4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2010, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #define DEBUG_SUBSYSTEM S_RPC
34 #include <linux/kthread.h>
35 #include <obd_support.h>
36 #include <obd_class.h>
37 #include <lustre_net.h>
38 #include <lu_object.h>
39 #include <lnet/types.h>
40 #include "ptlrpc_internal.h"
42 /* The following are visible and mutable through /sys/module/ptlrpc */
43 int test_req_buffer_pressure = 0;
44 module_param(test_req_buffer_pressure, int, 0444);
45 MODULE_PARM_DESC(test_req_buffer_pressure, "set non-zero to put pressure on request buffer pools");
46 module_param(at_min, int, 0644);
47 MODULE_PARM_DESC(at_min, "Adaptive timeout minimum (sec)");
48 module_param(at_max, int, 0644);
49 MODULE_PARM_DESC(at_max, "Adaptive timeout maximum (sec)");
50 module_param(at_history, int, 0644);
51 MODULE_PARM_DESC(at_history,
52 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
53 module_param(at_early_margin, int, 0644);
54 MODULE_PARM_DESC(at_early_margin, "How soon before an RPC deadline to send an early reply");
55 module_param(at_extra, int, 0644);
56 MODULE_PARM_DESC(at_extra, "How much extra time to give with each early reply");
59 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt);
60 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req);
61 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req);
63 /** Holds a list of all PTLRPC services */
64 struct list_head ptlrpc_all_services;
65 /** Used to protect the \e ptlrpc_all_services list */
66 struct mutex ptlrpc_all_services_mutex;
68 static struct ptlrpc_request_buffer_desc *
69 ptlrpc_alloc_rqbd(struct ptlrpc_service_part *svcpt)
71 struct ptlrpc_service *svc = svcpt->scp_service;
72 struct ptlrpc_request_buffer_desc *rqbd;
74 OBD_CPT_ALLOC_PTR(rqbd, svc->srv_cptable, svcpt->scp_cpt);
78 rqbd->rqbd_svcpt = svcpt;
79 rqbd->rqbd_refcount = 0;
80 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
81 rqbd->rqbd_cbid.cbid_arg = rqbd;
82 INIT_LIST_HEAD(&rqbd->rqbd_reqs);
83 OBD_CPT_ALLOC_LARGE(rqbd->rqbd_buffer, svc->srv_cptable,
84 svcpt->scp_cpt, svc->srv_buf_size);
85 if (rqbd->rqbd_buffer == NULL) {
90 spin_lock(&svcpt->scp_lock);
91 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
92 svcpt->scp_nrqbds_total++;
93 spin_unlock(&svcpt->scp_lock);
99 ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
101 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
103 LASSERT(rqbd->rqbd_refcount == 0);
104 LASSERT(list_empty(&rqbd->rqbd_reqs));
106 spin_lock(&svcpt->scp_lock);
107 list_del(&rqbd->rqbd_list);
108 svcpt->scp_nrqbds_total--;
109 spin_unlock(&svcpt->scp_lock);
111 OBD_FREE_LARGE(rqbd->rqbd_buffer, svcpt->scp_service->srv_buf_size);
116 ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
118 struct ptlrpc_service *svc = svcpt->scp_service;
119 struct ptlrpc_request_buffer_desc *rqbd;
123 if (svcpt->scp_rqbd_allocating)
126 spin_lock(&svcpt->scp_lock);
127 /* check again with lock */
128 if (svcpt->scp_rqbd_allocating) {
129 /* NB: we might allow more than one thread in the future */
130 LASSERT(svcpt->scp_rqbd_allocating == 1);
131 spin_unlock(&svcpt->scp_lock);
135 svcpt->scp_rqbd_allocating++;
136 spin_unlock(&svcpt->scp_lock);
139 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
140 /* NB: another thread might have recycled enough rqbds, we
141 * need to make sure it wouldn't over-allocate, see LU-1212. */
142 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group)
145 rqbd = ptlrpc_alloc_rqbd(svcpt);
148 CERROR("%s: Can't allocate request buffer\n",
155 spin_lock(&svcpt->scp_lock);
157 LASSERT(svcpt->scp_rqbd_allocating == 1);
158 svcpt->scp_rqbd_allocating--;
160 spin_unlock(&svcpt->scp_lock);
163 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
164 svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted,
165 svcpt->scp_nrqbds_total, rc);
169 rc = ptlrpc_server_post_idle_rqbds(svcpt);
175 * Part of Rep-Ack logic.
176 * Puts a lock and its mode into reply state assotiated to request reply.
179 ptlrpc_save_lock(struct ptlrpc_request *req, struct lustre_handle *lock,
180 int mode, bool no_ack, bool convert_lock)
182 struct ptlrpc_reply_state *rs = req->rq_reply_state;
186 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
188 idx = rs->rs_nlocks++;
189 rs->rs_locks[idx] = *lock;
190 rs->rs_modes[idx] = mode;
191 rs->rs_difficult = 1;
192 rs->rs_no_ack = no_ack;
193 rs->rs_convert_lock = convert_lock;
195 EXPORT_SYMBOL(ptlrpc_save_lock);
198 struct ptlrpc_hr_partition;
200 struct ptlrpc_hr_thread {
201 int hrt_id; /* thread ID */
203 wait_queue_head_t hrt_waitq;
204 struct list_head hrt_queue;
205 struct ptlrpc_hr_partition *hrt_partition;
208 struct ptlrpc_hr_partition {
209 /* # of started threads */
210 atomic_t hrp_nstarted;
211 /* # of stopped threads */
212 atomic_t hrp_nstopped;
213 /* cpu partition id */
215 /* round-robin rotor for choosing thread */
217 /* total number of threads on this partition */
220 struct ptlrpc_hr_thread *hrp_thrs;
223 #define HRT_RUNNING 0
224 #define HRT_STOPPING 1
226 struct ptlrpc_hr_service {
227 /* CPU partition table, it's just cfs_cpt_table for now */
228 struct cfs_cpt_table *hr_cpt_table;
229 /** controller sleep waitq */
230 wait_queue_head_t hr_waitq;
231 unsigned int hr_stopping;
232 /** roundrobin rotor for non-affinity service */
233 unsigned int hr_rotor;
235 struct ptlrpc_hr_partition **hr_partitions;
239 struct list_head rsb_replies;
240 unsigned int rsb_n_replies;
241 struct ptlrpc_service_part *rsb_svcpt;
244 /** reply handling service. */
245 static struct ptlrpc_hr_service ptlrpc_hr;
248 * maximum mumber of replies scheduled in one batch
250 #define MAX_SCHEDULED 256
253 * Initialize a reply batch.
257 static void rs_batch_init(struct rs_batch *b)
259 memset(b, 0, sizeof *b);
260 INIT_LIST_HEAD(&b->rsb_replies);
264 * Choose an hr thread to dispatch requests to.
266 static struct ptlrpc_hr_thread *
267 ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
269 struct ptlrpc_hr_partition *hrp;
272 if (svcpt->scp_cpt >= 0 &&
273 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
274 /* directly match partition */
275 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
278 rotor = ptlrpc_hr.hr_rotor++;
279 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
281 hrp = ptlrpc_hr.hr_partitions[rotor];
284 rotor = hrp->hrp_rotor++;
285 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
289 * Dispatch all replies accumulated in the batch to one from
290 * dedicated reply handling threads.
294 static void rs_batch_dispatch(struct rs_batch *b)
296 if (b->rsb_n_replies != 0) {
297 struct ptlrpc_hr_thread *hrt;
299 hrt = ptlrpc_hr_select(b->rsb_svcpt);
301 spin_lock(&hrt->hrt_lock);
302 list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
303 spin_unlock(&hrt->hrt_lock);
305 wake_up(&hrt->hrt_waitq);
306 b->rsb_n_replies = 0;
311 * Add a reply to a batch.
312 * Add one reply object to a batch, schedule batched replies if overload.
317 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
319 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
321 if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
322 if (b->rsb_svcpt != NULL) {
323 rs_batch_dispatch(b);
324 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
326 spin_lock(&svcpt->scp_rep_lock);
327 b->rsb_svcpt = svcpt;
329 spin_lock(&rs->rs_lock);
330 rs->rs_scheduled_ever = 1;
331 if (rs->rs_scheduled == 0) {
332 list_move(&rs->rs_list, &b->rsb_replies);
333 rs->rs_scheduled = 1;
336 rs->rs_committed = 1;
337 spin_unlock(&rs->rs_lock);
341 * Reply batch finalization.
342 * Dispatch remaining replies from the batch
343 * and release remaining spinlock.
347 static void rs_batch_fini(struct rs_batch *b)
349 if (b->rsb_svcpt != NULL) {
350 rs_batch_dispatch(b);
351 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
355 #define DECLARE_RS_BATCH(b) struct rs_batch b
359 * Put reply state into a queue for processing because we received
360 * ACK from the client
362 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
364 struct ptlrpc_hr_thread *hrt;
367 LASSERT(list_empty(&rs->rs_list));
369 hrt = ptlrpc_hr_select(rs->rs_svcpt);
371 spin_lock(&hrt->hrt_lock);
372 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
373 spin_unlock(&hrt->hrt_lock);
375 wake_up(&hrt->hrt_waitq);
380 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
384 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
385 assert_spin_locked(&rs->rs_lock);
386 LASSERT (rs->rs_difficult);
387 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
389 if (rs->rs_scheduled) { /* being set up or already notified */
394 rs->rs_scheduled = 1;
395 list_del_init(&rs->rs_list);
396 ptlrpc_dispatch_difficult_reply(rs);
399 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
401 void ptlrpc_commit_replies(struct obd_export *exp)
403 struct ptlrpc_reply_state *rs, *nxt;
404 DECLARE_RS_BATCH(batch);
407 rs_batch_init(&batch);
408 /* Find any replies that have been committed and get their service
409 * to attend to complete them. */
411 /* CAVEAT EMPTOR: spinlock ordering!!! */
412 spin_lock(&exp->exp_uncommitted_replies_lock);
413 list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
415 LASSERT (rs->rs_difficult);
416 /* VBR: per-export last_committed */
417 LASSERT(rs->rs_export);
418 if (rs->rs_transno <= exp->exp_last_committed) {
419 list_del_init(&rs->rs_obd_list);
420 rs_batch_add(&batch, rs);
423 spin_unlock(&exp->exp_uncommitted_replies_lock);
424 rs_batch_fini(&batch);
429 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
431 struct ptlrpc_request_buffer_desc *rqbd;
436 spin_lock(&svcpt->scp_lock);
438 if (list_empty(&svcpt->scp_rqbd_idle)) {
439 spin_unlock(&svcpt->scp_lock);
443 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
444 struct ptlrpc_request_buffer_desc,
446 list_del(&rqbd->rqbd_list);
448 /* assume we will post successfully */
449 svcpt->scp_nrqbds_posted++;
450 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
452 spin_unlock(&svcpt->scp_lock);
454 rc = ptlrpc_register_rqbd(rqbd);
461 spin_lock(&svcpt->scp_lock);
463 svcpt->scp_nrqbds_posted--;
464 list_del(&rqbd->rqbd_list);
465 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
467 /* Don't complain if no request buffers are posted right now; LNET
468 * won't drop requests because we set the portal lazy! */
470 spin_unlock(&svcpt->scp_lock);
475 static void ptlrpc_at_timer(unsigned long castmeharder)
477 struct ptlrpc_service_part *svcpt;
479 svcpt = (struct ptlrpc_service_part *)castmeharder;
481 svcpt->scp_at_check = 1;
482 svcpt->scp_at_checktime = cfs_time_current();
483 wake_up(&svcpt->scp_waitq);
487 ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
488 struct ptlrpc_service_conf *conf)
490 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
497 * Common code for estimating & validating threads number.
