677 if (!ptlrpc_threads_increasable(svcpt) ||
2678 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2679 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2682 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
2685 init_waitqueue_head(&thread->t_ctl_waitq);
2687 spin_lock(&svcpt->scp_lock);
2688 if (!ptlrpc_threads_increasable(svcpt)) {
2689 spin_unlock(&svcpt->scp_lock);
2690 OBD_FREE_PTR(thread);
2694 if (svcpt->scp_nthrs_starting != 0) {
2695 /* serialize starting because some modules (obdfilter)
2696 * might require unique and contiguous t_id */
2697 LASSERT(svcpt->scp_nthrs_starting == 1);
2698 spin_unlock(&svcpt->scp_lock);
2699 OBD_FREE_PTR(thread);
2701 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2702 svc->srv_thread_name, svcpt->scp_thr_nextid);
2707 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2708 svc->srv_thread_name, svcpt->scp_thr_nextid);
2712 svcpt->scp_nthrs_starting++;
2713 thread->t_id = svcpt->scp_thr_nextid++;
2714 thread_add_flags(thread, SVC_STARTING);
2715 thread->t_svcpt = svcpt;
2717 list_add(&thread->t_link, &svcpt->scp_threads);
2718 spin_unlock(&svcpt->scp_lock);
2720 if (svcpt->scp_cpt >= 0) {
2721 snprintf(thread->t_name, sizeof(thread->t_name), "%s%02d_%03d",
2722 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2724 snprintf(thread->t_name, sizeof(thread->t_name), "%s_%04d",
2725 svc->srv_thread_name, thread->t_id);
2728 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2729 rc = PTR_ERR(kthread_run(ptlrpc_main, thread, "%s", thread->t_name));
2730 if (IS_ERR_VALUE(rc)) {
2731 CERROR("cannot start thread '%s': rc %d\n",
2732 thread->t_name, rc);
2733 spin_lock(&svcpt->scp_lock);
2734 --svcpt->scp_nthrs_starting;
2735 if (thread_is_stopping(thread)) {
2736 /* this ptlrpc_thread is being hanled
2737 * by ptlrpc_svcpt_stop_threads now
2739 thread_add_flags(thread, SVC_STOPPED);
2740 wake_up(&thread->t_ctl_waitq);
2741 spin_unlock(&svcpt->scp_lock);
2743 list_del(&thread->t_link);
2744 spin_unlock(&svcpt->scp_lock);
2745 OBD_FREE_PTR(thread);
2753 l_wait_event(thread->t_ctl_waitq,
2754 thread_is_running(thread) || thread_is_stopped(thread),
2757 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2761 int ptlrpc_hr_init(void)
2764 struct ptlrpc_hr_partition *hrp;
2765 struct ptlrpc_hr_thread *hrt;
2771 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2772 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2774 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2776 if (ptlrpc_hr.hr_partitions == NULL)
2779 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2781 cpumask_copy(&mask, topology_thread_cpumask(0));
2782 weight = cpus_weight(mask);
2784 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2787 atomic_set(&hrp->hrp_nstarted, 0);
2788 atomic_set(&hrp->hrp_nstopped, 0);
2790 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
2791 hrp->hrp_nthrs /= weight;
2793 LASSERT(hrp->hrp_nthrs > 0);
2794 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, i,
2795 hrp->hrp_nthrs * sizeof(*hrt));
2796 if (hrp->hrp_thrs == NULL)
2797 GOTO(out, rc = -ENOMEM);
2799 for (j = 0; j < hrp->hrp_nthrs; j++) {
2800 hrt = &hrp->hrp_thrs[j];
2803 hrt->hrt_partition = hrp;
2804 init_waitqueue_head(&hrt->hrt_waitq);
2805 spin_lock_init(&hrt->hrt_lock);
2806 INIT_LIST_HEAD(&hrt->hrt_queue);
2810 rc = ptlrpc_start_hr_threads();
2817 void ptlrpc_hr_fini(void)
2819 struct ptlrpc_hr_partition *hrp;
2822 if (ptlrpc_hr.hr_partitions == NULL)
2825 ptlrpc_stop_hr_threads();
2827 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2828 if (hrp->hrp_thrs != NULL) {
2829 OBD_FREE(hrp->hrp_thrs,
2830 hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
2834 cfs_percpt_free(ptlrpc_hr.hr_partitions);
2835 ptlrpc_hr.hr_partitions = NULL;
2840 * Wait until all already scheduled replies are processed.
