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 if (req->rq_export->exp_disconnected) {
189 ldlm_lock_decref(lock, mode);
191 idx = rs->rs_nlocks++;
192 rs->rs_locks[idx] = *lock;
193 rs->rs_modes[idx] = mode;
194 rs->rs_difficult = 1;
195 rs->rs_no_ack = no_ack;
196 rs->rs_convert_lock = convert_lock;
199 EXPORT_SYMBOL(ptlrpc_save_lock);
202 struct ptlrpc_hr_partition;
204 struct ptlrpc_hr_thread {
205 int hrt_id; /* thread ID */
207 wait_queue_head_t hrt_waitq;
208 struct list_head hrt_queue;
209 struct ptlrpc_hr_partition *hrt_partition;
212 struct ptlrpc_hr_partition {
213 /* # of started threads */
214 atomic_t hrp_nstarted;
215 /* # of stopped threads */
216 atomic_t hrp_nstopped;
217 /* cpu partition id */
219 /* round-robin rotor for choosing thread */
221 /* total number of threads on this partition */
224 struct ptlrpc_hr_thread *hrp_thrs;
227 #define HRT_RUNNING 0
228 #define HRT_STOPPING 1
230 struct ptlrpc_hr_service {
231 /* CPU partition table, it's just cfs_cpt_table for now */
232 struct cfs_cpt_table *hr_cpt_table;
233 /** controller sleep waitq */
234 wait_queue_head_t hr_waitq;
235 unsigned int hr_stopping;
236 /** roundrobin rotor for non-affinity service */
237 unsigned int hr_rotor;
239 struct ptlrpc_hr_partition **hr_partitions;
243 struct list_head rsb_replies;
244 unsigned int rsb_n_replies;
245 struct ptlrpc_service_part *rsb_svcpt;
248 /** reply handling service. */
249 static struct ptlrpc_hr_service ptlrpc_hr;
252 * maximum mumber of replies scheduled in one batch
254 #define MAX_SCHEDULED 256
257 * Initialize a reply batch.
261 static void rs_batch_init(struct rs_batch *b)
263 memset(b, 0, sizeof *b);
264 INIT_LIST_HEAD(&b->rsb_replies);
268 * Choose an hr thread to dispatch requests to.
270 static struct ptlrpc_hr_thread *
271 ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
273 struct ptlrpc_hr_partition *hrp;
276 if (svcpt->scp_cpt >= 0 &&
277 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
278 /* directly match partition */
279 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
282 rotor = ptlrpc_hr.hr_rotor++;
283 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
285 hrp = ptlrpc_hr.hr_partitions[rotor];
288 rotor = hrp->hrp_rotor++;
289 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
293 * Dispatch all replies accumulated in the batch to one from
294 * dedicated reply handling threads.
298 static void rs_batch_dispatch(struct rs_batch *b)
300 if (b->rsb_n_replies != 0) {
301 struct ptlrpc_hr_thread *hrt;
303 hrt = ptlrpc_hr_select(b->rsb_svcpt);
305 spin_lock(&hrt->hrt_lock);
306 list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
307 spin_unlock(&hrt->hrt_lock);
309 wake_up(&hrt->hrt_waitq);
310 b->rsb_n_replies = 0;
315 * Add a reply to a batch.
316 * Add one reply object to a batch, schedule batched replies if overload.
321 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
323 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
325 if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
326 if (b->rsb_svcpt != NULL) {
327 rs_batch_dispatch(b);
328 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
330 spin_lock(&svcpt->scp_rep_lock);
331 b->rsb_svcpt = svcpt;
333 spin_lock(&rs->rs_lock);
334 rs->rs_scheduled_ever = 1;
335 if (rs->rs_scheduled == 0) {
336 list_move(&rs->rs_list, &b->rsb_replies);
337 rs->rs_scheduled = 1;
340 rs->rs_committed = 1;
341 spin_unlock(&rs->rs_lock);
345 * Reply batch finalization.
346 * Dispatch remaining replies from the batch
347 * and release remaining spinlock.
351 static void rs_batch_fini(struct rs_batch *b)
353 if (b->rsb_svcpt != NULL) {
354 rs_batch_dispatch(b);
355 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
359 #define DECLARE_RS_BATCH(b) struct rs_batch b
363 * Put reply state into a queue for processing because we received
364 * ACK from the client
366 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
368 struct ptlrpc_hr_thread *hrt;
371 LASSERT(list_empty(&rs->rs_list));
373 hrt = ptlrpc_hr_select(rs->rs_svcpt);
375 spin_lock(&hrt->hrt_lock);
376 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
377 spin_unlock(&hrt->hrt_lock);
379 wake_up(&hrt->hrt_waitq);
384 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
388 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
389 assert_spin_locked(&rs->rs_lock);
390 LASSERT (rs->rs_difficult);
391 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
393 if (rs->rs_scheduled) { /* being set up or already notified */
398 rs->rs_scheduled = 1;
399 list_del_init(&rs->rs_list);
400 ptlrpc_dispatch_difficult_reply(rs);
403 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
405 void ptlrpc_commit_replies(struct obd_export *exp)
407 struct ptlrpc_reply_state *rs, *nxt;
408 DECLARE_RS_BATCH(batch);
411 rs_batch_init(&batch);
412 /* Find any replies that have been committed and get their service
413 * to attend to complete them. */
415 /* CAVEAT EMPTOR: spinlock ordering!!! */
416 spin_lock(&exp->exp_uncommitted_replies_lock);
417 list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
419 LASSERT (rs->rs_difficult);
420 /* VBR: per-export last_committed */
421 LASSERT(rs->rs_export);
422 if (rs->rs_transno <= exp->exp_last_committed) {
423 list_del_init(&rs->rs_obd_list);
424 rs_batch_add(&batch, rs);
427 spin_unlock(&exp->exp_uncommitted_replies_lock);
428 rs_batch_fini(&batch);
433 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
435 struct ptlrpc_request_buffer_desc *rqbd;
440 spin_lock(&svcpt->scp_lock);
442 if (list_empty(&svcpt->scp_rqbd_idle)) {
443 spin_unlock(&svcpt->scp_lock);
447 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
448 struct ptlrpc_request_buffer_desc,
450 list_del(&rqbd->rqbd_list);
452 /* assume we will post successfully */
453 svcpt->scp_nrqbds_posted++;
454 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
456 spin_unlock(&svcpt->scp_lock);
458 rc = ptlrpc_register_rqbd(rqbd);
465 spin_lock(&svcpt->scp_lock);
467 svcpt->scp_nrqbds_posted--;
468 list_del(&rqbd->rqbd_list);
469 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
471 /* Don't complain if no request buffers are posted right now; LNET
472 * won't drop requests because we set the portal lazy! */
474 spin_unlock(&svcpt->scp_lock);
479 static void ptlrpc_at_timer(unsigned long castmeharder)
481 struct ptlrpc_service_part *svcpt;
483 svcpt = (struct ptlrpc_service_part *)castmeharder;
485 svcpt->scp_at_check = 1;
486 svcpt->scp_at_checktime = cfs_time_current();
487 wake_up(&svcpt->scp_waitq);
491 ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
492 struct ptlrpc_service_conf *conf)
494 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
501 * Common code for estimating & validating threads number.
502 * CPT affinity service could have percpt thread-pool instead
503 * of a global thread-pool, which means user might not always
504 * get the threads number they give it in conf::tc_nthrs_user
505 * even they did set. It's because we need to validate threads
506 * number for each CPT to guarantee each pool will have enough
507 * threads to keep the service healthy.
509 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
510 init = max_t(int, init, tc->tc_nthrs_init);
512 /* NB: please see comments in lustre_lnet.h for definition
513 * details of these members */
514 LASSERT(tc->tc_nthrs_max != 0);
516 if (tc->tc_nthrs_user != 0) {
517 /* In case there is a reason to test a service with many
518 * threads, we give a less strict check here, it can
519 * be up to 8 * nthrs_max */
520 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
521 nthrs = total / svc->srv_ncpts;
522 init = max(init, nthrs);
526 total = tc->tc_nthrs_max;
527 if (tc->tc_nthrs_base == 0) {
528 /* don't care about base threads number per partition,
529 * this is most for non-affinity service */
530 nthrs = total / svc->srv_ncpts;
534 nthrs = tc->tc_nthrs_base;
535 if (svc->srv_ncpts == 1) {
538 /* NB: Increase the base number if it's single partition
539 * and total number of cores/HTs is larger or equal to 4.
540 * result will always < 2 * nthrs_base */
541 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
542 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
543 (tc->tc_nthrs_base >> i) != 0; i++)
544 nthrs += tc->tc_nthrs_base >> i;
547 if (tc->tc_thr_factor != 0) {
548 int factor = tc->tc_thr_factor;
552 * User wants to increase number of threads with for
553 * each CPU core/HT, most likely the factor is larger than
554 * one thread/core because service threads are supposed to
555 * be blocked by lock or wait for IO.