498 * CPT affinity service could have percpt thread-pool instead
499 * of a global thread-pool, which means user might not always
500 * get the threads number they give it in conf::tc_nthrs_user
501 * even they did set. It's because we need to validate threads
502 * number for each CPT to guarantee each pool will have enough
503 * threads to keep the service healthy.
505 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
506 init = max_t(int, init, tc->tc_nthrs_init);
508 /* NB: please see comments in lustre_lnet.h for definition
509 * details of these members */
510 LASSERT(tc->tc_nthrs_max != 0);
512 if (tc->tc_nthrs_user != 0) {
513 /* In case there is a reason to test a service with many
514 * threads, we give a less strict check here, it can
515 * be up to 8 * nthrs_max */
516 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
517 nthrs = total / svc->srv_ncpts;
518 init = max(init, nthrs);
522 total = tc->tc_nthrs_max;
523 if (tc->tc_nthrs_base == 0) {
524 /* don't care about base threads number per partition,
525 * this is most for non-affinity service */
526 nthrs = total / svc->srv_ncpts;
530 nthrs = tc->tc_nthrs_base;
531 if (svc->srv_ncpts == 1) {
534 /* NB: Increase the base number if it's single partition
535 * and total number of cores/HTs is larger or equal to 4.
536 * result will always < 2 * nthrs_base */
537 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
538 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
539 (tc->tc_nthrs_base >> i) != 0; i++)
540 nthrs += tc->tc_nthrs_base >> i;
543 if (tc->tc_thr_factor != 0) {
544 int factor = tc->tc_thr_factor;
548 * User wants to increase number of threads with for
549 * each CPU core/HT, most likely the factor is larger than
550 * one thread/core because service threads are supposed to
551 * be blocked by lock or wait for IO.
554 * Amdahl's law says that adding processors wouldn't give
555 * a linear increasing of parallelism, so it's nonsense to
556 * have too many threads no matter how many cores/HTs
559 if (cpumask_weight(topology_sibling_cpumask(smp_processor_id())) > 1) {
560 /* weight is # of HTs */
561 /* depress thread factor for hyper-thread */
562 factor = factor - (factor >> 1) + (factor >> 3);
565 weight = cfs_cpt_weight(svc->srv_cptable, 0);
567 for (; factor > 0 && weight > 0; factor--, weight -= fade)
568 nthrs += min(weight, fade) * factor;
571 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
572 nthrs = max(tc->tc_nthrs_base,
573 tc->tc_nthrs_max / svc->srv_ncpts);
576 nthrs = max(nthrs, tc->tc_nthrs_init);
577 svc->srv_nthrs_cpt_limit = nthrs;
578 svc->srv_nthrs_cpt_init = init;
580 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
581 CDEBUG(D_OTHER, "%s: This service may have more threads (%d) "
582 "than the given soft limit (%d)\n",
583 svc->srv_name, nthrs * svc->srv_ncpts,
589 * Initialize percpt data for a service
592 ptlrpc_service_part_init(struct ptlrpc_service *svc,
593 struct ptlrpc_service_part *svcpt, int cpt)
595 struct ptlrpc_at_array *array;
600 svcpt->scp_cpt = cpt;
601 INIT_LIST_HEAD(&svcpt->scp_threads);
603 /* rqbd and incoming request queue */
604 spin_lock_init(&svcpt->scp_lock);
605 INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
606 INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
607 INIT_LIST_HEAD(&svcpt->scp_req_incoming);
608 init_waitqueue_head(&svcpt->scp_waitq);
609 /* history request & rqbd list */
610 INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
611 INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
613 /* acitve requests and hp requests */
614 spin_lock_init(&svcpt->scp_req_lock);
617 spin_lock_init(&svcpt->scp_rep_lock);
618 INIT_LIST_HEAD(&svcpt->scp_rep_active);
619 INIT_LIST_HEAD(&svcpt->scp_rep_idle);
620 init_waitqueue_head(&svcpt->scp_rep_waitq);
621 atomic_set(&svcpt->scp_nreps_difficult, 0);
623 /* adaptive timeout */
624 spin_lock_init(&svcpt->scp_at_lock);
625 array = &svcpt->scp_at_array;
627 size = at_est2timeout(at_max);
628 array->paa_size = size;
629 array->paa_count = 0;
630 array->paa_deadline = -1;
632 /* allocate memory for scp_at_array (ptlrpc_at_array) */
633 OBD_CPT_ALLOC(array->paa_reqs_array,
634 svc->srv_cptable, cpt, sizeof(struct list_head) * size);
635 if (array->paa_reqs_array == NULL)
638 for (index = 0; index < size; index++)
639 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
641 OBD_CPT_ALLOC(array->paa_reqs_count,
642 svc->srv_cptable, cpt, sizeof(__u32) * size);
643 if (array->paa_reqs_count == NULL)
646 setup_timer(&svcpt->scp_at_timer, ptlrpc_at_timer,
647 (unsigned long)svcpt);
649 /* At SOW, service time should be quick; 10s seems generous. If client
650 * timeout is less than this, we'll be sending an early reply. */
651 at_init(&svcpt->scp_at_estimate, 10, 0);
653 /* assign this before call ptlrpc_grow_req_bufs */
654 svcpt->scp_service = svc;
655 /* Now allocate the request buffers, but don't post them now */
656 rc = ptlrpc_grow_req_bufs(svcpt, 0);
657 /* We shouldn't be under memory pressure at startup, so
658 * fail if we can't allocate all our buffers at this time. */
665 if (array->paa_reqs_count != NULL) {
666 OBD_FREE(array->paa_reqs_count, sizeof(__u32) * size);
667 array->paa_reqs_count = NULL;
670 if (array->paa_reqs_array != NULL) {
671 OBD_FREE(array->paa_reqs_array,
672 sizeof(struct list_head) * array->paa_size);
673 array->paa_reqs_array = NULL;
680 * Initialize service on a given portal.
681 * This includes starting serving threads , allocating and posting rqbds and
684 struct ptlrpc_service *
685 ptlrpc_register_service(struct ptlrpc_service_conf *conf,
687 struct proc_dir_entry *proc_entry)
689 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
690 struct ptlrpc_service *service;
691 struct ptlrpc_service_part *svcpt;
692 struct cfs_cpt_table *cptable;
700 LASSERT(conf->psc_buf.bc_nbufs > 0);
701 LASSERT(conf->psc_buf.bc_buf_size >=
702 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
703 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
705 cptable = cconf->cc_cptable;
707 cptable = cfs_cpt_table;
709 if (!conf->psc_thr.tc_cpu_affinity) {
712 ncpts = cfs_cpt_number(cptable);
713 if (cconf->cc_pattern != NULL) {
714 struct cfs_expr_list *el;
716 rc = cfs_expr_list_parse(cconf->cc_pattern,
717 strlen(cconf->cc_pattern),
720 CERROR("%s: invalid CPT pattern string: %s",
721 conf->psc_name, cconf->cc_pattern);
722 RETURN(ERR_PTR(-EINVAL));
725 rc = cfs_expr_list_values(el, ncpts, &cpts);
726 cfs_expr_list_free(el);
728 CERROR("%s: failed to parse CPT array %s: %d\n",
729 conf->psc_name, cconf->cc_pattern, rc);
731 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
732 RETURN(ERR_PTR(rc < 0 ? rc : -EINVAL));
738 OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
739 if (service == NULL) {
741 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
742 RETURN(ERR_PTR(-ENOMEM));
745 service->srv_cptable = cptable;
746 service->srv_cpts = cpts;
747 service->srv_ncpts = ncpts;
749 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
750 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
751 service->srv_cpt_bits++;
754 spin_lock_init(&service->srv_lock);
755 service->srv_name = conf->psc_name;
756 service->srv_watchdog_factor = conf->psc_watchdog_factor;
757 INIT_LIST_HEAD(&service->srv_list); /* for safty of cleanup */
759 /* buffer configuration */
760 service->srv_nbuf_per_group = test_req_buffer_pressure ?
761 1 : conf->psc_buf.bc_nbufs;
762 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
764 service->srv_buf_size = conf->psc_buf.bc_buf_size;
765 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
766 service->srv_req_portal = conf->psc_buf.bc_req_portal;
768 /* Increase max reply size to next power of two */
769 service->srv_max_reply_size = 1;
770 while (service->srv_max_reply_size <
771 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
772 service->srv_max_reply_size <<= 1;
774 service->srv_thread_name = conf->psc_thr.tc_thr_name;
775 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
776 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
777 service->srv_ops = conf->psc_ops;
779 for (i = 0; i < ncpts; i++) {
780 if (!conf->psc_thr.tc_cpu_affinity)
783 cpt = cpts != NULL ? cpts[i] : i;
785 OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
787 GOTO(failed, rc = -ENOMEM);
789 service->srv_parts[i] = svcpt;
790 rc = ptlrpc_service_part_init(service, svcpt, cpt);
795 ptlrpc_server_nthreads_check(service, conf);
797 rc = LNetSetLazyPortal(service->srv_req_portal);
800 mutex_lock(&ptlrpc_all_services_mutex);
801 list_add(&service->srv_list, &ptlrpc_all_services);
802 mutex_unlock(&ptlrpc_all_services_mutex);
805 rc = ptlrpc_sysfs_register_service(parent, service);
810 if (proc_entry != NULL)
811 ptlrpc_lprocfs_register_service(proc_entry, service);
813 rc = ptlrpc_service_nrs_setup(service);
817 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
818 service->srv_name, service->srv_req_portal);
820 rc = ptlrpc_start_threads(service);
822 CERROR("Failed to start threads for service %s: %d\n",
823 service->srv_name, rc);
829 ptlrpc_unregister_service(service);
832 EXPORT_SYMBOL(ptlrpc_register_service);
835 * to actually free the request, must be called without holding svc_lock.
