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, 2017, 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
35 #include <linux/kthread.h>
36 #include <obd_support.h>
37 #include <obd_class.h>
38 #include <lustre_net.h>
39 #include <lu_object.h>
40 #include <uapi/linux/lnet/lnet-types.h>
41 #include "ptlrpc_internal.h"
43 /* The following are visible and mutable through /sys/module/ptlrpc */
44 int test_req_buffer_pressure = 0;
45 module_param(test_req_buffer_pressure, int, 0444);
46 MODULE_PARM_DESC(test_req_buffer_pressure, "set non-zero to put pressure on request buffer pools");
47 module_param(at_min, int, 0644);
48 MODULE_PARM_DESC(at_min, "Adaptive timeout minimum (sec)");
49 module_param(at_max, int, 0644);
50 MODULE_PARM_DESC(at_max, "Adaptive timeout maximum (sec)");
51 module_param(at_history, int, 0644);
52 MODULE_PARM_DESC(at_history,
53 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
54 module_param(at_early_margin, int, 0644);
55 MODULE_PARM_DESC(at_early_margin, "How soon before an RPC deadline to send an early reply");
56 module_param(at_extra, int, 0644);
57 MODULE_PARM_DESC(at_extra, "How much extra time to give with each early reply");
60 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt);
61 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req);
62 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req);
64 /** Holds a list of all PTLRPC services */
65 struct list_head ptlrpc_all_services;
66 /** Used to protect the \e ptlrpc_all_services list */
67 struct mutex ptlrpc_all_services_mutex;
69 static struct ptlrpc_request_buffer_desc *
70 ptlrpc_alloc_rqbd(struct ptlrpc_service_part *svcpt)
72 struct ptlrpc_service *svc = svcpt->scp_service;
73 struct ptlrpc_request_buffer_desc *rqbd;
75 OBD_CPT_ALLOC_PTR(rqbd, svc->srv_cptable, svcpt->scp_cpt);
79 rqbd->rqbd_svcpt = svcpt;
80 rqbd->rqbd_refcount = 0;
81 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
82 rqbd->rqbd_cbid.cbid_arg = rqbd;
83 INIT_LIST_HEAD(&rqbd->rqbd_reqs);
84 OBD_CPT_ALLOC_LARGE(rqbd->rqbd_buffer, svc->srv_cptable,
85 svcpt->scp_cpt, svc->srv_buf_size);
86 if (rqbd->rqbd_buffer == NULL) {
91 spin_lock(&svcpt->scp_lock);
92 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
93 svcpt->scp_nrqbds_total++;
94 spin_unlock(&svcpt->scp_lock);
100 ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
102 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
104 LASSERT(rqbd->rqbd_refcount == 0);
105 LASSERT(list_empty(&rqbd->rqbd_reqs));
107 spin_lock(&svcpt->scp_lock);
108 list_del(&rqbd->rqbd_list);
109 svcpt->scp_nrqbds_total--;
110 spin_unlock(&svcpt->scp_lock);
112 OBD_FREE_LARGE(rqbd->rqbd_buffer, svcpt->scp_service->srv_buf_size);
117 ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
119 struct ptlrpc_service *svc = svcpt->scp_service;
120 struct ptlrpc_request_buffer_desc *rqbd;
124 if (svcpt->scp_rqbd_allocating)
127 spin_lock(&svcpt->scp_lock);
128 /* check again with lock */
129 if (svcpt->scp_rqbd_allocating) {
130 /* NB: we might allow more than one thread in the future */
131 LASSERT(svcpt->scp_rqbd_allocating == 1);
132 spin_unlock(&svcpt->scp_lock);
136 svcpt->scp_rqbd_allocating++;
137 spin_unlock(&svcpt->scp_lock);
140 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
141 /* NB: another thread might have recycled enough rqbds, we
142 * need to make sure it wouldn't over-allocate, see LU-1212. */
143 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group ||
144 (svc->srv_nrqbds_max != 0 &&
145 svcpt->scp_nrqbds_total > svc->srv_nrqbds_max))
148 rqbd = ptlrpc_alloc_rqbd(svcpt);
151 CERROR("%s: Can't allocate request buffer\n",
158 spin_lock(&svcpt->scp_lock);
160 LASSERT(svcpt->scp_rqbd_allocating == 1);
161 svcpt->scp_rqbd_allocating--;
163 spin_unlock(&svcpt->scp_lock);
166 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
167 svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted,
168 svcpt->scp_nrqbds_total, rc);
172 rc = ptlrpc_server_post_idle_rqbds(svcpt);
178 * Part of Rep-Ack logic.