558 * Amdahl's law says that adding processors wouldn't give
559 * a linear increasing of parallelism, so it's nonsense to
560 * have too many threads no matter how many cores/HTs
563 if (cpumask_weight(topology_sibling_cpumask(smp_processor_id())) > 1) {
564 /* weight is # of HTs */
565 /* depress thread factor for hyper-thread */
566 factor = factor - (factor >> 1) + (factor >> 3);
569 weight = cfs_cpt_weight(svc->srv_cptable, 0);
571 for (; factor > 0 && weight > 0; factor--, weight -= fade)
572 nthrs += min(weight, fade) * factor;
575 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
576 nthrs = max(tc->tc_nthrs_base,
577 tc->tc_nthrs_max / svc->srv_ncpts);
580 nthrs = max(nthrs, tc->tc_nthrs_init);
581 svc->srv_nthrs_cpt_limit = nthrs;
582 svc->srv_nthrs_cpt_init = init;
584 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
585 CDEBUG(D_OTHER, "%s: This service may have more threads (%d) "
586 "than the given soft limit (%d)\n",
587 svc->srv_name, nthrs * svc->srv_ncpts,
593 * Initialize percpt data for a service
596 ptlrpc_service_part_init(struct ptlrpc_service *svc,
597 struct ptlrpc_service_part *svcpt, int cpt)
599 struct ptlrpc_at_array *array;
604 svcpt->scp_cpt = cpt;
605 INIT_LIST_HEAD(&svcpt->scp_threads);
607 /* rqbd and incoming request queue */
608 spin_lock_init(&svcpt->scp_lock);
609 INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
610 INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
611 INIT_LIST_HEAD(&svcpt->scp_req_incoming);
612 init_waitqueue_head(&svcpt->scp_waitq);
613 /* history request & rqbd list */
614 INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
615 INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
617 /* acitve requests and hp requests */
618 spin_lock_init(&svcpt->scp_req_lock);
621 spin_lock_init(&svcpt->scp_rep_lock);
622 INIT_LIST_HEAD(&svcpt->scp_rep_active);
623 INIT_LIST_HEAD(&svcpt->scp_rep_idle);
624 init_waitqueue_head(&svcpt->scp_rep_waitq);
625 atomic_set(&svcpt->scp_nreps_difficult, 0);
627 /* adaptive timeout */
628 spin_lock_init(&svcpt->scp_at_lock);
629 array = &svcpt->scp_at_array;
631 size = at_est2timeout(at_max);
632 array->paa_size = size;
633 array->paa_count = 0;
634 array->paa_deadline = -1;
636 /* allocate memory for scp_at_array (ptlrpc_at_array) */
637 OBD_CPT_ALLOC(array->paa_reqs_array,
638 svc->srv_cptable, cpt, sizeof(struct list_head) * size);
639 if (array->paa_reqs_array == NULL)
642 for (index = 0; index < size; index++)
643 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
645 OBD_CPT_ALLOC(array->paa_reqs_count,
646 svc->srv_cptable, cpt, sizeof(__u32) * size);
647 if (array->paa_reqs_count == NULL)
650 setup_timer(&svcpt->scp_at_timer, ptlrpc_at_timer,
651 (unsigned long)svcpt);
653 /* At SOW, service time should be quick; 10s seems generous. If client
654 * timeout is less than this, we'll be sending an early reply. */
655 at_init(&svcpt->scp_at_estimate, 10, 0);
657 /* assign this before call ptlrpc_grow_req_bufs */
658 svcpt->scp_service = svc;
659 /* Now allocate the request buffers, but don't post them now */
660 rc = ptlrpc_grow_req_bufs(svcpt, 0);
661 /* We shouldn't be under memory pressure at startup, so
662 * fail if we can't allocate all our buffers at this time. */
669 if (array->paa_reqs_count != NULL) {
670 OBD_FREE(array->paa_reqs_count, sizeof(__u32) * size);
671 array->paa_reqs_count = NULL;
674 if (array->paa_reqs_array != NULL) {
675 OBD_FREE(array->paa_reqs_array,
676 sizeof(struct list_head) * array->paa_size);
677 array->paa_reqs_array = NULL;
684 * Initialize service on a given portal.
685 * This includes starting serving threads , allocating and posting rqbds and
688 struct ptlrpc_service *
689 ptlrpc_register_service(struct ptlrpc_service_conf *conf,
690 struct proc_dir_entry *proc_entry)
692 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
693 struct ptlrpc_service *service;
694 struct ptlrpc_service_part *svcpt;
695 struct cfs_cpt_table *cptable;
703 LASSERT(conf->psc_buf.bc_nbufs > 0);
704 LASSERT(conf->psc_buf.bc_buf_size >=
705 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
706 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
708 cptable = cconf->cc_cptable;
710 cptable = cfs_cpt_table;
712 if (!conf->psc_thr.tc_cpu_affinity) {
715 ncpts = cfs_cpt_number(cptable);
716 if (cconf->cc_pattern != NULL) {
717 struct cfs_expr_list *el;
719 rc = cfs_expr_list_parse(cconf->cc_pattern,
720 strlen(cconf->cc_pattern),
723 CERROR("%s: invalid CPT pattern string: %s",
724 conf->psc_name, cconf->cc_pattern);
725 RETURN(ERR_PTR(-EINVAL));
728 rc = cfs_expr_list_values(el, ncpts, &cpts);
729 cfs_expr_list_free(el);
731 CERROR("%s: failed to parse CPT array %s: %d\n",
732 conf->psc_name, cconf->cc_pattern, rc);
734 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
735 RETURN(ERR_PTR(rc < 0 ? rc : -EINVAL));
741 OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
742 if (service == NULL) {
744 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
745 RETURN(ERR_PTR(-ENOMEM));
748 service->srv_cptable = cptable;
749 service->srv_cpts = cpts;
750 service->srv_ncpts = ncpts;
752 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
753 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
754 service->srv_cpt_bits++;
757 spin_lock_init(&service->srv_lock);
758 service->srv_name = conf->psc_name;
759 service->srv_watchdog_factor = conf->psc_watchdog_factor;
760 INIT_LIST_HEAD(&service->srv_list); /* for safty of cleanup */
762 /* buffer configuration */
763 service->srv_nbuf_per_group = test_req_buffer_pressure ?
764 1 : conf->psc_buf.bc_nbufs;
765 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
767 service->srv_buf_size = conf->psc_buf.bc_buf_size;
768 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
769 service->srv_req_portal = conf->psc_buf.bc_req_portal;
771 /* Increase max reply size to next power of two */
772 service->srv_max_reply_size = 1;
773 while (service->srv_max_reply_size <
774 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
775 service->srv_max_reply_size <<= 1;
777 service->srv_thread_name = conf->psc_thr.tc_thr_name;
778 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
779 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
780 service->srv_ops = conf->psc_ops;
782 for (i = 0; i < ncpts; i++) {
783 if (!conf->psc_thr.tc_cpu_affinity)
786 cpt = cpts != NULL ? cpts[i] : i;
788 OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
790 GOTO(failed, rc = -ENOMEM);
792 service->srv_parts[i] = svcpt;
793 rc = ptlrpc_service_part_init(service, svcpt, cpt);
798 ptlrpc_server_nthreads_check(service, conf);
800 rc = LNetSetLazyPortal(service->srv_req_portal);
803 mutex_lock(&ptlrpc_all_services_mutex);
804 list_add(&service->srv_list, &ptlrpc_all_services);
805 mutex_unlock(&ptlrpc_all_services_mutex);
807 if (proc_entry != NULL)
808 ptlrpc_lprocfs_register_service(proc_entry, service);
810 rc = ptlrpc_service_nrs_setup(service);
814 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
815 service->srv_name, service->srv_req_portal);
817 rc = ptlrpc_start_threads(service);
819 CERROR("Failed to start threads for service %s: %d\n",
820 service->srv_name, rc);
826 ptlrpc_unregister_service(service);
829 EXPORT_SYMBOL(ptlrpc_register_service);
832 * to actually free the request, must be called without holding svc_lock.
833 * note it's caller's responsibility to unlink req->rq_list.
835 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
837 LASSERT(atomic_read(&req->rq_refcount) == 0);
838 LASSERT(list_empty(&req->rq_timed_list));
840 /* DEBUG_REQ() assumes the reply state of a request with a valid
841 * ref will not be destroyed until that reference is dropped. */
842 ptlrpc_req_drop_rs(req);
844 sptlrpc_svc_ctx_decref(req);
846 if (req != &req->rq_rqbd->rqbd_req) {
847 /* NB request buffers use an embedded
848 * req if the incoming req unlinked the
849 * MD; this isn't one of them! */
850 ptlrpc_request_cache_free(req);
855 * drop a reference count of the request. if it reaches 0, we either
856 * put it into history list, or free it immediately.
858 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
860 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
861 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
862 struct ptlrpc_service *svc = svcpt->scp_service;
864 struct list_head *tmp;
865 struct list_head *nxt;
867 if (!atomic_dec_and_test(&req->rq_refcount))
870 if (req->rq_session.lc_state == LCS_ENTERED) {
871 lu_context_exit(&req->rq_session);
872 lu_context_fini(&req->rq_session);
875 if (req->rq_at_linked) {
876 spin_lock(&svcpt->scp_at_lock);
877 /* recheck with lock, in case it's unlinked by
878 * ptlrpc_at_check_timed() */
879 if (likely(req->rq_at_linked))
880 ptlrpc_at_remove_timed(req);
881 spin_unlock(&svcpt->scp_at_lock);
884 LASSERT(list_empty(&req->rq_timed_list));
886 /* finalize request */
887 if (req->rq_export) {
888 class_export_put(req->rq_export);
889 req->rq_export = NULL;
892 spin_lock(&svcpt->scp_lock);
894 list_add(&req->rq_list, &rqbd->rqbd_reqs);
896 refcount = --(rqbd->rqbd_refcount);
898 /* request buffer is now idle: add to history */
899 list_del(&rqbd->rqbd_list);
901 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
902 svcpt->scp_hist_nrqbds++;
904 /* cull some history?
905 * I expect only about 1 or 2 rqbds need to be recycled here */
906 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
907 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
908 struct ptlrpc_request_buffer_desc,
911 list_del(&rqbd->rqbd_list);
912 svcpt->scp_hist_nrqbds--;
914 /* remove rqbd's reqs from svc's req history while
915 * I've got the service lock */
916 list_for_each(tmp, &rqbd->rqbd_reqs) {
917 req = list_entry(tmp, struct ptlrpc_request,
919 /* Track the highest culled req seq */
920 if (req->rq_history_seq >
921 svcpt->scp_hist_seq_culled) {
922 svcpt->scp_hist_seq_culled =
925 list_del(&req->rq_history_list);
928 spin_unlock(&svcpt->scp_lock);
930 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
931 req = list_entry(rqbd->rqbd_reqs.next,
932 struct ptlrpc_request,
934 list_del(&req->rq_list);
935 ptlrpc_server_free_request(req);
938 spin_lock(&svcpt->scp_lock);
940 * now all reqs including the embedded req has been
941 * disposed, schedule request buffer for re-use
942 * or free it to drain some in excess.
