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 "../include/obd_support.h"
39 #include "../include/obd_class.h"
40 #include "../include/lustre_net.h"
41 #include "../include/lu_object.h"
42 #include "../../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 module_param(test_req_buffer_pressure, int, 0444);
48 MODULE_PARM_DESC(test_req_buffer_pressure, "set non-zero to put pressure on request buffer pools");
49 module_param(at_min, int, 0644);
50 MODULE_PARM_DESC(at_min, "Adaptive timeout minimum (sec)");
51 module_param(at_max, int, 0644);
52 MODULE_PARM_DESC(at_max, "Adaptive timeout maximum (sec)");
53 module_param(at_history, int, 0644);
54 MODULE_PARM_DESC(at_history,
55 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
56 module_param(at_early_margin, int, 0644);
57 MODULE_PARM_DESC(at_early_margin, "How soon before an RPC deadline to send an early reply");
58 module_param(at_extra, int, 0644);
59 MODULE_PARM_DESC(at_extra, "How much extra time to give with each early reply");
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 rqbd = kzalloc_node(sizeof(*rqbd), GFP_NOFS,
79 cfs_cpt_spread_node(svc->srv_cptable,
84 rqbd->rqbd_svcpt = svcpt;
85 rqbd->rqbd_refcount = 0;
86 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
87 rqbd->rqbd_cbid.cbid_arg = rqbd;
88 INIT_LIST_HEAD(&rqbd->rqbd_reqs);
89 OBD_CPT_ALLOC_LARGE(rqbd->rqbd_buffer, svc->srv_cptable,
90 svcpt->scp_cpt, svc->srv_buf_size);
91 if (rqbd->rqbd_buffer == NULL) {
96 spin_lock(&svcpt->scp_lock);
97 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
98 svcpt->scp_nrqbds_total++;
99 spin_unlock(&svcpt->scp_lock);
105 ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
107 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
109 LASSERT(rqbd->rqbd_refcount == 0);
110 LASSERT(list_empty(&rqbd->rqbd_reqs));
112 spin_lock(&svcpt->scp_lock);
113 list_del(&rqbd->rqbd_list);
114 svcpt->scp_nrqbds_total--;
115 spin_unlock(&svcpt->scp_lock);
117 OBD_FREE_LARGE(rqbd->rqbd_buffer, svcpt->scp_service->srv_buf_size);
122 ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
124 struct ptlrpc_service *svc = svcpt->scp_service;
125 struct ptlrpc_request_buffer_desc *rqbd;
129 if (svcpt->scp_rqbd_allocating)
132 spin_lock(&svcpt->scp_lock);
133 /* check again with lock */
134 if (svcpt->scp_rqbd_allocating) {
135 /* NB: we might allow more than one thread in the future */
136 LASSERT(svcpt->scp_rqbd_allocating == 1);
137 spin_unlock(&svcpt->scp_lock);
141 svcpt->scp_rqbd_allocating++;
142 spin_unlock(&svcpt->scp_lock);
145 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
146 /* NB: another thread might have recycled enough rqbds, we
147 * need to make sure it wouldn't over-allocate, see LU-1212. */
148 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group)
151 rqbd = ptlrpc_alloc_rqbd(svcpt);
154 CERROR("%s: Can't allocate request buffer\n",
161 spin_lock(&svcpt->scp_lock);
163 LASSERT(svcpt->scp_rqbd_allocating == 1);
164 svcpt->scp_rqbd_allocating--;
166 spin_unlock(&svcpt->scp_lock);
169 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
170 svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted,
171 svcpt->scp_nrqbds_total, rc);
175 rc = ptlrpc_server_post_idle_rqbds(svcpt);
181 * Part of Rep-Ack logic.
182 * Puts a lock and its mode into reply state associated to request reply.
185 ptlrpc_save_lock(struct ptlrpc_request *req,
186 struct lustre_handle *lock, int mode, int no_ack)
188 struct ptlrpc_reply_state *rs = req->rq_reply_state;
192 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
194 if (req->rq_export->exp_disconnected) {
195 ldlm_lock_decref(lock, mode);
197 idx = rs->rs_nlocks++;
198 rs->rs_locks[idx] = *lock;
199 rs->rs_modes[idx] = mode;
200 rs->rs_difficult = 1;
201 rs->rs_no_ack = !!no_ack;
204 EXPORT_SYMBOL(ptlrpc_save_lock);
207 struct ptlrpc_hr_partition;
209 struct ptlrpc_hr_thread {
210 int hrt_id; /* thread ID */
212 wait_queue_head_t hrt_waitq;
213 struct list_head hrt_queue; /* RS queue */
214 struct ptlrpc_hr_partition *hrt_partition;
217 struct ptlrpc_hr_partition {
218 /* # of started threads */
219 atomic_t hrp_nstarted;
220 /* # of stopped threads */
221 atomic_t hrp_nstopped;
222 /* cpu partition id */
224 /* round-robin rotor for choosing thread */
226 /* total number of threads on this partition */
229 struct ptlrpc_hr_thread *hrp_thrs;
232 #define HRT_RUNNING 0
233 #define HRT_STOPPING 1
235 struct ptlrpc_hr_service {
236 /* CPU partition table, it's just cfs_cpt_table for now */
237 struct cfs_cpt_table *hr_cpt_table;
238 /** controller sleep waitq */
239 wait_queue_head_t hr_waitq;
240 unsigned int hr_stopping;
241 /** roundrobin rotor for non-affinity service */
242 unsigned int hr_rotor;
244 struct ptlrpc_hr_partition **hr_partitions;
248 struct list_head rsb_replies;
249 unsigned int rsb_n_replies;
250 struct ptlrpc_service_part *rsb_svcpt;
253 /** reply handling service. */
254 static struct ptlrpc_hr_service ptlrpc_hr;
257 * maximum number of replies scheduled in one batch
259 #define MAX_SCHEDULED 256
262 * Initialize a reply batch.
266 static void rs_batch_init(struct rs_batch *b)
268 memset(b, 0, sizeof(*b));
269 INIT_LIST_HEAD(&b->rsb_replies);
273 * Choose an hr thread to dispatch requests to.
275 static struct ptlrpc_hr_thread *
276 ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
278 struct ptlrpc_hr_partition *hrp;
281 if (svcpt->scp_cpt >= 0 &&
282 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
283 /* directly match partition */
284 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
287 rotor = ptlrpc_hr.hr_rotor++;
288 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
290 hrp = ptlrpc_hr.hr_partitions[rotor];
293 rotor = hrp->hrp_rotor++;
294 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
298 * Dispatch all replies accumulated in the batch to one from
299 * dedicated reply handling threads.
303 static void rs_batch_dispatch(struct rs_batch *b)
305 if (b->rsb_n_replies != 0) {
306 struct ptlrpc_hr_thread *hrt;
308 hrt = ptlrpc_hr_select(b->rsb_svcpt);
310 spin_lock(&hrt->hrt_lock);
311 list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
312 spin_unlock(&hrt->hrt_lock);
314 wake_up(&hrt->hrt_waitq);
315 b->rsb_n_replies = 0;
320 * Add a reply to a batch.
321 * Add one reply object to a batch, schedule batched replies if overload.
326 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
328 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
330 if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
331 if (b->rsb_svcpt != NULL) {
332 rs_batch_dispatch(b);
333 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
335 spin_lock(&svcpt->scp_rep_lock);
336 b->rsb_svcpt = svcpt;
338 spin_lock(&rs->rs_lock);
339 rs->rs_scheduled_ever = 1;
340 if (rs->rs_scheduled == 0) {
341 list_move(&rs->rs_list, &b->rsb_replies);
342 rs->rs_scheduled = 1;
345 rs->rs_committed = 1;
346 spin_unlock(&rs->rs_lock);
350 * Reply batch finalization.
351 * Dispatch remaining replies from the batch
352 * and release remaining spinlock.
