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
39 #include <liblustre.h>
41 #include <obd_support.h>
42 #include <obd_class.h>
43 #include <lustre_net.h>
44 #include <lu_object.h>
45 #include <lnet/types.h>
46 #include "ptlrpc_internal.h"
48 /* The following are visible and mutable through /sys/module/ptlrpc */
49 int test_req_buffer_pressure = 0;
50 CFS_MODULE_PARM(test_req_buffer_pressure, "i", int, 0444,
51 "set non-zero to put pressure on request buffer pools");
52 CFS_MODULE_PARM(at_min, "i", int, 0644,
53 "Adaptive timeout minimum (sec)");
54 CFS_MODULE_PARM(at_max, "i", int, 0644,
55 "Adaptive timeout maximum (sec)");
56 CFS_MODULE_PARM(at_history, "i", int, 0644,
57 "Adaptive timeouts remember the slowest event that took place "
58 "within this period (sec)");
59 CFS_MODULE_PARM(at_early_margin, "i", int, 0644,
60 "How soon before an RPC deadline to send an early reply");
61 CFS_MODULE_PARM(at_extra, "i", int, 0644,
62 "How much extra time to give with each early reply");
66 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt);
67 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req);
68 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req);
70 /** Holds a list of all PTLRPC services */
71 CFS_LIST_HEAD(ptlrpc_all_services);
72 /** Used to protect the \e ptlrpc_all_services list */
73 struct mutex ptlrpc_all_services_mutex;
75 struct ptlrpc_request_buffer_desc *
76 ptlrpc_alloc_rqbd(struct ptlrpc_service_part *svcpt)
78 struct ptlrpc_service *svc = svcpt->scp_service;
79 struct ptlrpc_request_buffer_desc *rqbd;
81 OBD_CPT_ALLOC_PTR(rqbd, svc->srv_cptable, svcpt->scp_cpt);
85 rqbd->rqbd_svcpt = svcpt;
86 rqbd->rqbd_refcount = 0;
87 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
88 rqbd->rqbd_cbid.cbid_arg = rqbd;
89 CFS_INIT_LIST_HEAD(&rqbd->rqbd_reqs);
90 OBD_CPT_ALLOC_LARGE(rqbd->rqbd_buffer, svc->srv_cptable,
91 svcpt->scp_cpt, svc->srv_buf_size);
92 if (rqbd->rqbd_buffer == NULL) {
97 spin_lock(&svcpt->scp_lock);
98 cfs_list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
99 svcpt->scp_nrqbds_total++;
100 spin_unlock(&svcpt->scp_lock);
106 ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
108 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
110 LASSERT(rqbd->rqbd_refcount == 0);
111 LASSERT(cfs_list_empty(&rqbd->rqbd_reqs));
113 spin_lock(&svcpt->scp_lock);
114 cfs_list_del(&rqbd->rqbd_list);
115 svcpt->scp_nrqbds_total--;
116 spin_unlock(&svcpt->scp_lock);
118 OBD_FREE_LARGE(rqbd->rqbd_buffer, svcpt->scp_service->srv_buf_size);
123 ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
125 struct ptlrpc_service *svc = svcpt->scp_service;
126 struct ptlrpc_request_buffer_desc *rqbd;
130 if (svcpt->scp_rqbd_allocating)
133 spin_lock(&svcpt->scp_lock);
134 /* check again with lock */
135 if (svcpt->scp_rqbd_allocating) {
136 /* NB: we might allow more than one thread in the future */
137 LASSERT(svcpt->scp_rqbd_allocating == 1);
138 spin_unlock(&svcpt->scp_lock);
142 svcpt->scp_rqbd_allocating++;
143 spin_unlock(&svcpt->scp_lock);
146 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
147 /* NB: another thread might have recycled enough rqbds, we
148 * need to make sure it wouldn't over-allocate, see LU-1212. */
149 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group)
152 rqbd = ptlrpc_alloc_rqbd(svcpt);
155 CERROR("%s: Can't allocate request buffer\n",
162 spin_lock(&svcpt->scp_lock);
164 LASSERT(svcpt->scp_rqbd_allocating == 1);
165 svcpt->scp_rqbd_allocating--;
167 spin_unlock(&svcpt->scp_lock);
170 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
171 svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted,
172 svcpt->scp_nrqbds_total, rc);
176 rc = ptlrpc_server_post_idle_rqbds(svcpt);
182 * Part of Rep-Ack logic.
183 * Puts a lock and its mode into reply state assotiated to request reply.
186 ptlrpc_save_lock(struct ptlrpc_request *req,
187 struct lustre_handle *lock, int mode, int no_ack)
189 struct ptlrpc_reply_state *rs = req->rq_reply_state;
193 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
195 if (req->rq_export->exp_disconnected) {
196 ldlm_lock_decref(lock, mode);
198 idx = rs->rs_nlocks++;
199 rs->rs_locks[idx] = *lock;
200 rs->rs_modes[idx] = mode;
201 rs->rs_difficult = 1;
202 rs->rs_no_ack = !!no_ack;
205 EXPORT_SYMBOL(ptlrpc_save_lock);
209 struct ptlrpc_hr_partition;
211 struct ptlrpc_hr_thread {
212 int hrt_id; /* thread ID */
214 cfs_waitq_t hrt_waitq;
215 cfs_list_t hrt_queue; /* RS queue */
216 struct ptlrpc_hr_partition *hrt_partition;
219 struct ptlrpc_hr_partition {
220 /* # of started threads */
221 cfs_atomic_t hrp_nstarted;
222 /* # of stopped threads */
223 cfs_atomic_t hrp_nstopped;
224 /* cpu partition id */
226 /* round-robin rotor for choosing thread */
228 /* total number of threads on this partition */
231 struct ptlrpc_hr_thread *hrp_thrs;
234 #define HRT_RUNNING 0
235 #define HRT_STOPPING 1
237 struct ptlrpc_hr_service {
238 /* CPU partition table, it's just cfs_cpt_table for now */
239 struct cfs_cpt_table *hr_cpt_table;
240 /** controller sleep waitq */
241 cfs_waitq_t hr_waitq;
242 unsigned int hr_stopping;
243 /** roundrobin rotor for non-affinity service */
244 unsigned int hr_rotor;
246 struct ptlrpc_hr_partition **hr_partitions;
250 cfs_list_t rsb_replies;
251 unsigned int rsb_n_replies;
252 struct ptlrpc_service_part *rsb_svcpt;
255 /** reply handling service. */
256 static struct ptlrpc_hr_service ptlrpc_hr;
259 * maximum mumber of replies scheduled in one batch
261 #define MAX_SCHEDULED 256
264 * Initialize a reply batch.
268 static void rs_batch_init(struct rs_batch *b)
270 memset(b, 0, sizeof *b);
271 CFS_INIT_LIST_HEAD(&b->rsb_replies);
275 * Choose an hr thread to dispatch requests to.
277 static struct ptlrpc_hr_thread *
278 ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
280 struct ptlrpc_hr_partition *hrp;
283 if (svcpt->scp_cpt >= 0 &&
284 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
285 /* directly match partition */
286 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
289 rotor = ptlrpc_hr.hr_rotor++;
290 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
292 hrp = ptlrpc_hr.hr_partitions[rotor];
295 rotor = hrp->hrp_rotor++;
296 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
300 * Dispatch all replies accumulated in the batch to one from
301 * dedicated reply handling threads.
305 static void rs_batch_dispatch(struct rs_batch *b)
307 if (b->rsb_n_replies != 0) {
308 struct ptlrpc_hr_thread *hrt;
310 hrt = ptlrpc_hr_select(b->rsb_svcpt);
312 spin_lock(&hrt->hrt_lock);
313 cfs_list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
314 spin_unlock(&hrt->hrt_lock);
316 cfs_waitq_signal(&hrt->hrt_waitq);
317 b->rsb_n_replies = 0;
322 * Add a reply to a batch.
323 * Add one reply object to a batch, schedule batched replies if overload.
328 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
330 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
332 if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
333 if (b->rsb_svcpt != NULL) {
334 rs_batch_dispatch(b);
335 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
337 spin_lock(&svcpt->scp_rep_lock);
338 b->rsb_svcpt = svcpt;
340 spin_lock(&rs->rs_lock);
341 rs->rs_scheduled_ever = 1;
342 if (rs->rs_scheduled == 0) {
343 cfs_list_move(&rs->rs_list, &b->rsb_replies);
344 rs->rs_scheduled = 1;
347 rs->rs_committed = 1;
348 spin_unlock(&rs->rs_lock);
352 * Reply batch finalization.
353 * Dispatch remaining replies from the batch
354 * and release remaining spinlock.
358 static void rs_batch_fini(struct rs_batch *b)
360 if (b->rsb_svcpt != NULL) {
361 rs_batch_dispatch(b);
362 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
366 #define DECLARE_RS_BATCH(b) struct rs_batch b
368 #else /* __KERNEL__ */
370 #define rs_batch_init(b) do{}while(0)
371 #define rs_batch_fini(b) do{}while(0)
372 #define rs_batch_add(b, r) ptlrpc_schedule_difficult_reply(r)
373 #define DECLARE_RS_BATCH(b)
375 #endif /* __KERNEL__ */
378 * Put reply state into a queue for processing because we received
379 * ACK from the client
381 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
384 struct ptlrpc_hr_thread *hrt;
387 LASSERT(cfs_list_empty(&rs->rs_list));
389 hrt = ptlrpc_hr_select(rs->rs_svcpt);
391 spin_lock(&hrt->hrt_lock);
392 cfs_list_add_tail(&rs->rs_list, &hrt->hrt_queue);
393 spin_unlock(&hrt->hrt_lock);
395 cfs_waitq_signal(&hrt->hrt_waitq);
398 cfs_list_add_tail(&rs->rs_list, &rs->rs_svcpt->scp_rep_queue);
403 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
407 LASSERT_SPIN_LOCKED(&rs->rs_svcpt->scp_rep_lock);
408 LASSERT_SPIN_LOCKED(&rs->rs_lock);
409 LASSERT (rs->rs_difficult);
410 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
412 if (rs->rs_scheduled) { /* being set up or already notified */
417 rs->rs_scheduled = 1;
418 cfs_list_del_init(&rs->rs_list);
419 ptlrpc_dispatch_difficult_reply(rs);
422 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
424 void ptlrpc_commit_replies(struct obd_export *exp)
426 struct ptlrpc_reply_state *rs, *nxt;
427 DECLARE_RS_BATCH(batch);
430 rs_batch_init(&batch);
431 /* Find any replies that have been committed and get their service
432 * to attend to complete them. */
434 /* CAVEAT EMPTOR: spinlock ordering!!! */
435 spin_lock(&exp->exp_uncommitted_replies_lock);
436 cfs_list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
438 LASSERT (rs->rs_difficult);
439 /* VBR: per-export last_committed */
440 LASSERT(rs->rs_export);
441 if (rs->rs_transno <= exp->exp_last_committed) {
442 cfs_list_del_init(&rs->rs_obd_list);
443 rs_batch_add(&batch, rs);
446 spin_unlock(&exp->exp_uncommitted_replies_lock);
447 rs_batch_fini(&batch);
450 EXPORT_SYMBOL(ptlrpc_commit_replies);
453 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
455 struct ptlrpc_request_buffer_desc *rqbd;
460 spin_lock(&svcpt->scp_lock);
462 if (cfs_list_empty(&svcpt->scp_rqbd_idle)) {
463 spin_unlock(&svcpt->scp_lock);
467 rqbd = cfs_list_entry(svcpt->scp_rqbd_idle.next,
468 struct ptlrpc_request_buffer_desc,
470 cfs_list_del(&rqbd->rqbd_list);
472 /* assume we will post successfully */
473 svcpt->scp_nrqbds_posted++;
474 cfs_list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
476 spin_unlock(&svcpt->scp_lock);
478 rc = ptlrpc_register_rqbd(rqbd);
485 spin_lock(&svcpt->scp_lock);
487 svcpt->scp_nrqbds_posted--;
488 cfs_list_del(&rqbd->rqbd_list);
489 cfs_list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
491 /* Don't complain if no request buffers are posted right now; LNET
492 * won't drop requests because we set the portal lazy! */
494 spin_unlock(&svcpt->scp_lock);
499 static void ptlrpc_at_timer(unsigned long castmeharder)
501 struct ptlrpc_service_part *svcpt;
503 svcpt = (struct ptlrpc_service_part *)castmeharder;
505 svcpt->scp_at_check = 1;
506 svcpt->scp_at_checktime = cfs_time_current();
507 cfs_waitq_signal(&svcpt->scp_waitq);
511 ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
512 struct ptlrpc_service_conf *conf)
515 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
522 * Common code for estimating & validating threads number.