944 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == 0);
945 if (svcpt->scp_nrqbds_posted >=
946 svc->srv_nbuf_per_group &&
947 !test_req_buffer_pressure) {
948 /* like in ptlrpc_free_rqbd() */
949 svcpt->scp_nrqbds_total--;
950 OBD_FREE_LARGE(rqbd->rqbd_buffer,
954 list_add_tail(&rqbd->rqbd_list,
955 &svcpt->scp_rqbd_idle);
959 spin_unlock(&svcpt->scp_lock);
960 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
961 /* If we are low on memory, we are not interested in history */
962 list_del(&req->rq_list);
963 list_del_init(&req->rq_history_list);
965 /* Track the highest culled req seq */
966 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
967 svcpt->scp_hist_seq_culled = req->rq_history_seq;
969 spin_unlock(&svcpt->scp_lock);
971 ptlrpc_server_free_request(req);
973 spin_unlock(&svcpt->scp_lock);
977 /** Change request export and move hp request from old export to new */
978 void ptlrpc_request_change_export(struct ptlrpc_request *req,
979 struct obd_export *export)
981 if (req->rq_export != NULL) {
982 LASSERT(!list_empty(&req->rq_exp_list));
983 /* remove rq_exp_list from last export */
984 spin_lock_bh(&req->rq_export->exp_rpc_lock);
985 list_del_init(&req->rq_exp_list);
986 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
987 /* export has one reference already, so it`s safe to
988 * add req to export queue here and get another
989 * reference for request later */
990 spin_lock_bh(&export->exp_rpc_lock);
991 if (req->rq_ops != NULL) /* hp request */
992 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
994 list_add(&req->rq_exp_list, &export->exp_reg_rpcs);
995 spin_unlock_bh(&export->exp_rpc_lock);
997 class_export_rpc_dec(req->rq_export);
998 class_export_put(req->rq_export);
1001 /* request takes one export refcount */
1002 req->rq_export = class_export_get(export);
1003 class_export_rpc_inc(export);
1009 * to finish a request: stop sending more early replies, and release
1012 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
1013 struct ptlrpc_request *req)
1015 ptlrpc_server_hpreq_fini(req);
1017 ptlrpc_server_drop_request(req);
1021 * to finish an active request: stop sending more early replies, and release
1022 * the request. should be called after we finished handling the request.
1024 static void ptlrpc_server_finish_active_request(
1025 struct ptlrpc_service_part *svcpt,
1026 struct ptlrpc_request *req)
1028 spin_lock(&svcpt->scp_req_lock);
1029 ptlrpc_nrs_req_stop_nolock(req);
1030 svcpt->scp_nreqs_active--;
1032 svcpt->scp_nhreqs_active--;
1033 spin_unlock(&svcpt->scp_req_lock);
1035 ptlrpc_nrs_req_finalize(req);
1037 if (req->rq_export != NULL)
1038 class_export_rpc_dec(req->rq_export);
1040 ptlrpc_server_finish_request(svcpt, req);
1044 * This function makes sure dead exports are evicted in a timely manner.
1045 * This function is only called when some export receives a message (i.e.,
1046 * the network is up.)
1048 void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
1050 struct obd_export *oldest_exp;
1051 time_t oldest_time, new_time;
1057 /* Compensate for slow machines, etc, by faking our request time
1058 into the future. Although this can break the strict time-ordering
1059 of the list, we can be really lazy here - we don't have to evict
1060 at the exact right moment. Eventually, all silent exports
1061 will make it to the top of the list. */
1063 /* Do not pay attention on 1sec or smaller renewals. */
1064 new_time = cfs_time_current_sec() + extra_delay;
1065 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1068 exp->exp_last_request_time = new_time;
1070 /* exports may get disconnected from the chain even though the
1071 export has references, so we must keep the spin lock while
1072 manipulating the lists */
1073 spin_lock(&exp->exp_obd->obd_dev_lock);
1075 if (list_empty(&exp->exp_obd_chain_timed)) {
1076 /* this one is not timed */
1077 spin_unlock(&exp->exp_obd->obd_dev_lock);
1081 list_move_tail(&exp->exp_obd_chain_timed,
1082 &exp->exp_obd->obd_exports_timed);
1084 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1085 struct obd_export, exp_obd_chain_timed);
1086 oldest_time = oldest_exp->exp_last_request_time;
1087 spin_unlock(&exp->exp_obd->obd_dev_lock);
1089 if (exp->exp_obd->obd_recovering) {
1090 /* be nice to everyone during recovery */
1095 /* Note - racing to start/reset the obd_eviction timer is safe */
1096 if (exp->exp_obd->obd_eviction_timer == 0) {
1097 /* Check if the oldest entry is expired. */
1098 if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
1100 /* We need a second timer, in case the net was down and
1101 * it just came back. Since the pinger may skip every
1102 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1103 * we better wait for 3. */
1104 exp->exp_obd->obd_eviction_timer =
1105 cfs_time_current_sec() + 3 * PING_INTERVAL;
1106 CDEBUG(D_HA, "%s: Think about evicting %s from %ld\n",
1107 exp->exp_obd->obd_name,
1108 obd_export_nid2str(oldest_exp), oldest_time);
1111 if (cfs_time_current_sec() >
1112 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1113 /* The evictor won't evict anyone who we've heard from
1114 * recently, so we don't have to check before we start
1116 if (!ping_evictor_wake(exp))
1117 exp->exp_obd->obd_eviction_timer = 0;
1125 * Sanity check request \a req.
1126 * Return 0 if all is ok, error code otherwise.
1128 static int ptlrpc_check_req(struct ptlrpc_request *req)
1130 struct obd_device *obd = req->rq_export->exp_obd;
1133 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1134 req->rq_export->exp_conn_cnt)) {
1135 DEBUG_REQ(D_RPCTRACE, req,
1136 "DROPPING req from old connection %d < %d",
1137 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1138 req->rq_export->exp_conn_cnt);
1141 if (unlikely(obd == NULL || obd->obd_fail)) {
1142 /* Failing over, don't handle any more reqs,
1143 * send error response instead. */
1144 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1145 req, (obd != NULL) ? obd->obd_name : "unknown");
1147 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1148 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1149 !obd->obd_recovering) {
1150 DEBUG_REQ(D_ERROR, req,
1151 "Invalid replay without recovery");
1152 class_fail_export(req->rq_export);
1154 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1155 !obd->obd_recovering) {
1156 DEBUG_REQ(D_ERROR, req, "Invalid req with transno "
1157 "%llu without recovery",
1158 lustre_msg_get_transno(req->rq_reqmsg));
1159 class_fail_export(req->rq_export);
1163 if (unlikely(rc < 0)) {
1164 req->rq_status = rc;
1170 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1172 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1175 if (array->paa_count == 0) {
1176 del_timer(&svcpt->scp_at_timer);
1180 /* Set timer for closest deadline */
1181 next = (__s32)(array->paa_deadline - ktime_get_real_seconds() -
1184 ptlrpc_at_timer((unsigned long)svcpt);
1186 mod_timer(&svcpt->scp_at_timer, cfs_time_shift(next));
1187 CDEBUG(D_INFO, "armed %s at %+ds\n",
1188 svcpt->scp_service->srv_name, next);
1192 /* Add rpc to early reply check list */
1193 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1195 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1196 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1197 struct ptlrpc_request *rq = NULL;
1203 if (req->rq_no_reply)
1206 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1209 spin_lock(&svcpt->scp_at_lock);
1210 LASSERT(list_empty(&req->rq_timed_list));
1212 div_u64_rem(req->rq_deadline, array->paa_size, &index);
1213 if (array->paa_reqs_count[index] > 0) {
1214 /* latest rpcs will have the latest deadlines in the list,
1215 * so search backward. */
1216 list_for_each_entry_reverse(rq,
1217 &array->paa_reqs_array[index],
1219 if (req->rq_deadline >= rq->rq_deadline) {
1220 list_add(&req->rq_timed_list,
1221 &rq->rq_timed_list);
1227 /* Add the request at the head of the list */
1228 if (list_empty(&req->rq_timed_list))
1229 list_add(&req->rq_timed_list,
1230 &array->paa_reqs_array[index]);
1232 spin_lock(&req->rq_lock);
1233 req->rq_at_linked = 1;
1234 spin_unlock(&req->rq_lock);
1235 req->rq_at_index = index;
1236 array->paa_reqs_count[index]++;
1238 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1239 array->paa_deadline = req->rq_deadline;
1240 ptlrpc_at_set_timer(svcpt);
1242 spin_unlock(&svcpt->scp_at_lock);
1248 ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1250 struct ptlrpc_at_array *array;
1252 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1254 /* NB: must call with hold svcpt::scp_at_lock */
1255 LASSERT(!list_empty(&req->rq_timed_list));
1256 list_del_init(&req->rq_timed_list);
1258 spin_lock(&req->rq_lock);
1259 req->rq_at_linked = 0;
1260 spin_unlock(&req->rq_lock);
1262 array->paa_reqs_count[req->rq_at_index]--;
1267 * Attempt to extend the request deadline by sending an early reply to the
1270 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1272 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1273 struct ptlrpc_request *reqcopy;
1274 struct lustre_msg *reqmsg;
1275 time64_t olddl = req->rq_deadline - ktime_get_real_seconds();
1281 if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_RECONNECT)) {
1282 /* don't send early reply */
1286 /* deadline is when the client expects us to reply, margin is the
1287 difference between clients' and servers' expectations */
1288 DEBUG_REQ(D_ADAPTTO, req,
1289 "%ssending early reply (deadline %+llds, margin %+llds) for "
1290 "%d+%d", AT_OFF ? "AT off - not " : "",
1291 (s64)olddl, (s64)(olddl - at_get(&svcpt->scp_at_estimate)),
1292 at_get(&svcpt->scp_at_estimate), at_extra);
1298 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+llds), "
1299 "not sending early reply. Consider increasing "
1300 "at_early_margin (%d)?", (s64)olddl, at_early_margin);
1302 /* Return an error so we're not re-added to the timed list. */
1306 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
1307 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
1308 "but no AT support");
1312 if (req->rq_export &&
1313 lustre_msg_get_flags(req->rq_reqmsg) &
1314 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1315 struct obd_device *obd_exp = req->rq_export->exp_obd;
1317 /* During recovery, we don't want to send too many early
1318 * replies, but on the other hand we want to make sure the
1319 * client has enough time to resend if the rpc is lost. So
1320 * during the recovery period send at least 4 early replies,
1321 * spacing them every at_extra if we can. at_estimate should
1322 * always equal this fixed value during recovery.