356 static void rs_batch_fini(struct rs_batch *b)
358 if (b->rsb_svcpt != NULL) {
359 rs_batch_dispatch(b);
360 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
364 #define DECLARE_RS_BATCH(b) struct rs_batch b
368 * Put reply state into a queue for processing because we received
369 * ACK from the client
371 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
373 struct ptlrpc_hr_thread *hrt;
375 LASSERT(list_empty(&rs->rs_list));
377 hrt = ptlrpc_hr_select(rs->rs_svcpt);
379 spin_lock(&hrt->hrt_lock);
380 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
381 spin_unlock(&hrt->hrt_lock);
383 wake_up(&hrt->hrt_waitq);
387 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
389 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
390 assert_spin_locked(&rs->rs_lock);
391 LASSERT(rs->rs_difficult);
392 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
394 if (rs->rs_scheduled) { /* being set up or already notified */
398 rs->rs_scheduled = 1;
399 list_del_init(&rs->rs_list);
400 ptlrpc_dispatch_difficult_reply(rs);
402 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
404 void ptlrpc_commit_replies(struct obd_export *exp)
406 struct ptlrpc_reply_state *rs, *nxt;
407 DECLARE_RS_BATCH(batch);
409 rs_batch_init(&batch);
410 /* Find any replies that have been committed and get their service
411 * to attend to complete them. */
413 /* CAVEAT EMPTOR: spinlock ordering!!! */
414 spin_lock(&exp->exp_uncommitted_replies_lock);
415 list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
417 LASSERT(rs->rs_difficult);
418 /* VBR: per-export last_committed */
419 LASSERT(rs->rs_export);
420 if (rs->rs_transno <= exp->exp_last_committed) {
421 list_del_init(&rs->rs_obd_list);
422 rs_batch_add(&batch, rs);
425 spin_unlock(&exp->exp_uncommitted_replies_lock);
426 rs_batch_fini(&batch);
428 EXPORT_SYMBOL(ptlrpc_commit_replies);
431 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
433 struct ptlrpc_request_buffer_desc *rqbd;
438 spin_lock(&svcpt->scp_lock);
440 if (list_empty(&svcpt->scp_rqbd_idle)) {
441 spin_unlock(&svcpt->scp_lock);
445 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
446 struct ptlrpc_request_buffer_desc,
448 list_del(&rqbd->rqbd_list);
450 /* assume we will post successfully */
451 svcpt->scp_nrqbds_posted++;
452 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
454 spin_unlock(&svcpt->scp_lock);
456 rc = ptlrpc_register_rqbd(rqbd);
463 spin_lock(&svcpt->scp_lock);
465 svcpt->scp_nrqbds_posted--;
466 list_del(&rqbd->rqbd_list);
467 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
469 /* Don't complain if no request buffers are posted right now; LNET
470 * won't drop requests because we set the portal lazy! */
472 spin_unlock(&svcpt->scp_lock);
477 static void ptlrpc_at_timer(unsigned long castmeharder)
479 struct ptlrpc_service_part *svcpt;
481 svcpt = (struct ptlrpc_service_part *)castmeharder;
483 svcpt->scp_at_check = 1;
484 svcpt->scp_at_checktime = cfs_time_current();
485 wake_up(&svcpt->scp_waitq);
489 ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
490 struct ptlrpc_service_conf *conf)
492 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
499 * Common code for estimating & validating threads number.
500 * CPT affinity service could have percpt thread-pool instead
501 * of a global thread-pool, which means user might not always
502 * get the threads number they give it in conf::tc_nthrs_user
503 * even they did set. It's because we need to validate threads
504 * number for each CPT to guarantee each pool will have enough
505 * threads to keep the service healthy.
507 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
508 init = max_t(int, init, tc->tc_nthrs_init);
510 /* NB: please see comments in lustre_lnet.h for definition
511 * details of these members */
512 LASSERT(tc->tc_nthrs_max != 0);
514 if (tc->tc_nthrs_user != 0) {
515 /* In case there is a reason to test a service with many
516 * threads, we give a less strict check here, it can
517 * be up to 8 * nthrs_max */
518 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
519 nthrs = total / svc->srv_ncpts;
520 init = max(init, nthrs);
524 total = tc->tc_nthrs_max;
525 if (tc->tc_nthrs_base == 0) {
526 /* don't care about base threads number per partition,
527 * this is most for non-affinity service */
528 nthrs = total / svc->srv_ncpts;
532 nthrs = tc->tc_nthrs_base;
533 if (svc->srv_ncpts == 1) {
536 /* NB: Increase the base number if it's single partition
537 * and total number of cores/HTs is larger or equal to 4.
538 * result will always < 2 * nthrs_base */
539 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
540 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
541 (tc->tc_nthrs_base >> i) != 0; i++)
542 nthrs += tc->tc_nthrs_base >> i;
545 if (tc->tc_thr_factor != 0) {
546 int factor = tc->tc_thr_factor;
550 * User wants to increase number of threads with for
551 * each CPU core/HT, most likely the factor is larger then
552 * one thread/core because service threads are supposed to
553 * be blocked by lock or wait for IO.
556 * Amdahl's law says that adding processors wouldn't give
557 * a linear increasing of parallelism, so it's nonsense to
558 * have too many threads no matter how many cores/HTs
561 /* weight is # of HTs */
562 if (cpumask_weight(topology_thread_cpumask(0)) > 1) {
563 /* depress thread factor for hyper-thread */
564 factor = factor - (factor >> 1) + (factor >> 3);
567 weight = cfs_cpt_weight(svc->srv_cptable, 0);
570 for (; factor > 0 && weight > 0; factor--, weight -= fade)
571 nthrs += min(weight, fade) * factor;
574 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
575 nthrs = max(tc->tc_nthrs_base,
576 tc->tc_nthrs_max / svc->srv_ncpts);
579 nthrs = max(nthrs, tc->tc_nthrs_init);
580 svc->srv_nthrs_cpt_limit = nthrs;
581 svc->srv_nthrs_cpt_init = init;
583 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
584 CDEBUG(D_OTHER, "%s: This service may have more threads (%d) 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 /* active 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 array->paa_reqs_array =
636 kzalloc_node(sizeof(struct list_head) * size, GFP_NOFS,
637 cfs_cpt_spread_node(svc->srv_cptable, cpt));
638 if (array->paa_reqs_array == NULL)
641 for (index = 0; index < size; index++)
642 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
644 array->paa_reqs_count =
645 kzalloc_node(sizeof(__u32) * size, GFP_NOFS,
646 cfs_cpt_spread_node(svc->srv_cptable, cpt));
647 if (array->paa_reqs_count == NULL)
648 goto free_reqs_array;
650 cfs_timer_init(&svcpt->scp_at_timer, ptlrpc_at_timer, svcpt);
651 /* At SOW, service time should be quick; 10s seems generous. If client
652 * timeout is less than this, we'll be sending an early reply. */
653 at_init(&svcpt->scp_at_estimate, 10, 0);
655 /* assign this before call ptlrpc_grow_req_bufs */
656 svcpt->scp_service = svc;
657 /* Now allocate the request buffers, but don't post them now */
658 rc = ptlrpc_grow_req_bufs(svcpt, 0);
659 /* We shouldn't be under memory pressure at startup, so
660 * fail if we can't allocate all our buffers at this time. */
662 goto free_reqs_count;
667 kfree(array->paa_reqs_count);
668 array->paa_reqs_count = NULL;
670 kfree(array->paa_reqs_array);
671 array->paa_reqs_array = NULL;
677 * Initialize service on a given portal.
678 * This includes starting serving threads , allocating and posting rqbds and
681 struct ptlrpc_service *
682 ptlrpc_register_service(struct ptlrpc_service_conf *conf,
684 struct dentry *debugfs_entry)
686 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
687 struct ptlrpc_service *service;
688 struct ptlrpc_service_part *svcpt;
689 struct cfs_cpt_table *cptable;
696 LASSERT(conf->psc_buf.bc_nbufs > 0);
697 LASSERT(conf->psc_buf.bc_buf_size >=
698 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
699 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
701 cptable = cconf->cc_cptable;
703 cptable = cfs_cpt_table;
705 if (!conf->psc_thr.tc_cpu_affinity) {
708 ncpts = cfs_cpt_number(cptable);
709 if (cconf->cc_pattern != NULL) {
710 struct cfs_expr_list *el;
712 rc = cfs_expr_list_parse(cconf->cc_pattern,
713 strlen(cconf->cc_pattern),
716 CERROR("%s: invalid CPT pattern string: %s",
717 conf->psc_name, cconf->cc_pattern);
718 return ERR_PTR(-EINVAL);
721 rc = cfs_expr_list_values(el, ncpts, &cpts);
722 cfs_expr_list_free(el);
724 CERROR("%s: failed to parse CPT array %s: %d\n",
725 conf->psc_name, cconf->cc_pattern, rc);
727 return ERR_PTR(rc < 0 ? rc : -EINVAL);
733 service = kzalloc(offsetof(struct ptlrpc_service, srv_parts[ncpts]),
735 if (service == NULL) {
737 return ERR_PTR(-ENOMEM);
740 service->srv_cptable = cptable;
741 service->srv_cpts = cpts;
742 service->srv_ncpts = ncpts;
744 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
745 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
746 service->srv_cpt_bits++;
749 spin_lock_init(&service->srv_lock);
750 service->srv_name = conf->psc_name;
751 service->srv_watchdog_factor = conf->psc_watchdog_factor;
752 INIT_LIST_HEAD(&service->srv_list); /* for safety of cleanup */
754 /* buffer configuration */
755 service->srv_nbuf_per_group = test_req_buffer_pressure ?
756 1 : conf->psc_buf.bc_nbufs;
757 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
759 service->srv_buf_size = conf->psc_buf.bc_buf_size;
760 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
761 service->srv_req_portal = conf->psc_buf.bc_req_portal;
763 /* Increase max reply size to next power of two */
764 service->srv_max_reply_size = 1;
765 while (service->srv_max_reply_size <
766 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
767 service->srv_max_reply_size <<= 1;
769 service->srv_thread_name = conf->psc_thr.tc_thr_name;
770 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
771 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
772 service->srv_ops = conf->psc_ops;
774 for (i = 0; i < ncpts; i++) {
775 if (!conf->psc_thr.tc_cpu_affinity)
778 cpt = cpts != NULL ? cpts[i] : i;
780 svcpt = kzalloc_node(sizeof(*svcpt), GFP_NOFS,
781 cfs_cpt_spread_node(cptable, cpt));
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);
803 rc = ptlrpc_sysfs_register_service(parent, service);
808 if (!IS_ERR_OR_NULL(debugfs_entry))
809 ptlrpc_ldebugfs_register_service(debugfs_entry, service);
811 rc = ptlrpc_service_nrs_setup(service);
815 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
816 service->srv_name, service->srv_req_portal);
818 rc = ptlrpc_start_threads(service);
820 CERROR("Failed to start threads for service %s: %d\n",
821 service->srv_name, rc);
827 ptlrpc_unregister_service(service);
830 EXPORT_SYMBOL(ptlrpc_register_service);
833 * to actually free the request, must be called without holding svc_lock.