523 * CPT affinity service could have percpt thread-pool instead
524 * of a global thread-pool, which means user might not always
525 * get the threads number they give it in conf::tc_nthrs_user
526 * even they did set. It's because we need to validate threads
527 * number for each CPT to guarantee each pool will have enough
528 * threads to keep the service healthy.
530 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
531 init = max_t(int, init, tc->tc_nthrs_init);
533 /* NB: please see comments in lustre_lnet.h for definition
534 * details of these members */
535 LASSERT(tc->tc_nthrs_max != 0);
537 if (tc->tc_nthrs_user != 0) {
538 /* In case there is a reason to test a service with many
539 * threads, we give a less strict check here, it can
540 * be up to 8 * nthrs_max */
541 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
542 nthrs = total / svc->srv_ncpts;
543 init = max(init, nthrs);
547 total = tc->tc_nthrs_max;
548 if (tc->tc_nthrs_base == 0) {
549 /* don't care about base threads number per partition,
550 * this is most for non-affinity service */
551 nthrs = total / svc->srv_ncpts;
555 nthrs = tc->tc_nthrs_base;
556 if (svc->srv_ncpts == 1) {
559 /* NB: Increase the base number if it's single partition
560 * and total number of cores/HTs is larger or equal to 4.
561 * result will always < 2 * nthrs_base */
562 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
563 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
564 (tc->tc_nthrs_base >> i) != 0; i++)
565 nthrs += tc->tc_nthrs_base >> i;
568 if (tc->tc_thr_factor != 0) {
569 int factor = tc->tc_thr_factor;
573 * User wants to increase number of threads with for
574 * each CPU core/HT, most likely the factor is larger then
575 * one thread/core because service threads are supposed to
576 * be blocked by lock or wait for IO.
579 * Amdahl's law says that adding processors wouldn't give
580 * a linear increasing of parallelism, so it's nonsense to
581 * have too many threads no matter how many cores/HTs
584 if (cfs_cpu_ht_nsiblings(0) > 1) { /* weight is # of HTs */
585 /* depress thread factor for hyper-thread */
586 factor = factor - (factor >> 1) + (factor >> 3);
589 weight = cfs_cpt_weight(svc->srv_cptable, 0);
592 for (; factor > 0 && weight > 0; factor--, weight -= fade)
593 nthrs += min(weight, fade) * factor;
596 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
597 nthrs = max(tc->tc_nthrs_base,
598 tc->tc_nthrs_max / svc->srv_ncpts);
601 nthrs = max(nthrs, tc->tc_nthrs_init);
602 svc->srv_nthrs_cpt_limit = nthrs;
603 svc->srv_nthrs_cpt_init = init;
605 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
606 LCONSOLE_WARN("%s: This service may have more threads (%d) "
607 "than the given soft limit (%d)\n",
608 svc->srv_name, nthrs * svc->srv_ncpts,
615 * Initialize percpt data for a service
618 ptlrpc_service_part_init(struct ptlrpc_service *svc,
619 struct ptlrpc_service_part *svcpt, int cpt)
621 struct ptlrpc_at_array *array;
626 svcpt->scp_cpt = cpt;
627 CFS_INIT_LIST_HEAD(&svcpt->scp_threads);
629 /* rqbd and incoming request queue */
630 spin_lock_init(&svcpt->scp_lock);
631 CFS_INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
632 CFS_INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
633 CFS_INIT_LIST_HEAD(&svcpt->scp_req_incoming);
634 cfs_waitq_init(&svcpt->scp_waitq);
635 /* history request & rqbd list */
636 CFS_INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
637 CFS_INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
639 /* acitve requests and hp requests */
640 spin_lock_init(&svcpt->scp_req_lock);
643 spin_lock_init(&svcpt->scp_rep_lock);
644 CFS_INIT_LIST_HEAD(&svcpt->scp_rep_active);
646 CFS_INIT_LIST_HEAD(&svcpt->scp_rep_queue);
648 CFS_INIT_LIST_HEAD(&svcpt->scp_rep_idle);
649 cfs_waitq_init(&svcpt->scp_rep_waitq);
650 cfs_atomic_set(&svcpt->scp_nreps_difficult, 0);
652 /* adaptive timeout */
653 spin_lock_init(&svcpt->scp_at_lock);
654 array = &svcpt->scp_at_array;
656 size = at_est2timeout(at_max);
657 array->paa_size = size;
658 array->paa_count = 0;
659 array->paa_deadline = -1;
661 /* allocate memory for scp_at_array (ptlrpc_at_array) */
662 OBD_CPT_ALLOC(array->paa_reqs_array,
663 svc->srv_cptable, cpt, sizeof(cfs_list_t) * size);
664 if (array->paa_reqs_array == NULL)
667 for (index = 0; index < size; index++)
668 CFS_INIT_LIST_HEAD(&array->paa_reqs_array[index]);
670 OBD_CPT_ALLOC(array->paa_reqs_count,
671 svc->srv_cptable, cpt, sizeof(__u32) * size);
672 if (array->paa_reqs_count == NULL)
675 cfs_timer_init(&svcpt->scp_at_timer, ptlrpc_at_timer, svcpt);
676 /* At SOW, service time should be quick; 10s seems generous. If client
677 * timeout is less than this, we'll be sending an early reply. */
678 at_init(&svcpt->scp_at_estimate, 10, 0);
680 /* assign this before call ptlrpc_grow_req_bufs */
681 svcpt->scp_service = svc;
682 /* Now allocate the request buffers, but don't post them now */
683 rc = ptlrpc_grow_req_bufs(svcpt, 0);
684 /* We shouldn't be under memory pressure at startup, so
685 * fail if we can't allocate all our buffers at this time. */
692 if (array->paa_reqs_count != NULL) {
693 OBD_FREE(array->paa_reqs_count, sizeof(__u32) * size);
694 array->paa_reqs_count = NULL;
697 if (array->paa_reqs_array != NULL) {
698 OBD_FREE(array->paa_reqs_array,
699 sizeof(cfs_list_t) * array->paa_size);
700 array->paa_reqs_array = NULL;
707 * Initialize service on a given portal.
708 * This includes starting serving threads , allocating and posting rqbds and
711 struct ptlrpc_service *
712 ptlrpc_register_service(struct ptlrpc_service_conf *conf,
713 cfs_proc_dir_entry_t *proc_entry)
715 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
716 struct ptlrpc_service *service;
717 struct ptlrpc_service_part *svcpt;
718 struct cfs_cpt_table *cptable;
726 LASSERT(conf->psc_buf.bc_nbufs > 0);
727 LASSERT(conf->psc_buf.bc_buf_size >=
728 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
729 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
731 cptable = cconf->cc_cptable;
733 cptable = cfs_cpt_table;
735 if (!conf->psc_thr.tc_cpu_affinity) {
738 ncpts = cfs_cpt_number(cptable);
739 if (cconf->cc_pattern != NULL) {
740 struct cfs_expr_list *el;
742 rc = cfs_expr_list_parse(cconf->cc_pattern,
743 strlen(cconf->cc_pattern),
746 CERROR("%s: invalid CPT pattern string: %s",
747 conf->psc_name, cconf->cc_pattern);
748 RETURN(ERR_PTR(-EINVAL));
751 rc = cfs_expr_list_values(el, ncpts, &cpts);
752 cfs_expr_list_free(el);
754 CERROR("%s: failed to parse CPT array %s: %d\n",
755 conf->psc_name, cconf->cc_pattern, rc);
757 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
758 RETURN(ERR_PTR(rc < 0 ? rc : -EINVAL));
764 OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
765 if (service == NULL) {
767 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
768 RETURN(ERR_PTR(-ENOMEM));
771 service->srv_cptable = cptable;
772 service->srv_cpts = cpts;
773 service->srv_ncpts = ncpts;
775 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
776 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
777 service->srv_cpt_bits++;
780 spin_lock_init(&service->srv_lock);
781 service->srv_name = conf->psc_name;
782 service->srv_watchdog_factor = conf->psc_watchdog_factor;
783 CFS_INIT_LIST_HEAD(&service->srv_list); /* for safty of cleanup */
785 /* buffer configuration */
786 service->srv_nbuf_per_group = test_req_buffer_pressure ? 1 :
787 max(conf->psc_buf.bc_nbufs /
788 service->srv_ncpts, 1U);
789 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
791 service->srv_buf_size = conf->psc_buf.bc_buf_size;
792 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
793 service->srv_req_portal = conf->psc_buf.bc_req_portal;
795 /* Increase max reply size to next power of two */
796 service->srv_max_reply_size = 1;
797 while (service->srv_max_reply_size <
798 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
799 service->srv_max_reply_size <<= 1;
801 service->srv_thread_name = conf->psc_thr.tc_thr_name;
802 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
803 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
804 service->srv_ops = conf->psc_ops;
806 for (i = 0; i < ncpts; i++) {
807 if (!conf->psc_thr.tc_cpu_affinity)
810 cpt = cpts != NULL ? cpts[i] : i;
812 OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
814 GOTO(failed, rc = -ENOMEM);
816 service->srv_parts[i] = svcpt;
817 rc = ptlrpc_service_part_init(service, svcpt, cpt);
822 ptlrpc_server_nthreads_check(service, conf);
824 rc = LNetSetLazyPortal(service->srv_req_portal);
827 mutex_lock(&ptlrpc_all_services_mutex);
828 cfs_list_add (&service->srv_list, &ptlrpc_all_services);
829 mutex_unlock(&ptlrpc_all_services_mutex);
831 if (proc_entry != NULL)
832 ptlrpc_lprocfs_register_service(proc_entry, service);
834 rc = ptlrpc_service_nrs_setup(service);
838 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
839 service->srv_name, service->srv_req_portal);
842 rc = ptlrpc_start_threads(service);
844 CERROR("Failed to start threads for service %s: %d\n",
845 service->srv_name, rc);
852 ptlrpc_unregister_service(service);
855 EXPORT_SYMBOL(ptlrpc_register_service);
858 * to actually free the request, must be called without holding svc_lock.