179 * Puts a lock and its mode into reply state assotiated to request reply.
182 ptlrpc_save_lock(struct ptlrpc_request *req, struct lustre_handle *lock,
183 int mode, bool no_ack, bool convert_lock)
185 struct ptlrpc_reply_state *rs = req->rq_reply_state;
189 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
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;
198 EXPORT_SYMBOL(ptlrpc_save_lock);
201 struct ptlrpc_hr_partition;
203 struct ptlrpc_hr_thread {
204 int hrt_id; /* thread ID */
206 wait_queue_head_t hrt_waitq;
207 struct list_head hrt_queue;
208 struct ptlrpc_hr_partition *hrt_partition;
211 struct ptlrpc_hr_partition {
212 /* # of started threads */
213 atomic_t hrp_nstarted;
214 /* # of stopped threads */
215 atomic_t hrp_nstopped;
216 /* cpu partition id */
218 /* round-robin rotor for choosing thread */
220 /* total number of threads on this partition */
223 struct ptlrpc_hr_thread *hrp_thrs;
226 #define HRT_RUNNING 0
227 #define HRT_STOPPING 1
229 struct ptlrpc_hr_service {
230 /* CPU partition table, it's just cfs_cpt_table for now */
231 struct cfs_cpt_table *hr_cpt_table;
232 /** controller sleep waitq */
233 wait_queue_head_t hr_waitq;
234 unsigned int hr_stopping;
235 /** roundrobin rotor for non-affinity service */
236 unsigned int hr_rotor;
238 struct ptlrpc_hr_partition **hr_partitions;
242 struct list_head rsb_replies;
243 unsigned int rsb_n_replies;
244 struct ptlrpc_service_part *rsb_svcpt;
247 /** reply handling service. */
248 static struct ptlrpc_hr_service ptlrpc_hr;
251 * maximum mumber of replies scheduled in one batch
253 #define MAX_SCHEDULED 256
256 * Initialize a reply batch.
260 static void rs_batch_init(struct rs_batch *b)
262 memset(b, 0, sizeof *b);
263 INIT_LIST_HEAD(&b->rsb_replies);
267 * Choose an hr thread to dispatch requests to.
269 static struct ptlrpc_hr_thread *
270 ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
272 struct ptlrpc_hr_partition *hrp;
275 if (svcpt->scp_cpt >= 0 &&
276 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
277 /* directly match partition */
278 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
281 rotor = ptlrpc_hr.hr_rotor++;
282 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
284 hrp = ptlrpc_hr.hr_partitions[rotor];
287 rotor = hrp->hrp_rotor++;
288 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
292 * Dispatch all replies accumulated in the batch to one from
293 * dedicated reply handling threads.
297 static void rs_batch_dispatch(struct rs_batch *b)
299 if (b->rsb_n_replies != 0) {
300 struct ptlrpc_hr_thread *hrt;
302 hrt = ptlrpc_hr_select(b->rsb_svcpt);
304 spin_lock(&hrt->hrt_lock);
305 list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
306 spin_unlock(&hrt->hrt_lock);
308 wake_up(&hrt->hrt_waitq);
309 b->rsb_n_replies = 0;
314 * Add a reply to a batch.
315 * Add one reply object to a batch, schedule batched replies if overload.
320 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
322 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
324 if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
325 if (b->rsb_svcpt != NULL) {
326 rs_batch_dispatch(b);
327 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
329 spin_lock(&svcpt->scp_rep_lock);
330 b->rsb_svcpt = svcpt;
332 spin_lock(&rs->rs_lock);
333 rs->rs_scheduled_ever = 1;
334 if (rs->rs_scheduled == 0) {
335 list_move(&rs->rs_list, &b->rsb_replies);
336 rs->rs_scheduled = 1;
339 rs->rs_committed = 1;
340 spin_unlock(&rs->rs_lock);
344 * Reply batch finalization.
345 * Dispatch remaining replies from the batch
346 * and release remaining spinlock.