2842 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
2846 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2849 rc = l_wait_event(svcpt->scp_waitq,
2850 atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
2853 CWARN("Unexpectedly long timeout %s %p\n",
2854 svcpt->scp_service->srv_name, svcpt->scp_service);
2859 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
2861 struct ptlrpc_service_part *svcpt;
2864 /* early disarm AT timer... */
2865 ptlrpc_service_for_each_part(svcpt, i, svc) {
2866 if (svcpt->scp_service != NULL)
2867 cfs_timer_disarm(&svcpt->scp_at_timer);
2872 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
2874 struct ptlrpc_service_part *svcpt;
2875 struct ptlrpc_request_buffer_desc *rqbd;
2876 struct l_wait_info lwi;
2880 /* All history will be culled when the next request buffer is
2881 * freed in ptlrpc_service_purge_all() */
2882 svc->srv_hist_nrqbds_cpt_max = 0;
2884 rc = LNetClearLazyPortal(svc->srv_req_portal);
2887 ptlrpc_service_for_each_part(svcpt, i, svc) {
2888 if (svcpt->scp_service == NULL)
2891 /* Unlink all the request buffers. This forces a 'final'
2892 * event with its 'unlink' flag set for each posted rqbd */
2893 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
2895 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2896 LASSERT(rc == 0 || rc == -ENOENT);
2900 ptlrpc_service_for_each_part(svcpt, i, svc) {
2901 if (svcpt->scp_service == NULL)
2904 /* Wait for the network to release any buffers
2905 * it's currently filling */
2906 spin_lock(&svcpt->scp_lock);
2907 while (svcpt->scp_nrqbds_posted != 0) {
2908 spin_unlock(&svcpt->scp_lock);
2909 /* Network access will complete in finite time but
2910 * the HUGE timeout lets us CWARN for visibility
2911 * of sluggish NALs */
2912 lwi = LWI_TIMEOUT_INTERVAL(
2913 cfs_time_seconds(LONG_UNLINK),
2914 cfs_time_seconds(1), NULL, NULL);
2915 rc = l_wait_event(svcpt->scp_waitq,
2916 svcpt->scp_nrqbds_posted == 0, &lwi);
2917 if (rc == -ETIMEDOUT) {
2918 CWARN("Service %s waiting for "
2919 "request buffers\n",
2920 svcpt->scp_service->srv_name);
2922 spin_lock(&svcpt->scp_lock);
2924 spin_unlock(&svcpt->scp_lock);
2929 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
2931 struct ptlrpc_service_part *svcpt;
2932 struct ptlrpc_request_buffer_desc *rqbd;
2933 struct ptlrpc_request *req;
2934 struct ptlrpc_reply_state *rs;
2937 ptlrpc_service_for_each_part(svcpt, i, svc) {
2938 if (svcpt->scp_service == NULL)
2941 spin_lock(&svcpt->scp_rep_lock);
2942 while (!list_empty(&svcpt->scp_rep_active)) {
2943 rs = list_entry(svcpt->scp_rep_active.next,
2944 struct ptlrpc_reply_state, rs_list);
2945 spin_lock(&rs->rs_lock);
2946 ptlrpc_schedule_difficult_reply(rs);
2947 spin_unlock(&rs->rs_lock);
2949 spin_unlock(&svcpt->scp_rep_lock);
2951 /* purge the request queue. NB No new replies (rqbds
2952 * all unlinked) and no service threads, so I'm the only
2953 * thread noodling the request queue now */
2954 while (!list_empty(&svcpt->scp_req_incoming)) {
2955 req = list_entry(svcpt->scp_req_incoming.next,
2956 struct ptlrpc_request, rq_list);
2958 list_del(&req->rq_list);
2959 svcpt->scp_nreqs_incoming--;
2960 ptlrpc_server_finish_request(svcpt, req);
2963 while (ptlrpc_server_request_pending(svcpt, true)) {
2964 req = ptlrpc_server_request_get(svcpt, true);
2965 ptlrpc_server_finish_active_request(svcpt, req);
2968 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
2969 LASSERT(svcpt->scp_nreqs_incoming == 0);
2970 LASSERT(svcpt->scp_nreqs_active == 0);
2971 /* history should have been culled by