859 * note it's caller's responsibility to unlink req->rq_list.
861 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
863 LASSERT(cfs_atomic_read(&req->rq_refcount) == 0);
864 LASSERT(cfs_list_empty(&req->rq_timed_list));
866 /* DEBUG_REQ() assumes the reply state of a request with a valid
867 * ref will not be destroyed until that reference is dropped. */
868 ptlrpc_req_drop_rs(req);
870 sptlrpc_svc_ctx_decref(req);
872 if (req != &req->rq_rqbd->rqbd_req) {
873 /* NB request buffers use an embedded
874 * req if the incoming req unlinked the
875 * MD; this isn't one of them! */
876 OBD_FREE(req, sizeof(*req));
881 * drop a reference count of the request. if it reaches 0, we either
882 * put it into history list, or free it immediately.
884 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
886 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
887 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
888 struct ptlrpc_service *svc = svcpt->scp_service;
893 if (!cfs_atomic_dec_and_test(&req->rq_refcount))
896 if (req->rq_at_linked) {
897 spin_lock(&svcpt->scp_at_lock);
898 /* recheck with lock, in case it's unlinked by
899 * ptlrpc_at_check_timed() */
900 if (likely(req->rq_at_linked))
901 ptlrpc_at_remove_timed(req);
902 spin_unlock(&svcpt->scp_at_lock);
905 LASSERT(cfs_list_empty(&req->rq_timed_list));
907 /* finalize request */
908 if (req->rq_export) {
909 class_export_put(req->rq_export);
910 req->rq_export = NULL;
913 spin_lock(&svcpt->scp_lock);
915 cfs_list_add(&req->rq_list, &rqbd->rqbd_reqs);
917 refcount = --(rqbd->rqbd_refcount);
919 /* request buffer is now idle: add to history */
920 cfs_list_del(&rqbd->rqbd_list);
922 cfs_list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
923 svcpt->scp_hist_nrqbds++;
925 /* cull some history?
926 * I expect only about 1 or 2 rqbds need to be recycled here */
927 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
928 rqbd = cfs_list_entry(svcpt->scp_hist_rqbds.next,
929 struct ptlrpc_request_buffer_desc,
932 cfs_list_del(&rqbd->rqbd_list);
933 svcpt->scp_hist_nrqbds--;
935 /* remove rqbd's reqs from svc's req history while
936 * I've got the service lock */
937 cfs_list_for_each(tmp, &rqbd->rqbd_reqs) {
938 req = cfs_list_entry(tmp, struct ptlrpc_request,
940 /* Track the highest culled req seq */
941 if (req->rq_history_seq >
942 svcpt->scp_hist_seq_culled) {
943 svcpt->scp_hist_seq_culled =
946 cfs_list_del(&req->rq_history_list);
949 spin_unlock(&svcpt->scp_lock);
951 cfs_list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
952 req = cfs_list_entry(rqbd->rqbd_reqs.next,
953 struct ptlrpc_request,
955 cfs_list_del(&req->rq_list);
956 ptlrpc_server_free_request(req);
959 spin_lock(&svcpt->scp_lock);
961 * now all reqs including the embedded req has been
962 * disposed, schedule request buffer for re-use.
964 LASSERT(cfs_atomic_read(&rqbd->rqbd_req.rq_refcount) ==
966 cfs_list_add_tail(&rqbd->rqbd_list,
967 &svcpt->scp_rqbd_idle);
970 spin_unlock(&svcpt->scp_lock);
971 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
972 /* If we are low on memory, we are not interested in history */
973 cfs_list_del(&req->rq_list);
974 cfs_list_del_init(&req->rq_history_list);
976 /* Track the highest culled req seq */
977 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
978 svcpt->scp_hist_seq_culled = req->rq_history_seq;
980 spin_unlock(&svcpt->scp_lock);
982 ptlrpc_server_free_request(req);
984 spin_unlock(&svcpt->scp_lock);
989 * to finish a request: stop sending more early replies, and release
990 * the request. should be called after we finished handling the request.
992 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
993 struct ptlrpc_request *req)
995 ptlrpc_server_hpreq_fini(req);
997 spin_lock(&svcpt->scp_req_lock);
998 ptlrpc_nrs_req_stop_nolock(req);
999 svcpt->scp_nreqs_active--;
1001 svcpt->scp_nhreqs_active--;
1002 spin_unlock(&svcpt->scp_req_lock);
1004 ptlrpc_nrs_req_finalize(req);
1006 ptlrpc_server_drop_request(req);
1010 * This function makes sure dead exports are evicted in a timely manner.
1011 * This function is only called when some export receives a message (i.e.,
1012 * the network is up.)
1014 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
1016 struct obd_export *oldest_exp;
1017 time_t oldest_time, new_time;
1023 /* Compensate for slow machines, etc, by faking our request time
1024 into the future. Although this can break the strict time-ordering
1025 of the list, we can be really lazy here - we don't have to evict
1026 at the exact right moment. Eventually, all silent exports
1027 will make it to the top of the list. */
1029 /* Do not pay attention on 1sec or smaller renewals. */
1030 new_time = cfs_time_current_sec() + extra_delay;
1031 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1034 exp->exp_last_request_time = new_time;
1035 CDEBUG(D_HA, "updating export %s at "CFS_TIME_T" exp %p\n",
1036 exp->exp_client_uuid.uuid,
1037 exp->exp_last_request_time, exp);
1039 /* exports may get disconnected from the chain even though the
1040 export has references, so we must keep the spin lock while
1041 manipulating the lists */
1042 spin_lock(&exp->exp_obd->obd_dev_lock);
1044 if (cfs_list_empty(&exp->exp_obd_chain_timed)) {
1045 /* this one is not timed */
1046 spin_unlock(&exp->exp_obd->obd_dev_lock);
1050 cfs_list_move_tail(&exp->exp_obd_chain_timed,
1051 &exp->exp_obd->obd_exports_timed);
1053 oldest_exp = cfs_list_entry(exp->exp_obd->obd_exports_timed.next,
1054 struct obd_export, exp_obd_chain_timed);
1055 oldest_time = oldest_exp->exp_last_request_time;
1056 spin_unlock(&exp->exp_obd->obd_dev_lock);
1058 if (exp->exp_obd->obd_recovering) {
1059 /* be nice to everyone during recovery */
1064 /* Note - racing to start/reset the obd_eviction timer is safe */
1065 if (exp->exp_obd->obd_eviction_timer == 0) {
1066 /* Check if the oldest entry is expired. */
1067 if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
1069 /* We need a second timer, in case the net was down and
1070 * it just came back. Since the pinger may skip every
1071 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1072 * we better wait for 3. */
1073 exp->exp_obd->obd_eviction_timer =
1074 cfs_time_current_sec() + 3 * PING_INTERVAL;
1075 CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
1076 exp->exp_obd->obd_name,
1077 obd_export_nid2str(oldest_exp), oldest_time);
1080 if (cfs_time_current_sec() >
1081 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1082 /* The evictor won't evict anyone who we've heard from
1083 * recently, so we don't have to check before we start
1085 if (!ping_evictor_wake(exp))
1086 exp->exp_obd->obd_eviction_timer = 0;
1094 * Sanity check request \a req.
1095 * Return 0 if all is ok, error code otherwise.