350 static void rs_batch_fini(struct rs_batch *b)
352 if (b->rsb_svcpt != NULL) {
353 rs_batch_dispatch(b);
354 spin_unlock(&b->rsb_svcpt->scp_rep_lock);
358 #define DECLARE_RS_BATCH(b) struct rs_batch b
362 * Put reply state into a queue for processing because we received
363 * ACK from the client
365 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
367 struct ptlrpc_hr_thread *hrt;
370 LASSERT(list_empty(&rs->rs_list));
372 hrt = ptlrpc_hr_select(rs->rs_svcpt);
374 spin_lock(&hrt->hrt_lock);
375 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
376 spin_unlock(&hrt->hrt_lock);
378 wake_up(&hrt->hrt_waitq);
383 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
387 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
388 assert_spin_locked(&rs->rs_lock);
389 LASSERT (rs->rs_difficult);
390 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
392 if (rs->rs_scheduled) { /* being set up or already notified */
397 rs->rs_scheduled = 1;
398 list_del_init(&rs->rs_list);
399 ptlrpc_dispatch_difficult_reply(rs);
402 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
404 void ptlrpc_commit_replies(struct obd_export *exp)
406 struct ptlrpc_reply_state *rs, *nxt;
407 DECLARE_RS_BATCH(batch);
410 rs_batch_init(&batch);
411 /* Find any replies that have been committed and get their service
412 * to attend to complete them. */
414 /* CAVEAT EMPTOR: spinlock ordering!!! */
415 spin_lock(&exp->exp_uncommitted_replies_lock);
416 list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
418 LASSERT (rs->rs_difficult);
419 /* VBR: per-export last_committed */
420 LASSERT(rs->rs_export);
421 if (rs->rs_transno <= exp->exp_last_committed) {
422 list_del_init(&rs->rs_obd_list);
423 rs_batch_add(&batch, rs);
426 spin_unlock(&exp->exp_uncommitted_replies_lock);
427 rs_batch_fini(&batch);
432 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
434 struct ptlrpc_request_buffer_desc *rqbd;
439 spin_lock(&svcpt->scp_lock);
441 if (list_empty(&svcpt->scp_rqbd_idle)) {
442 spin_unlock(&svcpt->scp_lock);
446 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
447 struct ptlrpc_request_buffer_desc,
449 list_del(&rqbd->rqbd_list);
451 /* assume we will post successfully */
452 svcpt->scp_nrqbds_posted++;
453 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
455 spin_unlock(&svcpt->scp_lock);
457 rc = ptlrpc_register_rqbd(rqbd);
464 spin_lock(&svcpt->scp_lock);
466 svcpt->scp_nrqbds_posted--;
467 list_del(&rqbd->rqbd_list);
468 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
470 /* Don't complain if no request buffers are posted right now; LNET
471 * won't drop requests because we set the portal lazy! */
473 spin_unlock(&svcpt->scp_lock);
478 static void ptlrpc_at_timer(cfs_timer_cb_arg_t data)
480 struct ptlrpc_service_part *svcpt;
482 svcpt = cfs_from_timer(svcpt, data, scp_at_timer);
484 svcpt->scp_at_check = 1;
485 svcpt->scp_at_checktime = ktime_get();
486 wake_up(&svcpt->scp_waitq);
490 ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
491 struct ptlrpc_service_conf *conf)
493 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
500 * Common code for estimating & validating threads number.
501 * CPT affinity service could have percpt thread-pool instead
502 * of a global thread-pool, which means user might not always
503 * get the threads number they give it in conf::tc_nthrs_user
504 * even they did set. It's because we need to validate threads
505 * number for each CPT to guarantee each pool will have enough
506 * threads to keep the service healthy.
508 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
509 init = max_t(int, init, tc->tc_nthrs_init);
511 /* NB: please see comments in lustre_lnet.h for definition
512 * details of these members */
513 LASSERT(tc->tc_nthrs_max != 0);
515 if (tc->tc_nthrs_user != 0) {
516 /* In case there is a reason to test a service with many
517 * threads, we give a less strict check here, it can
518 * be up to 8 * nthrs_max */
519 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
520 nthrs = total / svc->srv_ncpts;
521 init = max(init, nthrs);
525 total = tc->tc_nthrs_max;
526 if (tc->tc_nthrs_base == 0) {
527 /* don't care about base threads number per partition,
528 * this is most for non-affinity service */
529 nthrs = total / svc->srv_ncpts;
533 nthrs = tc->tc_nthrs_base;
534 if (svc->srv_ncpts == 1) {
537 /* NB: Increase the base number if it's single partition
538 * and total number of cores/HTs is larger or equal to 4.