834 * note it's caller's responsibility to unlink req->rq_list.
836 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
838 LASSERT(atomic_read(&req->rq_refcount) == 0);
839 LASSERT(list_empty(&req->rq_timed_list));
841 /* DEBUG_REQ() assumes the reply state of a request with a valid
842 * ref will not be destroyed until that reference is dropped. */
843 ptlrpc_req_drop_rs(req);
845 sptlrpc_svc_ctx_decref(req);
847 if (req != &req->rq_rqbd->rqbd_req) {
848 /* NB request buffers use an embedded
849 * req if the incoming req unlinked the
850 * MD; this isn't one of them! */
851 ptlrpc_request_cache_free(req);
856 * drop a reference count of the request. if it reaches 0, we either
857 * put it into history list, or free it immediately.
859 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
861 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
862 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
863 struct ptlrpc_service *svc = svcpt->scp_service;
865 struct list_head *tmp;
866 struct list_head *nxt;
868 if (!atomic_dec_and_test(&req->rq_refcount))
871 if (req->rq_at_linked) {
872 spin_lock(&svcpt->scp_at_lock);
873 /* recheck with lock, in case it's unlinked by
874 * ptlrpc_at_check_timed() */
875 if (likely(req->rq_at_linked))
876 ptlrpc_at_remove_timed(req);
877 spin_unlock(&svcpt->scp_at_lock);
880 LASSERT(list_empty(&req->rq_timed_list));
882 /* finalize request */
883 if (req->rq_export) {
884 class_export_put(req->rq_export);
885 req->rq_export = NULL;
888 spin_lock(&svcpt->scp_lock);
890 list_add(&req->rq_list, &rqbd->rqbd_reqs);
892 refcount = --(rqbd->rqbd_refcount);
894 /* request buffer is now idle: add to history */
895 list_del(&rqbd->rqbd_list);
897 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
898 svcpt->scp_hist_nrqbds++;
900 /* cull some history?
901 * I expect only about 1 or 2 rqbds need to be recycled here */
902 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
903 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
904 struct ptlrpc_request_buffer_desc,
907 list_del(&rqbd->rqbd_list);
908 svcpt->scp_hist_nrqbds--;
910 /* remove rqbd's reqs from svc's req history while
911 * I've got the service lock */
912 list_for_each(tmp, &rqbd->rqbd_reqs) {
913 req = list_entry(tmp, struct ptlrpc_request,
915 /* Track the highest culled req seq */
916 if (req->rq_history_seq >
917 svcpt->scp_hist_seq_culled) {
918 svcpt->scp_hist_seq_culled =
921 list_del(&req->rq_history_list);
924 spin_unlock(&svcpt->scp_lock);
926 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
927 req = list_entry(rqbd->rqbd_reqs.next,
928 struct ptlrpc_request,
930 list_del(&req->rq_list);
931 ptlrpc_server_free_request(req);
934 spin_lock(&svcpt->scp_lock);
936 * now all reqs including the embedded req has been
937 * disposed, schedule request buffer for re-use.
939 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) ==
941 list_add_tail(&rqbd->rqbd_list,
942 &svcpt->scp_rqbd_idle);
945 spin_unlock(&svcpt->scp_lock);
946 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
947 /* If we are low on memory, we are not interested in history */
948 list_del(&req->rq_list);
949 list_del_init(&req->rq_history_list);
951 /* Track the highest culled req seq */
952 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
953 svcpt->scp_hist_seq_culled = req->rq_history_seq;
955 spin_unlock(&svcpt->scp_lock);
957 ptlrpc_server_free_request(req);
959 spin_unlock(&svcpt->scp_lock);
963 /** Change request export and move hp request from old export to new */
964 void ptlrpc_request_change_export(struct ptlrpc_request *req,
965 struct obd_export *export)
967 if (req->rq_export != NULL) {
968 if (!list_empty(&req->rq_exp_list)) {
969 /* remove rq_exp_list from last export */
970 spin_lock_bh(&req->rq_export->exp_rpc_lock);
971 list_del_init(&req->rq_exp_list);
972 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
974 /* export has one reference already, so it`s safe to
975 * add req to export queue here and get another
976 * reference for request later */
977 spin_lock_bh(&export->exp_rpc_lock);
978 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
979 spin_unlock_bh(&export->exp_rpc_lock);
981 class_export_rpc_dec(req->rq_export);
982 class_export_put(req->rq_export);
985 /* request takes one export refcount */
986 req->rq_export = class_export_get(export);
987 class_export_rpc_inc(export);
993 * to finish a request: stop sending more early replies, and release
996 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
997 struct ptlrpc_request *req)
999 ptlrpc_server_hpreq_fini(req);
1001 ptlrpc_server_drop_request(req);
1005 * to finish a active request: stop sending more early replies, and release
1006 * the request. should be called after we finished handling the request.
1008 static void ptlrpc_server_finish_active_request(
1009 struct ptlrpc_service_part *svcpt,
1010 struct ptlrpc_request *req)
1012 spin_lock(&svcpt->scp_req_lock);
1013 ptlrpc_nrs_req_stop_nolock(req);
1014 svcpt->scp_nreqs_active--;
1016 svcpt->scp_nhreqs_active--;
1017 spin_unlock(&svcpt->scp_req_lock);
1019 ptlrpc_nrs_req_finalize(req);
1021 if (req->rq_export != NULL)
1022 class_export_rpc_dec(req->rq_export);
1024 ptlrpc_server_finish_request(svcpt, req);
1028 * This function makes sure dead exports are evicted in a timely manner.
1029 * This function is only called when some export receives a message (i.e.,
1030 * the network is up.)
1032 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
1034 struct obd_export *oldest_exp;
1035 time_t oldest_time, new_time;
1039 /* Compensate for slow machines, etc, by faking our request time
1040 into the future. Although this can break the strict time-ordering
1041 of the list, we can be really lazy here - we don't have to evict
1042 at the exact right moment. Eventually, all silent exports
1043 will make it to the top of the list. */
1045 /* Do not pay attention on 1sec or smaller renewals. */
1046 new_time = get_seconds() + extra_delay;
1047 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1050 exp->exp_last_request_time = new_time;
1052 /* exports may get disconnected from the chain even though the
1053 export has references, so we must keep the spin lock while
1054 manipulating the lists */
1055 spin_lock(&exp->exp_obd->obd_dev_lock);
1057 if (list_empty(&exp->exp_obd_chain_timed)) {
1058 /* this one is not timed */
1059 spin_unlock(&exp->exp_obd->obd_dev_lock);
1063 list_move_tail(&exp->exp_obd_chain_timed,
1064 &exp->exp_obd->obd_exports_timed);
1066 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1067 struct obd_export, exp_obd_chain_timed);
1068 oldest_time = oldest_exp->exp_last_request_time;
1069 spin_unlock(&exp->exp_obd->obd_dev_lock);
1071 if (exp->exp_obd->obd_recovering) {
1072 /* be nice to everyone during recovery */
1076 /* Note - racing to start/reset the obd_eviction timer is safe */
1077 if (exp->exp_obd->obd_eviction_timer == 0) {
1078 /* Check if the oldest entry is expired. */
1079 if (get_seconds() > (oldest_time + PING_EVICT_TIMEOUT +
1081 /* We need a second timer, in case the net was down and
1082 * it just came back. Since the pinger may skip every
1083 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1084 * we better wait for 3. */
1085 exp->exp_obd->obd_eviction_timer =
1086 get_seconds() + 3 * PING_INTERVAL;
1087 CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
1088 exp->exp_obd->obd_name,
1089 obd_export_nid2str(oldest_exp), oldest_time);
1093 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1094 /* The evictor won't evict anyone who we've heard from
1095 * recently, so we don't have to check before we start
1097 if (!ping_evictor_wake(exp))
1098 exp->exp_obd->obd_eviction_timer = 0;
1104 * Sanity check request \a req.
1105 * Return 0 if all is ok, error code otherwise.
1107 static int ptlrpc_check_req(struct ptlrpc_request *req)
1109 struct obd_device *obd = req->rq_export->exp_obd;
1112 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1113 req->rq_export->exp_conn_cnt)) {
1114 DEBUG_REQ(D_RPCTRACE, req,
1115 "DROPPING req from old connection %d < %d",
1116 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1117 req->rq_export->exp_conn_cnt);
1120 if (unlikely(obd == NULL || obd->obd_fail)) {
1122 * Failing over, don't handle any more reqs, send
1123 * error response instead.