836 * note it's caller's responsibility to unlink req->rq_list.
838 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
840 LASSERT(atomic_read(&req->rq_refcount) == 0);
841 LASSERT(list_empty(&req->rq_timed_list));
843 /* DEBUG_REQ() assumes the reply state of a request with a valid
844 * ref will not be destroyed until that reference is dropped. */
845 ptlrpc_req_drop_rs(req);
847 sptlrpc_svc_ctx_decref(req);
849 if (req != &req->rq_rqbd->rqbd_req) {
850 /* NB request buffers use an embedded
851 * req if the incoming req unlinked the
852 * MD; this isn't one of them! */
853 ptlrpc_request_cache_free(req);
858 * drop a reference count of the request. if it reaches 0, we either
859 * put it into history list, or free it immediately.
861 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
863 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
864 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
865 struct ptlrpc_service *svc = svcpt->scp_service;
867 struct list_head *tmp;
868 struct list_head *nxt;
870 if (!atomic_dec_and_test(&req->rq_refcount))
873 if (req->rq_session.lc_state == LCS_ENTERED) {
874 lu_context_exit(&req->rq_session);
875 lu_context_fini(&req->rq_session);
878 if (req->rq_at_linked) {
879 spin_lock(&svcpt->scp_at_lock);
880 /* recheck with lock, in case it's unlinked by
881 * ptlrpc_at_check_timed() */
882 if (likely(req->rq_at_linked))
883 ptlrpc_at_remove_timed(req);
884 spin_unlock(&svcpt->scp_at_lock);
887 LASSERT(list_empty(&req->rq_timed_list));
889 /* finalize request */
890 if (req->rq_export) {
891 class_export_put(req->rq_export);
892 req->rq_export = NULL;
895 spin_lock(&svcpt->scp_lock);
897 list_add(&req->rq_list, &rqbd->rqbd_reqs);
899 refcount = --(rqbd->rqbd_refcount);
901 /* request buffer is now idle: add to history */
902 list_del(&rqbd->rqbd_list);
904 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
905 svcpt->scp_hist_nrqbds++;
907 /* cull some history?
908 * I expect only about 1 or 2 rqbds need to be recycled here */
909 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
910 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
911 struct ptlrpc_request_buffer_desc,
914 list_del(&rqbd->rqbd_list);
915 svcpt->scp_hist_nrqbds--;
917 /* remove rqbd's reqs from svc's req history while
918 * I've got the service lock */
919 list_for_each(tmp, &rqbd->rqbd_reqs) {
920 req = list_entry(tmp, struct ptlrpc_request,
922 /* Track the highest culled req seq */
923 if (req->rq_history_seq >
924 svcpt->scp_hist_seq_culled) {
925 svcpt->scp_hist_seq_culled =
928 list_del(&req->rq_history_list);
931 spin_unlock(&svcpt->scp_lock);
933 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
934 req = list_entry(rqbd->rqbd_reqs.next,
935 struct ptlrpc_request,
937 list_del(&req->rq_list);
938 ptlrpc_server_free_request(req);
941 spin_lock(&svcpt->scp_lock);
943 * now all reqs including the embedded req has been
944 * disposed, schedule request buffer for re-use
945 * or free it to drain some in excess.
947 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == 0);
948 if (svcpt->scp_nrqbds_posted >=
949 svc->srv_nbuf_per_group &&
950 !test_req_buffer_pressure) {
951 /* like in ptlrpc_free_rqbd() */
952 svcpt->scp_nrqbds_total--;
953 OBD_FREE_LARGE(rqbd->rqbd_buffer,
957 list_add_tail(&rqbd->rqbd_list,
958 &svcpt->scp_rqbd_idle);
962 spin_unlock(&svcpt->scp_lock);
963 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
964 /* If we are low on memory, we are not interested in history */
965 list_del(&req->rq_list);
966 list_del_init(&req->rq_history_list);
968 /* Track the highest culled req seq */
969 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
970 svcpt->scp_hist_seq_culled = req->rq_history_seq;
972 spin_unlock(&svcpt->scp_lock);
974 ptlrpc_server_free_request(req);
976 spin_unlock(&svcpt->scp_lock);
980 /** Change request export and move hp request from old export to new */
981 void ptlrpc_request_change_export(struct ptlrpc_request *req,
982 struct obd_export *export)
984 if (req->rq_export != NULL) {
985 LASSERT(!list_empty(&req->rq_exp_list));
986 /* remove rq_exp_list from last export */
987 spin_lock_bh(&req->rq_export->exp_rpc_lock);
988 list_del_init(&req->rq_exp_list);
989 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
990 /* export has one reference already, so it`s safe to
991 * add req to export queue here and get another
992 * reference for request later */
993 spin_lock_bh(&export->exp_rpc_lock);
994 if (req->rq_ops != NULL) /* hp request */
995 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
997 list_add(&req->rq_exp_list, &export->exp_reg_rpcs);
998 spin_unlock_bh(&export->exp_rpc_lock);
1000 class_export_rpc_dec(req->rq_export);
1001 class_export_put(req->rq_export);
1004 /* request takes one export refcount */
1005 req->rq_export = class_export_get(export);
1006 class_export_rpc_inc(export);
1012 * to finish a request: stop sending more early replies, and release
1015 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
1016 struct ptlrpc_request *req)
1018 ptlrpc_server_hpreq_fini(req);
1020 ptlrpc_server_drop_request(req);
1024 * to finish an active request: stop sending more early replies, and release
1025 * the request. should be called after we finished handling the request.
1027 static void ptlrpc_server_finish_active_request(
1028 struct ptlrpc_service_part *svcpt,
1029 struct ptlrpc_request *req)
1031 spin_lock(&svcpt->scp_req_lock);
1032 ptlrpc_nrs_req_stop_nolock(req);
1033 svcpt->scp_nreqs_active--;
1035 svcpt->scp_nhreqs_active--;
1036 spin_unlock(&svcpt->scp_req_lock);
1038 ptlrpc_nrs_req_finalize(req);
1040 if (req->rq_export != NULL)
1041 class_export_rpc_dec(req->rq_export);
1043 ptlrpc_server_finish_request(svcpt, req);
1047 * This function makes sure dead exports are evicted in a timely manner.
1048 * This function is only called when some export receives a message (i.e.,
1049 * the network is up.)
1051 void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
1053 struct obd_export *oldest_exp;
1054 time_t oldest_time, new_time;
1060 /* Compensate for slow machines, etc, by faking our request time
1061 into the future. Although this can break the strict time-ordering
1062 of the list, we can be really lazy here - we don't have to evict
1063 at the exact right moment. Eventually, all silent exports
1064 will make it to the top of the list. */
1066 /* Do not pay attention on 1sec or smaller renewals. */
1067 new_time = cfs_time_current_sec() + extra_delay;
1068 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1071 exp->exp_last_request_time = new_time;
1073 /* exports may get disconnected from the chain even though the
1074 export has references, so we must keep the spin lock while
1075 manipulating the lists */
1076 spin_lock(&exp->exp_obd->obd_dev_lock);
1078 if (list_empty(&exp->exp_obd_chain_timed)) {
1079 /* this one is not timed */
1080 spin_unlock(&exp->exp_obd->obd_dev_lock);
1084 list_move_tail(&exp->exp_obd_chain_timed,
1085 &exp->exp_obd->obd_exports_timed);
1087 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1088 struct obd_export, exp_obd_chain_timed);
1089 oldest_time = oldest_exp->exp_last_request_time;
1090 spin_unlock(&exp->exp_obd->obd_dev_lock);
1092 if (exp->exp_obd->obd_recovering) {
1093 /* be nice to everyone during recovery */
1098 /* Note - racing to start/reset the obd_eviction timer is safe */
1099 if (exp->exp_obd->obd_eviction_timer == 0) {
1100 /* Check if the oldest entry is expired. */
1101 if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
1103 /* We need a second timer, in case the net was down and
1104 * it just came back. Since the pinger may skip every
1105 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1106 * we better wait for 3. */
1107 exp->exp_obd->obd_eviction_timer =
1108 cfs_time_current_sec() + 3 * PING_INTERVAL;
1109 CDEBUG(D_HA, "%s: Think about evicting %s from %ld\n",
1110 exp->exp_obd->obd_name,
1111 obd_export_nid2str(oldest_exp), oldest_time);
1114 if (cfs_time_current_sec() >
1115 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1116 /* The evictor won't evict anyone who we've heard from
1117 * recently, so we don't have to check before we start
1119 if (!ping_evictor_wake(exp))
1120 exp->exp_obd->obd_eviction_timer = 0;
1128 * Sanity check request \a req.
1129 * Return 0 if all is ok, error code otherwise.