539 * result will always < 2 * nthrs_base */
540 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
541 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
542 (tc->tc_nthrs_base >> i) != 0; i++)
543 nthrs += tc->tc_nthrs_base >> i;
546 if (tc->tc_thr_factor != 0) {
547 int factor = tc->tc_thr_factor;
551 * User wants to increase number of threads with for
552 * each CPU core/HT, most likely the factor is larger than
553 * one thread/core because service threads are supposed to
554 * be blocked by lock or wait for IO.
557 * Amdahl's law says that adding processors wouldn't give
558 * a linear increasing of parallelism, so it's nonsense to
559 * have too many threads no matter how many cores/HTs
562 if (cpumask_weight(topology_sibling_cpumask(smp_processor_id())) > 1) {
563 /* weight is # of HTs */
564 /* depress thread factor for hyper-thread */
565 factor = factor - (factor >> 1) + (factor >> 3);
568 weight = cfs_cpt_weight(svc->srv_cptable, 0);
570 for (; factor > 0 && weight > 0; factor--, weight -= fade)
571 nthrs += min(weight, fade) * factor;
574 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
575 nthrs = max(tc->tc_nthrs_base,
576 tc->tc_nthrs_max / svc->srv_ncpts);
579 nthrs = max(nthrs, tc->tc_nthrs_init);
580 svc->srv_nthrs_cpt_limit = nthrs;
581 svc->srv_nthrs_cpt_init = init;
583 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
584 CDEBUG(D_OTHER, "%s: This service may have more threads (%d) "
585 "than the given soft limit (%d)\n",
586 svc->srv_name, nthrs * svc->srv_ncpts,
592 * Initialize percpt data for a service
595 ptlrpc_service_part_init(struct ptlrpc_service *svc,
596 struct ptlrpc_service_part *svcpt, int cpt)
598 struct ptlrpc_at_array *array;
603 svcpt->scp_cpt = cpt;
604 INIT_LIST_HEAD(&svcpt->scp_threads);
606 /* rqbd and incoming request queue */
607 spin_lock_init(&svcpt->scp_lock);
608 mutex_init(&svcpt->scp_mutex);
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 cfs_timer_setup(&svcpt->scp_at_timer, ptlrpc_at_timer,
651 (unsigned long)svcpt, 0);
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,
691 struct dentry *debugfs_entry)
693 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
694 struct ptlrpc_service *service;
695 struct ptlrpc_service_part *svcpt;
696 struct cfs_cpt_table *cptable;
704 LASSERT(conf->psc_buf.bc_nbufs > 0);
705 LASSERT(conf->psc_buf.bc_buf_size >=
706 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
707 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
709 cptable = cconf->cc_cptable;
711 cptable = cfs_cpt_table;
713 if (conf->psc_thr.tc_cpu_bind > 1) {
714 CERROR("%s: Invalid cpu bind value %d, only 1 or 0 allowed\n",
715 conf->psc_name, conf->psc_thr.tc_cpu_bind);
716 RETURN(ERR_PTR(-EINVAL));
719 if (!cconf->cc_affinity) {
722 ncpts = cfs_cpt_number(cptable);
723 if (cconf->cc_pattern != NULL) {
724 struct cfs_expr_list *el;
726 rc = cfs_expr_list_parse(cconf->cc_pattern,
727 strlen(cconf->cc_pattern),
730 CERROR("%s: invalid CPT pattern string: %s",
731 conf->psc_name, cconf->cc_pattern);
732 RETURN(ERR_PTR(-EINVAL));
735 rc = cfs_expr_list_values(el, ncpts, &cpts);
736 cfs_expr_list_free(el);
738 CERROR("%s: failed to parse CPT array %s: %d\n",
739 conf->psc_name, cconf->cc_pattern, rc);
741 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
742 RETURN(ERR_PTR(rc < 0 ? rc : -EINVAL));
748 OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
749 if (service == NULL) {
751 OBD_FREE(cpts, sizeof(*cpts) * ncpts);
752 RETURN(ERR_PTR(-ENOMEM));
755 service->srv_cptable = cptable;
756 service->srv_cpts = cpts;
757 service->srv_ncpts = ncpts;
758 service->srv_cpt_bind = conf->psc_thr.tc_cpu_bind;
760 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
761 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
762 service->srv_cpt_bits++;
765 spin_lock_init(&service->srv_lock);
766 service->srv_name = conf->psc_name;
767 service->srv_watchdog_factor = conf->psc_watchdog_factor;
768 INIT_LIST_HEAD(&service->srv_list); /* for safty of cleanup */
770 /* buffer configuration */
771 service->srv_nbuf_per_group = test_req_buffer_pressure ?