1324 /* Don't account request processing time into AT history
1325 * during recovery, it is not service time we need but
1326 * includes also waiting time for recovering clients
1328 newdl = min_t(time64_t, at_extra,
1329 obd_exp->obd_recovery_timeout / 4) +
1330 ktime_get_real_seconds();
1332 /* We want to extend the request deadline by at_extra seconds,
1333 * so we set our service estimate to reflect how much time has
1334 * passed since this request arrived plus an additional
1335 * at_extra seconds. The client will calculate the new deadline
1336 * based on this service estimate (plus some additional time to
1337 * account for network latency). See ptlrpc_at_recv_early_reply
1339 at_measured(&svcpt->scp_at_estimate, at_extra +
1340 ktime_get_real_seconds() -
1341 req->rq_arrival_time.tv_sec);
1342 newdl = req->rq_arrival_time.tv_sec +
1343 at_get(&svcpt->scp_at_estimate);
1346 /* Check to see if we've actually increased the deadline -
1347 * we may be past adaptive_max */
1348 if (req->rq_deadline >= newdl) {
1349 DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%lld/%lld), not sending early reply\n",
1350 (s64)olddl, (s64)(newdl - ktime_get_real_seconds()));
1354 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1355 if (reqcopy == NULL)
1357 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1359 GOTO(out_free, rc = -ENOMEM);
1362 reqcopy->rq_reply_state = NULL;
1363 reqcopy->rq_rep_swab_mask = 0;
1364 reqcopy->rq_pack_bulk = 0;
1365 reqcopy->rq_pack_udesc = 0;
1366 reqcopy->rq_packed_final = 0;
1367 sptlrpc_svc_ctx_addref(reqcopy);
1368 /* We only need the reqmsg for the magic */
1369 reqcopy->rq_reqmsg = reqmsg;
1370 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1373 * tgt_brw_read() and tgt_brw_write() may have decided not to reply.
1374 * Without this check, we would fail the rq_no_reply assertion in
1375 * ptlrpc_send_reply().
1377 if (reqcopy->rq_no_reply)
1378 GOTO(out, rc = -ETIMEDOUT);
1380 LASSERT(atomic_read(&req->rq_refcount));
1381 /** if it is last refcount then early reply isn't needed */
1382 if (atomic_read(&req->rq_refcount) == 1) {
1383 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1384 "abort sending early reply\n");
1385 GOTO(out, rc = -EINVAL);
1388 /* Connection ref */
1389 reqcopy->rq_export = class_conn2export(
1390 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1391 if (reqcopy->rq_export == NULL)
1392 GOTO(out, rc = -ENODEV);
1395 class_export_rpc_inc(reqcopy->rq_export);
1396 if (reqcopy->rq_export->exp_obd &&
1397 reqcopy->rq_export->exp_obd->obd_fail)
1398 GOTO(out_put, rc = -ENODEV);
1400 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1404 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1407 /* Adjust our own deadline to what we told the client */
1408 req->rq_deadline = newdl;
1409 req->rq_early_count++; /* number sent, server side */
1411 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1414 /* Free the (early) reply state from lustre_pack_reply.
1415 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1416 ptlrpc_req_drop_rs(reqcopy);
1419 class_export_rpc_dec(reqcopy->rq_export);
1420 class_export_put(reqcopy->rq_export);
1422 sptlrpc_svc_ctx_decref(reqcopy);
1423 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1425 ptlrpc_request_cache_free(reqcopy);
1429 /* Send early replies to everybody expiring within at_early_margin
1430 asking for at_extra time */
1431 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1433 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1434 struct ptlrpc_request *rq, *n;
1435 struct list_head work_list;
1438 time64_t now = ktime_get_real_seconds();
1439 cfs_duration_t delay;
1440 int first, counter = 0;
1443 spin_lock(&svcpt->scp_at_lock);
1444 if (svcpt->scp_at_check == 0) {
1445 spin_unlock(&svcpt->scp_at_lock);
1448 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1449 svcpt->scp_at_check = 0;
1451 if (array->paa_count == 0) {
1452 spin_unlock(&svcpt->scp_at_lock);
1456 /* The timer went off, but maybe the nearest rpc already completed. */
1457 first = array->paa_deadline - now;
1458 if (first > at_early_margin) {
1459 /* We've still got plenty of time. Reset the timer. */
1460 ptlrpc_at_set_timer(svcpt);
1461 spin_unlock(&svcpt->scp_at_lock);
1465 /* We're close to a timeout, and we don't know how much longer the
1466 server will take. Send early replies to everyone expiring soon. */
1467 INIT_LIST_HEAD(&work_list);
1469 div_u64_rem(array->paa_deadline, array->paa_size, &index);
1470 count = array->paa_count;
1472 count -= array->paa_reqs_count[index];
1473 list_for_each_entry_safe(rq, n,
1474 &array->paa_reqs_array[index],
1476 if (rq->rq_deadline > now + at_early_margin) {
1477 /* update the earliest deadline */
1478 if (deadline == -1 ||
1479 rq->rq_deadline < deadline)
1480 deadline = rq->rq_deadline;
1484 ptlrpc_at_remove_timed(rq);
1486 * ptlrpc_server_drop_request() may drop
1487 * refcount to 0 already. Let's check this and
1488 * don't add entry to work_list
1490 if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
1491 list_add(&rq->rq_timed_list, &work_list);
1495 if (++index >= array->paa_size)
1498 array->paa_deadline = deadline;
1499 /* we have a new earliest deadline, restart the timer */
1500 ptlrpc_at_set_timer(svcpt);
1502 spin_unlock(&svcpt->scp_at_lock);
1504 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1505 "replies\n", first, at_extra, counter);
1507 /* We're already past request deadlines before we even get a
1508 chance to send early replies */
1509 LCONSOLE_WARN("%s: This server is not able to keep up with "
1510 "request traffic (cpu-bound).\n",
1511 svcpt->scp_service->srv_name);
1512 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%ld(jiff)\n",
1513 counter, svcpt->scp_nreqs_incoming,
1514 svcpt->scp_nreqs_active,
1515 at_get(&svcpt->scp_at_estimate), delay);
1518 /* we took additional refcount so entries can't be deleted from list, no
1519 * locking is needed */
1520 while (!list_empty(&work_list)) {
1521 rq = list_entry(work_list.next, struct ptlrpc_request,
1523 list_del_init(&rq->rq_timed_list);
1525 if (ptlrpc_at_send_early_reply(rq) == 0)
1526 ptlrpc_at_add_timed(rq);
1528 ptlrpc_server_drop_request(rq);
1531 RETURN(1); /* return "did_something" for liblustre */
1534 /* Check if we are already handling earlier incarnation of this request.
1535 * Called under &req->rq_export->exp_rpc_lock locked */
1536 static int ptlrpc_server_check_resend_in_progress(struct ptlrpc_request *req)
1538 struct ptlrpc_request *tmp = NULL;
1540 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ||
1541 (atomic_read(&req->rq_export->exp_rpc_count) == 0))
1544 /* bulk request are aborted upon reconnect, don't try to
1546 if (req->rq_bulk_write || req->rq_bulk_read)
1549 /* This list should not be longer than max_requests in
1550 * flights on the client, so it is not all that long.
1551 * Also we only hit this codepath in case of a resent
1552 * request which makes it even more rarely hit */
1553 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs,
1555 /* Found duplicate one */
1556 if (tmp->rq_xid == req->rq_xid)
1559 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs,
1561 /* Found duplicate one */
1562 if (tmp->rq_xid == req->rq_xid)
1568 DEBUG_REQ(D_HA, req, "Found duplicate req in processing");
1569 DEBUG_REQ(D_HA, tmp, "Request being processed");
1574 * Check if a request should be assigned with a high priority.
1576 * \retval < 0: error occurred
1577 * 0: normal RPC request
1578 * +1: high priority request
1580 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1581 struct ptlrpc_request *req)
1586 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL) {
1587 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1594 if (req->rq_export != NULL && req->rq_ops != NULL) {
1595 /* Perform request specific check. We should do this
1596 * check before the request is added into exp_hp_rpcs
1597 * list otherwise it may hit swab race at LU-1044. */
1598 if (req->rq_ops->hpreq_check != NULL) {
1599 rc = req->rq_ops->hpreq_check(req);
1600 if (rc == -ESTALE) {
1601 req->rq_status = rc;
1604 /** can only return error,
1605 * 0 for normal request,
1606 * or 1 for high priority request */
1614 /** Remove the request from the export list. */
1615 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1618 if (req->rq_export) {
1619 /* refresh lock timeout again so that client has more
1620 * room to send lock cancel RPC. */
1621 if (req->rq_ops && req->rq_ops->hpreq_fini)
1622 req->rq_ops->hpreq_fini(req);
1624 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1625 list_del_init(&req->rq_exp_list);
1626 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1631 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1636 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1637 .hpreq_check = ptlrpc_hpreq_check,
1640 /* Hi-Priority RPC check by RPC operation code. */
1641 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1643 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1645 /* Check for export to let only reconnects for not yet evicted
1646 * export to become a HP rpc. */
1647 if ((req->rq_export != NULL) &&
1648 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1649 req->rq_ops = &ptlrpc_hpreq_common;
1653 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1655 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1656 struct ptlrpc_request *req)
1662 rc = ptlrpc_server_hpreq_init(svcpt, req);
1667 ptlrpc_nrs_req_initialize(svcpt, req, hp);
1669 if (req->rq_export != NULL) {
1670 struct obd_export *exp = req->rq_export;
1672 /* do search for duplicated xid and the adding to the list
1674 spin_lock_bh(&exp->exp_rpc_lock);
1675 rc = ptlrpc_server_check_resend_in_progress(req);
1677 spin_unlock_bh(&exp->exp_rpc_lock);
1679 ptlrpc_nrs_req_finalize(req);
1683 if (hp || req->rq_ops != NULL)
1684 list_add(&req->rq_exp_list, &exp->exp_hp_rpcs);
1686 list_add(&req->rq_exp_list, &exp->exp_reg_rpcs);
1687 spin_unlock_bh(&exp->exp_rpc_lock);
1690 /* the current thread is not the processing thread for this request
1691 * since that, but request is in exp_hp_list and can be find there.