1125 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1126 req, (obd != NULL) ? obd->obd_name : "unknown");
1128 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1129 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1130 !obd->obd_recovering) {
1131 DEBUG_REQ(D_ERROR, req,
1132 "Invalid replay without recovery");
1133 class_fail_export(req->rq_export);
1135 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1136 !obd->obd_recovering) {
1137 DEBUG_REQ(D_ERROR, req, "Invalid req with transno %llu without recovery",
1138 lustre_msg_get_transno(req->rq_reqmsg));
1139 class_fail_export(req->rq_export);
1143 if (unlikely(rc < 0)) {
1144 req->rq_status = rc;
1150 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1152 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1155 if (array->paa_count == 0) {
1156 cfs_timer_disarm(&svcpt->scp_at_timer);
1160 /* Set timer for closest deadline */
1161 next = (__s32)(array->paa_deadline - get_seconds() -
1164 ptlrpc_at_timer((unsigned long)svcpt);
1166 cfs_timer_arm(&svcpt->scp_at_timer, cfs_time_shift(next));
1167 CDEBUG(D_INFO, "armed %s at %+ds\n",
1168 svcpt->scp_service->srv_name, next);
1172 /* Add rpc to early reply check list */
1173 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1175 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1176 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1177 struct ptlrpc_request *rq = NULL;
1183 if (req->rq_no_reply)
1186 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1189 spin_lock(&svcpt->scp_at_lock);
1190 LASSERT(list_empty(&req->rq_timed_list));
1192 index = (unsigned long)req->rq_deadline % array->paa_size;
1193 if (array->paa_reqs_count[index] > 0) {
1194 /* latest rpcs will have the latest deadlines in the list,
1195 * so search backward. */
1196 list_for_each_entry_reverse(rq,
1197 &array->paa_reqs_array[index],
1199 if (req->rq_deadline >= rq->rq_deadline) {
1200 list_add(&req->rq_timed_list,
1201 &rq->rq_timed_list);
1207 /* Add the request at the head of the list */
1208 if (list_empty(&req->rq_timed_list))
1209 list_add(&req->rq_timed_list,
1210 &array->paa_reqs_array[index]);
1212 spin_lock(&req->rq_lock);
1213 req->rq_at_linked = 1;
1214 spin_unlock(&req->rq_lock);
1215 req->rq_at_index = index;
1216 array->paa_reqs_count[index]++;
1218 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1219 array->paa_deadline = req->rq_deadline;
1220 ptlrpc_at_set_timer(svcpt);
1222 spin_unlock(&svcpt->scp_at_lock);
1228 ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1230 struct ptlrpc_at_array *array;
1232 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1234 /* NB: must call with hold svcpt::scp_at_lock */
1235 LASSERT(!list_empty(&req->rq_timed_list));
1236 list_del_init(&req->rq_timed_list);
1238 spin_lock(&req->rq_lock);
1239 req->rq_at_linked = 0;
1240 spin_unlock(&req->rq_lock);
1242 array->paa_reqs_count[req->rq_at_index]--;
1246 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1248 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1249 struct ptlrpc_request *reqcopy;
1250 struct lustre_msg *reqmsg;
1251 long olddl = req->rq_deadline - get_seconds();
1255 /* deadline is when the client expects us to reply, margin is the
1256 difference between clients' and servers' expectations */
1257 DEBUG_REQ(D_ADAPTTO, req,
1258 "%ssending early reply (deadline %+lds, margin %+lds) for %d+%d",
1259 AT_OFF ? "AT off - not " : "",
1260 olddl, olddl - at_get(&svcpt->scp_at_estimate),
1261 at_get(&svcpt->scp_at_estimate), at_extra);
1267 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), not sending early reply. Consider increasing at_early_margin (%d)?",
1268 olddl, at_early_margin);
1270 /* Return an error so we're not re-added to the timed list. */
1274 if (!(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
1275 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, but no AT support");
1279 if (req->rq_export &&
1280 lustre_msg_get_flags(req->rq_reqmsg) &
1281 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1282 /* During recovery, we don't want to send too many early
1283 * replies, but on the other hand we want to make sure the
1284 * client has enough time to resend if the rpc is lost. So
1285 * during the recovery period send at least 4 early replies,
1286 * spacing them every at_extra if we can. at_estimate should
1287 * always equal this fixed value during recovery. */
1288 at_measured(&svcpt->scp_at_estimate, min(at_extra,
1289 req->rq_export->exp_obd->obd_recovery_timeout / 4));
1291 /* Fake our processing time into the future to ask the clients
1292 * for some extra amount of time */
1293 at_measured(&svcpt->scp_at_estimate, at_extra +
1295 req->rq_arrival_time.tv_sec);
1297 /* Check to see if we've actually increased the deadline -
1298 * we may be past adaptive_max */
1299 if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
1300 at_get(&svcpt->scp_at_estimate)) {
1301 DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%ld/%ld), not sending early reply\n",
1302 olddl, req->rq_arrival_time.tv_sec +
1303 at_get(&svcpt->scp_at_estimate) -
1308 newdl = get_seconds() + at_get(&svcpt->scp_at_estimate);
1310 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1311 if (reqcopy == NULL)
1313 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1320 reqcopy->rq_reply_state = NULL;
1321 reqcopy->rq_rep_swab_mask = 0;
1322 reqcopy->rq_pack_bulk = 0;
1323 reqcopy->rq_pack_udesc = 0;
1324 reqcopy->rq_packed_final = 0;
1325 sptlrpc_svc_ctx_addref(reqcopy);
1326 /* We only need the reqmsg for the magic */
1327 reqcopy->rq_reqmsg = reqmsg;
1328 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1330 LASSERT(atomic_read(&req->rq_refcount));
1331 /** if it is last refcount then early reply isn't needed */
1332 if (atomic_read(&req->rq_refcount) == 1) {
1333 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, abort sending early reply\n");
1338 /* Connection ref */
1339 reqcopy->rq_export = class_conn2export(
1340 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1341 if (reqcopy->rq_export == NULL) {
1347 class_export_rpc_inc(reqcopy->rq_export);
1348 if (reqcopy->rq_export->exp_obd &&
1349 reqcopy->rq_export->exp_obd->obd_fail) {
1354 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1358 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1361 /* Adjust our own deadline to what we told the client */
1362 req->rq_deadline = newdl;
1363 req->rq_early_count++; /* number sent, server side */
1365 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1368 /* Free the (early) reply state from lustre_pack_reply.
1369 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1370 ptlrpc_req_drop_rs(reqcopy);
1373 class_export_rpc_dec(reqcopy->rq_export);
1374 class_export_put(reqcopy->rq_export);
1376 sptlrpc_svc_ctx_decref(reqcopy);
1377 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1379 ptlrpc_request_cache_free(reqcopy);
1383 /* Send early replies to everybody expiring within at_early_margin
1384 asking for at_extra time */
1385 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1387 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1388 struct ptlrpc_request *rq, *n;
1389 struct list_head work_list;
1392 time_t now = get_seconds();
1394 int first, counter = 0;
1396 spin_lock(&svcpt->scp_at_lock);
1397 if (svcpt->scp_at_check == 0) {
1398 spin_unlock(&svcpt->scp_at_lock);
1401 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1402 svcpt->scp_at_check = 0;
1404 if (array->paa_count == 0) {
1405 spin_unlock(&svcpt->scp_at_lock);
1409 /* The timer went off, but maybe the nearest rpc already completed. */
1410 first = array->paa_deadline - now;
1411 if (first > at_early_margin) {
1412 /* We've still got plenty of time. Reset the timer. */
1413 ptlrpc_at_set_timer(svcpt);
1414 spin_unlock(&svcpt->scp_at_lock);
1418 /* We're close to a timeout, and we don't know how much longer the
1419 server will take. Send early replies to everyone expiring soon. */
1420 INIT_LIST_HEAD(&work_list);
1422 index = (unsigned long)array->paa_deadline % array->paa_size;
1423 count = array->paa_count;
1425 count -= array->paa_reqs_count[index];
1426 list_for_each_entry_safe(rq, n,
1427 &array->paa_reqs_array[index],
1429 if (rq->rq_deadline > now + at_early_margin) {
1430 /* update the earliest deadline */
1431 if (deadline == -1 ||
1432 rq->rq_deadline < deadline)
1433 deadline = rq->rq_deadline;
1437 ptlrpc_at_remove_timed(rq);
1439 * ptlrpc_server_drop_request() may drop
1440 * refcount to 0 already. Let's check this and
1441 * don't add entry to work_list
1443 if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
1444 list_add(&rq->rq_timed_list, &work_list);
1448 if (++index >= array->paa_size)
1451 array->paa_deadline = deadline;
1452 /* we have a new earliest deadline, restart the timer */
1453 ptlrpc_at_set_timer(svcpt);
1455 spin_unlock(&svcpt->scp_at_lock);
1457 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early replies\n",
1458 first, at_extra, counter);
1460 /* We're already past request deadlines before we even get a
1461 chance to send early replies */
1462 LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
1463 svcpt->scp_service->srv_name);
1464 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=" CFS_DURATION_T "(jiff)\n",
1465 counter, svcpt->scp_nreqs_incoming,
1466 svcpt->scp_nreqs_active,
1467 at_get(&svcpt->scp_at_estimate), delay);
1470 /* we took additional refcount so entries can't be deleted from list, no
1471 * locking is needed */
1472 while (!list_empty(&work_list)) {
1473 rq = list_entry(work_list.next, struct ptlrpc_request,
1475 list_del_init(&rq->rq_timed_list);
1477 if (ptlrpc_at_send_early_reply(rq) == 0)
1478 ptlrpc_at_add_timed(rq);
1480 ptlrpc_server_drop_request(rq);
1483 return 1; /* return "did_something" for liblustre */
1487 * Put the request to the export list if the request may become
1488 * a high priority one.