772 1 : conf->psc_buf.bc_nbufs;
773 /* do not limit max number of rqbds by default */
774 service->srv_nrqbds_max = 0;
776 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
778 service->srv_buf_size = conf->psc_buf.bc_buf_size;
779 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
780 service->srv_req_portal = conf->psc_buf.bc_req_portal;
782 /* Increase max reply size to next power of two */
783 service->srv_max_reply_size = 1;
784 while (service->srv_max_reply_size <
785 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
786 service->srv_max_reply_size <<= 1;
788 service->srv_thread_name = conf->psc_thr.tc_thr_name;
789 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
790 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
791 service->srv_ops = conf->psc_ops;
793 for (i = 0; i < ncpts; i++) {
794 if (!cconf->cc_affinity)
797 cpt = cpts != NULL ? cpts[i] : i;
799 OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
801 GOTO(failed, rc = -ENOMEM);
803 service->srv_parts[i] = svcpt;
804 rc = ptlrpc_service_part_init(service, svcpt, cpt);
809 ptlrpc_server_nthreads_check(service, conf);
811 rc = LNetSetLazyPortal(service->srv_req_portal);
814 mutex_lock(&ptlrpc_all_services_mutex);
815 list_add(&service->srv_list, &ptlrpc_all_services);
816 mutex_unlock(&ptlrpc_all_services_mutex);
819 rc = ptlrpc_sysfs_register_service(parent, service);
824 if (debugfs_entry != NULL)
825 ptlrpc_ldebugfs_register_service(debugfs_entry, service);
827 rc = ptlrpc_service_nrs_setup(service);
831 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
832 service->srv_name, service->srv_req_portal);
834 rc = ptlrpc_start_threads(service);
836 CERROR("Failed to start threads for service %s: %d\n",
837 service->srv_name, rc);
843 ptlrpc_unregister_service(service);
846 EXPORT_SYMBOL(ptlrpc_register_service);
849 * to actually free the request, must be called without holding svc_lock.
850 * note it's caller's responsibility to unlink req->rq_list.
852 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
854 LASSERT(atomic_read(&req->rq_refcount) == 0);
855 LASSERT(list_empty(&req->rq_timed_list));
857 /* DEBUG_REQ() assumes the reply state of a request with a valid
858 * ref will not be destroyed until that reference is dropped. */
859 ptlrpc_req_drop_rs(req);
861 sptlrpc_svc_ctx_decref(req);
863 if (req != &req->rq_rqbd->rqbd_req) {
864 /* NB request buffers use an embedded
865 * req if the incoming req unlinked the
866 * MD; this isn't one of them! */
867 ptlrpc_request_cache_free(req);
872 * drop a reference count of the request. if it reaches 0, we either
873 * put it into history list, or free it immediately.
875 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
877 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
878 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
879 struct ptlrpc_service *svc = svcpt->scp_service;
881 struct list_head *tmp;
882 struct list_head *nxt;
884 if (!atomic_dec_and_test(&req->rq_refcount))
887 if (req->rq_session.lc_state == LCS_ENTERED) {
888 lu_context_exit(&req->rq_session);
889 lu_context_fini(&req->rq_session);
892 if (req->rq_at_linked) {
893 spin_lock(&svcpt->scp_at_lock);
894 /* recheck with lock, in case it's unlinked by
895 * ptlrpc_at_check_timed() */
896 if (likely(req->rq_at_linked))
897 ptlrpc_at_remove_timed(req);
898 spin_unlock(&svcpt->scp_at_lock);
901 LASSERT(list_empty(&req->rq_timed_list));
903 /* finalize request */
904 if (req->rq_export) {
905 class_export_put(req->rq_export);
906 req->rq_export = NULL;
909 spin_lock(&svcpt->scp_lock);
911 list_add(&req->rq_list, &rqbd->rqbd_reqs);
913 refcount = --(rqbd->rqbd_refcount);
915 /* request buffer is now idle: add to history */
916 list_del(&rqbd->rqbd_list);
918 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
919 svcpt->scp_hist_nrqbds++;
921 /* cull some history?