1692 * Remove all relations between request and old thread. */
1693 req->rq_svc_thread->t_env->le_ses = NULL;
1694 req->rq_svc_thread = NULL;
1695 req->rq_session.lc_thread = NULL;
1697 ptlrpc_nrs_req_add(svcpt, req, hp);
1703 * Allow to handle high priority request
1704 * User can call it w/o any lock but need to hold
1705 * ptlrpc_service_part::scp_req_lock to get reliable result
1707 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1710 int running = svcpt->scp_nthrs_running;
1712 if (!nrs_svcpt_has_hp(svcpt))
1718 if (ptlrpc_nrs_req_throttling_nolock(svcpt, true))
1721 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1722 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1723 /* leave just 1 thread for normal RPCs */
1724 running = PTLRPC_NTHRS_INIT;
1725 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1729 if (svcpt->scp_nreqs_active >= running - 1)
1732 if (svcpt->scp_nhreqs_active == 0)
1735 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1736 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1739 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1742 return ptlrpc_server_allow_high(svcpt, force) &&
1743 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1747 * Only allow normal priority requests on a service that has a high-priority
1748 * queue if forced (i.e. cleanup), if there are other high priority requests
1749 * already being processed (i.e. those threads can service more high-priority
1750 * requests), or if there are enough idle threads that a later thread can do
1751 * a high priority request.
1752 * User can call it w/o any lock but need to hold
1753 * ptlrpc_service_part::scp_req_lock to get reliable result
1755 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1758 int running = svcpt->scp_nthrs_running;
1759 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1760 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1761 /* leave just 1 thread for normal RPCs */
1762 running = PTLRPC_NTHRS_INIT;
1763 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1770 if (ptlrpc_nrs_req_throttling_nolock(svcpt, false))
1773 if (svcpt->scp_nreqs_active < running - 2)
1776 if (svcpt->scp_nreqs_active >= running - 1)
1779 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1782 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1785 return ptlrpc_server_allow_normal(svcpt, force) &&
1786 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1790 * Returns true if there are requests available in incoming
1791 * request queue for processing and it is allowed to fetch them.
1792 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1793 * to get reliable result
1794 * \see ptlrpc_server_allow_normal
1795 * \see ptlrpc_server_allow high
1798 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1800 return ptlrpc_server_high_pending(svcpt, force) ||
1801 ptlrpc_server_normal_pending(svcpt, force);
1805 * Fetch a request for processing from queue of unprocessed requests.
1806 * Favors high-priority requests.
1807 * Returns a pointer to fetched request.
1809 static struct ptlrpc_request *
1810 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1812 struct ptlrpc_request *req = NULL;
1815 spin_lock(&svcpt->scp_req_lock);
1817 if (ptlrpc_server_high_pending(svcpt, force)) {
1818 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1820 svcpt->scp_hreq_count++;
1825 if (ptlrpc_server_normal_pending(svcpt, force)) {
1826 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1828 svcpt->scp_hreq_count = 0;
1833 spin_unlock(&svcpt->scp_req_lock);
1837 svcpt->scp_nreqs_active++;
1839 svcpt->scp_nhreqs_active++;
1841 spin_unlock(&svcpt->scp_req_lock);
1843 if (likely(req->rq_export))
1844 class_export_rpc_inc(req->rq_export);
1850 * Handle freshly incoming reqs, add to timed early reply list,
1851 * pass on to regular request queue.
1852 * All incoming requests pass through here before getting into
1853 * ptlrpc_server_handle_req later on.
1856 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1857 struct ptlrpc_thread *thread)
1859 struct ptlrpc_service *svc = svcpt->scp_service;
1860 struct ptlrpc_request *req;
1865 spin_lock(&svcpt->scp_lock);
1866 if (list_empty(&svcpt->scp_req_incoming)) {
1867 spin_unlock(&svcpt->scp_lock);
1871 req = list_entry(svcpt->scp_req_incoming.next,
1872 struct ptlrpc_request, rq_list);
1873 list_del_init(&req->rq_list);
1874 svcpt->scp_nreqs_incoming--;
1875 /* Consider this still a "queued" request as far as stats are
1877 spin_unlock(&svcpt->scp_lock);
1879 /* go through security check/transform */
1880 rc = sptlrpc_svc_unwrap_request(req);
1884 case SECSVC_COMPLETE:
1885 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1894 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1895 * redo it wouldn't be harmful.
1897 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1898 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1900 CERROR("error unpacking request: ptl %d from %s "
1901 "x%llu\n", svc->srv_req_portal,
1902 libcfs_id2str(req->rq_peer), req->rq_xid);
1907 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1909 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1910 "%llu\n", svc->srv_req_portal,
1911 libcfs_id2str(req->rq_peer), req->rq_xid);
1915 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1916 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1917 CERROR("drop incoming rpc opc %u, x%llu\n",
1918 cfs_fail_val, req->rq_xid);
1923 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1924 CERROR("wrong packet type received (type=%u) from %s\n",
1925 lustre_msg_get_type(req->rq_reqmsg),
1926 libcfs_id2str(req->rq_peer));
1930 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1934 req->rq_bulk_write = 1;
1938 case MGS_CONFIG_READ:
1939 req->rq_bulk_read = 1;
1943 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
1945 req->rq_export = class_conn2export(
1946 lustre_msg_get_handle(req->rq_reqmsg));
1947 if (req->rq_export) {
1948 rc = ptlrpc_check_req(req);
1950 rc = sptlrpc_target_export_check(req->rq_export, req);
1952 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1953 "illegal security flavor,");
1958 ptlrpc_update_export_timer(req->rq_export, 0);
1961 /* req_in handling should/must be fast */
1962 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
1963 DEBUG_REQ(D_WARNING, req, "Slow req_in handling %llds",
1964 (s64)(ktime_get_real_seconds() -
1965 req->rq_arrival_time.tv_sec));
1967 /* Set rpc server deadline and add it to the timed list */
1968 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1969 MSGHDR_AT_SUPPORT) ?
1970 /* The max time the client expects us to take */
1971 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1973 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1974 if (unlikely(deadline == 0)) {
1975 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1979 /* Skip early reply */
1980 if (OBD_FAIL_PRECHECK(OBD_FAIL_MDS_RESEND))
1981 req->rq_deadline += obd_timeout;
1983 req->rq_svc_thread = thread;
1984 if (thread != NULL) {
1985 /* initialize request session, it is needed for request
1986 * processing by target */
1987 rc = lu_context_init(&req->rq_session, LCT_SERVER_SESSION |
1990 CERROR("%s: failure to initialize session: rc = %d\n",
1991 thread->t_name, rc);
1994 req->rq_session.lc_thread = thread;
1995 lu_context_enter(&req->rq_session);
1996 thread->t_env->le_ses = &req->rq_session;
1999 ptlrpc_at_add_timed(req);
2001 /* Move it over to the request processing queue */
2002 rc = ptlrpc_server_request_add(svcpt, req);
2006 wake_up(&svcpt->scp_waitq);
2010 ptlrpc_server_finish_request(svcpt, req);
2016 * Main incoming request handling logic.
2017 * Calls handler function from service to do actual processing.
2020 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
2021 struct ptlrpc_thread *thread)
2023 struct ptlrpc_service *svc = svcpt->scp_service;
2024 struct ptlrpc_request *request;
2034 request = ptlrpc_server_request_get(svcpt, false);
2035 if (request == NULL)
2038 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
2039 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
2040 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
2041 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
2043 if (unlikely(fail_opc)) {
2044 if (request->rq_export && request->rq_ops)
2045 OBD_FAIL_TIMEOUT(fail_opc, 4);
2048 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
2050 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
2051 libcfs_debug_dumplog();
2053 work_start = ktime_get_real();
2054 arrived = timespec64_to_ktime(request->rq_arrival_time);
2055 timediff_usecs = ktime_us_delta(arrived, work_start);
2056 if (likely(svc->srv_stats != NULL)) {
2057 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
2059 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
2060 svcpt->scp_nreqs_incoming);
2061 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
2062 svcpt->scp_nreqs_active);
2063 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
2064 at_get(&svcpt->scp_at_estimate));
2067 if (likely(request->rq_export)) {
2068 if (unlikely(ptlrpc_check_req(request)))
2070 ptlrpc_update_export_timer(request->rq_export,
2071 timediff_usecs >> 19);
2074 /* Discard requests queued for longer than the deadline.
2075 The deadline is increased if we send an early reply. */
2076 if (ktime_get_real_seconds() > request->rq_deadline) {
2077 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline %lld:%llds ago\n",
2078 libcfs_id2str(request->rq_peer),
2079 request->rq_deadline -
2080 request->rq_arrival_time.tv_sec,
2081 ktime_get_real_seconds() - request->rq_deadline);
2085 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
2086 "%s:%s+%d:%d:x%llu:%s:%d\n", current_comm(),
2087 (request->rq_export ?
2088 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2089 (request->rq_export ?
2090 atomic_read(&request->rq_export->exp_refcount) : -99),
2091 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
2092 libcfs_id2str(request->rq_peer),
2093 lustre_msg_get_opc(request->rq_reqmsg));
2095 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
2096 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
2098 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
2100 /* re-assign request and sesson thread to the current one */
2101 request->rq_svc_thread = thread;
2102 if (thread != NULL) {
2103 LASSERT(request->rq_session.lc_thread == NULL);
2104 request->rq_session.lc_thread = thread;
2105 thread->t_env->le_ses = &request->rq_session;
2107 svc->srv_ops.so_req_handler(request);
2109 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
2112 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
2113 DEBUG_REQ(D_WARNING, request, "Request took longer than estimated (%lld:%llds); client may timeout.",
2114 request->rq_deadline -
2115 request->rq_arrival_time.tv_sec,
2116 ktime_get_real_seconds() - request->rq_deadline);
2119 work_end = ktime_get_real();
2120 timediff_usecs = ktime_us_delta(work_end, work_start);
2121 arrived_usecs = ktime_us_delta(work_end, arrived);
2122 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",
2124 (request->rq_export ?