1131 static int ptlrpc_check_req(struct ptlrpc_request *req)
1133 struct obd_device *obd = req->rq_export->exp_obd;
1136 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1137 req->rq_export->exp_conn_cnt)) {
1138 DEBUG_REQ(D_RPCTRACE, req,
1139 "DROPPING req from old connection %d < %d",
1140 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1141 req->rq_export->exp_conn_cnt);
1144 if (unlikely(obd == NULL || obd->obd_fail)) {
1145 /* Failing over, don't handle any more reqs,
1146 * send error response instead. */
1147 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1148 req, (obd != NULL) ? obd->obd_name : "unknown");
1150 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1151 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1152 !obd->obd_recovering) {
1153 DEBUG_REQ(D_ERROR, req,
1154 "Invalid replay without recovery");
1155 class_fail_export(req->rq_export);
1157 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1158 !obd->obd_recovering) {
1159 DEBUG_REQ(D_ERROR, req, "Invalid req with transno "
1160 "%llu without recovery",
1161 lustre_msg_get_transno(req->rq_reqmsg));
1162 class_fail_export(req->rq_export);
1166 if (unlikely(rc < 0)) {
1167 req->rq_status = rc;
1173 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1175 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1178 if (array->paa_count == 0) {
1179 del_timer(&svcpt->scp_at_timer);
1183 /* Set timer for closest deadline */
1184 next = (__s32)(array->paa_deadline - ktime_get_real_seconds() -
1187 ptlrpc_at_timer((unsigned long)svcpt);
1189 mod_timer(&svcpt->scp_at_timer, cfs_time_shift(next));
1190 CDEBUG(D_INFO, "armed %s at %+ds\n",
1191 svcpt->scp_service->srv_name, next);
1195 /* Add rpc to early reply check list */
1196 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1198 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1199 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1200 struct ptlrpc_request *rq = NULL;
1206 if (req->rq_no_reply)
1209 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1212 spin_lock(&svcpt->scp_at_lock);
1213 LASSERT(list_empty(&req->rq_timed_list));
1215 div_u64_rem(req->rq_deadline, array->paa_size, &index);
1216 if (array->paa_reqs_count[index] > 0) {
1217 /* latest rpcs will have the latest deadlines in the list,
1218 * so search backward. */
1219 list_for_each_entry_reverse(rq,
1220 &array->paa_reqs_array[index],
1222 if (req->rq_deadline >= rq->rq_deadline) {
1223 list_add(&req->rq_timed_list,
1224 &rq->rq_timed_list);
1230 /* Add the request at the head of the list */
1231 if (list_empty(&req->rq_timed_list))
1232 list_add(&req->rq_timed_list,
1233 &array->paa_reqs_array[index]);
1235 spin_lock(&req->rq_lock);
1236 req->rq_at_linked = 1;
1237 spin_unlock(&req->rq_lock);
1238 req->rq_at_index = index;
1239 array->paa_reqs_count[index]++;
1241 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1242 array->paa_deadline = req->rq_deadline;
1243 ptlrpc_at_set_timer(svcpt);
1245 spin_unlock(&svcpt->scp_at_lock);
1251 ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1253 struct ptlrpc_at_array *array;
1255 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1257 /* NB: must call with hold svcpt::scp_at_lock */
1258 LASSERT(!list_empty(&req->rq_timed_list));
1259 list_del_init(&req->rq_timed_list);
1261 spin_lock(&req->rq_lock);
1262 req->rq_at_linked = 0;
1263 spin_unlock(&req->rq_lock);
1265 array->paa_reqs_count[req->rq_at_index]--;
1270 * Attempt to extend the request deadline by sending an early reply to the
1273 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1275 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1276 struct ptlrpc_request *reqcopy;
1277 struct lustre_msg *reqmsg;
1278 time64_t olddl = req->rq_deadline - ktime_get_real_seconds();
1284 if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_RECONNECT)) {
1285 /* don't send early reply */
1289 /* deadline is when the client expects us to reply, margin is the
1290 difference between clients' and servers' expectations */
1291 DEBUG_REQ(D_ADAPTTO, req,
1292 "%ssending early reply (deadline %+llds, margin %+llds) for "
1293 "%d+%d", AT_OFF ? "AT off - not " : "",
1294 (s64)olddl, (s64)(olddl - at_get(&svcpt->scp_at_estimate)),
1295 at_get(&svcpt->scp_at_estimate), at_extra);
1301 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+llds), "
1302 "not sending early reply. Consider increasing "
1303 "at_early_margin (%d)?", (s64)olddl, at_early_margin);
1305 /* Return an error so we're not re-added to the timed list. */
1309 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
1310 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
1311 "but no AT support");
1315 if (req->rq_export &&
1316 lustre_msg_get_flags(req->rq_reqmsg) &
1317 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1318 struct obd_device *obd_exp = req->rq_export->exp_obd;
1320 /* During recovery, we don't want to send too many early
1321 * replies, but on the other hand we want to make sure the
1322 * client has enough time to resend if the rpc is lost. So
1323 * during the recovery period send at least 4 early replies,
1324 * spacing them every at_extra if we can. at_estimate should
1325 * always equal this fixed value during recovery.
1327 /* Don't account request processing time into AT history
1328 * during recovery, it is not service time we need but
1329 * includes also waiting time for recovering clients
1331 newdl = min_t(time64_t, at_extra,
1332 obd_exp->obd_recovery_timeout / 4) +
1333 ktime_get_real_seconds();
1335 /* We want to extend the request deadline by at_extra seconds,
1336 * so we set our service estimate to reflect how much time has
1337 * passed since this request arrived plus an additional
1338 * at_extra seconds. The client will calculate the new deadline
1339 * based on this service estimate (plus some additional time to
1340 * account for network latency). See ptlrpc_at_recv_early_reply
1342 at_measured(&svcpt->scp_at_estimate, at_extra +
1343 ktime_get_real_seconds() -
1344 req->rq_arrival_time.tv_sec);
1345 newdl = req->rq_arrival_time.tv_sec +
1346 at_get(&svcpt->scp_at_estimate);
1349 /* Check to see if we've actually increased the deadline -
1350 * we may be past adaptive_max */
1351 if (req->rq_deadline >= newdl) {
1352 DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%lld/%lld), not sending early reply\n",
1353 (s64)olddl, (s64)(newdl - ktime_get_real_seconds()));
1357 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1358 if (reqcopy == NULL)
1360 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1362 GOTO(out_free, rc = -ENOMEM);
1365 reqcopy->rq_reply_state = NULL;
1366 reqcopy->rq_rep_swab_mask = 0;
1367 reqcopy->rq_pack_bulk = 0;
1368 reqcopy->rq_pack_udesc = 0;
1369 reqcopy->rq_packed_final = 0;
1370 sptlrpc_svc_ctx_addref(reqcopy);
1371 /* We only need the reqmsg for the magic */
1372 reqcopy->rq_reqmsg = reqmsg;
1373 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1376 * tgt_brw_read() and tgt_brw_write() may have decided not to reply.
1377 * Without this check, we would fail the rq_no_reply assertion in
1378 * ptlrpc_send_reply().
1380 if (reqcopy->rq_no_reply)
1381 GOTO(out, rc = -ETIMEDOUT);
1383 LASSERT(atomic_read(&req->rq_refcount));
1384 /** if it is last refcount then early reply isn't needed */
1385 if (atomic_read(&req->rq_refcount) == 1) {
1386 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1387 "abort sending early reply\n");
1388 GOTO(out, rc = -EINVAL);
1391 /* Connection ref */
1392 reqcopy->rq_export = class_conn2export(
1393 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1394 if (reqcopy->rq_export == NULL)
1395 GOTO(out, rc = -ENODEV);
1398 class_export_rpc_inc(reqcopy->rq_export);
1399 if (reqcopy->rq_export->exp_obd &&
1400 reqcopy->rq_export->exp_obd->obd_fail)
1401 GOTO(out_put, rc = -ENODEV);
1403 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1407 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1410 /* Adjust our own deadline to what we told the client */
1411 req->rq_deadline = newdl;
1412 req->rq_early_count++; /* number sent, server side */
1414 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1417 /* Free the (early) reply state from lustre_pack_reply.
1418 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1419 ptlrpc_req_drop_rs(reqcopy);
1422 class_export_rpc_dec(reqcopy->rq_export);
1423 class_export_put(reqcopy->rq_export);
1425 sptlrpc_svc_ctx_decref(reqcopy);
1426 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1428 ptlrpc_request_cache_free(reqcopy);
1432 /* Send early replies to everybody expiring within at_early_margin
1433 asking for at_extra time */
1434 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1436 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1437 struct ptlrpc_request *rq, *n;
1438 struct list_head work_list;
1441 time64_t now = ktime_get_real_seconds();
1442 cfs_duration_t delay;
1443 int first, counter = 0;
1446 spin_lock(&svcpt->scp_at_lock);
1447 if (svcpt->scp_at_check == 0) {
1448 spin_unlock(&svcpt->scp_at_lock);
1451 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1452 svcpt->scp_at_check = 0;
1454 if (array->paa_count == 0) {
1455 spin_unlock(&svcpt->scp_at_lock);
1459 /* The timer went off, but maybe the nearest rpc already completed. */
1460 first = array->paa_deadline - now;
1461 if (first > at_early_margin) {
1462 /* We've still got plenty of time. Reset the timer. */
1463 ptlrpc_at_set_timer(svcpt);
1464 spin_unlock(&svcpt->scp_at_lock);
1468 /* We're close to a timeout, and we don't know how much longer the
1469 server will take. Send early replies to everyone expiring soon. */
1470 INIT_LIST_HEAD(&work_list);
1472 div_u64_rem(array->paa_deadline, array->paa_size, &index);
1473 count = array->paa_count;
1475 count -= array->paa_reqs_count[index];
1476 list_for_each_entry_safe(rq, n,
1477 &array->paa_reqs_array[index],
1479 if (rq->rq_deadline > now + at_early_margin) {
1480 /* update the earliest deadline */
1481 if (deadline == -1 ||
1482 rq->rq_deadline < deadline)
1483 deadline = rq->rq_deadline;
1487 ptlrpc_at_remove_timed(rq);
1489 * ptlrpc_server_drop_request() may drop
1490 * refcount to 0 already. Let's check this and
1491 * don't add entry to work_list
1493 if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
1494 list_add(&rq->rq_timed_list, &work_list);
1498 if (++index >= array->paa_size)
1501 array->paa_deadline = deadline;
1502 /* we have a new earliest deadline, restart the timer */
1503 ptlrpc_at_set_timer(svcpt);
1505 spin_unlock(&svcpt->scp_at_lock);
1507 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1508 "replies\n", first, at_extra, counter);
1510 /* We're already past request deadlines before we even get a
1511 chance to send early replies */
1512 LCONSOLE_WARN("%s: This server is not able to keep up with "
1513 "request traffic (cpu-bound).\n",
1514 svcpt->scp_service->srv_name);
1515 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%ld(jiff)\n",
1516 counter, svcpt->scp_nreqs_incoming,
1517 svcpt->scp_nreqs_active,
1518 at_get(&svcpt->scp_at_estimate), delay);
1521 /* we took additional refcount so entries can't be deleted from list, no
1522 * locking is needed */
1523 while (!list_empty(&work_list)) {
1524 rq = list_entry(work_list.next, struct ptlrpc_request,
1526 list_del_init(&rq->rq_timed_list);
1528 if (ptlrpc_at_send_early_reply(rq) == 0)
1529 ptlrpc_at_add_timed(rq);
1531 ptlrpc_server_drop_request(rq);
1534 RETURN(1); /* return "did_something" for liblustre */
1537 /* Check if we are already handling earlier incarnation of this request.
1538 * Called under &req->rq_export->exp_rpc_lock locked */
1539 static int ptlrpc_server_check_resend_in_progress(struct ptlrpc_request *req)
1541 struct ptlrpc_request *tmp = NULL;
1543 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ||
1544 (atomic_read(&req->rq_export->exp_rpc_count) == 0))
1547 /* bulk request are aborted upon reconnect, don't try to
1549 if (req->rq_bulk_write || req->rq_bulk_read)
1552 /* This list should not be longer than max_requests in
1553 * flights on the client, so it is not all that long.
1554 * Also we only hit this codepath in case of a resent
1555 * request which makes it even more rarely hit */
1556 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs,
1558 /* Found duplicate one */
1559 if (tmp->rq_xid == req->rq_xid)
1562 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs,
1564 /* Found duplicate one */
1565 if (tmp->rq_xid == req->rq_xid)
1571 DEBUG_REQ(D_HA, req, "Found duplicate req in processing");
1572 DEBUG_REQ(D_HA, tmp, "Request being processed");
1577 * Check if a request should be assigned with a high priority.