1097 static int ptlrpc_check_req(struct ptlrpc_request *req)
1101 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1102 req->rq_export->exp_conn_cnt)) {
1103 DEBUG_REQ(D_RPCTRACE, req,
1104 "DROPPING req from old connection %d < %d",
1105 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1106 req->rq_export->exp_conn_cnt);
1109 if (unlikely(req->rq_export->exp_obd &&
1110 req->rq_export->exp_obd->obd_fail)) {
1111 /* Failing over, don't handle any more reqs, send
1112 error response instead. */
1113 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1114 req, req->rq_export->exp_obd->obd_name);
1116 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1117 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1118 !(req->rq_export->exp_obd->obd_recovering)) {
1119 DEBUG_REQ(D_ERROR, req,
1120 "Invalid replay without recovery");
1121 class_fail_export(req->rq_export);
1123 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1124 !(req->rq_export->exp_obd->obd_recovering)) {
1125 DEBUG_REQ(D_ERROR, req, "Invalid req with transno "
1126 LPU64" without recovery",
1127 lustre_msg_get_transno(req->rq_reqmsg));
1128 class_fail_export(req->rq_export);
1132 if (unlikely(rc < 0)) {
1133 req->rq_status = rc;
1139 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1141 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1144 if (array->paa_count == 0) {
1145 cfs_timer_disarm(&svcpt->scp_at_timer);
1149 /* Set timer for closest deadline */
1150 next = (__s32)(array->paa_deadline - cfs_time_current_sec() -
1153 ptlrpc_at_timer((unsigned long)svcpt);
1155 cfs_timer_arm(&svcpt->scp_at_timer, cfs_time_shift(next));
1156 CDEBUG(D_INFO, "armed %s at %+ds\n",
1157 svcpt->scp_service->srv_name, next);
1161 /* Add rpc to early reply check list */
1162 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1164 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1165 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1166 struct ptlrpc_request *rq = NULL;
1172 if (req->rq_no_reply)
1175 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1178 spin_lock(&svcpt->scp_at_lock);
1179 LASSERT(cfs_list_empty(&req->rq_timed_list));
1181 index = (unsigned long)req->rq_deadline % array->paa_size;
1182 if (array->paa_reqs_count[index] > 0) {
1183 /* latest rpcs will have the latest deadlines in the list,
1184 * so search backward. */
1185 cfs_list_for_each_entry_reverse(rq,
1186 &array->paa_reqs_array[index],
1188 if (req->rq_deadline >= rq->rq_deadline) {
1189 cfs_list_add(&req->rq_timed_list,
1190 &rq->rq_timed_list);
1196 /* Add the request at the head of the list */
1197 if (cfs_list_empty(&req->rq_timed_list))
1198 cfs_list_add(&req->rq_timed_list,
1199 &array->paa_reqs_array[index]);
1201 spin_lock(&req->rq_lock);
1202 req->rq_at_linked = 1;
1203 spin_unlock(&req->rq_lock);
1204 req->rq_at_index = index;
1205 array->paa_reqs_count[index]++;
1207 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1208 array->paa_deadline = req->rq_deadline;
1209 ptlrpc_at_set_timer(svcpt);
1211 spin_unlock(&svcpt->scp_at_lock);
1217 ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1219 struct ptlrpc_at_array *array;
1221 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1223 /* NB: must call with hold svcpt::scp_at_lock */
1224 LASSERT(!cfs_list_empty(&req->rq_timed_list));
1225 cfs_list_del_init(&req->rq_timed_list);
1227 spin_lock(&req->rq_lock);
1228 req->rq_at_linked = 0;
1229 spin_unlock(&req->rq_lock);
1231 array->paa_reqs_count[req->rq_at_index]--;
1235 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1237 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1238 struct ptlrpc_request *reqcopy;
1239 struct lustre_msg *reqmsg;
1240 cfs_duration_t olddl = req->rq_deadline - cfs_time_current_sec();
1245 /* deadline is when the client expects us to reply, margin is the
1246 difference between clients' and servers' expectations */
1247 DEBUG_REQ(D_ADAPTTO, req,
1248 "%ssending early reply (deadline %+lds, margin %+lds) for "
1249 "%d+%d", AT_OFF ? "AT off - not " : "",
1250 olddl, olddl - at_get(&svcpt->scp_at_estimate),
1251 at_get(&svcpt->scp_at_estimate), at_extra);
1257 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), "
1258 "not sending early reply. Consider increasing "
1259 "at_early_margin (%d)?", olddl, at_early_margin);
1261 /* Return an error so we're not re-added to the timed list. */
1265 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
1266 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
1267 "but no AT support");
1271 if (req->rq_export &&
1272 lustre_msg_get_flags(req->rq_reqmsg) &
1273 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1274 /* During recovery, we don't want to send too many early
1275 * replies, but on the other hand we want to make sure the
1276 * client has enough time to resend if the rpc is lost. So
1277 * during the recovery period send at least 4 early replies,
1278 * spacing them every at_extra if we can. at_estimate should
1279 * always equal this fixed value during recovery. */
1280 at_measured(&svcpt->scp_at_estimate, min(at_extra,
1281 req->rq_export->exp_obd->obd_recovery_timeout / 4));
1283 /* Fake our processing time into the future to ask the clients
1284 * for some extra amount of time */
1285 at_measured(&svcpt->scp_at_estimate, at_extra +
1286 cfs_time_current_sec() -
1287 req->rq_arrival_time.tv_sec);
1289 /* Check to see if we've actually increased the deadline -
1290 * we may be past adaptive_max */
1291 if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
1292 at_get(&svcpt->scp_at_estimate)) {
1293 DEBUG_REQ(D_WARNING, req, "Couldn't add any time "
1294 "(%ld/%ld), not sending early reply\n",
1295 olddl, req->rq_arrival_time.tv_sec +
1296 at_get(&svcpt->scp_at_estimate) -
1297 cfs_time_current_sec());
1301 newdl = cfs_time_current_sec() + at_get(&svcpt->scp_at_estimate);
1303 OBD_ALLOC(reqcopy, sizeof *reqcopy);
1304 if (reqcopy == NULL)
1306 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1308 OBD_FREE(reqcopy, sizeof *reqcopy);
1313 reqcopy->rq_reply_state = NULL;
1314 reqcopy->rq_rep_swab_mask = 0;
1315 reqcopy->rq_pack_bulk = 0;
1316 reqcopy->rq_pack_udesc = 0;
1317 reqcopy->rq_packed_final = 0;
1318 sptlrpc_svc_ctx_addref(reqcopy);
1319 /* We only need the reqmsg for the magic */
1320 reqcopy->rq_reqmsg = reqmsg;
1321 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1323 LASSERT(cfs_atomic_read(&req->rq_refcount));
1324 /** if it is last refcount then early reply isn't needed */
1325 if (cfs_atomic_read(&req->rq_refcount) == 1) {
1326 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1327 "abort sending early reply\n");
1328 GOTO(out, rc = -EINVAL);
1331 /* Connection ref */
1332 reqcopy->rq_export = class_conn2export(
1333 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1334 if (reqcopy->rq_export == NULL)
1335 GOTO(out, rc = -ENODEV);
1338 class_export_rpc_get(reqcopy->rq_export);
1339 if (reqcopy->rq_export->exp_obd &&
1340 reqcopy->rq_export->exp_obd->obd_fail)
1341 GOTO(out_put, rc = -ENODEV);
1343 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1347 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1350 /* Adjust our own deadline to what we told the client */
1351 req->rq_deadline = newdl;
1352 req->rq_early_count++; /* number sent, server side */
1354 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1357 /* Free the (early) reply state from lustre_pack_reply.
1358 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1359 ptlrpc_req_drop_rs(reqcopy);
1362 class_export_rpc_put(reqcopy->rq_export);
1363 class_export_put(reqcopy->rq_export);
1365 sptlrpc_svc_ctx_decref(reqcopy);
1366 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1367 OBD_FREE(reqcopy, sizeof *reqcopy);
1371 /* Send early replies to everybody expiring within at_early_margin
1372 asking for at_extra time */
1373 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1375 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1376 struct ptlrpc_request *rq, *n;
1377 cfs_list_t work_list;
1380 time_t now = cfs_time_current_sec();
1381 cfs_duration_t delay;
1382 int first, counter = 0;
1385 spin_lock(&svcpt->scp_at_lock);
1386 if (svcpt->scp_at_check == 0) {
1387 spin_unlock(&svcpt->scp_at_lock);
1390 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1391 svcpt->scp_at_check = 0;
1393 if (array->paa_count == 0) {
1394 spin_unlock(&svcpt->scp_at_lock);
1398 /* The timer went off, but maybe the nearest rpc already completed. */
1399 first = array->paa_deadline - now;
1400 if (first > at_early_margin) {
1401 /* We've still got plenty of time. Reset the timer. */
1402 ptlrpc_at_set_timer(svcpt);
1403 spin_unlock(&svcpt->scp_at_lock);
1407 /* We're close to a timeout, and we don't know how much longer the
1408 server will take. Send early replies to everyone expiring soon. */
1409 CFS_INIT_LIST_HEAD(&work_list);
1411 index = (unsigned long)array->paa_deadline % array->paa_size;
1412 count = array->paa_count;
1414 count -= array->paa_reqs_count[index];
1415 cfs_list_for_each_entry_safe(rq, n,
1416 &array->paa_reqs_array[index],
1418 if (rq->rq_deadline > now + at_early_margin) {
1419 /* update the earliest deadline */
1420 if (deadline == -1 ||
1421 rq->rq_deadline < deadline)
1422 deadline = rq->rq_deadline;
1426 ptlrpc_at_remove_timed(rq);
1428 * ptlrpc_server_drop_request() may drop
1429 * refcount to 0 already. Let's check this and
1430 * don't add entry to work_list
1432 if (likely(cfs_atomic_inc_not_zero(&rq->rq_refcount)))
1433 cfs_list_add(&rq->rq_timed_list, &work_list);
1437 if (++index >= array->paa_size)
1440 array->paa_deadline = deadline;
1441 /* we have a new earliest deadline, restart the timer */
1442 ptlrpc_at_set_timer(svcpt);
1444 spin_unlock(&svcpt->scp_at_lock);
1446 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1447 "replies\n", first, at_extra, counter);
1449 /* We're already past request deadlines before we even get a
1450 chance to send early replies */
1451 LCONSOLE_WARN("%s: This server is not able to keep up with "
1452 "request traffic (cpu-bound).\n",
1453 svcpt->scp_service->srv_name);
1454 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
1455 "delay="CFS_DURATION_T"(jiff)\n",
1456 counter, svcpt->scp_nreqs_incoming,
1457 svcpt->scp_nreqs_active,
1458 at_get(&svcpt->scp_at_estimate), delay);
1461 /* we took additional refcount so entries can't be deleted from list, no
1462 * locking is needed */
1463 while (!cfs_list_empty(&work_list)) {
1464 rq = cfs_list_entry(work_list.next, struct ptlrpc_request,
1466 cfs_list_del_init(&rq->rq_timed_list);
1468 if (ptlrpc_at_send_early_reply(rq) == 0)
1469 ptlrpc_at_add_timed(rq);
1471 ptlrpc_server_drop_request(rq);
1474 RETURN(1); /* return "did_something" for liblustre */
1478 * Put the request to the export list if the request may become
1479 * a high priority one.
1481 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1482 struct ptlrpc_request *req)
1487 if (svcpt->scp_service->srv_ops.so_hpreq_handler) {
1488 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1493 if (req->rq_export && req->rq_ops) {
1494 /* Perform request specific check. We should do this check
1495 * before the request is added into exp_hp_rpcs list otherwise
1496 * it may hit swab race at LU-1044. */
1497 if (req->rq_ops->hpreq_check) {
1498 rc = req->rq_ops->hpreq_check(req);
1500 * XXX: Out of all current
1501 * ptlrpc_hpreq_ops::hpreq_check(), only
1502 * ldlm_cancel_hpreq_check() can return an error code;
1503 * other functions assert in similar places, which seems
1504 * odd. What also does not seem right is that handlers
1505 * for those RPCs do not assert on the same checks, but
1506 * rather handle the error cases. e.g. see
1507 * ost_rw_hpreq_check(), and ost_brw_read(),
1512 LASSERT(rc == 0 || rc == 1);
1515 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1516 cfs_list_add(&req->rq_exp_list,
1517 &req->rq_export->exp_hp_rpcs);
1518 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1521 ptlrpc_nrs_req_initialize(svcpt, req, rc);
1526 /** Remove the request from the export list. */
1527 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1530 if (req->rq_export && req->rq_ops) {
1531 /* refresh lock timeout again so that client has more
1532 * room to send lock cancel RPC. */
1533 if (req->rq_ops->hpreq_fini)
1534 req->rq_ops->hpreq_fini(req);
1536 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1537 cfs_list_del_init(&req->rq_exp_list);
1538 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1543 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1548 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1549 .hpreq_check = ptlrpc_hpreq_check,
1552 /* Hi-Priority RPC check by RPC operation code. */
1553 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1555 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1557 /* Check for export to let only reconnects for not yet evicted
1558 * export to become a HP rpc. */
1559 if ((req->rq_export != NULL) &&
1560 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1561 req->rq_ops = &ptlrpc_hpreq_common;
1565 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1567 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1568 struct ptlrpc_request *req)
1573 rc = ptlrpc_server_hpreq_init(svcpt, req);
1577 ptlrpc_nrs_req_add(svcpt, req, !!rc);
1583 * Allow to handle high priority request
1584 * User can call it w/o any lock but need to hold
1585 * ptlrpc_service_part::scp_req_lock to get reliable result
1587 static int ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1590 int running = svcpt->scp_nthrs_running;
1592 if (!nrs_svcpt_has_hp(svcpt))
1598 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1599 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1600 /* leave just 1 thread for normal RPCs */
1601 running = PTLRPC_NTHRS_INIT;
1602 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1606 if (svcpt->scp_nreqs_active >= running - 1)
1609 if (svcpt->scp_nhreqs_active == 0)
1612 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1613 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1616 static int ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1619 return ptlrpc_server_allow_high(svcpt, force) &&
1620 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1624 * Only allow normal priority requests on a service that has a high-priority
1625 * queue if forced (i.e. cleanup), if there are other high priority requests
1626 * already being processed (i.e. those threads can service more high-priority
1627 * requests), or if there are enough idle threads that a later thread can do
1628 * a high priority request.