2125 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2126 (request->rq_export ?
2127 atomic_read(&request->rq_export->exp_refcount) : -99),
2128 lustre_msg_get_status(request->rq_reqmsg),
2130 libcfs_id2str(request->rq_peer),
2131 lustre_msg_get_opc(request->rq_reqmsg),
2134 (request->rq_repmsg ?
2135 lustre_msg_get_transno(request->rq_repmsg) :
2136 request->rq_transno),
2138 (request->rq_repmsg ?
2139 lustre_msg_get_status(request->rq_repmsg) : -999));
2140 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2141 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2142 int opc = opcode_offset(op);
2143 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2144 LASSERT(opc < LUSTRE_MAX_OPCODES);
2145 lprocfs_counter_add(svc->srv_stats,
2146 opc + EXTRA_MAX_OPCODES,
2150 if (unlikely(request->rq_early_count)) {
2151 DEBUG_REQ(D_ADAPTTO, request,
2152 "sent %d early replies before finishing in %llds",
2153 request->rq_early_count,
2154 arrived_usecs / USEC_PER_SEC);
2157 ptlrpc_server_finish_active_request(svcpt, request);
2163 * An internal function to process a single reply state object.
2166 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2168 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2169 struct ptlrpc_service *svc = svcpt->scp_service;
2170 struct obd_export *exp;
2175 exp = rs->rs_export;
2177 LASSERT(rs->rs_difficult);
2178 LASSERT(rs->rs_scheduled);
2179 LASSERT(list_empty(&rs->rs_list));
2181 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2182 * iterates over newly committed replies, removing them from
2183 * exp_uncommitted_replies. It then drops this lock and schedules the
2184 * replies it found for handling here.
2186 * We can avoid contention for exp_uncommitted_replies_lock between the
2187 * HRT threads and further commit callbacks by checking rs_committed
2188 * which is set in the commit callback while it holds both
2189 * rs_lock and exp_uncommitted_reples.
2191 * If we see rs_committed clear, the commit callback _may_ not have
2192 * handled this reply yet and we race with it to grab
2193 * exp_uncommitted_replies_lock before removing the reply from
2194 * exp_uncommitted_replies. Note that if we lose the race and the
2195 * reply has already been removed, list_del_init() is a noop.
2197 * If we see rs_committed set, we know the commit callback is handling,
2198 * or has handled this reply since store reordering might allow us to
2199 * see rs_committed set out of sequence. But since this is done
2200 * holding rs_lock, we can be sure it has all completed once we hold
2201 * rs_lock, which we do right next.
2203 if (!rs->rs_committed) {
2204 /* if rs was commited, no need to convert locks, don't check
2205 * rs_committed here because rs may never be added into
2206 * exp_uncommitted_replies and this flag never be set, see
2207 * target_send_reply() */
2208 if (rs->rs_convert_lock &&
2209 rs->rs_transno > exp->exp_last_committed) {
2210 struct ldlm_lock *lock;
2212 spin_lock(&rs->rs_lock);
2213 if (rs->rs_convert_lock &&
2214 rs->rs_transno > exp->exp_last_committed) {
2215 nlocks = rs->rs_nlocks;
2216 while (nlocks-- > 0)
2217 rs->rs_modes[nlocks] = LCK_COS;
2218 nlocks = rs->rs_nlocks;
2219 rs->rs_convert_lock = 0;
2220 /* clear rs_scheduled so that commit callback
2221 * can schedule again */
2222 rs->rs_scheduled = 0;
2223 spin_unlock(&rs->rs_lock);
2225 while (nlocks-- > 0) {
2226 lock = ldlm_handle2lock(
2227 &rs->rs_locks[nlocks]);
2228 LASSERT(lock != NULL);
2229 ldlm_lock_downgrade(lock, LCK_COS);
2230 LDLM_LOCK_PUT(lock);
2234 spin_unlock(&rs->rs_lock);
2237 spin_lock(&exp->exp_uncommitted_replies_lock);
2238 list_del_init(&rs->rs_obd_list);
2239 spin_unlock(&exp->exp_uncommitted_replies_lock);
2242 spin_lock(&exp->exp_lock);
2243 /* Noop if removed already */
2244 list_del_init(&rs->rs_exp_list);
2245 spin_unlock(&exp->exp_lock);
2247 spin_lock(&rs->rs_lock);
2249 been_handled = rs->rs_handled;
2252 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2253 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2255 if (nlocks == 0 && !been_handled) {
2256 /* If we see this, we should already have seen the warning
2257 * in mds_steal_ack_locks() */
2258 CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld"
2261 rs->rs_xid, rs->rs_transno, rs->rs_opc,
2262 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2265 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2266 spin_unlock(&rs->rs_lock);
2268 if (!been_handled && rs->rs_on_net) {
2269 LNetMDUnlink(rs->rs_md_h);
2270 /* Ignore return code; we're racing with completion */
2273 while (nlocks-- > 0)
2274 ldlm_lock_decref(&rs->rs_locks[nlocks],
2275 rs->rs_modes[nlocks]);
2277 spin_lock(&rs->rs_lock);
2280 rs->rs_scheduled = 0;
2281 rs->rs_convert_lock = 0;
2283 if (!rs->rs_on_net) {
2285 spin_unlock(&rs->rs_lock);
2287 class_export_put (exp);
2288 rs->rs_export = NULL;
2289 ptlrpc_rs_decref(rs);
2290 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2291 svc->srv_is_stopping)
2292 wake_up_all(&svcpt->scp_waitq);
2296 /* still on the net; callback will schedule */
2297 spin_unlock(&rs->rs_lock);
2303 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2305 int avail = svcpt->scp_nrqbds_posted;
2306 int low_water = test_req_buffer_pressure ? 0 :
2307 svcpt->scp_service->srv_nbuf_per_group / 2;
2309 /* NB I'm not locking; just looking. */
2311 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2312 * allowed the request history to grow out of control. We could put a
2313 * sanity check on that here and cull some history if we need the
2316 if (avail <= low_water)
2317 ptlrpc_grow_req_bufs(svcpt, 1);
2319 if (svcpt->scp_service->srv_stats) {
2320 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2321 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2326 ptlrpc_retry_rqbds(void *arg)
2328 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2330 svcpt->scp_rqbd_timeout = 0;
2335 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2337 return svcpt->scp_nreqs_active <
2338 svcpt->scp_nthrs_running - 1 -
2339 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2343 * allowed to create more threads
2344 * user can call it w/o any lock but need to hold
2345 * ptlrpc_service_part::scp_lock to get reliable result
2348 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2350 return svcpt->scp_nthrs_running +
2351 svcpt->scp_nthrs_starting <
2352 svcpt->scp_service->srv_nthrs_cpt_limit;
2356 * too many requests and allowed to create more threads
2359 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2361 return !ptlrpc_threads_enough(svcpt) &&
2362 ptlrpc_threads_increasable(svcpt);
2366 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2368 return thread_is_stopping(thread) ||
2369 thread->t_svcpt->scp_service->srv_is_stopping;
2373 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2375 return !list_empty(&svcpt->scp_rqbd_idle) &&
2376 svcpt->scp_rqbd_timeout == 0;
2380 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2382 return svcpt->scp_at_check;
2386 * requests wait on preprocessing
2387 * user can call it w/o any lock but need to hold
2388 * ptlrpc_service_part::scp_lock to get reliable result
2391 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2393 return !list_empty(&svcpt->scp_req_incoming);
2396 static __attribute__((__noinline__)) int
2397 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2398 struct ptlrpc_thread *thread)
2400 /* Don't exit while there are replies to be handled */
2401 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2402 ptlrpc_retry_rqbds, svcpt);
2404 lc_watchdog_disable(thread->t_watchdog);
2408 l_wait_event_exclusive_head(svcpt->scp_waitq,
2409 ptlrpc_thread_stopping(thread) ||
2410 ptlrpc_server_request_incoming(svcpt) ||
2411 ptlrpc_server_request_pending(svcpt, false) ||
2412 ptlrpc_rqbd_pending(svcpt) ||
2413 ptlrpc_at_check(svcpt), &lwi);
2415 if (ptlrpc_thread_stopping(thread))
2418 lc_watchdog_touch(thread->t_watchdog,
2419 ptlrpc_server_get_timeout(svcpt));
2424 * Main thread body for service threads.
2425 * Waits in a loop waiting for new requests to process to appear.
2426 * Every time an incoming requests is added to its queue, a waitq
2427 * is woken up and one of the threads will handle it.