2972 * ptlrpc_server_finish_request */
2973 LASSERT(svcpt->scp_hist_nrqbds == 0);
2975 /* Now free all the request buffers since nothing
2976 * references them any more... */
2978 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2979 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
2980 struct ptlrpc_request_buffer_desc,
2982 ptlrpc_free_rqbd(rqbd);
2984 ptlrpc_wait_replies(svcpt);
2986 while (!list_empty(&svcpt->scp_rep_idle)) {
2987 rs = list_entry(svcpt->scp_rep_idle.next,
2988 struct ptlrpc_reply_state,
2990 list_del(&rs->rs_list);
2991 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
2997 ptlrpc_service_free(struct ptlrpc_service *svc)
2999 struct ptlrpc_service_part *svcpt;
3000 struct ptlrpc_at_array *array;
3003 ptlrpc_service_for_each_part(svcpt, i, svc) {
3004 if (svcpt->scp_service == NULL)
3007 /* In case somebody rearmed this in the meantime */
3008 cfs_timer_disarm(&svcpt->scp_at_timer);
3009 array = &svcpt->scp_at_array;
3011 if (array->paa_reqs_array != NULL) {
3012 OBD_FREE(array->paa_reqs_array,
3013 sizeof(struct list_head) * array->paa_size);
3014 array->paa_reqs_array = NULL;
3017 if (array->paa_reqs_count != NULL) {
3018 OBD_FREE(array->paa_reqs_count,
3019 sizeof(__u32) * array->paa_size);
3020 array->paa_reqs_count = NULL;
3024 ptlrpc_service_for_each_part(svcpt, i, svc)
3025 OBD_FREE_PTR(svcpt);
3027 if (svc->srv_cpts != NULL)
3028 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3030 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3031 srv_parts[svc->srv_ncpts]));
3034 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3036 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3038 service->srv_is_stopping = 1;
3040 mutex_lock(&ptlrpc_all_services_mutex);
3041 list_del_init(&service->srv_list);
3042 mutex_unlock(&ptlrpc_all_services_mutex);
3044 ptlrpc_service_del_atimer(service);
3045 ptlrpc_stop_all_threads(service);
3047 ptlrpc_service_unlink_rqbd(service);
3048 ptlrpc_service_purge_all(service);
3049 ptlrpc_service_nrs_cleanup(service);
3051 ptlrpc_lprocfs_unregister_service(service);
3053 ptlrpc_service_free(service);
3057 EXPORT_SYMBOL(ptlrpc_unregister_service);
3060 * Returns 0 if the service is healthy.
3062 * Right now, it just checks to make sure that requests aren't languishing
3063 * in the queue. We'll use this health check to govern whether a node needs
3064 * to be shot, so it's intentionally non-aggressive. */
3065 int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3067 struct ptlrpc_request *request = NULL;
3068 struct timeval right_now;
3071 do_gettimeofday(&right_now);
3073 spin_lock(&svcpt->scp_req_lock);
3074 /* How long has the next entry been waiting? */
3075 if (ptlrpc_server_high_pending(svcpt, true))
3076 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3077 else if (ptlrpc_server_normal_pending(svcpt, true))
3078 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3080 if (request == NULL) {
3081 spin_unlock(&svcpt->scp_req_lock);
3085 timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
3086 spin_unlock(&svcpt->scp_req_lock);
3088 if ((timediff / ONE_MILLION) >
3089 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3090 CERROR("%s: unhealthy - request has been waiting %lds\n",
3091 svcpt->scp_service->srv_name, timediff / ONE_MILLION);
3099 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3101 struct ptlrpc_service_part *svcpt;
3107 ptlrpc_service_for_each_part(svcpt, i, svc) {
3108 int rc = ptlrpc_svcpt_health_check(svcpt);
3115 EXPORT_SYMBOL(ptlrpc_service_health_check);