1629 * User can call it w/o any lock but need to hold
1630 * ptlrpc_service_part::scp_req_lock to get reliable result
1632 static int ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1635 int running = svcpt->scp_nthrs_running;
1637 if (1) /* always allow to handle normal request for liblustre */
1640 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1641 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1642 /* leave just 1 thread for normal RPCs */
1643 running = PTLRPC_NTHRS_INIT;
1644 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1649 svcpt->scp_nreqs_active < running - 2)
1652 if (svcpt->scp_nreqs_active >= running - 1)
1655 return svcpt->scp_nhreqs_active > 0 ||
1656 !nrs_svcpt_has_hp(svcpt);
1659 static int 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, int 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, int force)
1689 struct ptlrpc_request *req;
1692 if (ptlrpc_server_high_pending(svcpt, force)) {
1693 req = ptlrpc_nrs_req_poll_nolock(svcpt, true);
1694 svcpt->scp_hreq_count++;
1698 if (ptlrpc_server_normal_pending(svcpt, force)) {
1699 req = ptlrpc_nrs_req_poll_nolock(svcpt, false);
1700 svcpt->scp_hreq_count = 0;
1707 * Handle freshly incoming reqs, add to timed early reply list,
1708 * pass on to regular request queue.
1709 * All incoming requests pass through here before getting into
1710 * ptlrpc_server_handle_req later on.
1713 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt)
1715 struct ptlrpc_service *svc = svcpt->scp_service;
1716 struct ptlrpc_request *req;
1721 spin_lock(&svcpt->scp_lock);
1722 if (cfs_list_empty(&svcpt->scp_req_incoming)) {
1723 spin_unlock(&svcpt->scp_lock);
1727 req = cfs_list_entry(svcpt->scp_req_incoming.next,
1728 struct ptlrpc_request, rq_list);
1729 cfs_list_del_init(&req->rq_list);
1730 svcpt->scp_nreqs_incoming--;
1731 /* Consider this still a "queued" request as far as stats are
1733 spin_unlock(&svcpt->scp_lock);
1735 /* go through security check/transform */
1736 rc = sptlrpc_svc_unwrap_request(req);
1740 case SECSVC_COMPLETE:
1741 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1750 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1751 * redo it wouldn't be harmful.
1753 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1754 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1756 CERROR("error unpacking request: ptl %d from %s "
1757 "x"LPU64"\n", svc->srv_req_portal,
1758 libcfs_id2str(req->rq_peer), req->rq_xid);
1763 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1765 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1766 LPU64"\n", svc->srv_req_portal,
1767 libcfs_id2str(req->rq_peer), req->rq_xid);
1771 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1772 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1773 CERROR("drop incoming rpc opc %u, x"LPU64"\n",
1774 cfs_fail_val, req->rq_xid);
1779 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1780 CERROR("wrong packet type received (type=%u) from %s\n",
1781 lustre_msg_get_type(req->rq_reqmsg),
1782 libcfs_id2str(req->rq_peer));
1786 switch(lustre_msg_get_opc(req->rq_reqmsg)) {
1789 req->rq_bulk_write = 1;
1793 case MGS_CONFIG_READ:
1794 req->rq_bulk_read = 1;
1798 CDEBUG(D_RPCTRACE, "got req x"LPU64"\n", req->rq_xid);
1800 req->rq_export = class_conn2export(
1801 lustre_msg_get_handle(req->rq_reqmsg));
1802 if (req->rq_export) {
1803 class_export_rpc_get(req->rq_export);
1804 rc = ptlrpc_check_req(req);
1806 rc = sptlrpc_target_export_check(req->rq_export, req);
1808 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1809 "illegal security flavor,");
1814 ptlrpc_update_export_timer(req->rq_export, 0);
1817 /* req_in handling should/must be fast */
1818 if (cfs_time_current_sec() - req->rq_arrival_time.tv_sec > 5)
1819 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1820 cfs_time_sub(cfs_time_current_sec(),
1821 req->rq_arrival_time.tv_sec));
1823 /* Set rpc server deadline and add it to the timed list */
1824 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1825 MSGHDR_AT_SUPPORT) ?
1826 /* The max time the client expects us to take */
1827 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1828 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1829 if (unlikely(deadline == 0)) {
1830 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1834 ptlrpc_at_add_timed(req);
1836 /* Move it over to the request processing queue */
1837 rc = ptlrpc_server_request_add(svcpt, req);
1839 ptlrpc_server_hpreq_fini(req);
1842 cfs_waitq_signal(&svcpt->scp_waitq);
1847 class_export_rpc_put(req->rq_export);
1848 spin_lock(&svcpt->scp_req_lock);
1849 svcpt->scp_nreqs_active++;
1850 spin_unlock(&svcpt->scp_req_lock);
1851 ptlrpc_server_finish_request(svcpt, req);
1857 * Main incoming request handling logic.
1858 * Calls handler function from service to do actual processing.
1861 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
1862 struct ptlrpc_thread *thread)
1864 struct ptlrpc_service *svc = svcpt->scp_service;
1865 struct obd_export *export = NULL;
1866 struct ptlrpc_request *request;
1867 struct timeval work_start;
1868 struct timeval work_end;
1874 spin_lock(&svcpt->scp_req_lock);
1876 /* !@%$# liblustre only has 1 thread */
1877 if (cfs_atomic_read(&svcpt->scp_nreps_difficult) != 0) {
1878 spin_unlock(&svcpt->scp_req_lock);
1882 request = ptlrpc_server_request_get(svcpt, 0);
1883 if (request == NULL) {
1884 spin_unlock(&svcpt->scp_req_lock);
1888 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1889 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1890 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1891 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1893 if (unlikely(fail_opc)) {
1894 if (request->rq_export && request->rq_ops) {
1895 spin_unlock(&svcpt->scp_req_lock);
1897 OBD_FAIL_TIMEOUT(fail_opc, 4);
1899 spin_lock(&svcpt->scp_req_lock);
1900 request = ptlrpc_server_request_get(svcpt, 0);
1901 if (request == NULL) {
1902 spin_unlock(&svcpt->scp_req_lock);
1907 ptlrpc_nrs_req_del_nolock(request);
1908 svcpt->scp_nreqs_active++;
1910 svcpt->scp_nhreqs_active++;
1912 ptlrpc_nrs_req_start_nolock(request);
1913 spin_unlock(&svcpt->scp_req_lock);
1915 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1917 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1918 libcfs_debug_dumplog();
1920 cfs_gettimeofday(&work_start);
1921 timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
1922 if (likely(svc->srv_stats != NULL)) {
1923 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1925 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1926 svcpt->scp_nreqs_incoming);
1927 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1928 svcpt->scp_nreqs_active);
1929 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1930 at_get(&svcpt->scp_at_estimate));
1933 export = request->rq_export;
1934 rc = lu_context_init(&request->rq_session, LCT_SESSION | LCT_NOREF);
1936 CERROR("Failure to initialize session: %d\n", rc);
1939 request->rq_session.lc_thread = thread;
1940 request->rq_session.lc_cookie = 0x5;
1941 lu_context_enter(&request->rq_session);
1943 CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
1945 request->rq_svc_thread = thread;
1947 request->rq_svc_thread->t_env->le_ses = &request->rq_session;
1949 if (likely(request->rq_export)) {
1950 if (unlikely(ptlrpc_check_req(request)))
1952 ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
1955 /* Discard requests queued for longer than the deadline.
1956 The deadline is increased if we send an early reply. */
1957 if (cfs_time_current_sec() > request->rq_deadline) {
1958 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s"
1959 ": deadline "CFS_DURATION_T":"CFS_DURATION_T"s ago\n",
1960 libcfs_id2str(request->rq_peer),
1961 cfs_time_sub(request->rq_deadline,
1962 request->rq_arrival_time.tv_sec),
1963 cfs_time_sub(cfs_time_current_sec(),
1964 request->rq_deadline));
1968 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
1969 "%s:%s+%d:%d:x"LPU64":%s:%d\n", cfs_curproc_comm(),
1970 (request->rq_export ?
1971 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1972 (request->rq_export ?
1973 cfs_atomic_read(&request->rq_export->exp_refcount) : -99),
1974 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1975 libcfs_id2str(request->rq_peer),
1976 lustre_msg_get_opc(request->rq_reqmsg));
1978 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1979 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
1981 rc = svc->srv_ops.so_req_handler(request);
1983 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1986 lu_context_exit(&request->rq_session);
1987 lu_context_fini(&request->rq_session);
1989 if (unlikely(cfs_time_current_sec() > request->rq_deadline)) {
1990 DEBUG_REQ(D_WARNING, request, "Request took longer "
1991 "than estimated ("CFS_DURATION_T":"CFS_DURATION_T"s);"
1992 " client may timeout.",
1993 cfs_time_sub(request->rq_deadline,
1994 request->rq_arrival_time.tv_sec),
1995 cfs_time_sub(cfs_time_current_sec(),
1996 request->rq_deadline));
1999 cfs_gettimeofday(&work_end);
2000 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
2001 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
2002 "%s:%s+%d:%d:x"LPU64":%s:%d Request procesed in "
2003 "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
2005 (request->rq_export ?
2006 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2007 (request->rq_export ?
2008 cfs_atomic_read(&request->rq_export->exp_refcount) : -99),
2009 lustre_msg_get_status(request->rq_reqmsg),
2011 libcfs_id2str(request->rq_peer),
2012 lustre_msg_get_opc(request->rq_reqmsg),
2014 cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
2015 (request->rq_repmsg ?