1490 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1491 struct ptlrpc_request *req)
1495 if (svcpt->scp_service->srv_ops.so_hpreq_handler) {
1496 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1501 if (req->rq_export && req->rq_ops) {
1502 /* Perform request specific check. We should do this check
1503 * before the request is added into exp_hp_rpcs list otherwise
1504 * it may hit swab race at LU-1044. */
1505 if (req->rq_ops->hpreq_check) {
1506 rc = req->rq_ops->hpreq_check(req);
1508 * XXX: Out of all current
1509 * ptlrpc_hpreq_ops::hpreq_check(), only
1510 * ldlm_cancel_hpreq_check() can return an error code;
1511 * other functions assert in similar places, which seems
1512 * odd. What also does not seem right is that handlers
1513 * for those RPCs do not assert on the same checks, but
1514 * rather handle the error cases. e.g. see
1515 * ost_rw_hpreq_check(), and ost_brw_read(),
1520 LASSERT(rc == 0 || rc == 1);
1523 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1524 list_add(&req->rq_exp_list,
1525 &req->rq_export->exp_hp_rpcs);
1526 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1529 ptlrpc_nrs_req_initialize(svcpt, req, rc);
1534 /** Remove the request from the export list. */
1535 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1537 if (req->rq_export && req->rq_ops) {
1538 /* refresh lock timeout again so that client has more
1539 * room to send lock cancel RPC. */
1540 if (req->rq_ops->hpreq_fini)
1541 req->rq_ops->hpreq_fini(req);
1543 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1544 list_del_init(&req->rq_exp_list);
1545 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1549 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1554 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1555 .hpreq_check = ptlrpc_hpreq_check,
1558 /* Hi-Priority RPC check by RPC operation code. */
1559 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1561 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1563 /* Check for export to let only reconnects for not yet evicted
1564 * export to become a HP rpc. */
1565 if ((req->rq_export != NULL) &&
1566 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1567 req->rq_ops = &ptlrpc_hpreq_common;
1571 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1573 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1574 struct ptlrpc_request *req)
1578 rc = ptlrpc_server_hpreq_init(svcpt, req);
1582 ptlrpc_nrs_req_add(svcpt, req, !!rc);
1588 * Allow to handle high priority request
1589 * User can call it w/o any lock but need to hold
1590 * ptlrpc_service_part::scp_req_lock to get reliable result
1592 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1595 int running = svcpt->scp_nthrs_running;
1597 if (!nrs_svcpt_has_hp(svcpt))
1603 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1604 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1605 /* leave just 1 thread for normal RPCs */
1606 running = PTLRPC_NTHRS_INIT;
1607 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1611 if (svcpt->scp_nreqs_active >= running - 1)
1614 if (svcpt->scp_nhreqs_active == 0)
1617 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1618 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1621 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1624 return ptlrpc_server_allow_high(svcpt, force) &&
1625 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1629 * Only allow normal priority requests on a service that has a high-priority
1630 * queue if forced (i.e. cleanup), if there are other high priority requests
1631 * already being processed (i.e. those threads can service more high-priority
1632 * requests), or if there are enough idle threads that a later thread can do
1633 * a high priority request.
1634 * User can call it w/o any lock but need to hold
1635 * ptlrpc_service_part::scp_req_lock to get reliable result
1637 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1640 int running = svcpt->scp_nthrs_running;
1641 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1642 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1643 /* leave just 1 thread for normal RPCs */
1644 running = PTLRPC_NTHRS_INIT;
1645 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1650 svcpt->scp_nreqs_active < running - 2)
1653 if (svcpt->scp_nreqs_active >= running - 1)
1656 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1659 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1662 return ptlrpc_server_allow_normal(svcpt, force) &&
1663 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1667 * Returns true if there are requests available in incoming
1668 * request queue for processing and it is allowed to fetch them.
1669 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1670 * to get reliable result
1671 * \see ptlrpc_server_allow_normal
1672 * \see ptlrpc_server_allow high
1675 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1677 return ptlrpc_server_high_pending(svcpt, force) ||
1678 ptlrpc_server_normal_pending(svcpt, force);
1682 * Fetch a request for processing from queue of unprocessed requests.
1683 * Favors high-priority requests.
1684 * Returns a pointer to fetched request.
1686 static struct ptlrpc_request *
1687 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1689 struct ptlrpc_request *req = NULL;
1691 spin_lock(&svcpt->scp_req_lock);
1693 if (ptlrpc_server_high_pending(svcpt, force)) {
1694 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1696 svcpt->scp_hreq_count++;
1701 if (ptlrpc_server_normal_pending(svcpt, force)) {
1702 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1704 svcpt->scp_hreq_count = 0;
1709 spin_unlock(&svcpt->scp_req_lock);
1713 svcpt->scp_nreqs_active++;
1715 svcpt->scp_nhreqs_active++;
1717 spin_unlock(&svcpt->scp_req_lock);
1719 if (likely(req->rq_export))
1720 class_export_rpc_inc(req->rq_export);
1726 * Handle freshly incoming reqs, add to timed early reply list,
1727 * pass on to regular request queue.
1728 * All incoming requests pass through here before getting into
1729 * ptlrpc_server_handle_req later on.
1732 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1733 struct ptlrpc_thread *thread)
1735 struct ptlrpc_service *svc = svcpt->scp_service;
1736 struct ptlrpc_request *req;
1740 spin_lock(&svcpt->scp_lock);
1741 if (list_empty(&svcpt->scp_req_incoming)) {
1742 spin_unlock(&svcpt->scp_lock);
1746 req = list_entry(svcpt->scp_req_incoming.next,
1747 struct ptlrpc_request, rq_list);
1748 list_del_init(&req->rq_list);
1749 svcpt->scp_nreqs_incoming--;
1750 /* Consider this still a "queued" request as far as stats are
1752 spin_unlock(&svcpt->scp_lock);
1754 /* go through security check/transform */
1755 rc = sptlrpc_svc_unwrap_request(req);
1759 case SECSVC_COMPLETE:
1760 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1769 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1770 * redo it wouldn't be harmful.
1772 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1773 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1775 CERROR("error unpacking request: ptl %d from %s x%llu\n",
1776 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1782 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1784 CERROR("error unpacking ptlrpc body: ptl %d from %s x%llu\n",
1785 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1790 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1791 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1792 CERROR("drop incoming rpc opc %u, x%llu\n",
1793 cfs_fail_val, req->rq_xid);
1798 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1799 CERROR("wrong packet type received (type=%u) from %s\n",
1800 lustre_msg_get_type(req->rq_reqmsg),
1801 libcfs_id2str(req->rq_peer));
1805 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1808 req->rq_bulk_write = 1;
1812 case MGS_CONFIG_READ:
1813 req->rq_bulk_read = 1;
1817 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
1819 req->rq_export = class_conn2export(
1820 lustre_msg_get_handle(req->rq_reqmsg));
1821 if (req->rq_export) {
1822 rc = ptlrpc_check_req(req);
1824 rc = sptlrpc_target_export_check(req->rq_export, req);
1826 DEBUG_REQ(D_ERROR, req, "DROPPING req with illegal security flavor,");
1831 ptlrpc_update_export_timer(req->rq_export, 0);
1834 /* req_in handling should/must be fast */
1835 if (get_seconds() - req->rq_arrival_time.tv_sec > 5)
1836 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1837 cfs_time_sub(get_seconds(),
1838 req->rq_arrival_time.tv_sec));
1840 /* Set rpc server deadline and add it to the timed list */
1841 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1842 MSGHDR_AT_SUPPORT) ?
1843 /* The max time the client expects us to take */
1844 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1845 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1846 if (unlikely(deadline == 0)) {
1847 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1851 req->rq_svc_thread = thread;
1853 ptlrpc_at_add_timed(req);
1855 /* Move it over to the request processing queue */
1856 rc = ptlrpc_server_request_add(svcpt, req);
1860 wake_up(&svcpt->scp_waitq);
1864 ptlrpc_server_finish_request(svcpt, req);
1870 * Main incoming request handling logic.
1871 * Calls handler function from service to do actual processing.
1874 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
1875 struct ptlrpc_thread *thread)
1877 struct ptlrpc_service *svc = svcpt->scp_service;
1878 struct ptlrpc_request *request;
1879 struct timeval work_start;
1880 struct timeval work_end;
1885 request = ptlrpc_server_request_get(svcpt, false);
1886 if (request == NULL)
1889 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1890 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1891 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1892 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1894 if (unlikely(fail_opc)) {
1895 if (request->rq_export && request->rq_ops)
1896 OBD_FAIL_TIMEOUT(fail_opc, 4);
1899 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1901 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1902 libcfs_debug_dumplog();
1904 do_gettimeofday(&work_start);
1905 timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,
1907 if (likely(svc->srv_stats != NULL)) {
1908 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1910 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1911 svcpt->scp_nreqs_incoming);
1912 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1913 svcpt->scp_nreqs_active);
1914 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1915 at_get(&svcpt->scp_at_estimate));
1918 rc = lu_context_init(&request->rq_session, LCT_SESSION | LCT_NOREF);
1920 CERROR("Failure to initialize session: %d\n", rc);
1923 request->rq_session.lc_thread = thread;
1924 request->rq_session.lc_cookie = 0x5;
1925 lu_context_enter(&request->rq_session);
1927 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
1929 request->rq_svc_thread = thread;
1931 request->rq_svc_thread->t_env->le_ses = &request->rq_session;
1933 if (likely(request->rq_export)) {
1934 if (unlikely(ptlrpc_check_req(request)))
1936 ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
1939 /* Discard requests queued for longer than the deadline.