922 * I expect only about 1 or 2 rqbds need to be recycled here */
923 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
924 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
925 struct ptlrpc_request_buffer_desc,
928 list_del(&rqbd->rqbd_list);
929 svcpt->scp_hist_nrqbds--;
931 /* remove rqbd's reqs from svc's req history while
932 * I've got the service lock */
933 list_for_each(tmp, &rqbd->rqbd_reqs) {
934 req = list_entry(tmp, struct ptlrpc_request,
936 /* Track the highest culled req seq */
937 if (req->rq_history_seq >
938 svcpt->scp_hist_seq_culled) {
939 svcpt->scp_hist_seq_culled =
942 list_del(&req->rq_history_list);
945 spin_unlock(&svcpt->scp_lock);
947 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
948 req = list_entry(rqbd->rqbd_reqs.next,
949 struct ptlrpc_request,
951 list_del(&req->rq_list);
952 ptlrpc_server_free_request(req);
955 spin_lock(&svcpt->scp_lock);
957 * now all reqs including the embedded req has been
958 * disposed, schedule request buffer for re-use
959 * or free it to drain some in excess.
961 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == 0);
962 if (svcpt->scp_nrqbds_posted >=
963 svc->srv_nbuf_per_group ||
964 (svc->srv_nrqbds_max != 0 &&
965 svcpt->scp_nrqbds_total > svc->srv_nrqbds_max) ||
966 test_req_buffer_pressure) {
967 /* like in ptlrpc_free_rqbd() */
968 svcpt->scp_nrqbds_total--;
969 OBD_FREE_LARGE(rqbd->rqbd_buffer,
973 list_add_tail(&rqbd->rqbd_list,
974 &svcpt->scp_rqbd_idle);
978 spin_unlock(&svcpt->scp_lock);
979 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
980 /* If we are low on memory, we are not interested in history */
981 list_del(&req->rq_list);
982 list_del_init(&req->rq_history_list);
984 /* Track the highest culled req seq */
985 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
986 svcpt->scp_hist_seq_culled = req->rq_history_seq;
988 spin_unlock(&svcpt->scp_lock);
990 ptlrpc_server_free_request(req);
992 spin_unlock(&svcpt->scp_lock);
996 /** Change request export and move hp request from old export to new */
997 void ptlrpc_request_change_export(struct ptlrpc_request *req,
998 struct obd_export *export)
1000 if (req->rq_export != NULL) {
1001 LASSERT(!list_empty(&req->rq_exp_list));
1002 /* remove rq_exp_list from last export */
1003 spin_lock(&req->rq_export->exp_rpc_lock);
1004 list_del_init(&req->rq_exp_list);
1005 spin_unlock(&req->rq_export->exp_rpc_lock);
1006 /* export has one reference already, so it`s safe to
1007 * add req to export queue here and get another
1008 * reference for request later */
1009 spin_lock(&export->exp_rpc_lock);
1010 if (req->rq_ops != NULL) /* hp request */
1011 list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
1013 list_add(&req->rq_exp_list, &export->exp_reg_rpcs);
1014 spin_unlock(&export->exp_rpc_lock);
1016 class_export_rpc_dec(req->rq_export);
1017 class_export_put(req->rq_export);
1020 /* request takes one export refcount */
1021 req->rq_export = class_export_get(export);
1022 class_export_rpc_inc(export);
1028 * to finish a request: stop sending more early replies, and release
1031 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
1032 struct ptlrpc_request *req)
1034 ptlrpc_server_hpreq_fini(req);
1036 ptlrpc_server_drop_request(req);
1040 * to finish an active request: stop sending more early replies, and release
1041 * the request. should be called after we finished handling the request.