2016 lustre_msg_get_transno(request->rq_repmsg) :
2017 request->rq_transno),
2019 (request->rq_repmsg ?
2020 lustre_msg_get_status(request->rq_repmsg) : -999));
2021 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2022 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2023 int opc = opcode_offset(op);
2024 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2025 LASSERT(opc < LUSTRE_MAX_OPCODES);
2026 lprocfs_counter_add(svc->srv_stats,
2027 opc + EXTRA_MAX_OPCODES,
2031 if (unlikely(request->rq_early_count)) {
2032 DEBUG_REQ(D_ADAPTTO, request,
2033 "sent %d early replies before finishing in "
2035 request->rq_early_count,
2036 cfs_time_sub(work_end.tv_sec,
2037 request->rq_arrival_time.tv_sec));
2042 class_export_rpc_put(export);
2043 ptlrpc_server_finish_request(svcpt, request);
2049 * An internal function to process a single reply state object.
2052 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2054 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2055 struct ptlrpc_service *svc = svcpt->scp_service;
2056 struct obd_export *exp;
2061 exp = rs->rs_export;
2063 LASSERT (rs->rs_difficult);
2064 LASSERT (rs->rs_scheduled);
2065 LASSERT (cfs_list_empty(&rs->rs_list));
2067 spin_lock(&exp->exp_lock);
2068 /* Noop if removed already */
2069 cfs_list_del_init (&rs->rs_exp_list);
2070 spin_unlock(&exp->exp_lock);
2072 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2073 * iterates over newly committed replies, removing them from
2074 * exp_uncommitted_replies. It then drops this lock and schedules the
2075 * replies it found for handling here.
2077 * We can avoid contention for exp_uncommitted_replies_lock between the
2078 * HRT threads and further commit callbacks by checking rs_committed
2079 * which is set in the commit callback while it holds both
2080 * rs_lock and exp_uncommitted_reples.
2082 * If we see rs_committed clear, the commit callback _may_ not have
2083 * handled this reply yet and we race with it to grab
2084 * exp_uncommitted_replies_lock before removing the reply from
2085 * exp_uncommitted_replies. Note that if we lose the race and the
2086 * reply has already been removed, list_del_init() is a noop.
2088 * If we see rs_committed set, we know the commit callback is handling,
2089 * or has handled this reply since store reordering might allow us to
2090 * see rs_committed set out of sequence. But since this is done
2091 * holding rs_lock, we can be sure it has all completed once we hold
2092 * rs_lock, which we do right next.
2094 if (!rs->rs_committed) {
2095 spin_lock(&exp->exp_uncommitted_replies_lock);
2096 cfs_list_del_init(&rs->rs_obd_list);
2097 spin_unlock(&exp->exp_uncommitted_replies_lock);
2100 spin_lock(&rs->rs_lock);
2102 been_handled = rs->rs_handled;
2105 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2106 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2108 if (nlocks == 0 && !been_handled) {
2109 /* If we see this, we should already have seen the warning
2110 * in mds_steal_ack_locks() */
2111 CDEBUG(D_HA, "All locks stolen from rs %p x"LPD64".t"LPD64
2114 rs->rs_xid, rs->rs_transno, rs->rs_opc,
2115 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2118 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2119 spin_unlock(&rs->rs_lock);
2121 if (!been_handled && rs->rs_on_net) {
2122 LNetMDUnlink(rs->rs_md_h);
2123 /* Ignore return code; we're racing with completion */
2126 while (nlocks-- > 0)
2127 ldlm_lock_decref(&rs->rs_locks[nlocks],
2128 rs->rs_modes[nlocks]);
2130 spin_lock(&rs->rs_lock);
2133 rs->rs_scheduled = 0;
2135 if (!rs->rs_on_net) {
2137 spin_unlock(&rs->rs_lock);
2139 class_export_put (exp);
2140 rs->rs_export = NULL;
2141 ptlrpc_rs_decref (rs);
2142 if (cfs_atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2143 svc->srv_is_stopping)
2144 cfs_waitq_broadcast(&svcpt->scp_waitq);
2148 /* still on the net; callback will schedule */
2149 spin_unlock(&rs->rs_lock);
2156 * Check whether given service has a reply available for processing
2159 * \param svc a ptlrpc service
2160 * \retval 0 no replies processed
2161 * \retval 1 one reply processed
2164 ptlrpc_server_handle_reply(struct ptlrpc_service_part *svcpt)
2166 struct ptlrpc_reply_state *rs = NULL;
2169 spin_lock(&svcpt->scp_rep_lock);
2170 if (!cfs_list_empty(&svcpt->scp_rep_queue)) {
2171 rs = cfs_list_entry(svcpt->scp_rep_queue.prev,
2172 struct ptlrpc_reply_state,
2174 cfs_list_del_init(&rs->rs_list);
2176 spin_unlock(&svcpt->scp_rep_lock);
2178 ptlrpc_handle_rs(rs);
2182 /* FIXME make use of timeout later */
2184 liblustre_check_services (void *arg)
2186 int did_something = 0;
2188 cfs_list_t *tmp, *nxt;
2191 /* I'm relying on being single threaded, not to have to lock
2192 * ptlrpc_all_services etc */
2193 cfs_list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
2194 struct ptlrpc_service *svc =
2195 cfs_list_entry (tmp, struct ptlrpc_service, srv_list);
2196 struct ptlrpc_service_part *svcpt;
2198 LASSERT(svc->srv_ncpts == 1);
2199 svcpt = svc->srv_parts[0];
2201 if (svcpt->scp_nthrs_running != 0) /* I've recursed */
2204 /* service threads can block for bulk, so this limits us
2205 * (arbitrarily) to recursing 1 stack frame per service.
2206 * Note that the problem with recursion is that we have to
2207 * unwind completely before our caller can resume. */
2209 svcpt->scp_nthrs_running++;
2212 rc = ptlrpc_server_handle_req_in(svcpt);
2213 rc |= ptlrpc_server_handle_reply(svcpt);
2214 rc |= ptlrpc_at_check_timed(svcpt);
2215 rc |= ptlrpc_server_handle_request(svcpt, NULL);
2216 rc |= (ptlrpc_server_post_idle_rqbds(svcpt) > 0);
2217 did_something |= rc;
2220 svcpt->scp_nthrs_running--;
2223 RETURN(did_something);
2225 #define ptlrpc_stop_all_threads(s) do {} while (0)
2227 #else /* __KERNEL__ */
2230 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2232 int avail = svcpt->scp_nrqbds_posted;
2233 int low_water = test_req_buffer_pressure ? 0 :
2234 svcpt->scp_service->srv_nbuf_per_group / 2;
2236 /* NB I'm not locking; just looking. */
2238 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2239 * allowed the request history to grow out of control. We could put a
2240 * sanity check on that here and cull some history if we need the
2243 if (avail <= low_water)
2244 ptlrpc_grow_req_bufs(svcpt, 1);
2246 if (svcpt->scp_service->srv_stats) {
2247 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2248 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2253 ptlrpc_retry_rqbds(void *arg)
2255 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2257 svcpt->scp_rqbd_timeout = 0;
2262 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2264 return svcpt->scp_nreqs_active <
2265 svcpt->scp_nthrs_running - 1 -
2266 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2270 * allowed to create more threads
2271 * user can call it w/o any lock but need to hold
2272 * ptlrpc_service_part::scp_lock to get reliable result
2275 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2277 return svcpt->scp_nthrs_running +
2278 svcpt->scp_nthrs_starting <
2279 svcpt->scp_service->srv_nthrs_cpt_limit;
2283 * too many requests and allowed to create more threads
2286 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2288 return !ptlrpc_threads_enough(svcpt) &&
2289 ptlrpc_threads_increasable(svcpt);
2293 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2295 return thread_is_stopping(thread) ||
2296 thread->t_svcpt->scp_service->srv_is_stopping;
2300 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2302 return !cfs_list_empty(&svcpt->scp_rqbd_idle) &&
2303 svcpt->scp_rqbd_timeout == 0;
2307 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2309 return svcpt->scp_at_check;
2313 * requests wait on preprocessing
2314 * user can call it w/o any lock but need to hold
2315 * ptlrpc_service_part::scp_lock to get reliable result
2318 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2320 return !cfs_list_empty(&svcpt->scp_req_incoming);
2323 static __attribute__((__noinline__)) int
2324 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2325 struct ptlrpc_thread *thread)
2327 /* Don't exit while there are replies to be handled */
2328 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2329 ptlrpc_retry_rqbds, svcpt);
2331 lc_watchdog_disable(thread->t_watchdog);
2335 l_wait_event_exclusive_head(svcpt->scp_waitq,
2336 ptlrpc_thread_stopping(thread) ||
2337 ptlrpc_server_request_incoming(svcpt) ||
2338 ptlrpc_server_request_pending(svcpt, 0) ||
2339 ptlrpc_rqbd_pending(svcpt) ||
2340 ptlrpc_at_check(svcpt), &lwi);
2342 if (ptlrpc_thread_stopping(thread))
2345 lc_watchdog_touch(thread->t_watchdog,
2346 ptlrpc_server_get_timeout(svcpt));
2351 * Main thread body for service threads.
2352 * Waits in a loop waiting for new requests to process to appear.
2353 * Every time an incoming requests is added to its queue, a waitq
2354 * is woken up and one of the threads will handle it.