1579 * \retval < 0: error occurred
1580 * 0: normal RPC request
1581 * +1: high priority request
1583 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1584 struct ptlrpc_request *req)
1589 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL) {
1590 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1597 if (req->rq_export != NULL && req->rq_ops != NULL) {
1598 /* Perform request specific check. We should do this
1599 * check before the request is added into exp_hp_rpcs
1600 * list otherwise it may hit swab race at LU-1044. */
1601 if (req->rq_ops->hpreq_check != NULL) {
1602 rc = req->rq_ops->hpreq_check(req);
1603 if (rc == -ESTALE) {
1604 req->rq_status = rc;
1607 /** can only return error,
1608 * 0 for normal request,
1609 * or 1 for high priority request */
1617 /** Remove the request from the export list. */
1618 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1621 if (req->rq_export) {
1622 /* refresh lock timeout again so that client has more
1623 * room to send lock cancel RPC. */
1624 if (req->rq_ops && req->rq_ops->hpreq_fini)
1625 req->rq_ops->hpreq_fini(req);
1627 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1628 list_del_init(&req->rq_exp_list);
1629 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1634 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1639 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1640 .hpreq_check = ptlrpc_hpreq_check,
1643 /* Hi-Priority RPC check by RPC operation code. */
1644 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1646 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1648 /* Check for export to let only reconnects for not yet evicted
1649 * export to become a HP rpc. */
1650 if ((req->rq_export != NULL) &&
1651 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1652 req->rq_ops = &ptlrpc_hpreq_common;
1656 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1658 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1659 struct ptlrpc_request *req)
1665 rc = ptlrpc_server_hpreq_init(svcpt, req);
1670 ptlrpc_nrs_req_initialize(svcpt, req, hp);
1672 if (req->rq_export != NULL) {
1673 struct obd_export *exp = req->rq_export;
1675 /* do search for duplicated xid and the adding to the list
1677 spin_lock_bh(&exp->exp_rpc_lock);
1678 rc = ptlrpc_server_check_resend_in_progress(req);
1680 spin_unlock_bh(&exp->exp_rpc_lock);
1682 ptlrpc_nrs_req_finalize(req);
1686 if (hp || req->rq_ops != NULL)
1687 list_add(&req->rq_exp_list, &exp->exp_hp_rpcs);
1689 list_add(&req->rq_exp_list, &exp->exp_reg_rpcs);
1690 spin_unlock_bh(&exp->exp_rpc_lock);
1693 /* the current thread is not the processing thread for this request
1694 * since that, but request is in exp_hp_list and can be find there.
1695 * Remove all relations between request and old thread. */
1696 req->rq_svc_thread->t_env->le_ses = NULL;
1697 req->rq_svc_thread = NULL;
1698 req->rq_session.lc_thread = NULL;
1700 ptlrpc_nrs_req_add(svcpt, req, hp);
1706 * Allow to handle high priority request
1707 * User can call it w/o any lock but need to hold
1708 * ptlrpc_service_part::scp_req_lock to get reliable result
1710 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1713 int running = svcpt->scp_nthrs_running;
1715 if (!nrs_svcpt_has_hp(svcpt))
1721 if (ptlrpc_nrs_req_throttling_nolock(svcpt, true))
1724 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1725 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1726 /* leave just 1 thread for normal RPCs */
1727 running = PTLRPC_NTHRS_INIT;
1728 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1732 if (svcpt->scp_nreqs_active >= running - 1)
1735 if (svcpt->scp_nhreqs_active == 0)
1738 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1739 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1742 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1745 return ptlrpc_server_allow_high(svcpt, force) &&
1746 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1750 * Only allow normal priority requests on a service that has a high-priority
1751 * queue if forced (i.e. cleanup), if there are other high priority requests
1752 * already being processed (i.e. those threads can service more high-priority
1753 * requests), or if there are enough idle threads that a later thread can do
1754 * a high priority request.
1755 * User can call it w/o any lock but need to hold
1756 * ptlrpc_service_part::scp_req_lock to get reliable result
1758 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1761 int running = svcpt->scp_nthrs_running;
1762 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1763 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1764 /* leave just 1 thread for normal RPCs */
1765 running = PTLRPC_NTHRS_INIT;
1766 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1773 if (ptlrpc_nrs_req_throttling_nolock(svcpt, false))
1776 if (svcpt->scp_nreqs_active < running - 2)
1779 if (svcpt->scp_nreqs_active >= running - 1)
1782 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1785 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1788 return ptlrpc_server_allow_normal(svcpt, force) &&
1789 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1793 * Returns true if there are requests available in incoming
1794 * request queue for processing and it is allowed to fetch them.
1795 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1796 * to get reliable result
1797 * \see ptlrpc_server_allow_normal
1798 * \see ptlrpc_server_allow high
1801 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1803 return ptlrpc_server_high_pending(svcpt, force) ||
1804 ptlrpc_server_normal_pending(svcpt, force);
1808 * Fetch a request for processing from queue of unprocessed requests.
1809 * Favors high-priority requests.
1810 * Returns a pointer to fetched request.
1812 static struct ptlrpc_request *
1813 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1815 struct ptlrpc_request *req = NULL;
1818 spin_lock(&svcpt->scp_req_lock);
1820 if (ptlrpc_server_high_pending(svcpt, force)) {
1821 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1823 svcpt->scp_hreq_count++;
1828 if (ptlrpc_server_normal_pending(svcpt, force)) {
1829 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1831 svcpt->scp_hreq_count = 0;
1836 spin_unlock(&svcpt->scp_req_lock);
1840 svcpt->scp_nreqs_active++;
1842 svcpt->scp_nhreqs_active++;
1844 spin_unlock(&svcpt->scp_req_lock);
1846 if (likely(req->rq_export))
1847 class_export_rpc_inc(req->rq_export);
1853 * Handle freshly incoming reqs, add to timed early reply list,
1854 * pass on to regular request queue.
1855 * All incoming requests pass through here before getting into
1856 * ptlrpc_server_handle_req later on.
1859 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1860 struct ptlrpc_thread *thread)
1862 struct ptlrpc_service *svc = svcpt->scp_service;
1863 struct ptlrpc_request *req;
1868 spin_lock(&svcpt->scp_lock);
1869 if (list_empty(&svcpt->scp_req_incoming)) {
1870 spin_unlock(&svcpt->scp_lock);
1874 req = list_entry(svcpt->scp_req_incoming.next,
1875 struct ptlrpc_request, rq_list);
1876 list_del_init(&req->rq_list);
1877 svcpt->scp_nreqs_incoming--;
1878 /* Consider this still a "queued" request as far as stats are
1880 spin_unlock(&svcpt->scp_lock);
1882 /* go through security check/transform */
1883 rc = sptlrpc_svc_unwrap_request(req);
1887 case SECSVC_COMPLETE:
1888 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1897 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1898 * redo it wouldn't be harmful.
1900 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1901 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1903 CERROR("error unpacking request: ptl %d from %s "
1904 "x%llu\n", svc->srv_req_portal,
1905 libcfs_id2str(req->rq_peer), req->rq_xid);
1910 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1912 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1913 "%llu\n", svc->srv_req_portal,
1914 libcfs_id2str(req->rq_peer), req->rq_xid);
1918 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1919 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1920 CERROR("drop incoming rpc opc %u, x%llu\n",
1921 cfs_fail_val, req->rq_xid);
1926 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1927 CERROR("wrong packet type received (type=%u) from %s\n",
1928 lustre_msg_get_type(req->rq_reqmsg),
1929 libcfs_id2str(req->rq_peer));
1933 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1937 req->rq_bulk_write = 1;
1941 case MGS_CONFIG_READ:
1942 req->rq_bulk_read = 1;
1946 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
1948 req->rq_export = class_conn2export(
1949 lustre_msg_get_handle(req->rq_reqmsg));
1950 if (req->rq_export) {
1951 rc = ptlrpc_check_req(req);
1953 rc = sptlrpc_target_export_check(req->rq_export, req);
1955 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1956 "illegal security flavor,");
1961 ptlrpc_update_export_timer(req->rq_export, 0);
1964 /* req_in handling should/must be fast */
1965 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
1966 DEBUG_REQ(D_WARNING, req, "Slow req_in handling %llds",
1967 (s64)(ktime_get_real_seconds() -
1968 req->rq_arrival_time.tv_sec));
1970 /* Set rpc server deadline and add it to the timed list */
1971 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1972 MSGHDR_AT_SUPPORT) ?
1973 /* The max time the client expects us to take */
1974 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1976 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1977 if (unlikely(deadline == 0)) {
1978 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1982 /* Skip early reply */
1983 if (OBD_FAIL_PRECHECK(OBD_FAIL_MDS_RESEND))
1984 req->rq_deadline += obd_timeout;
1986 req->rq_svc_thread = thread;
1987 if (thread != NULL) {
1988 /* initialize request session, it is needed for request
1989 * processing by target */
1990 rc = lu_context_init(&req->rq_session, LCT_SERVER_SESSION |
1993 CERROR("%s: failure to initialize session: rc = %d\n",
1994 thread->t_name, rc);
1997 req->rq_session.lc_thread = thread;
1998 lu_context_enter(&req->rq_session);
1999 thread->t_env->le_ses = &req->rq_session;
2002 ptlrpc_at_add_timed(req);
2004 /* Move it over to the request processing queue */
2005 rc = ptlrpc_server_request_add(svcpt, req);
2009 wake_up(&svcpt->scp_waitq);
2013 ptlrpc_server_finish_request(svcpt, req);
2019 * Main incoming request handling logic.
2020 * Calls handler function from service to do actual processing.
2023 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
2024 struct ptlrpc_thread *thread)
2026 struct ptlrpc_service *svc = svcpt->scp_service;
2027 struct ptlrpc_request *request;
2037 request = ptlrpc_server_request_get(svcpt, false);
2038 if (request == NULL)
2041 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
2042 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
2043 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
2044 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
2046 if (unlikely(fail_opc)) {
2047 if (request->rq_export && request->rq_ops)
2048 OBD_FAIL_TIMEOUT(fail_opc, 4);
2051 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
2053 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
2054 libcfs_debug_dumplog();
2056 work_start = ktime_get_real();
2057 arrived = timespec64_to_ktime(request->rq_arrival_time);
2058 timediff_usecs = ktime_us_delta(arrived, work_start);
2059 if (likely(svc->srv_stats != NULL)) {
2060 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
2062 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
2063 svcpt->scp_nreqs_incoming);
2064 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
2065 svcpt->scp_nreqs_active);
2066 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
2067 at_get(&svcpt->scp_at_estimate));
2070 if (likely(request->rq_export)) {
2071 if (unlikely(ptlrpc_check_req(request)))
2073 ptlrpc_update_export_timer(request->rq_export,
2074 timediff_usecs >> 19);
2077 /* Discard requests queued for longer than the deadline.