1940 The deadline is increased if we send an early reply. */
1941 if (get_seconds() > request->rq_deadline) {
1942 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline " CFS_DURATION_T ":" CFS_DURATION_T "s ago\n",
1943 libcfs_id2str(request->rq_peer),
1944 cfs_time_sub(request->rq_deadline,
1945 request->rq_arrival_time.tv_sec),
1946 cfs_time_sub(get_seconds(),
1947 request->rq_deadline));
1951 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d\n",
1953 (request->rq_export ?
1954 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1955 (request->rq_export ?
1956 atomic_read(&request->rq_export->exp_refcount) : -99),
1957 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1958 libcfs_id2str(request->rq_peer),
1959 lustre_msg_get_opc(request->rq_reqmsg));
1961 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1962 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
1964 rc = svc->srv_ops.so_req_handler(request);
1966 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1969 lu_context_exit(&request->rq_session);
1970 lu_context_fini(&request->rq_session);
1972 if (unlikely(get_seconds() > request->rq_deadline)) {
1973 DEBUG_REQ(D_WARNING, request,
1974 "Request took longer than estimated ("
1975 CFS_DURATION_T":"CFS_DURATION_T
1976 "s); client may timeout.",
1977 cfs_time_sub(request->rq_deadline,
1978 request->rq_arrival_time.tv_sec),
1979 cfs_time_sub(get_seconds(),
1980 request->rq_deadline));
1983 do_gettimeofday(&work_end);
1984 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
1985 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d Request processed in %ldus (%ldus total) trans %llu rc %d/%d\n",
1987 (request->rq_export ?
1988 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1989 (request->rq_export ?
1990 atomic_read(&request->rq_export->exp_refcount) : -99),
1991 lustre_msg_get_status(request->rq_reqmsg),
1993 libcfs_id2str(request->rq_peer),
1994 lustre_msg_get_opc(request->rq_reqmsg),
1996 cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
1997 (request->rq_repmsg ?
1998 lustre_msg_get_transno(request->rq_repmsg) :
1999 request->rq_transno),
2001 (request->rq_repmsg ?
2002 lustre_msg_get_status(request->rq_repmsg) : -999));
2003 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2004 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2005 int opc = opcode_offset(op);
2006 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2007 LASSERT(opc < LUSTRE_MAX_OPCODES);
2008 lprocfs_counter_add(svc->srv_stats,
2009 opc + EXTRA_MAX_OPCODES,
2013 if (unlikely(request->rq_early_count)) {
2014 DEBUG_REQ(D_ADAPTTO, request,
2015 "sent %d early replies before finishing in "
2017 request->rq_early_count,
2018 cfs_time_sub(work_end.tv_sec,
2019 request->rq_arrival_time.tv_sec));
2023 ptlrpc_server_finish_active_request(svcpt, request);
2029 * An internal function to process a single reply state object.
2032 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2034 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2035 struct ptlrpc_service *svc = svcpt->scp_service;
2036 struct obd_export *exp;
2040 exp = rs->rs_export;
2042 LASSERT(rs->rs_difficult);
2043 LASSERT(rs->rs_scheduled);
2044 LASSERT(list_empty(&rs->rs_list));
2046 spin_lock(&exp->exp_lock);
2047 /* Noop if removed already */
2048 list_del_init(&rs->rs_exp_list);
2049 spin_unlock(&exp->exp_lock);
2051 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2052 * iterates over newly committed replies, removing them from
2053 * exp_uncommitted_replies. It then drops this lock and schedules the
2054 * replies it found for handling here.
2056 * We can avoid contention for exp_uncommitted_replies_lock between the
2057 * HRT threads and further commit callbacks by checking rs_committed
2058 * which is set in the commit callback while it holds both
2059 * rs_lock and exp_uncommitted_reples.
2061 * If we see rs_committed clear, the commit callback _may_ not have
2062 * handled this reply yet and we race with it to grab
2063 * exp_uncommitted_replies_lock before removing the reply from
2064 * exp_uncommitted_replies. Note that if we lose the race and the
2065 * reply has already been removed, list_del_init() is a noop.
2067 * If we see rs_committed set, we know the commit callback is handling,
2068 * or has handled this reply since store reordering might allow us to
2069 * see rs_committed set out of sequence. But since this is done
2070 * holding rs_lock, we can be sure it has all completed once we hold
2071 * rs_lock, which we do right next.
2073 if (!rs->rs_committed) {
2074 spin_lock(&exp->exp_uncommitted_replies_lock);
2075 list_del_init(&rs->rs_obd_list);
2076 spin_unlock(&exp->exp_uncommitted_replies_lock);
2079 spin_lock(&rs->rs_lock);
2081 been_handled = rs->rs_handled;
2084 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2085 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2087 if (nlocks == 0 && !been_handled) {
2088 /* If we see this, we should already have seen the warning
2089 * in mds_steal_ack_locks() */
2090 CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
2092 rs->rs_xid, rs->rs_transno, rs->rs_opc,
2093 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2096 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2097 spin_unlock(&rs->rs_lock);
2099 if (!been_handled && rs->rs_on_net) {
2100 LNetMDUnlink(rs->rs_md_h);
2101 /* Ignore return code; we're racing with completion */
2104 while (nlocks-- > 0)
2105 ldlm_lock_decref(&rs->rs_locks[nlocks],
2106 rs->rs_modes[nlocks]);
2108 spin_lock(&rs->rs_lock);
2111 rs->rs_scheduled = 0;
2113 if (!rs->rs_on_net) {
2115 spin_unlock(&rs->rs_lock);
2117 class_export_put(exp);
2118 rs->rs_export = NULL;
2119 ptlrpc_rs_decref(rs);
2120 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2121 svc->srv_is_stopping)
2122 wake_up_all(&svcpt->scp_waitq);
2126 /* still on the net; callback will schedule */
2127 spin_unlock(&rs->rs_lock);
2133 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2135 int avail = svcpt->scp_nrqbds_posted;
2136 int low_water = test_req_buffer_pressure ? 0 :
2137 svcpt->scp_service->srv_nbuf_per_group / 2;
2139 /* NB I'm not locking; just looking. */
2141 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2142 * allowed the request history to grow out of control. We could put a
2143 * sanity check on that here and cull some history if we need the
2146 if (avail <= low_water)
2147 ptlrpc_grow_req_bufs(svcpt, 1);
2149 if (svcpt->scp_service->srv_stats) {
2150 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2151 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2156 ptlrpc_retry_rqbds(void *arg)
2158 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2160 svcpt->scp_rqbd_timeout = 0;
2165 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2167 return svcpt->scp_nreqs_active <
2168 svcpt->scp_nthrs_running - 1 -
2169 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2173 * allowed to create more threads
2174 * user can call it w/o any lock but need to hold
2175 * ptlrpc_service_part::scp_lock to get reliable result
2178 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2180 return svcpt->scp_nthrs_running +
2181 svcpt->scp_nthrs_starting <
2182 svcpt->scp_service->srv_nthrs_cpt_limit;
2186 * too many requests and allowed to create more threads
2189 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2191 return !ptlrpc_threads_enough(svcpt) &&
2192 ptlrpc_threads_increasable(svcpt);
2196 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2198 return thread_is_stopping(thread) ||
2199 thread->t_svcpt->scp_service->srv_is_stopping;
2203 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2205 return !list_empty(&svcpt->scp_rqbd_idle) &&
2206 svcpt->scp_rqbd_timeout == 0;
2210 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2212 return svcpt->scp_at_check;
2216 * requests wait on preprocessing
2217 * user can call it w/o any lock but need to hold
2218 * ptlrpc_service_part::scp_lock to get reliable result
2221 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2223 return !list_empty(&svcpt->scp_req_incoming);
2226 static __attribute__((__noinline__)) int
2227 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2228 struct ptlrpc_thread *thread)
2230 /* Don't exit while there are replies to be handled */
2231 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2232 ptlrpc_retry_rqbds, svcpt);
2234 /* XXX: Add this back when libcfs watchdog is merged upstream
2235 lc_watchdog_disable(thread->t_watchdog);
2240 l_wait_event_exclusive_head(svcpt->scp_waitq,
2241 ptlrpc_thread_stopping(thread) ||
2242 ptlrpc_server_request_incoming(svcpt) ||
2243 ptlrpc_server_request_pending(svcpt, false) ||
2244 ptlrpc_rqbd_pending(svcpt) ||
2245 ptlrpc_at_check(svcpt), &lwi);
2247 if (ptlrpc_thread_stopping(thread))
2251 lc_watchdog_touch(thread->t_watchdog,
2252 ptlrpc_server_get_timeout(svcpt));
2258 * Main thread body for service threads.
2259 * Waits in a loop waiting for new requests to process to appear.
2260 * Every time an incoming requests is added to its queue, a waitq
2261 * is woken up and one of the threads will handle it.