2356 static int ptlrpc_main(void *arg)
2358 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2359 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2360 struct ptlrpc_service *svc = svcpt->scp_service;
2361 struct ptlrpc_reply_state *rs;
2362 #ifdef WITH_GROUP_INFO
2363 cfs_group_info_t *ginfo = NULL;
2366 int counter = 0, rc = 0;
2369 thread->t_pid = cfs_curproc_pid();
2370 cfs_daemonize_ctxt(thread->t_name);
2372 /* NB: we will call cfs_cpt_bind() for all threads, because we
2373 * might want to run lustre server only on a subset of system CPUs,
2374 * in that case ->scp_cpt is CFS_CPT_ANY */
2375 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2377 CWARN("%s: failed to bind %s on CPT %d\n",
2378 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2381 #ifdef WITH_GROUP_INFO
2382 ginfo = cfs_groups_alloc(0);
2388 cfs_set_current_groups(ginfo);
2389 cfs_put_group_info(ginfo);
2392 if (svc->srv_ops.so_thr_init != NULL) {
2393 rc = svc->srv_ops.so_thr_init(thread);
2404 rc = lu_context_init(&env->le_ctx,
2405 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2409 thread->t_env = env;
2410 env->le_ctx.lc_thread = thread;
2411 env->le_ctx.lc_cookie = 0x6;
2413 while (!cfs_list_empty(&svcpt->scp_rqbd_idle)) {
2414 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2418 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2419 svc->srv_name, svcpt->scp_cpt, rc);
2423 /* Alloc reply state structure for this one */
2424 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2430 spin_lock(&svcpt->scp_lock);
2432 LASSERT(thread_is_starting(thread));
2433 thread_clear_flags(thread, SVC_STARTING);
2435 LASSERT(svcpt->scp_nthrs_starting == 1);
2436 svcpt->scp_nthrs_starting--;
2438 /* SVC_STOPPING may already be set here if someone else is trying
2439 * to stop the service while this new thread has been dynamically
2440 * forked. We still set SVC_RUNNING to let our creator know that
2441 * we are now running, however we will exit as soon as possible */
2442 thread_add_flags(thread, SVC_RUNNING);
2443 svcpt->scp_nthrs_running++;
2444 spin_unlock(&svcpt->scp_lock);
2446 /* wake up our creator in case he's still waiting. */
2447 cfs_waitq_signal(&thread->t_ctl_waitq);
2449 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2452 spin_lock(&svcpt->scp_rep_lock);
2453 cfs_list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2454 cfs_waitq_signal(&svcpt->scp_rep_waitq);
2455 spin_unlock(&svcpt->scp_rep_lock);
2457 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2458 svcpt->scp_nthrs_running);
2460 /* XXX maintain a list of all managed devices: insert here */
2461 while (!ptlrpc_thread_stopping(thread)) {
2462 if (ptlrpc_wait_event(svcpt, thread))
2465 ptlrpc_check_rqbd_pool(svcpt);
2467 if (ptlrpc_threads_need_create(svcpt)) {
2468 /* Ignore return code - we tried... */
2469 ptlrpc_start_thread(svcpt, 0);
2472 /* Process all incoming reqs before handling any */
2473 if (ptlrpc_server_request_incoming(svcpt)) {
2474 ptlrpc_server_handle_req_in(svcpt);
2475 /* but limit ourselves in case of flood */
2476 if (counter++ < 100)
2481 if (ptlrpc_at_check(svcpt))
2482 ptlrpc_at_check_timed(svcpt);
2484 if (ptlrpc_server_request_pending(svcpt, 0)) {
2485 lu_context_enter(&env->le_ctx);
2486 ptlrpc_server_handle_request(svcpt, thread);
2487 lu_context_exit(&env->le_ctx);
2490 if (ptlrpc_rqbd_pending(svcpt) &&
2491 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2492 /* I just failed to repost request buffers.
2493 * Wait for a timeout (unless something else
2494 * happens) before I try again */
2495 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2496 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2497 svcpt->scp_nrqbds_posted);
2501 lc_watchdog_delete(thread->t_watchdog);
2502 thread->t_watchdog = NULL;
2506 * deconstruct service specific state created by ptlrpc_start_thread()
2508 if (svc->srv_ops.so_thr_done != NULL)
2509 svc->srv_ops.so_thr_done(thread);
2512 lu_context_fini(&env->le_ctx);
2516 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2517 thread, thread->t_pid, thread->t_id, rc);
2519 spin_lock(&svcpt->scp_lock);
2520 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2521 svcpt->scp_nthrs_starting--;
2523 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2524 /* must know immediately */
2525 svcpt->scp_nthrs_running--;
2529 thread_add_flags(thread, SVC_STOPPED);
2531 cfs_waitq_signal(&thread->t_ctl_waitq);
2532 spin_unlock(&svcpt->scp_lock);
2537 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2538 cfs_list_t *replies)
2542 spin_lock(&hrt->hrt_lock);
2544 cfs_list_splice_init(&hrt->hrt_queue, replies);
2545 result = ptlrpc_hr.hr_stopping || !cfs_list_empty(replies);
2547 spin_unlock(&hrt->hrt_lock);
2552 * Main body of "handle reply" function.
2553 * It processes acked reply states
2555 static int ptlrpc_hr_main(void *arg)
2557 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2558 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2559 CFS_LIST_HEAD (replies);
2560 char threadname[20];
2563 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2564 hrp->hrp_cpt, hrt->hrt_id);
2565 cfs_daemonize_ctxt(threadname);
2567 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2569 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2570 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2573 cfs_atomic_inc(&hrp->hrp_nstarted);
2574 cfs_waitq_signal(&ptlrpc_hr.hr_waitq);
2576 while (!ptlrpc_hr.hr_stopping) {
2577 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2579 while (!cfs_list_empty(&replies)) {
2580 struct ptlrpc_reply_state *rs;
2582 rs = cfs_list_entry(replies.prev,
2583 struct ptlrpc_reply_state,
2585 cfs_list_del_init(&rs->rs_list);
2586 ptlrpc_handle_rs(rs);
2590 cfs_atomic_inc(&hrp->hrp_nstopped);
2591 cfs_waitq_signal(&ptlrpc_hr.hr_waitq);
2596 static void ptlrpc_stop_hr_threads(void)
2598 struct ptlrpc_hr_partition *hrp;
2602 ptlrpc_hr.hr_stopping = 1;
2604 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2605 if (hrp->hrp_thrs == NULL)
2606 continue; /* uninitialized */
2607 for (j = 0; j < hrp->hrp_nthrs; j++)
2608 cfs_waitq_broadcast(&hrp->hrp_thrs[j].hrt_waitq);
2611 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2612 if (hrp->hrp_thrs == NULL)
2613 continue; /* uninitialized */
2614 cfs_wait_event(ptlrpc_hr.hr_waitq,
2615 cfs_atomic_read(&hrp->hrp_nstopped) ==
2616 cfs_atomic_read(&hrp->hrp_nstarted));
2620 static int ptlrpc_start_hr_threads(void)
2622 struct ptlrpc_hr_partition *hrp;
2627 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2630 for (j = 0; j < hrp->hrp_nthrs; j++) {
2631 rc = cfs_create_thread(ptlrpc_hr_main,
2633 CLONE_VM | CLONE_FILES);
2637 cfs_wait_event(ptlrpc_hr.hr_waitq,
2638 cfs_atomic_read(&hrp->hrp_nstarted) == j);
2642 CERROR("Reply handling thread %d:%d Failed on starting: "
2643 "rc = %d\n", i, j, rc);
2644 ptlrpc_stop_hr_threads();
2650 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2652 struct l_wait_info lwi = { 0 };
2653 struct ptlrpc_thread *thread;
2654 CFS_LIST_HEAD (zombie);
2658 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2659 svcpt->scp_service->srv_name);
2661 spin_lock(&svcpt->scp_lock);
2662 /* let the thread know that we would like it to stop asap */
2663 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2664 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2665 svcpt->scp_service->srv_thread_name, thread->t_id);
2666 thread_add_flags(thread, SVC_STOPPING);
2669 cfs_waitq_broadcast(&svcpt->scp_waitq);
2671 while (!cfs_list_empty(&svcpt->scp_threads)) {
2672 thread = cfs_list_entry(svcpt->scp_threads.next,
2673 struct ptlrpc_thread, t_link);
2674 if (thread_is_stopped(thread)) {
2675 cfs_list_del(&thread->t_link);
2676 cfs_list_add(&thread->t_link, &zombie);
2679 spin_unlock(&svcpt->scp_lock);
2681 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2682 svcpt->scp_service->srv_thread_name, thread->t_id);
2683 l_wait_event(thread->t_ctl_waitq,
2684 thread_is_stopped(thread), &lwi);
2686 spin_lock(&svcpt->scp_lock);
2689 spin_unlock(&svcpt->scp_lock);
2691 while (!cfs_list_empty(&zombie)) {
2692 thread = cfs_list_entry(zombie.next,
2693 struct ptlrpc_thread, t_link);
2694 cfs_list_del(&thread->t_link);
2695 OBD_FREE_PTR(thread);
2701 * Stops all threads of a particular service \a svc
2703 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2705 struct ptlrpc_service_part *svcpt;
2709 ptlrpc_service_for_each_part(svcpt, i, svc) {
2710 if (svcpt->scp_service != NULL)
2711 ptlrpc_svcpt_stop_threads(svcpt);
2716 EXPORT_SYMBOL(ptlrpc_stop_all_threads);
2718 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2725 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2726 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2728 for (i = 0; i < svc->srv_ncpts; i++) {
2729 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2730 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2736 /* We have enough threads, don't start more. b=15759 */
2743 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2744 svc->srv_thread_name, i, j, rc);
2745 ptlrpc_stop_all_threads(svc);
2748 EXPORT_SYMBOL(ptlrpc_start_threads);
2750 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2752 struct l_wait_info lwi = { 0 };
2753 struct ptlrpc_thread *thread;
2754 struct ptlrpc_service *svc;
2758 LASSERT(svcpt != NULL);
2760 svc = svcpt->scp_service;
2762 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2763 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2764 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2767 if (unlikely(svc->srv_is_stopping))
2770 if (!ptlrpc_threads_increasable(svcpt) ||
2771 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2772 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2775 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
2778 cfs_waitq_init(&thread->t_ctl_waitq);
2780 spin_lock(&svcpt->scp_lock);
2781 if (!ptlrpc_threads_increasable(svcpt)) {
2782 spin_unlock(&svcpt->scp_lock);
2783 OBD_FREE_PTR(thread);
2787 if (svcpt->scp_nthrs_starting != 0) {
2788 /* serialize starting because some modules (obdfilter)
2789 * might require unique and contiguous t_id */
2790 LASSERT(svcpt->scp_nthrs_starting == 1);
2791 spin_unlock(&svcpt->scp_lock);
2792 OBD_FREE_PTR(thread);
2794 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2795 svc->srv_thread_name, svcpt->scp_thr_nextid);
2800 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2801 svc->srv_thread_name, svcpt->scp_thr_nextid);
2805 svcpt->scp_nthrs_starting++;
2806 thread->t_id = svcpt->scp_thr_nextid++;
2807 thread_add_flags(thread, SVC_STARTING);
2808 thread->t_svcpt = svcpt;
2810 cfs_list_add(&thread->t_link, &svcpt->scp_threads);
2811 spin_unlock(&svcpt->scp_lock);
2813 if (svcpt->scp_cpt >= 0) {
2814 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s%02d_%03d",
2815 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2817 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s_%04d",
2818 svc->srv_thread_name, thread->t_id);
2821 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2823 * CLONE_VM and CLONE_FILES just avoid a needless copy, because we
2824 * just drop the VM and FILES in cfs_daemonize_ctxt() right away.