2078 The deadline is increased if we send an early reply. */
2079 if (ktime_get_real_seconds() > request->rq_deadline) {
2080 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline %lld:%llds ago\n",
2081 libcfs_id2str(request->rq_peer),
2082 request->rq_deadline -
2083 request->rq_arrival_time.tv_sec,
2084 ktime_get_real_seconds() - request->rq_deadline);
2088 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
2089 "%s:%s+%d:%d:x%llu:%s:%d\n", current_comm(),
2090 (request->rq_export ?
2091 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2092 (request->rq_export ?
2093 atomic_read(&request->rq_export->exp_refcount) : -99),
2094 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
2095 libcfs_id2str(request->rq_peer),
2096 lustre_msg_get_opc(request->rq_reqmsg));
2098 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
2099 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
2101 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
2103 /* re-assign request and sesson thread to the current one */
2104 request->rq_svc_thread = thread;
2105 if (thread != NULL) {
2106 LASSERT(request->rq_session.lc_thread == NULL);
2107 request->rq_session.lc_thread = thread;
2108 thread->t_env->le_ses = &request->rq_session;
2110 svc->srv_ops.so_req_handler(request);
2112 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
2115 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
2116 DEBUG_REQ(D_WARNING, request, "Request took longer than estimated (%lld:%llds); client may timeout.",
2117 request->rq_deadline -
2118 request->rq_arrival_time.tv_sec,
2119 ktime_get_real_seconds() - request->rq_deadline);
2122 work_end = ktime_get_real();
2123 timediff_usecs = ktime_us_delta(work_end, work_start);
2124 arrived_usecs = ktime_us_delta(work_end, arrived);
2125 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d Request procesed in %lldus (%lldus total) trans %llu rc %d/%d\n",
2127 (request->rq_export ?
2128 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2129 (request->rq_export ?
2130 atomic_read(&request->rq_export->exp_refcount) : -99),
2131 lustre_msg_get_status(request->rq_reqmsg),
2133 libcfs_id2str(request->rq_peer),
2134 lustre_msg_get_opc(request->rq_reqmsg),
2137 (request->rq_repmsg ?
2138 lustre_msg_get_transno(request->rq_repmsg) :
2139 request->rq_transno),
2141 (request->rq_repmsg ?
2142 lustre_msg_get_status(request->rq_repmsg) : -999));
2143 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2144 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2145 int opc = opcode_offset(op);
2146 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2147 LASSERT(opc < LUSTRE_MAX_OPCODES);
2148 lprocfs_counter_add(svc->srv_stats,
2149 opc + EXTRA_MAX_OPCODES,
2153 if (unlikely(request->rq_early_count)) {
2154 DEBUG_REQ(D_ADAPTTO, request,
2155 "sent %d early replies before finishing in %llds",
2156 request->rq_early_count,
2157 arrived_usecs / USEC_PER_SEC);
2160 ptlrpc_server_finish_active_request(svcpt, request);
2166 * An internal function to process a single reply state object.
2169 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2171 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2172 struct ptlrpc_service *svc = svcpt->scp_service;
2173 struct obd_export *exp;
2178 exp = rs->rs_export;
2180 LASSERT(rs->rs_difficult);
2181 LASSERT(rs->rs_scheduled);
2182 LASSERT(list_empty(&rs->rs_list));
2184 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2185 * iterates over newly committed replies, removing them from
2186 * exp_uncommitted_replies. It then drops this lock and schedules the
2187 * replies it found for handling here.
2189 * We can avoid contention for exp_uncommitted_replies_lock between the
2190 * HRT threads and further commit callbacks by checking rs_committed
2191 * which is set in the commit callback while it holds both
2192 * rs_lock and exp_uncommitted_reples.
2194 * If we see rs_committed clear, the commit callback _may_ not have
2195 * handled this reply yet and we race with it to grab
2196 * exp_uncommitted_replies_lock before removing the reply from
2197 * exp_uncommitted_replies. Note that if we lose the race and the
2198 * reply has already been removed, list_del_init() is a noop.
2200 * If we see rs_committed set, we know the commit callback is handling,
2201 * or has handled this reply since store reordering might allow us to
2202 * see rs_committed set out of sequence. But since this is done
2203 * holding rs_lock, we can be sure it has all completed once we hold
2204 * rs_lock, which we do right next.
2206 if (!rs->rs_committed) {
2207 /* if rs was commited, no need to convert locks, don't check
2208 * rs_committed here because rs may never be added into
2209 * exp_uncommitted_replies and this flag never be set, see
2210 * target_send_reply() */
2211 if (rs->rs_convert_lock &&
2212 rs->rs_transno > exp->exp_last_committed) {
2213 struct ldlm_lock *lock;
2214 struct ldlm_lock *ack_locks[RS_MAX_LOCKS] = { NULL };
2216 spin_lock(&rs->rs_lock);
2217 if (rs->rs_convert_lock &&
2218 rs->rs_transno > exp->exp_last_committed) {
2219 nlocks = rs->rs_nlocks;
2220 while (nlocks-- > 0) {
2222 * NB don't assume rs is always handled
2223 * by the same service thread (see
2224 * ptlrpc_hr_select, so REP-ACK hr may
2225 * race with trans commit, while the
2226 * latter will release locks, get locks
2227 * here early to convert to COS mode
2230 lock = ldlm_handle2lock(
2231 &rs->rs_locks[nlocks]);
2233 ack_locks[nlocks] = lock;
2234 rs->rs_modes[nlocks] = LCK_COS;
2236 nlocks = rs->rs_nlocks;
2237 rs->rs_convert_lock = 0;
2238 /* clear rs_scheduled so that commit callback
2239 * can schedule again */
2240 rs->rs_scheduled = 0;
2241 spin_unlock(&rs->rs_lock);
2243 while (nlocks-- > 0) {
2244 lock = ack_locks[nlocks];
2245 ldlm_lock_downgrade(lock, LCK_COS);
2246 LDLM_LOCK_PUT(lock);
2250 spin_unlock(&rs->rs_lock);
2253 spin_lock(&exp->exp_uncommitted_replies_lock);
2254 list_del_init(&rs->rs_obd_list);
2255 spin_unlock(&exp->exp_uncommitted_replies_lock);
2258 spin_lock(&exp->exp_lock);
2259 /* Noop if removed already */
2260 list_del_init(&rs->rs_exp_list);
2261 spin_unlock(&exp->exp_lock);
2263 spin_lock(&rs->rs_lock);
2265 been_handled = rs->rs_handled;
2268 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2269 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2271 if (nlocks == 0 && !been_handled) {
2272 /* If we see this, we should already have seen the warning
2273 * in mds_steal_ack_locks() */
2274 CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld"
2277 rs->rs_xid, rs->rs_transno, rs->rs_opc,
2278 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2281 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2282 spin_unlock(&rs->rs_lock);
2284 if (!been_handled && rs->rs_on_net) {
2285 LNetMDUnlink(rs->rs_md_h);
2286 /* Ignore return code; we're racing with completion */
2289 while (nlocks-- > 0)
2290 ldlm_lock_decref(&rs->rs_locks[nlocks],
2291 rs->rs_modes[nlocks]);
2293 spin_lock(&rs->rs_lock);
2296 rs->rs_scheduled = 0;
2297 rs->rs_convert_lock = 0;
2299 if (!rs->rs_on_net) {
2301 spin_unlock(&rs->rs_lock);
2303 class_export_put (exp);
2304 rs->rs_export = NULL;
2305 ptlrpc_rs_decref(rs);
2306 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2307 svc->srv_is_stopping)
2308 wake_up_all(&svcpt->scp_waitq);
2312 /* still on the net; callback will schedule */
2313 spin_unlock(&rs->rs_lock);
2319 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2321 int avail = svcpt->scp_nrqbds_posted;
2322 int low_water = test_req_buffer_pressure ? 0 :
2323 svcpt->scp_service->srv_nbuf_per_group / 2;
2325 /* NB I'm not locking; just looking. */
2327 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2328 * allowed the request history to grow out of control. We could put a
2329 * sanity check on that here and cull some history if we need the
2332 if (avail <= low_water)
2333 ptlrpc_grow_req_bufs(svcpt, 1);
2335 if (svcpt->scp_service->srv_stats) {
2336 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2337 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2342 ptlrpc_retry_rqbds(void *arg)
2344 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2346 svcpt->scp_rqbd_timeout = 0;
2351 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2353 return svcpt->scp_nreqs_active <
2354 svcpt->scp_nthrs_running - 1 -
2355 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2359 * allowed to create more threads
2360 * user can call it w/o any lock but need to hold
2361 * ptlrpc_service_part::scp_lock to get reliable result
2364 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2366 return svcpt->scp_nthrs_running +
2367 svcpt->scp_nthrs_starting <
2368 svcpt->scp_service->srv_nthrs_cpt_limit;
2372 * too many requests and allowed to create more threads
2375 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2377 return !ptlrpc_threads_enough(svcpt) &&
2378 ptlrpc_threads_increasable(svcpt);
2382 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2384 return thread_is_stopping(thread) ||
2385 thread->t_svcpt->scp_service->srv_is_stopping;
2389 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2391 return !list_empty(&svcpt->scp_rqbd_idle) &&
2392 svcpt->scp_rqbd_timeout == 0;
2396 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2398 return svcpt->scp_at_check;
2402 * requests wait on preprocessing
2403 * user can call it w/o any lock but need to hold
2404 * ptlrpc_service_part::scp_lock to get reliable result
2407 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2409 return !list_empty(&svcpt->scp_req_incoming);
2412 static __attribute__((__noinline__)) int
2413 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2414 struct ptlrpc_thread *thread)
2416 /* Don't exit while there are replies to be handled */
2417 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2418 ptlrpc_retry_rqbds, svcpt);
2420 lc_watchdog_disable(thread->t_watchdog);
2424 l_wait_event_exclusive_head(svcpt->scp_waitq,
2425 ptlrpc_thread_stopping(thread) ||
2426 ptlrpc_server_request_incoming(svcpt) ||
2427 ptlrpc_server_request_pending(svcpt, false) ||
2428 ptlrpc_rqbd_pending(svcpt) ||
2429 ptlrpc_at_check(svcpt), &lwi);
2431 if (ptlrpc_thread_stopping(thread))
2434 lc_watchdog_touch(thread->t_watchdog,
2435 ptlrpc_server_get_timeout(svcpt));
2440 * Main thread body for service threads.
2441 * Waits in a loop waiting for new requests to process to appear.
2442 * Every time an incoming requests is added to its queue, a waitq
2443 * is woken up and one of the threads will handle it.