1043 static void ptlrpc_server_finish_active_request(
1044 struct ptlrpc_service_part *svcpt,
1045 struct ptlrpc_request *req)
1047 spin_lock(&svcpt->scp_req_lock);
1048 ptlrpc_nrs_req_stop_nolock(req);
1049 svcpt->scp_nreqs_active--;
1051 svcpt->scp_nhreqs_active--;
1052 spin_unlock(&svcpt->scp_req_lock);
1054 ptlrpc_nrs_req_finalize(req);
1056 if (req->rq_export != NULL)
1057 class_export_rpc_dec(req->rq_export);
1059 ptlrpc_server_finish_request(svcpt, req);
1063 * This function makes sure dead exports are evicted in a timely manner.
1064 * This function is only called when some export receives a message (i.e.,
1065 * the network is up.)
1067 void ptlrpc_update_export_timer(struct obd_export *exp, time64_t extra_delay)
1069 struct obd_export *oldest_exp;
1070 time64_t oldest_time, new_time;
1076 /* Compensate for slow machines, etc, by faking our request time
1077 into the future. Although this can break the strict time-ordering
1078 of the list, we can be really lazy here - we don't have to evict
1079 at the exact right moment. Eventually, all silent exports
1080 will make it to the top of the list. */
1082 /* Do not pay attention on 1sec or smaller renewals. */
1083 new_time = ktime_get_real_seconds() + extra_delay;
1084 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
1087 exp->exp_last_request_time = new_time;
1089 /* exports may get disconnected from the chain even though the
1090 export has references, so we must keep the spin lock while
1091 manipulating the lists */
1092 spin_lock(&exp->exp_obd->obd_dev_lock);
1094 if (list_empty(&exp->exp_obd_chain_timed)) {
1095 /* this one is not timed */
1096 spin_unlock(&exp->exp_obd->obd_dev_lock);
1100 list_move_tail(&exp->exp_obd_chain_timed,
1101 &exp->exp_obd->obd_exports_timed);
1103 oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
1104 struct obd_export, exp_obd_chain_timed);
1105 oldest_time = oldest_exp->exp_last_request_time;
1106 spin_unlock(&exp->exp_obd->obd_dev_lock);
1108 if (exp->exp_obd->obd_recovering) {
1109 /* be nice to everyone during recovery */
1114 /* Note - racing to start/reset the obd_eviction timer is safe */
1115 if (exp->exp_obd->obd_eviction_timer == 0) {
1116 /* Check if the oldest entry is expired. */
1117 if (ktime_get_real_seconds() >
1118 oldest_time + PING_EVICT_TIMEOUT + extra_delay) {
1119 /* We need a second timer, in case the net was down and
1120 * it just came back. Since the pinger may skip every
1121 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
1122 * we better wait for 3.
1124 exp->exp_obd->obd_eviction_timer =
1125 ktime_get_real_seconds() + 3 * PING_INTERVAL;
1126 CDEBUG(D_HA, "%s: Think about evicting %s from %lld\n",
1127 exp->exp_obd->obd_name,
1128 obd_export_nid2str(oldest_exp), oldest_time);
1131 if (ktime_get_real_seconds() >
1132 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
1133 /* The evictor won't evict anyone who we've heard from
1134 * recently, so we don't have to check before we start
1137 if (!ping_evictor_wake(exp))
1138 exp->exp_obd->obd_eviction_timer = 0;
1146 * Sanity check request \a req.
1147 * Return 0 if all is ok, error code otherwise.