2429 static int ptlrpc_main(void *arg)
2431 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2432 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2433 struct ptlrpc_service *svc = svcpt->scp_service;
2434 struct ptlrpc_reply_state *rs;
2435 struct group_info *ginfo = NULL;
2437 int counter = 0, rc = 0;
2440 thread->t_pid = current_pid();
2441 unshare_fs_struct();
2443 /* NB: we will call cfs_cpt_bind() for all threads, because we
2444 * might want to run lustre server only on a subset of system CPUs,
2445 * in that case ->scp_cpt is CFS_CPT_ANY */
2446 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2448 CWARN("%s: failed to bind %s on CPT %d\n",
2449 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2452 ginfo = groups_alloc(0);
2458 set_current_groups(ginfo);
2459 put_group_info(ginfo);
2461 if (svc->srv_ops.so_thr_init != NULL) {
2462 rc = svc->srv_ops.so_thr_init(thread);
2473 rc = lu_context_init(&env->le_ctx,
2474 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2478 thread->t_env = env;
2479 env->le_ctx.lc_thread = thread;
2480 env->le_ctx.lc_cookie = 0x6;
2482 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2483 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2487 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2488 svc->srv_name, svcpt->scp_cpt, rc);
2492 /* Alloc reply state structure for this one */
2493 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2499 spin_lock(&svcpt->scp_lock);
2501 LASSERT(thread_is_starting(thread));
2502 thread_clear_flags(thread, SVC_STARTING);
2504 LASSERT(svcpt->scp_nthrs_starting == 1);
2505 svcpt->scp_nthrs_starting--;
2507 /* SVC_STOPPING may already be set here if someone else is trying
2508 * to stop the service while this new thread has been dynamically
2509 * forked. We still set SVC_RUNNING to let our creator know that
2510 * we are now running, however we will exit as soon as possible */
2511 thread_add_flags(thread, SVC_RUNNING);
2512 svcpt->scp_nthrs_running++;
2513 spin_unlock(&svcpt->scp_lock);
2515 /* wake up our creator in case he's still waiting. */
2516 wake_up(&thread->t_ctl_waitq);
2518 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2521 spin_lock(&svcpt->scp_rep_lock);
2522 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2523 wake_up(&svcpt->scp_rep_waitq);
2524 spin_unlock(&svcpt->scp_rep_lock);
2526 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2527 svcpt->scp_nthrs_running);
2529 /* XXX maintain a list of all managed devices: insert here */
2530 while (!ptlrpc_thread_stopping(thread)) {
2531 if (ptlrpc_wait_event(svcpt, thread))
2534 ptlrpc_check_rqbd_pool(svcpt);
2536 if (ptlrpc_threads_need_create(svcpt)) {
2537 /* Ignore return code - we tried... */
2538 ptlrpc_start_thread(svcpt, 0);
2541 /* reset le_ses to initial state */
2543 /* Process all incoming reqs before handling any */
2544 if (ptlrpc_server_request_incoming(svcpt)) {
2545 lu_context_enter(&env->le_ctx);
2546 ptlrpc_server_handle_req_in(svcpt, thread);
2547 lu_context_exit(&env->le_ctx);
2549 /* but limit ourselves in case of flood */
2550 if (counter++ < 100)
2555 if (ptlrpc_at_check(svcpt))
2556 ptlrpc_at_check_timed(svcpt);
2558 if (ptlrpc_server_request_pending(svcpt, false)) {
2559 lu_context_enter(&env->le_ctx);
2560 ptlrpc_server_handle_request(svcpt, thread);
2561 lu_context_exit(&env->le_ctx);
2564 if (ptlrpc_rqbd_pending(svcpt) &&
2565 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2566 /* I just failed to repost request buffers.
2567 * Wait for a timeout (unless something else
2568 * happens) before I try again */
2569 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2570 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2571 svcpt->scp_nrqbds_posted);
2575 lc_watchdog_delete(thread->t_watchdog);
2576 thread->t_watchdog = NULL;
2580 * deconstruct service specific state created by ptlrpc_start_thread()
2582 if (svc->srv_ops.so_thr_done != NULL)
2583 svc->srv_ops.so_thr_done(thread);
2586 lu_context_fini(&env->le_ctx);
2590 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2591 thread, thread->t_pid, thread->t_id, rc);
2593 spin_lock(&svcpt->scp_lock);
2594 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2595 svcpt->scp_nthrs_starting--;
2597 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2598 /* must know immediately */
2599 svcpt->scp_nthrs_running--;
2603 thread_add_flags(thread, SVC_STOPPED);
2605 wake_up(&thread->t_ctl_waitq);
2606 spin_unlock(&svcpt->scp_lock);
2611 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2612 struct list_head *replies)
2616 spin_lock(&hrt->hrt_lock);
2618 list_splice_init(&hrt->hrt_queue, replies);
2619 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2621 spin_unlock(&hrt->hrt_lock);
2626 * Main body of "handle reply" function.
2627 * It processes acked reply states
2629 static int ptlrpc_hr_main(void *arg)
2631 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2632 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2633 struct list_head replies;
2636 INIT_LIST_HEAD(&replies);
2637 unshare_fs_struct();
2639 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2641 char threadname[20];
2643 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2644 hrp->hrp_cpt, hrt->hrt_id);
2645 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2646 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2649 atomic_inc(&hrp->hrp_nstarted);
2650 wake_up(&ptlrpc_hr.hr_waitq);
2652 while (!ptlrpc_hr.hr_stopping) {
2653 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2655 while (!list_empty(&replies)) {
2656 struct ptlrpc_reply_state *rs;
2658 rs = list_entry(replies.prev,
2659 struct ptlrpc_reply_state,
2661 list_del_init(&rs->rs_list);
2662 ptlrpc_handle_rs(rs);
2666 atomic_inc(&hrp->hrp_nstopped);
2667 wake_up(&ptlrpc_hr.hr_waitq);
2672 static void ptlrpc_stop_hr_threads(void)
2674 struct ptlrpc_hr_partition *hrp;
2678 ptlrpc_hr.hr_stopping = 1;
2680 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2681 if (hrp->hrp_thrs == NULL)
2682 continue; /* uninitialized */
2683 for (j = 0; j < hrp->hrp_nthrs; j++)
2684 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2687 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2688 if (hrp->hrp_thrs == NULL)
2689 continue; /* uninitialized */
2690 wait_event(ptlrpc_hr.hr_waitq,
2691 atomic_read(&hrp->hrp_nstopped) ==
2692 atomic_read(&hrp->hrp_nstarted));
2696 static int ptlrpc_start_hr_threads(void)
2698 struct ptlrpc_hr_partition *hrp;
2703 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2706 for (j = 0; j < hrp->hrp_nthrs; j++) {
2707 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2708 struct task_struct *task;
2710 task = kthread_run(ptlrpc_hr_main,
2712 "ptlrpc_hr%02d_%03d",
2721 wait_event(ptlrpc_hr.hr_waitq,
2722 atomic_read(&hrp->hrp_nstarted) == j);
2725 CERROR("cannot start reply handler thread %d:%d: "
2726 "rc = %d\n", i, j, rc);
2727 ptlrpc_stop_hr_threads();
2735 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2737 struct l_wait_info lwi = { 0 };
2738 struct ptlrpc_thread *thread;
2739 struct list_head zombie;
2743 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2744 svcpt->scp_service->srv_name);
2746 INIT_LIST_HEAD(&zombie);
2747 spin_lock(&svcpt->scp_lock);
2748 /* let the thread know that we would like it to stop asap */
2749 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2750 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2751 svcpt->scp_service->srv_thread_name, thread->t_id);
2752 thread_add_flags(thread, SVC_STOPPING);
2755 wake_up_all(&svcpt->scp_waitq);
2757 while (!list_empty(&svcpt->scp_threads)) {
2758 thread = list_entry(svcpt->scp_threads.next,
2759 struct ptlrpc_thread, t_link);
2760 if (thread_is_stopped(thread)) {
2761 list_del(&thread->t_link);
2762 list_add(&thread->t_link, &zombie);
2765 spin_unlock(&svcpt->scp_lock);
2767 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2768 svcpt->scp_service->srv_thread_name, thread->t_id);
2769 l_wait_event(thread->t_ctl_waitq,
2770 thread_is_stopped(thread), &lwi);
2772 spin_lock(&svcpt->scp_lock);
2775 spin_unlock(&svcpt->scp_lock);
2777 while (!list_empty(&zombie)) {
2778 thread = list_entry(zombie.next,
2779 struct ptlrpc_thread, t_link);
2780 list_del(&thread->t_link);
2781 OBD_FREE_PTR(thread);
2787 * Stops all threads of a particular service \a svc
2789 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2791 struct ptlrpc_service_part *svcpt;
2795 ptlrpc_service_for_each_part(svcpt, i, svc) {
2796 if (svcpt->scp_service != NULL)
2797 ptlrpc_svcpt_stop_threads(svcpt);
2803 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2810 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2811 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2813 for (i = 0; i < svc->srv_ncpts; i++) {
2814 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2815 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2821 /* We have enough threads, don't start more. b=15759 */
2828 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2829 svc->srv_thread_name, i, j, rc);
2830 ptlrpc_stop_all_threads(svc);
2834 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2836 struct l_wait_info lwi = { 0 };
2837 struct ptlrpc_thread *thread;
2838 struct ptlrpc_service *svc;
2839 struct task_struct *task;
2843 LASSERT(svcpt != NULL);
2845 svc = svcpt->scp_service;
2847 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2848 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2849 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2852 if (unlikely(svc->srv_is_stopping))
2855 if (!ptlrpc_threads_increasable(svcpt) ||
2856 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2857 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2860 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
2863 init_waitqueue_head(&thread->t_ctl_waitq);
2865 spin_lock(&svcpt->scp_lock);
2866 if (!ptlrpc_threads_increasable(svcpt)) {
2867 spin_unlock(&svcpt->scp_lock);
2868 OBD_FREE_PTR(thread);
2872 if (svcpt->scp_nthrs_starting != 0) {
2873 /* serialize starting because some modules (obdfilter)
2874 * might require unique and contiguous t_id */
2875 LASSERT(svcpt->scp_nthrs_starting == 1);
2876 spin_unlock(&svcpt->scp_lock);
2877 OBD_FREE_PTR(thread);
2879 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2880 svc->srv_thread_name, svcpt->scp_thr_nextid);
2885 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2886 svc->srv_thread_name, svcpt->scp_thr_nextid);
2890 svcpt->scp_nthrs_starting++;
2891 thread->t_id = svcpt->scp_thr_nextid++;
2892 thread_add_flags(thread, SVC_STARTING);
2893 thread->t_svcpt = svcpt;
2895 list_add(&thread->t_link, &svcpt->scp_threads);
2896 spin_unlock(&svcpt->scp_lock);
2898 if (svcpt->scp_cpt >= 0) {
2899 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s%02d_%03d",
2900 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2902 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s_%04d",
2903 svc->srv_thread_name, thread->t_id);
2906 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2907 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
2910 CERROR("cannot start thread '%s': rc = %d\n",
2911 thread->t_name, rc);
2912 spin_lock(&svcpt->scp_lock);
2913 --svcpt->scp_nthrs_starting;
2914 if (thread_is_stopping(thread)) {
2915 /* this ptlrpc_thread is being hanled
2916 * by ptlrpc_svcpt_stop_threads now
2918 thread_add_flags(thread, SVC_STOPPED);
2919 wake_up(&thread->t_ctl_waitq);
2920 spin_unlock(&svcpt->scp_lock);
2922 list_del(&thread->t_link);
2923 spin_unlock(&svcpt->scp_lock);
2924 OBD_FREE_PTR(thread);
2932 l_wait_event(thread->t_ctl_waitq,
2933 thread_is_running(thread) || thread_is_stopped(thread),
2936 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2940 int ptlrpc_hr_init(void)
2942 struct ptlrpc_hr_partition *hrp;
2943 struct ptlrpc_hr_thread *hrt;
2950 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2951 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2953 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2955 if (ptlrpc_hr.hr_partitions == NULL)
2958 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2960 weight = cpumask_weight(topology_sibling_cpumask(smp_processor_id()));
2962 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
2965 atomic_set(&hrp->hrp_nstarted, 0);
2966 atomic_set(&hrp->hrp_nstopped, 0);
2968 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, cpt);
2969 hrp->hrp_nthrs /= weight;
2970 if (hrp->hrp_nthrs == 0)
2973 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, cpt,
2974 hrp->hrp_nthrs * sizeof(*hrt));
2975 if (hrp->hrp_thrs == NULL)
2976 GOTO(out, rc = -ENOMEM);
2978 for (i = 0; i < hrp->hrp_nthrs; i++) {
2979 hrt = &hrp->hrp_thrs[i];
2982 hrt->hrt_partition = hrp;
2983 init_waitqueue_head(&hrt->hrt_waitq);
2984 spin_lock_init(&hrt->hrt_lock);
2985 INIT_LIST_HEAD(&hrt->hrt_queue);
2989 rc = ptlrpc_start_hr_threads();
2996 void ptlrpc_hr_fini(void)
2998 struct ptlrpc_hr_partition *hrp;
3001 if (ptlrpc_hr.hr_partitions == NULL)
3004 ptlrpc_stop_hr_threads();
3006 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3007 if (hrp->hrp_thrs != NULL) {
3008 OBD_FREE(hrp->hrp_thrs,
3009 hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
3013 cfs_percpt_free(ptlrpc_hr.hr_partitions);
3014 ptlrpc_hr.hr_partitions = NULL;
3019 * Wait until all already scheduled replies are processed.