2445 static int ptlrpc_main(void *arg)
2447 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2448 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2449 struct ptlrpc_service *svc = svcpt->scp_service;
2450 struct ptlrpc_reply_state *rs;
2451 struct group_info *ginfo = NULL;
2453 int counter = 0, rc = 0;
2456 thread->t_pid = current_pid();
2457 unshare_fs_struct();
2459 /* NB: we will call cfs_cpt_bind() for all threads, because we
2460 * might want to run lustre server only on a subset of system CPUs,
2461 * in that case ->scp_cpt is CFS_CPT_ANY */
2462 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2464 CWARN("%s: failed to bind %s on CPT %d\n",
2465 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2468 ginfo = groups_alloc(0);
2474 set_current_groups(ginfo);
2475 put_group_info(ginfo);
2477 if (svc->srv_ops.so_thr_init != NULL) {
2478 rc = svc->srv_ops.so_thr_init(thread);
2489 rc = lu_context_init(&env->le_ctx,
2490 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2494 thread->t_env = env;
2495 env->le_ctx.lc_thread = thread;
2496 env->le_ctx.lc_cookie = 0x6;
2498 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2499 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2503 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2504 svc->srv_name, svcpt->scp_cpt, rc);
2508 /* Alloc reply state structure for this one */
2509 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2515 spin_lock(&svcpt->scp_lock);
2517 LASSERT(thread_is_starting(thread));
2518 thread_clear_flags(thread, SVC_STARTING);
2520 LASSERT(svcpt->scp_nthrs_starting == 1);
2521 svcpt->scp_nthrs_starting--;
2523 /* SVC_STOPPING may already be set here if someone else is trying
2524 * to stop the service while this new thread has been dynamically
2525 * forked. We still set SVC_RUNNING to let our creator know that
2526 * we are now running, however we will exit as soon as possible */
2527 thread_add_flags(thread, SVC_RUNNING);
2528 svcpt->scp_nthrs_running++;
2529 spin_unlock(&svcpt->scp_lock);
2531 /* wake up our creator in case he's still waiting. */
2532 wake_up(&thread->t_ctl_waitq);
2534 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2537 spin_lock(&svcpt->scp_rep_lock);
2538 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2539 wake_up(&svcpt->scp_rep_waitq);
2540 spin_unlock(&svcpt->scp_rep_lock);
2542 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2543 svcpt->scp_nthrs_running);
2545 /* XXX maintain a list of all managed devices: insert here */
2546 while (!ptlrpc_thread_stopping(thread)) {
2547 if (ptlrpc_wait_event(svcpt, thread))
2550 ptlrpc_check_rqbd_pool(svcpt);
2552 if (ptlrpc_threads_need_create(svcpt)) {
2553 /* Ignore return code - we tried... */
2554 ptlrpc_start_thread(svcpt, 0);
2557 /* reset le_ses to initial state */
2559 /* Process all incoming reqs before handling any */
2560 if (ptlrpc_server_request_incoming(svcpt)) {
2561 lu_context_enter(&env->le_ctx);
2562 ptlrpc_server_handle_req_in(svcpt, thread);
2563 lu_context_exit(&env->le_ctx);
2565 /* but limit ourselves in case of flood */
2566 if (counter++ < 100)
2571 if (ptlrpc_at_check(svcpt))
2572 ptlrpc_at_check_timed(svcpt);
2574 if (ptlrpc_server_request_pending(svcpt, false)) {
2575 lu_context_enter(&env->le_ctx);
2576 ptlrpc_server_handle_request(svcpt, thread);
2577 lu_context_exit(&env->le_ctx);
2580 if (ptlrpc_rqbd_pending(svcpt) &&
2581 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2582 /* I just failed to repost request buffers.
2583 * Wait for a timeout (unless something else
2584 * happens) before I try again */
2585 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2586 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2587 svcpt->scp_nrqbds_posted);
2591 lc_watchdog_delete(thread->t_watchdog);
2592 thread->t_watchdog = NULL;
2596 * deconstruct service specific state created by ptlrpc_start_thread()
2598 if (svc->srv_ops.so_thr_done != NULL)
2599 svc->srv_ops.so_thr_done(thread);
2602 lu_context_fini(&env->le_ctx);
2606 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2607 thread, thread->t_pid, thread->t_id, rc);
2609 spin_lock(&svcpt->scp_lock);
2610 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2611 svcpt->scp_nthrs_starting--;
2613 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2614 /* must know immediately */
2615 svcpt->scp_nthrs_running--;
2619 thread_add_flags(thread, SVC_STOPPED);
2621 wake_up(&thread->t_ctl_waitq);
2622 spin_unlock(&svcpt->scp_lock);
2627 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2628 struct list_head *replies)
2632 spin_lock(&hrt->hrt_lock);
2634 list_splice_init(&hrt->hrt_queue, replies);
2635 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2637 spin_unlock(&hrt->hrt_lock);
2642 * Main body of "handle reply" function.
2643 * It processes acked reply states
2645 static int ptlrpc_hr_main(void *arg)
2647 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2648 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2649 struct list_head replies;
2652 INIT_LIST_HEAD(&replies);
2653 unshare_fs_struct();
2655 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2657 char threadname[20];
2659 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2660 hrp->hrp_cpt, hrt->hrt_id);
2661 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2662 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2665 atomic_inc(&hrp->hrp_nstarted);
2666 wake_up(&ptlrpc_hr.hr_waitq);
2668 while (!ptlrpc_hr.hr_stopping) {
2669 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2671 while (!list_empty(&replies)) {
2672 struct ptlrpc_reply_state *rs;
2674 rs = list_entry(replies.prev,
2675 struct ptlrpc_reply_state,
2677 list_del_init(&rs->rs_list);
2678 ptlrpc_handle_rs(rs);
2682 atomic_inc(&hrp->hrp_nstopped);
2683 wake_up(&ptlrpc_hr.hr_waitq);
2688 static void ptlrpc_stop_hr_threads(void)
2690 struct ptlrpc_hr_partition *hrp;
2694 ptlrpc_hr.hr_stopping = 1;
2696 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2697 if (hrp->hrp_thrs == NULL)
2698 continue; /* uninitialized */
2699 for (j = 0; j < hrp->hrp_nthrs; j++)
2700 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2703 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2704 if (hrp->hrp_thrs == NULL)
2705 continue; /* uninitialized */
2706 wait_event(ptlrpc_hr.hr_waitq,
2707 atomic_read(&hrp->hrp_nstopped) ==
2708 atomic_read(&hrp->hrp_nstarted));
2712 static int ptlrpc_start_hr_threads(void)
2714 struct ptlrpc_hr_partition *hrp;
2719 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2722 for (j = 0; j < hrp->hrp_nthrs; j++) {
2723 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2724 struct task_struct *task;
2726 task = kthread_run(ptlrpc_hr_main,
2728 "ptlrpc_hr%02d_%03d",
2737 wait_event(ptlrpc_hr.hr_waitq,
2738 atomic_read(&hrp->hrp_nstarted) == j);
2741 CERROR("cannot start reply handler thread %d:%d: "
2742 "rc = %d\n", i, j, rc);
2743 ptlrpc_stop_hr_threads();
2751 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2753 struct l_wait_info lwi = { 0 };
2754 struct ptlrpc_thread *thread;
2755 struct list_head zombie;
2759 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2760 svcpt->scp_service->srv_name);
2762 INIT_LIST_HEAD(&zombie);
2763 spin_lock(&svcpt->scp_lock);
2764 /* let the thread know that we would like it to stop asap */
2765 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2766 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2767 svcpt->scp_service->srv_thread_name, thread->t_id);
2768 thread_add_flags(thread, SVC_STOPPING);
2771 wake_up_all(&svcpt->scp_waitq);
2773 while (!list_empty(&svcpt->scp_threads)) {
2774 thread = list_entry(svcpt->scp_threads.next,
2775 struct ptlrpc_thread, t_link);
2776 if (thread_is_stopped(thread)) {
2777 list_del(&thread->t_link);
2778 list_add(&thread->t_link, &zombie);
2781 spin_unlock(&svcpt->scp_lock);
2783 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2784 svcpt->scp_service->srv_thread_name, thread->t_id);
2785 l_wait_event(thread->t_ctl_waitq,
2786 thread_is_stopped(thread), &lwi);
2788 spin_lock(&svcpt->scp_lock);
2791 spin_unlock(&svcpt->scp_lock);
2793 while (!list_empty(&zombie)) {
2794 thread = list_entry(zombie.next,
2795 struct ptlrpc_thread, t_link);
2796 list_del(&thread->t_link);
2797 OBD_FREE_PTR(thread);
2803 * Stops all threads of a particular service \a svc
2805 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2807 struct ptlrpc_service_part *svcpt;
2811 ptlrpc_service_for_each_part(svcpt, i, svc) {
2812 if (svcpt->scp_service != NULL)
2813 ptlrpc_svcpt_stop_threads(svcpt);
2819 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2826 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2827 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2829 for (i = 0; i < svc->srv_ncpts; i++) {
2830 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2831 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2837 /* We have enough threads, don't start more. b=15759 */
2844 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2845 svc->srv_thread_name, i, j, rc);
2846 ptlrpc_stop_all_threads(svc);
2850 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2852 struct l_wait_info lwi = { 0 };
2853 struct ptlrpc_thread *thread;
2854 struct ptlrpc_service *svc;
2855 struct task_struct *task;
2859 LASSERT(svcpt != NULL);
2861 svc = svcpt->scp_service;
2863 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2864 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2865 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2868 if (unlikely(svc->srv_is_stopping))
2871 if (!ptlrpc_threads_increasable(svcpt) ||
2872 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2873 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2876 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
2879 init_waitqueue_head(&thread->t_ctl_waitq);
2881 spin_lock(&svcpt->scp_lock);
2882 if (!ptlrpc_threads_increasable(svcpt)) {
2883 spin_unlock(&svcpt->scp_lock);
2884 OBD_FREE_PTR(thread);
2888 if (svcpt->scp_nthrs_starting != 0) {
2889 /* serialize starting because some modules (obdfilter)
2890 * might require unique and contiguous t_id */
2891 LASSERT(svcpt->scp_nthrs_starting == 1);
2892 spin_unlock(&svcpt->scp_lock);
2893 OBD_FREE_PTR(thread);
2895 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2896 svc->srv_thread_name, svcpt->scp_thr_nextid);
2901 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2902 svc->srv_thread_name, svcpt->scp_thr_nextid);
2906 svcpt->scp_nthrs_starting++;
2907 thread->t_id = svcpt->scp_thr_nextid++;
2908 thread_add_flags(thread, SVC_STARTING);
2909 thread->t_svcpt = svcpt;
2911 list_add(&thread->t_link, &svcpt->scp_threads);
2912 spin_unlock(&svcpt->scp_lock);
2914 if (svcpt->scp_cpt >= 0) {
2915 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s%02d_%03d",
2916 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2918 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s_%04d",
2919 svc->srv_thread_name, thread->t_id);
2922 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2923 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
2926 CERROR("cannot start thread '%s': rc = %d\n",
2927 thread->t_name, rc);
2928 spin_lock(&svcpt->scp_lock);
2929 --svcpt->scp_nthrs_starting;
2930 if (thread_is_stopping(thread)) {
2931 /* this ptlrpc_thread is being hanled
2932 * by ptlrpc_svcpt_stop_threads now
2934 thread_add_flags(thread, SVC_STOPPED);
2935 wake_up(&thread->t_ctl_waitq);
2936 spin_unlock(&svcpt->scp_lock);
2938 list_del(&thread->t_link);
2939 spin_unlock(&svcpt->scp_lock);
2940 OBD_FREE_PTR(thread);
2948 l_wait_event(thread->t_ctl_waitq,
2949 thread_is_running(thread) || thread_is_stopped(thread),
2952 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2956 int ptlrpc_hr_init(void)
2958 struct ptlrpc_hr_partition *hrp;
2959 struct ptlrpc_hr_thread *hrt;
2966 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2967 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2969 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2971 if (ptlrpc_hr.hr_partitions == NULL)
2974 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2976 weight = cpumask_weight(topology_sibling_cpumask(smp_processor_id()));
2978 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
2981 atomic_set(&hrp->hrp_nstarted, 0);
2982 atomic_set(&hrp->hrp_nstopped, 0);
2984 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, cpt);
2985 hrp->hrp_nthrs /= weight;
2986 if (hrp->hrp_nthrs == 0)
2989 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, cpt,
2990 hrp->hrp_nthrs * sizeof(*hrt));
2991 if (hrp->hrp_thrs == NULL)
2992 GOTO(out, rc = -ENOMEM);
2994 for (i = 0; i < hrp->hrp_nthrs; i++) {
2995 hrt = &hrp->hrp_thrs[i];
2998 hrt->hrt_partition = hrp;
2999 init_waitqueue_head(&hrt->hrt_waitq);
3000 spin_lock_init(&hrt->hrt_lock);
3001 INIT_LIST_HEAD(&hrt->hrt_queue);
3005 rc = ptlrpc_start_hr_threads();
3012 void ptlrpc_hr_fini(void)
3014 struct ptlrpc_hr_partition *hrp;
3017 if (ptlrpc_hr.hr_partitions == NULL)
3020 ptlrpc_stop_hr_threads();
3022 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3023 if (hrp->hrp_thrs != NULL) {
3024 OBD_FREE(hrp->hrp_thrs,
3025 hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
3029 cfs_percpt_free(ptlrpc_hr.hr_partitions);
3030 ptlrpc_hr.hr_partitions = NULL;
3035 * Wait until all already scheduled replies are processed.