2263 static int ptlrpc_main(void *arg)
2265 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2266 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2267 struct ptlrpc_service *svc = svcpt->scp_service;
2268 struct ptlrpc_reply_state *rs;
2269 struct group_info *ginfo = NULL;
2271 int counter = 0, rc = 0;
2273 thread->t_pid = current_pid();
2274 unshare_fs_struct();
2276 /* NB: we will call cfs_cpt_bind() for all threads, because we
2277 * might want to run lustre server only on a subset of system CPUs,
2278 * in that case ->scp_cpt is CFS_CPT_ANY */
2279 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2281 CWARN("%s: failed to bind %s on CPT %d\n",
2282 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2285 ginfo = groups_alloc(0);
2291 set_current_groups(ginfo);
2292 put_group_info(ginfo);
2294 if (svc->srv_ops.so_thr_init != NULL) {
2295 rc = svc->srv_ops.so_thr_init(thread);
2300 env = kzalloc(sizeof(*env), GFP_NOFS);
2306 rc = lu_context_init(&env->le_ctx,
2307 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2311 thread->t_env = env;
2312 env->le_ctx.lc_thread = thread;
2313 env->le_ctx.lc_cookie = 0x6;
2315 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2316 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2320 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2321 svc->srv_name, svcpt->scp_cpt, rc);
2325 /* Alloc reply state structure for this one */
2326 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2332 spin_lock(&svcpt->scp_lock);
2334 LASSERT(thread_is_starting(thread));
2335 thread_clear_flags(thread, SVC_STARTING);
2337 LASSERT(svcpt->scp_nthrs_starting == 1);
2338 svcpt->scp_nthrs_starting--;
2340 /* SVC_STOPPING may already be set here if someone else is trying
2341 * to stop the service while this new thread has been dynamically
2342 * forked. We still set SVC_RUNNING to let our creator know that
2343 * we are now running, however we will exit as soon as possible */
2344 thread_add_flags(thread, SVC_RUNNING);
2345 svcpt->scp_nthrs_running++;
2346 spin_unlock(&svcpt->scp_lock);
2348 /* wake up our creator in case he's still waiting. */
2349 wake_up(&thread->t_ctl_waitq);
2352 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2356 spin_lock(&svcpt->scp_rep_lock);
2357 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2358 wake_up(&svcpt->scp_rep_waitq);
2359 spin_unlock(&svcpt->scp_rep_lock);
2361 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2362 svcpt->scp_nthrs_running);
2364 /* XXX maintain a list of all managed devices: insert here */
2365 while (!ptlrpc_thread_stopping(thread)) {
2366 if (ptlrpc_wait_event(svcpt, thread))
2369 ptlrpc_check_rqbd_pool(svcpt);
2371 if (ptlrpc_threads_need_create(svcpt)) {
2372 /* Ignore return code - we tried... */
2373 ptlrpc_start_thread(svcpt, 0);
2376 /* Process all incoming reqs before handling any */
2377 if (ptlrpc_server_request_incoming(svcpt)) {
2378 lu_context_enter(&env->le_ctx);
2380 ptlrpc_server_handle_req_in(svcpt, thread);
2381 lu_context_exit(&env->le_ctx);
2383 /* but limit ourselves in case of flood */
2384 if (counter++ < 100)
2389 if (ptlrpc_at_check(svcpt))
2390 ptlrpc_at_check_timed(svcpt);
2392 if (ptlrpc_server_request_pending(svcpt, false)) {
2393 lu_context_enter(&env->le_ctx);
2394 ptlrpc_server_handle_request(svcpt, thread);
2395 lu_context_exit(&env->le_ctx);
2398 if (ptlrpc_rqbd_pending(svcpt) &&
2399 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2400 /* I just failed to repost request buffers.
2401 * Wait for a timeout (unless something else
2402 * happens) before I try again */
2403 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2404 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2405 svcpt->scp_nrqbds_posted);
2410 lc_watchdog_delete(thread->t_watchdog);
2411 thread->t_watchdog = NULL;
2416 * deconstruct service specific state created by ptlrpc_start_thread()
2418 if (svc->srv_ops.so_thr_done != NULL)
2419 svc->srv_ops.so_thr_done(thread);
2422 lu_context_fini(&env->le_ctx);
2426 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2427 thread, thread->t_pid, thread->t_id, rc);
2429 spin_lock(&svcpt->scp_lock);
2430 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2431 svcpt->scp_nthrs_starting--;
2433 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2434 /* must know immediately */
2435 svcpt->scp_nthrs_running--;
2439 thread_add_flags(thread, SVC_STOPPED);
2441 wake_up(&thread->t_ctl_waitq);
2442 spin_unlock(&svcpt->scp_lock);
2447 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2448 struct list_head *replies)
2452 spin_lock(&hrt->hrt_lock);
2454 list_splice_init(&hrt->hrt_queue, replies);
2455 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2457 spin_unlock(&hrt->hrt_lock);
2462 * Main body of "handle reply" function.
2463 * It processes acked reply states
2465 static int ptlrpc_hr_main(void *arg)
2467 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2468 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2469 LIST_HEAD (replies);
2470 char threadname[20];
2473 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2474 hrp->hrp_cpt, hrt->hrt_id);
2475 unshare_fs_struct();
2477 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2479 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2480 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2483 atomic_inc(&hrp->hrp_nstarted);
2484 wake_up(&ptlrpc_hr.hr_waitq);
2486 while (!ptlrpc_hr.hr_stopping) {
2487 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2489 while (!list_empty(&replies)) {
2490 struct ptlrpc_reply_state *rs;
2492 rs = list_entry(replies.prev,
2493 struct ptlrpc_reply_state,
2495 list_del_init(&rs->rs_list);
2496 ptlrpc_handle_rs(rs);
2500 atomic_inc(&hrp->hrp_nstopped);
2501 wake_up(&ptlrpc_hr.hr_waitq);
2506 static void ptlrpc_stop_hr_threads(void)
2508 struct ptlrpc_hr_partition *hrp;
2512 ptlrpc_hr.hr_stopping = 1;
2514 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2515 if (hrp->hrp_thrs == NULL)
2516 continue; /* uninitialized */
2517 for (j = 0; j < hrp->hrp_nthrs; j++)
2518 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2521 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2522 if (hrp->hrp_thrs == NULL)
2523 continue; /* uninitialized */
2524 wait_event(ptlrpc_hr.hr_waitq,
2525 atomic_read(&hrp->hrp_nstopped) ==
2526 atomic_read(&hrp->hrp_nstarted));
2530 static int ptlrpc_start_hr_threads(void)
2532 struct ptlrpc_hr_partition *hrp;
2536 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2539 for (j = 0; j < hrp->hrp_nthrs; j++) {
2540 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2541 rc = PTR_ERR(kthread_run(ptlrpc_hr_main,
2543 "ptlrpc_hr%02d_%03d",
2546 if (IS_ERR_VALUE(rc))
2549 wait_event(ptlrpc_hr.hr_waitq,
2550 atomic_read(&hrp->hrp_nstarted) == j);
2551 if (!IS_ERR_VALUE(rc))
2554 CERROR("Reply handling thread %d:%d Failed on starting: rc = %d\n",
2556 ptlrpc_stop_hr_threads();
2562 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2564 struct l_wait_info lwi = { 0 };
2565 struct ptlrpc_thread *thread;
2568 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2569 svcpt->scp_service->srv_name);
2571 spin_lock(&svcpt->scp_lock);
2572 /* let the thread know that we would like it to stop asap */
2573 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2574 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2575 svcpt->scp_service->srv_thread_name, thread->t_id);
2576 thread_add_flags(thread, SVC_STOPPING);
2579 wake_up_all(&svcpt->scp_waitq);
2581 while (!list_empty(&svcpt->scp_threads)) {
2582 thread = list_entry(svcpt->scp_threads.next,
2583 struct ptlrpc_thread, t_link);
2584 if (thread_is_stopped(thread)) {
2585 list_del(&thread->t_link);
2586 list_add(&thread->t_link, &zombie);
2589 spin_unlock(&svcpt->scp_lock);
2591 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2592 svcpt->scp_service->srv_thread_name, thread->t_id);
2593 l_wait_event(thread->t_ctl_waitq,
2594 thread_is_stopped(thread), &lwi);
2596 spin_lock(&svcpt->scp_lock);
2599 spin_unlock(&svcpt->scp_lock);
2601 while (!list_empty(&zombie)) {
2602 thread = list_entry(zombie.next,
2603 struct ptlrpc_thread, t_link);
2604 list_del(&thread->t_link);
2610 * Stops all threads of a particular service \a svc
2612 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2614 struct ptlrpc_service_part *svcpt;
2617 ptlrpc_service_for_each_part(svcpt, i, svc) {
2618 if (svcpt->scp_service != NULL)
2619 ptlrpc_svcpt_stop_threads(svcpt);
2622 EXPORT_SYMBOL(ptlrpc_stop_all_threads);
2624 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2630 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2631 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2633 for (i = 0; i < svc->srv_ncpts; i++) {
2634 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2635 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2641 /* We have enough threads, don't start more. b=15759 */
2648 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2649 svc->srv_thread_name, i, j, rc);