3021 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
3025 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
3028 rc = l_wait_event(svcpt->scp_waitq,
3029 atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
3032 CWARN("Unexpectedly long timeout %s %p\n",
3033 svcpt->scp_service->srv_name, svcpt->scp_service);
3038 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
3040 struct ptlrpc_service_part *svcpt;
3043 /* early disarm AT timer... */
3044 ptlrpc_service_for_each_part(svcpt, i, svc) {
3045 if (svcpt->scp_service != NULL)
3046 del_timer(&svcpt->scp_at_timer);
3051 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
3053 struct ptlrpc_service_part *svcpt;
3054 struct ptlrpc_request_buffer_desc *rqbd;
3055 struct l_wait_info lwi;
3059 /* All history will be culled when the next request buffer is
3060 * freed in ptlrpc_service_purge_all() */
3061 svc->srv_hist_nrqbds_cpt_max = 0;
3063 rc = LNetClearLazyPortal(svc->srv_req_portal);
3066 ptlrpc_service_for_each_part(svcpt, i, svc) {
3067 if (svcpt->scp_service == NULL)
3070 /* Unlink all the request buffers. This forces a 'final'
3071 * event with its 'unlink' flag set for each posted rqbd */
3072 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
3074 rc = LNetMDUnlink(rqbd->rqbd_md_h);
3075 LASSERT(rc == 0 || rc == -ENOENT);
3079 ptlrpc_service_for_each_part(svcpt, i, svc) {
3080 if (svcpt->scp_service == NULL)
3083 /* Wait for the network to release any buffers
3084 * it's currently filling */
3085 spin_lock(&svcpt->scp_lock);
3086 while (svcpt->scp_nrqbds_posted != 0) {
3087 spin_unlock(&svcpt->scp_lock);
3088 /* Network access will complete in finite time but
3089 * the HUGE timeout lets us CWARN for visibility
3090 * of sluggish NALs */
3091 lwi = LWI_TIMEOUT_INTERVAL(
3092 cfs_time_seconds(LONG_UNLINK),
3093 cfs_time_seconds(1), NULL, NULL);
3094 rc = l_wait_event(svcpt->scp_waitq,
3095 svcpt->scp_nrqbds_posted == 0, &lwi);
3096 if (rc == -ETIMEDOUT) {
3097 CWARN("Service %s waiting for "
3098 "request buffers\n",
3099 svcpt->scp_service->srv_name);
3101 spin_lock(&svcpt->scp_lock);
3103 spin_unlock(&svcpt->scp_lock);
3108 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
3110 struct ptlrpc_service_part *svcpt;
3111 struct ptlrpc_request_buffer_desc *rqbd;
3112 struct ptlrpc_request *req;
3113 struct ptlrpc_reply_state *rs;
3116 ptlrpc_service_for_each_part(svcpt, i, svc) {
3117 if (svcpt->scp_service == NULL)
3120 spin_lock(&svcpt->scp_rep_lock);
3121 while (!list_empty(&svcpt->scp_rep_active)) {
3122 rs = list_entry(svcpt->scp_rep_active.next,
3123 struct ptlrpc_reply_state, rs_list);
3124 spin_lock(&rs->rs_lock);
3125 ptlrpc_schedule_difficult_reply(rs);
3126 spin_unlock(&rs->rs_lock);
3128 spin_unlock(&svcpt->scp_rep_lock);
3130 /* purge the request queue. NB No new replies (rqbds
3131 * all unlinked) and no service threads, so I'm the only
3132 * thread noodling the request queue now */
3133 while (!list_empty(&svcpt->scp_req_incoming)) {
3134 req = list_entry(svcpt->scp_req_incoming.next,
3135 struct ptlrpc_request, rq_list);
3137 list_del(&req->rq_list);
3138 svcpt->scp_nreqs_incoming--;
3139 ptlrpc_server_finish_request(svcpt, req);
3142 while (ptlrpc_server_request_pending(svcpt, true)) {
3143 req = ptlrpc_server_request_get(svcpt, true);
3144 ptlrpc_server_finish_active_request(svcpt, req);
3147 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
3148 LASSERT(svcpt->scp_nreqs_incoming == 0);
3149 LASSERT(svcpt->scp_nreqs_active == 0);
3150 /* history should have been culled by
3151 * ptlrpc_server_finish_request */
3152 LASSERT(svcpt->scp_hist_nrqbds == 0);
3154 /* Now free all the request buffers since nothing
3155 * references them any more... */
3157 while (!list_empty(&svcpt->scp_rqbd_idle)) {
3158 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
3159 struct ptlrpc_request_buffer_desc,
3161 ptlrpc_free_rqbd(rqbd);
3163 ptlrpc_wait_replies(svcpt);
3165 while (!list_empty(&svcpt->scp_rep_idle)) {
3166 rs = list_entry(svcpt->scp_rep_idle.next,
3167 struct ptlrpc_reply_state,
3169 list_del(&rs->rs_list);
3170 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
3176 ptlrpc_service_free(struct ptlrpc_service *svc)
3178 struct ptlrpc_service_part *svcpt;
3179 struct ptlrpc_at_array *array;
3182 ptlrpc_service_for_each_part(svcpt, i, svc) {
3183 if (svcpt->scp_service == NULL)
3186 /* In case somebody rearmed this in the meantime */
3187 del_timer(&svcpt->scp_at_timer);
3188 array = &svcpt->scp_at_array;
3190 if (array->paa_reqs_array != NULL) {
3191 OBD_FREE(array->paa_reqs_array,
3192 sizeof(struct list_head) * array->paa_size);
3193 array->paa_reqs_array = NULL;
3196 if (array->paa_reqs_count != NULL) {
3197 OBD_FREE(array->paa_reqs_count,
3198 sizeof(__u32) * array->paa_size);
3199 array->paa_reqs_count = NULL;
3203 ptlrpc_service_for_each_part(svcpt, i, svc)
3204 OBD_FREE_PTR(svcpt);
3206 if (svc->srv_cpts != NULL)
3207 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3209 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3210 srv_parts[svc->srv_ncpts]));
3213 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3217 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3219 service->srv_is_stopping = 1;
3221 mutex_lock(&ptlrpc_all_services_mutex);
3222 list_del_init(&service->srv_list);
3223 mutex_unlock(&ptlrpc_all_services_mutex);
3225 ptlrpc_service_del_atimer(service);
3226 ptlrpc_stop_all_threads(service);
3228 ptlrpc_service_unlink_rqbd(service);
3229 ptlrpc_service_purge_all(service);
3230 ptlrpc_service_nrs_cleanup(service);
3232 ptlrpc_lprocfs_unregister_service(service);
3234 ptlrpc_service_free(service);
3238 EXPORT_SYMBOL(ptlrpc_unregister_service);
3241 * Returns 0 if the service is healthy.
3243 * Right now, it just checks to make sure that requests aren't languishing
3244 * in the queue. We'll use this health check to govern whether a node needs
3245 * to be shot, so it's intentionally non-aggressive. */
3246 static int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3248 struct ptlrpc_request *request = NULL;
3249 struct timespec64 right_now;
3250 struct timespec64 timediff;
3252 ktime_get_real_ts64(&right_now);
3254 spin_lock(&svcpt->scp_req_lock);
3255 /* How long has the next entry been waiting? */
3256 if (ptlrpc_server_high_pending(svcpt, true))
3257 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3258 else if (ptlrpc_server_normal_pending(svcpt, true))
3259 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3261 if (request == NULL) {
3262 spin_unlock(&svcpt->scp_req_lock);
3266 timediff = timespec64_sub(right_now, request->rq_arrival_time);
3267 spin_unlock(&svcpt->scp_req_lock);
3269 if ((timediff.tv_sec) >
3270 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3271 CERROR("%s: unhealthy - request has been waiting %llds\n",
3272 svcpt->scp_service->srv_name, (s64)timediff.tv_sec);
3280 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3282 struct ptlrpc_service_part *svcpt;
3288 ptlrpc_service_for_each_part(svcpt, i, svc) {
3289 int rc = ptlrpc_svcpt_health_check(svcpt);
3296 EXPORT_SYMBOL(ptlrpc_service_health_check);