3037 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
3041 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
3044 rc = l_wait_event(svcpt->scp_waitq,
3045 atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
3048 CWARN("Unexpectedly long timeout %s %p\n",
3049 svcpt->scp_service->srv_name, svcpt->scp_service);
3054 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
3056 struct ptlrpc_service_part *svcpt;
3059 /* early disarm AT timer... */
3060 ptlrpc_service_for_each_part(svcpt, i, svc) {
3061 if (svcpt->scp_service != NULL)
3062 del_timer(&svcpt->scp_at_timer);
3067 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
3069 struct ptlrpc_service_part *svcpt;
3070 struct ptlrpc_request_buffer_desc *rqbd;
3071 struct l_wait_info lwi;
3075 /* All history will be culled when the next request buffer is
3076 * freed in ptlrpc_service_purge_all() */
3077 svc->srv_hist_nrqbds_cpt_max = 0;
3079 rc = LNetClearLazyPortal(svc->srv_req_portal);
3082 ptlrpc_service_for_each_part(svcpt, i, svc) {
3083 if (svcpt->scp_service == NULL)
3086 /* Unlink all the request buffers. This forces a 'final'
3087 * event with its 'unlink' flag set for each posted rqbd */
3088 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
3090 rc = LNetMDUnlink(rqbd->rqbd_md_h);
3091 LASSERT(rc == 0 || rc == -ENOENT);
3095 ptlrpc_service_for_each_part(svcpt, i, svc) {
3096 if (svcpt->scp_service == NULL)
3099 /* Wait for the network to release any buffers
3100 * it's currently filling */
3101 spin_lock(&svcpt->scp_lock);
3102 while (svcpt->scp_nrqbds_posted != 0) {
3103 spin_unlock(&svcpt->scp_lock);
3104 /* Network access will complete in finite time but
3105 * the HUGE timeout lets us CWARN for visibility
3106 * of sluggish NALs */
3107 lwi = LWI_TIMEOUT_INTERVAL(
3108 cfs_time_seconds(LONG_UNLINK),
3109 cfs_time_seconds(1), NULL, NULL);
3110 rc = l_wait_event(svcpt->scp_waitq,
3111 svcpt->scp_nrqbds_posted == 0, &lwi);
3112 if (rc == -ETIMEDOUT) {
3113 CWARN("Service %s waiting for "
3114 "request buffers\n",
3115 svcpt->scp_service->srv_name);
3117 spin_lock(&svcpt->scp_lock);
3119 spin_unlock(&svcpt->scp_lock);
3124 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
3126 struct ptlrpc_service_part *svcpt;
3127 struct ptlrpc_request_buffer_desc *rqbd;
3128 struct ptlrpc_request *req;
3129 struct ptlrpc_reply_state *rs;
3132 ptlrpc_service_for_each_part(svcpt, i, svc) {
3133 if (svcpt->scp_service == NULL)
3136 spin_lock(&svcpt->scp_rep_lock);
3137 while (!list_empty(&svcpt->scp_rep_active)) {
3138 rs = list_entry(svcpt->scp_rep_active.next,
3139 struct ptlrpc_reply_state, rs_list);
3140 spin_lock(&rs->rs_lock);
3141 ptlrpc_schedule_difficult_reply(rs);
3142 spin_unlock(&rs->rs_lock);
3144 spin_unlock(&svcpt->scp_rep_lock);
3146 /* purge the request queue. NB No new replies (rqbds
3147 * all unlinked) and no service threads, so I'm the only
3148 * thread noodling the request queue now */
3149 while (!list_empty(&svcpt->scp_req_incoming)) {
3150 req = list_entry(svcpt->scp_req_incoming.next,
3151 struct ptlrpc_request, rq_list);
3153 list_del(&req->rq_list);
3154 svcpt->scp_nreqs_incoming--;
3155 ptlrpc_server_finish_request(svcpt, req);
3158 while (ptlrpc_server_request_pending(svcpt, true)) {
3159 req = ptlrpc_server_request_get(svcpt, true);
3160 ptlrpc_server_finish_active_request(svcpt, req);
3163 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
3164 LASSERT(svcpt->scp_nreqs_incoming == 0);
3165 LASSERT(svcpt->scp_nreqs_active == 0);
3166 /* history should have been culled by
3167 * ptlrpc_server_finish_request */
3168 LASSERT(svcpt->scp_hist_nrqbds == 0);
3170 /* Now free all the request buffers since nothing
3171 * references them any more... */
3173 while (!list_empty(&svcpt->scp_rqbd_idle)) {
3174 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
3175 struct ptlrpc_request_buffer_desc,
3177 ptlrpc_free_rqbd(rqbd);
3179 ptlrpc_wait_replies(svcpt);
3181 while (!list_empty(&svcpt->scp_rep_idle)) {
3182 rs = list_entry(svcpt->scp_rep_idle.next,
3183 struct ptlrpc_reply_state,
3185 list_del(&rs->rs_list);
3186 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
3192 ptlrpc_service_free(struct ptlrpc_service *svc)
3194 struct ptlrpc_service_part *svcpt;
3195 struct ptlrpc_at_array *array;
3198 ptlrpc_service_for_each_part(svcpt, i, svc) {
3199 if (svcpt->scp_service == NULL)
3202 /* In case somebody rearmed this in the meantime */
3203 del_timer(&svcpt->scp_at_timer);
3204 array = &svcpt->scp_at_array;
3206 if (array->paa_reqs_array != NULL) {
3207 OBD_FREE(array->paa_reqs_array,
3208 sizeof(struct list_head) * array->paa_size);
3209 array->paa_reqs_array = NULL;
3212 if (array->paa_reqs_count != NULL) {
3213 OBD_FREE(array->paa_reqs_count,
3214 sizeof(__u32) * array->paa_size);
3215 array->paa_reqs_count = NULL;
3219 ptlrpc_service_for_each_part(svcpt, i, svc)
3220 OBD_FREE_PTR(svcpt);
3222 if (svc->srv_cpts != NULL)
3223 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3225 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3226 srv_parts[svc->srv_ncpts]));
3229 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3233 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3235 service->srv_is_stopping = 1;
3237 mutex_lock(&ptlrpc_all_services_mutex);
3238 list_del_init(&service->srv_list);
3239 mutex_unlock(&ptlrpc_all_services_mutex);
3241 ptlrpc_service_del_atimer(service);
3242 ptlrpc_stop_all_threads(service);
3244 ptlrpc_service_unlink_rqbd(service);
3245 ptlrpc_service_purge_all(service);
3246 ptlrpc_service_nrs_cleanup(service);
3248 ptlrpc_lprocfs_unregister_service(service);
3249 ptlrpc_sysfs_unregister_service(service);
3251 ptlrpc_service_free(service);
3255 EXPORT_SYMBOL(ptlrpc_unregister_service);
3258 * Returns 0 if the service is healthy.
3260 * Right now, it just checks to make sure that requests aren't languishing
3261 * in the queue. We'll use this health check to govern whether a node needs
3262 * to be shot, so it's intentionally non-aggressive. */
3263 static int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3265 struct ptlrpc_request *request = NULL;
3266 struct timespec64 right_now;
3267 struct timespec64 timediff;
3269 ktime_get_real_ts64(&right_now);
3271 spin_lock(&svcpt->scp_req_lock);
3272 /* How long has the next entry been waiting? */
3273 if (ptlrpc_server_high_pending(svcpt, true))
3274 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3275 else if (ptlrpc_server_normal_pending(svcpt, true))
3276 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3278 if (request == NULL) {
3279 spin_unlock(&svcpt->scp_req_lock);
3283 timediff = timespec64_sub(right_now, request->rq_arrival_time);
3284 spin_unlock(&svcpt->scp_req_lock);
3286 if ((timediff.tv_sec) >
3287 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3288 CERROR("%s: unhealthy - request has been waiting %llds\n",
3289 svcpt->scp_service->srv_name, (s64)timediff.tv_sec);
3297 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3299 struct ptlrpc_service_part *svcpt;
3305 ptlrpc_service_for_each_part(svcpt, i, svc) {
3306 int rc = ptlrpc_svcpt_health_check(svcpt);
3313 EXPORT_SYMBOL(ptlrpc_service_health_check);