2650 ptlrpc_stop_all_threads(svc);
2653 EXPORT_SYMBOL(ptlrpc_start_threads);
2655 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2657 struct l_wait_info lwi = { 0 };
2658 struct ptlrpc_thread *thread;
2659 struct ptlrpc_service *svc;
2662 LASSERT(svcpt != NULL);
2664 svc = svcpt->scp_service;
2666 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2667 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2668 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2671 if (unlikely(svc->srv_is_stopping))
2674 if (!ptlrpc_threads_increasable(svcpt) ||
2675 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2676 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2679 thread = kzalloc_node(sizeof(*thread), GFP_NOFS,
2680 cfs_cpt_spread_node(svc->srv_cptable,
2684 init_waitqueue_head(&thread->t_ctl_waitq);
2686 spin_lock(&svcpt->scp_lock);
2687 if (!ptlrpc_threads_increasable(svcpt)) {
2688 spin_unlock(&svcpt->scp_lock);
2693 if (svcpt->scp_nthrs_starting != 0) {
2694 /* serialize starting because some modules (obdfilter)
2695 * might require unique and contiguous t_id */
2696 LASSERT(svcpt->scp_nthrs_starting == 1);
2697 spin_unlock(&svcpt->scp_lock);
2700 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2701 svc->srv_thread_name, svcpt->scp_thr_nextid);
2706 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2707 svc->srv_thread_name, svcpt->scp_thr_nextid);
2711 svcpt->scp_nthrs_starting++;
2712 thread->t_id = svcpt->scp_thr_nextid++;
2713 thread_add_flags(thread, SVC_STARTING);
2714 thread->t_svcpt = svcpt;
2716 list_add(&thread->t_link, &svcpt->scp_threads);
2717 spin_unlock(&svcpt->scp_lock);
2719 if (svcpt->scp_cpt >= 0) {
2720 snprintf(thread->t_name, sizeof(thread->t_name), "%s%02d_%03d",
2721 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2723 snprintf(thread->t_name, sizeof(thread->t_name), "%s_%04d",
2724 svc->srv_thread_name, thread->t_id);
2727 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2728 rc = PTR_ERR(kthread_run(ptlrpc_main, thread, "%s", thread->t_name));
2729 if (IS_ERR_VALUE(rc)) {
2730 CERROR("cannot start thread '%s': rc %d\n",
2731 thread->t_name, rc);
2732 spin_lock(&svcpt->scp_lock);
2733 --svcpt->scp_nthrs_starting;
2734 if (thread_is_stopping(thread)) {
2735 /* this ptlrpc_thread is being handled
2736 * by ptlrpc_svcpt_stop_threads now
2738 thread_add_flags(thread, SVC_STOPPED);
2739 wake_up(&thread->t_ctl_waitq);
2740 spin_unlock(&svcpt->scp_lock);
2742 list_del(&thread->t_link);
2743 spin_unlock(&svcpt->scp_lock);
2752 l_wait_event(thread->t_ctl_waitq,
2753 thread_is_running(thread) || thread_is_stopped(thread),
2756 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2760 int ptlrpc_hr_init(void)
2762 struct ptlrpc_hr_partition *hrp;
2763 struct ptlrpc_hr_thread *hrt;
2769 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2770 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2772 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2774 if (ptlrpc_hr.hr_partitions == NULL)
2777 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2779 weight = cpumask_weight(topology_thread_cpumask(0));
2781 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2784 atomic_set(&hrp->hrp_nstarted, 0);
2785 atomic_set(&hrp->hrp_nstopped, 0);
2787 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
2788 hrp->hrp_nthrs /= weight;
2790 LASSERT(hrp->hrp_nthrs > 0);
2792 kzalloc_node(hrp->hrp_nthrs * sizeof(*hrt), GFP_NOFS,
2793 cfs_cpt_spread_node(ptlrpc_hr.hr_cpt_table,
2795 if (hrp->hrp_thrs == NULL) {
2800 for (j = 0; j < hrp->hrp_nthrs; j++) {
2801 hrt = &hrp->hrp_thrs[j];
2804 hrt->hrt_partition = hrp;
2805 init_waitqueue_head(&hrt->hrt_waitq);
2806 spin_lock_init(&hrt->hrt_lock);
2807 INIT_LIST_HEAD(&hrt->hrt_queue);
2811 rc = ptlrpc_start_hr_threads();
2818 void ptlrpc_hr_fini(void)
2820 struct ptlrpc_hr_partition *hrp;
2823 if (ptlrpc_hr.hr_partitions == NULL)
2826 ptlrpc_stop_hr_threads();
2828 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2829 if (hrp->hrp_thrs != NULL) {
2830 kfree(hrp->hrp_thrs);
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 request buffers\n",
2919 svcpt->scp_service->srv_name);
2921 spin_lock(&svcpt->scp_lock);
2923 spin_unlock(&svcpt->scp_lock);
2928 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
2930 struct ptlrpc_service_part *svcpt;
2931 struct ptlrpc_request_buffer_desc *rqbd;
2932 struct ptlrpc_request *req;
2933 struct ptlrpc_reply_state *rs;
2936 ptlrpc_service_for_each_part(svcpt, i, svc) {
2937 if (svcpt->scp_service == NULL)
2940 spin_lock(&svcpt->scp_rep_lock);
2941 while (!list_empty(&svcpt->scp_rep_active)) {
2942 rs = list_entry(svcpt->scp_rep_active.next,
2943 struct ptlrpc_reply_state, rs_list);
2944 spin_lock(&rs->rs_lock);
2945 ptlrpc_schedule_difficult_reply(rs);
2946 spin_unlock(&rs->rs_lock);
2948 spin_unlock(&svcpt->scp_rep_lock);
2950 /* purge the request queue. NB No new replies (rqbds
2951 * all unlinked) and no service threads, so I'm the only
2952 * thread noodling the request queue now */
2953 while (!list_empty(&svcpt->scp_req_incoming)) {
2954 req = list_entry(svcpt->scp_req_incoming.next,
2955 struct ptlrpc_request, rq_list);
2957 list_del(&req->rq_list);
2958 svcpt->scp_nreqs_incoming--;
2959 ptlrpc_server_finish_request(svcpt, req);
2962 while (ptlrpc_server_request_pending(svcpt, true)) {
2963 req = ptlrpc_server_request_get(svcpt, true);
2964 ptlrpc_server_finish_active_request(svcpt, req);
2967 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
2968 LASSERT(svcpt->scp_nreqs_incoming == 0);
2969 LASSERT(svcpt->scp_nreqs_active == 0);
2970 /* history should have been culled by
2971 * ptlrpc_server_finish_request */
2972 LASSERT(svcpt->scp_hist_nrqbds == 0);
2974 /* Now free all the request buffers since nothing
2975 * references them any more... */
2977 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2978 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
2979 struct ptlrpc_request_buffer_desc,
2981 ptlrpc_free_rqbd(rqbd);
2983 ptlrpc_wait_replies(svcpt);
2985 while (!list_empty(&svcpt->scp_rep_idle)) {
2986 rs = list_entry(svcpt->scp_rep_idle.next,
2987 struct ptlrpc_reply_state,
2989 list_del(&rs->rs_list);
2990 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
2996 ptlrpc_service_free(struct ptlrpc_service *svc)
2998 struct ptlrpc_service_part *svcpt;
2999 struct ptlrpc_at_array *array;
3002 ptlrpc_service_for_each_part(svcpt, i, svc) {
3003 if (svcpt->scp_service == NULL)
3006 /* In case somebody rearmed this in the meantime */
3007 cfs_timer_disarm(&svcpt->scp_at_timer);
3008 array = &svcpt->scp_at_array;
3010 kfree(array->paa_reqs_array);
3011 array->paa_reqs_array = NULL;
3012 kfree(array->paa_reqs_count);
3013 array->paa_reqs_count = NULL;
3016 ptlrpc_service_for_each_part(svcpt, i, svc)
3019 if (svc->srv_cpts != NULL)
3020 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3025 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3027 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3029 service->srv_is_stopping = 1;
3031 mutex_lock(&ptlrpc_all_services_mutex);
3032 list_del_init(&service->srv_list);
3033 mutex_unlock(&ptlrpc_all_services_mutex);
3035 ptlrpc_service_del_atimer(service);
3036 ptlrpc_stop_all_threads(service);
3038 ptlrpc_service_unlink_rqbd(service);
3039 ptlrpc_service_purge_all(service);
3040 ptlrpc_service_nrs_cleanup(service);
3042 ptlrpc_lprocfs_unregister_service(service);
3043 ptlrpc_sysfs_unregister_service(service);
3045 ptlrpc_service_free(service);
3049 EXPORT_SYMBOL(ptlrpc_unregister_service);
3052 * Returns 0 if the service is healthy.
3054 * Right now, it just checks to make sure that requests aren't languishing
3055 * in the queue. We'll use this health check to govern whether a node needs
3056 * to be shot, so it's intentionally non-aggressive. */
3057 int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3059 struct ptlrpc_request *request = NULL;
3060 struct timeval right_now;
3063 do_gettimeofday(&right_now);
3065 spin_lock(&svcpt->scp_req_lock);
3066 /* How long has the next entry been waiting? */
3067 if (ptlrpc_server_high_pending(svcpt, true))
3068 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3069 else if (ptlrpc_server_normal_pending(svcpt, true))
3070 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3072 if (request == NULL) {
3073 spin_unlock(&svcpt->scp_req_lock);
3077 timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
3078 spin_unlock(&svcpt->scp_req_lock);
3080 if ((timediff / ONE_MILLION) >
3081 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3082 CERROR("%s: unhealthy - request has been waiting %lds\n",
3083 svcpt->scp_service->srv_name, timediff / ONE_MILLION);
3091 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3093 struct ptlrpc_service_part *svcpt;
3099 ptlrpc_service_for_each_part(svcpt, i, svc) {
3100 int rc = ptlrpc_svcpt_health_check(svcpt);
3107 EXPORT_SYMBOL(ptlrpc_service_health_check);