2826 rc = cfs_create_thread(ptlrpc_main, thread, CFS_DAEMON_FLAGS);
2828 CERROR("cannot start thread '%s': rc %d\n",
2829 thread->t_name, rc);
2830 spin_lock(&svcpt->scp_lock);
2831 cfs_list_del(&thread->t_link);
2832 --svcpt->scp_nthrs_starting;
2833 spin_unlock(&svcpt->scp_lock);
2835 OBD_FREE(thread, sizeof(*thread));
2842 l_wait_event(thread->t_ctl_waitq,
2843 thread_is_running(thread) || thread_is_stopped(thread),
2846 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2850 int ptlrpc_hr_init(void)
2852 struct ptlrpc_hr_partition *hrp;
2853 struct ptlrpc_hr_thread *hrt;
2859 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2860 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2862 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2864 if (ptlrpc_hr.hr_partitions == NULL)
2867 cfs_waitq_init(&ptlrpc_hr.hr_waitq);
2869 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2872 cfs_atomic_set(&hrp->hrp_nstarted, 0);
2873 cfs_atomic_set(&hrp->hrp_nstopped, 0);
2875 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
2876 hrp->hrp_nthrs /= cfs_cpu_ht_nsiblings(0);
2878 LASSERT(hrp->hrp_nthrs > 0);
2879 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, i,
2880 hrp->hrp_nthrs * sizeof(*hrt));
2881 if (hrp->hrp_thrs == NULL)
2882 GOTO(out, rc = -ENOMEM);
2884 for (j = 0; j < hrp->hrp_nthrs; j++) {
2885 hrt = &hrp->hrp_thrs[j];
2888 hrt->hrt_partition = hrp;
2889 cfs_waitq_init(&hrt->hrt_waitq);
2890 spin_lock_init(&hrt->hrt_lock);
2891 CFS_INIT_LIST_HEAD(&hrt->hrt_queue);
2895 rc = ptlrpc_start_hr_threads();
2902 void ptlrpc_hr_fini(void)
2904 struct ptlrpc_hr_partition *hrp;
2907 if (ptlrpc_hr.hr_partitions == NULL)
2910 ptlrpc_stop_hr_threads();
2912 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2913 if (hrp->hrp_thrs != NULL) {
2914 OBD_FREE(hrp->hrp_thrs,
2915 hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
2919 cfs_percpt_free(ptlrpc_hr.hr_partitions);
2920 ptlrpc_hr.hr_partitions = NULL;
2923 #endif /* __KERNEL__ */
2926 * Wait until all already scheduled replies are processed.
2928 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
2932 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2935 rc = l_wait_event(svcpt->scp_waitq,
2936 cfs_atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
2939 CWARN("Unexpectedly long timeout %s %p\n",
2940 svcpt->scp_service->srv_name, svcpt->scp_service);
2945 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
2947 struct ptlrpc_service_part *svcpt;
2950 /* early disarm AT timer... */
2951 ptlrpc_service_for_each_part(svcpt, i, svc) {
2952 if (svcpt->scp_service != NULL)
2953 cfs_timer_disarm(&svcpt->scp_at_timer);
2958 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
2960 struct ptlrpc_service_part *svcpt;
2961 struct ptlrpc_request_buffer_desc *rqbd;
2962 struct l_wait_info lwi;
2966 /* All history will be culled when the next request buffer is
2967 * freed in ptlrpc_service_purge_all() */
2968 svc->srv_hist_nrqbds_cpt_max = 0;
2970 rc = LNetClearLazyPortal(svc->srv_req_portal);
2973 ptlrpc_service_for_each_part(svcpt, i, svc) {
2974 if (svcpt->scp_service == NULL)
2977 /* Unlink all the request buffers. This forces a 'final'
2978 * event with its 'unlink' flag set for each posted rqbd */
2979 cfs_list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
2981 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2982 LASSERT(rc == 0 || rc == -ENOENT);
2986 ptlrpc_service_for_each_part(svcpt, i, svc) {
2987 if (svcpt->scp_service == NULL)
2990 /* Wait for the network to release any buffers
2991 * it's currently filling */
2992 spin_lock(&svcpt->scp_lock);
2993 while (svcpt->scp_nrqbds_posted != 0) {
2994 spin_unlock(&svcpt->scp_lock);
2995 /* Network access will complete in finite time but
2996 * the HUGE timeout lets us CWARN for visibility
2997 * of sluggish NALs */
2998 lwi = LWI_TIMEOUT_INTERVAL(
2999 cfs_time_seconds(LONG_UNLINK),
3000 cfs_time_seconds(1), NULL, NULL);
3001 rc = l_wait_event(svcpt->scp_waitq,
3002 svcpt->scp_nrqbds_posted == 0, &lwi);
3003 if (rc == -ETIMEDOUT) {
3004 CWARN("Service %s waiting for "
3005 "request buffers\n",
3006 svcpt->scp_service->srv_name);
3008 spin_lock(&svcpt->scp_lock);
3010 spin_unlock(&svcpt->scp_lock);
3015 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
3017 struct ptlrpc_service_part *svcpt;
3018 struct ptlrpc_request_buffer_desc *rqbd;
3019 struct ptlrpc_request *req;
3020 struct ptlrpc_reply_state *rs;
3023 ptlrpc_service_for_each_part(svcpt, i, svc) {
3024 if (svcpt->scp_service == NULL)
3027 spin_lock(&svcpt->scp_rep_lock);
3028 while (!cfs_list_empty(&svcpt->scp_rep_active)) {
3029 rs = cfs_list_entry(svcpt->scp_rep_active.next,
3030 struct ptlrpc_reply_state, rs_list);
3031 spin_lock(&rs->rs_lock);
3032 ptlrpc_schedule_difficult_reply(rs);
3033 spin_unlock(&rs->rs_lock);
3035 spin_unlock(&svcpt->scp_rep_lock);
3037 /* purge the request queue. NB No new replies (rqbds
3038 * all unlinked) and no service threads, so I'm the only
3039 * thread noodling the request queue now */
3040 while (!cfs_list_empty(&svcpt->scp_req_incoming)) {
3041 req = cfs_list_entry(svcpt->scp_req_incoming.next,
3042 struct ptlrpc_request, rq_list);
3044 cfs_list_del(&req->rq_list);
3045 svcpt->scp_nreqs_incoming--;
3046 svcpt->scp_nreqs_active++;
3047 ptlrpc_server_finish_request(svcpt, req);
3050 while (ptlrpc_server_request_pending(svcpt, 1)) {
3051 req = ptlrpc_server_request_get(svcpt, 1);
3052 ptlrpc_nrs_req_del_nolock(req);
3053 svcpt->scp_nreqs_active++;
3054 ptlrpc_server_hpreq_fini(req);
3056 if (req->rq_export != NULL)
3057 class_export_rpc_put(req->rq_export);
3058 ptlrpc_server_finish_request(svcpt, req);
3061 LASSERT(cfs_list_empty(&svcpt->scp_rqbd_posted));
3062 LASSERT(svcpt->scp_nreqs_incoming == 0);
3063 LASSERT(svcpt->scp_nreqs_active == 0);
3064 /* history should have been culled by
3065 * ptlrpc_server_finish_request */
3066 LASSERT(svcpt->scp_hist_nrqbds == 0);
3068 /* Now free all the request buffers since nothing
3069 * references them any more... */
3071 while (!cfs_list_empty(&svcpt->scp_rqbd_idle)) {
3072 rqbd = cfs_list_entry(svcpt->scp_rqbd_idle.next,
3073 struct ptlrpc_request_buffer_desc,
3075 ptlrpc_free_rqbd(rqbd);
3077 ptlrpc_wait_replies(svcpt);
3079 while (!cfs_list_empty(&svcpt->scp_rep_idle)) {
3080 rs = cfs_list_entry(svcpt->scp_rep_idle.next,
3081 struct ptlrpc_reply_state,
3083 cfs_list_del(&rs->rs_list);
3084 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
3090 ptlrpc_service_free(struct ptlrpc_service *svc)
3092 struct ptlrpc_service_part *svcpt;
3093 struct ptlrpc_at_array *array;
3096 ptlrpc_service_for_each_part(svcpt, i, svc) {
3097 if (svcpt->scp_service == NULL)
3100 /* In case somebody rearmed this in the meantime */
3101 cfs_timer_disarm(&svcpt->scp_at_timer);
3102 array = &svcpt->scp_at_array;
3104 if (array->paa_reqs_array != NULL) {
3105 OBD_FREE(array->paa_reqs_array,
3106 sizeof(cfs_list_t) * array->paa_size);
3107 array->paa_reqs_array = NULL;
3110 if (array->paa_reqs_count != NULL) {
3111 OBD_FREE(array->paa_reqs_count,
3112 sizeof(__u32) * array->paa_size);
3113 array->paa_reqs_count = NULL;
3117 ptlrpc_service_for_each_part(svcpt, i, svc)
3118 OBD_FREE_PTR(svcpt);
3120 if (svc->srv_cpts != NULL)
3121 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3123 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3124 srv_parts[svc->srv_ncpts]));
3127 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3131 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3133 service->srv_is_stopping = 1;
3135 mutex_lock(&ptlrpc_all_services_mutex);
3136 cfs_list_del_init(&service->srv_list);
3137 mutex_unlock(&ptlrpc_all_services_mutex);
3139 ptlrpc_service_del_atimer(service);
3140 ptlrpc_stop_all_threads(service);
3142 ptlrpc_service_unlink_rqbd(service);
3143 ptlrpc_service_purge_all(service);
3144 ptlrpc_service_nrs_cleanup(service);
3146 ptlrpc_lprocfs_unregister_service(service);
3148 ptlrpc_service_free(service);
3152 EXPORT_SYMBOL(ptlrpc_unregister_service);
3155 * Returns 0 if the service is healthy.
3157 * Right now, it just checks to make sure that requests aren't languishing
3158 * in the queue. We'll use this health check to govern whether a node needs
3159 * to be shot, so it's intentionally non-aggressive. */
3160 int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3162 struct ptlrpc_request *request;
3163 struct timeval right_now;
3166 cfs_gettimeofday(&right_now);
3168 spin_lock(&svcpt->scp_req_lock);
3169 if (!ptlrpc_server_request_pending(svcpt, 1)) {
3170 spin_unlock(&svcpt->scp_req_lock);
3174 /* How long has the next entry been waiting? */
3175 request = ptlrpc_nrs_req_poll_nolock(svcpt, true);
3176 if (request == NULL)
3177 request = ptlrpc_nrs_req_poll_nolock(svcpt, false);
3179 timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
3180 spin_unlock(&svcpt->scp_req_lock);
3182 if ((timediff / ONE_MILLION) >
3183 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3184 CERROR("%s: unhealthy - request has been waiting %lds\n",
3185 svcpt->scp_service->srv_name, timediff / ONE_MILLION);
3193 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3195 struct ptlrpc_service_part *svcpt;
3198 if (svc == NULL || svc->srv_parts == NULL)
3201 ptlrpc_service_for_each_part(svcpt, i, svc) {
3202 int rc = ptlrpc_svcpt_health_check(svcpt);
3209 EXPORT_SYMBOL(ptlrpc_service_health_check);