1149 static int ptlrpc_check_req(struct ptlrpc_request *req)
1151 struct obd_device *obd = req->rq_export->exp_obd;
1154 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
1155 req->rq_export->exp_conn_cnt)) {
1156 DEBUG_REQ(D_RPCTRACE, req,
1157 "DROPPING req from old connection %d < %d",
1158 lustre_msg_get_conn_cnt(req->rq_reqmsg),
1159 req->rq_export->exp_conn_cnt);
1162 if (unlikely(obd == NULL || obd->obd_fail)) {
1163 /* Failing over, don't handle any more reqs,
1164 * send error response instead. */
1165 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
1166 req, (obd != NULL) ? obd->obd_name : "unknown");
1168 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
1169 (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
1170 !obd->obd_recovering) {
1171 DEBUG_REQ(D_ERROR, req,
1172 "Invalid replay without recovery");
1173 class_fail_export(req->rq_export);
1175 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0 &&
1176 !obd->obd_recovering) {
1177 DEBUG_REQ(D_ERROR, req, "Invalid req with transno "
1178 "%llu without recovery",
1179 lustre_msg_get_transno(req->rq_reqmsg));
1180 class_fail_export(req->rq_export);
1184 if (unlikely(rc < 0)) {
1185 req->rq_status = rc;
1191 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
1193 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1196 if (array->paa_count == 0) {
1197 del_timer(&svcpt->scp_at_timer);
1201 /* Set timer for closest deadline */
1202 next = array->paa_deadline - ktime_get_real_seconds() -
1205 ptlrpc_at_timer(cfs_timer_cb_arg(svcpt, scp_at_timer));
1207 mod_timer(&svcpt->scp_at_timer,
1208 jiffies + nsecs_to_jiffies(next * NSEC_PER_SEC));
1209 CDEBUG(D_INFO, "armed %s at %+llds\n",
1210 svcpt->scp_service->srv_name, next);
1214 /* Add rpc to early reply check list */
1215 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
1217 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1218 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1219 struct ptlrpc_request *rq = NULL;
1225 if (req->rq_no_reply)
1228 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
1231 spin_lock(&svcpt->scp_at_lock);
1232 LASSERT(list_empty(&req->rq_timed_list));
1234 div_u64_rem(req->rq_deadline, array->paa_size, &index);
1235 if (array->paa_reqs_count[index] > 0) {
1236 /* latest rpcs will have the latest deadlines in the list,
1237 * so search backward. */
1238 list_for_each_entry_reverse(rq,
1239 &array->paa_reqs_array[index],
1241 if (req->rq_deadline >= rq->rq_deadline) {
1242 list_add(&req->rq_timed_list,
1243 &rq->rq_timed_list);
1249 /* Add the request at the head of the list */
1250 if (list_empty(&req->rq_timed_list))
1251 list_add(&req->rq_timed_list,
1252 &array->paa_reqs_array[index]);
1254 spin_lock(&req->rq_lock);
1255 req->rq_at_linked = 1;
1256 spin_unlock(&req->rq_lock);
1257 req->rq_at_index = index;
1258 array->paa_reqs_count[index]++;
1260 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
1261 array->paa_deadline = req->rq_deadline;
1262 ptlrpc_at_set_timer(svcpt);
1264 spin_unlock(&svcpt->scp_at_lock);
1270 ptlrpc_at_remove_timed(struct ptlrpc_request *req)
1272 struct ptlrpc_at_array *array;
1274 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
1276 /* NB: must call with hold svcpt::scp_at_lock */
1277 LASSERT(!list_empty(&req->rq_timed_list));
1278 list_del_init(&req->rq_timed_list);
1280 spin_lock(&req->rq_lock);
1281 req->rq_at_linked = 0;
1282 spin_unlock(&req->rq_lock);
1284 array->paa_reqs_count[req->rq_at_index]--;
1289 * Attempt to extend the request deadline by sending an early reply to the
1292 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1294 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1295 struct ptlrpc_request *reqcopy;
1296 struct lustre_msg *reqmsg;
1297 time64_t olddl = req->rq_deadline - ktime_get_real_seconds();
1303 if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_RECONNECT)) {
1304 /* don't send early reply */
1308 /* deadline is when the client expects us to reply, margin is the
1309 difference between clients' and servers' expectations */
1310 DEBUG_REQ(D_ADAPTTO, req,
1311 "%ssending early reply (deadline %+llds, margin %+llds) for "
1312 "%d+%d", AT_OFF ? "AT off - not " : "",
1313 (s64)olddl, (s64)(olddl - at_get(&svcpt->scp_at_estimate)),
1314 at_get(&svcpt->scp_at_estimate), at_extra);
1320 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+llds), "
1321 "not sending early reply. Consider increasing "
1322 "at_early_margin (%d)?", (s64)olddl, at_early_margin);
1324 /* Return an error so we're not re-added to the timed list. */
1328 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
1329 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
1330 "but no AT support");
1334 if (req->rq_export &&
1335 lustre_msg_get_flags(req->rq_reqmsg) &
1336 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1337 struct obd_device *obd_exp = req->rq_export->exp_obd;
1339 /* During recovery, we don't want to send too many early
1340 * replies, but on the other hand we want to make sure the
1341 * client has enough time to resend if the rpc is lost. So
1342 * during the recovery period send at least 4 early replies,
1343 * spacing them every at_extra if we can. at_estimate should
1344 * always equal this fixed value during recovery.
1346 /* Don't account request processing time into AT history
1347 * during recovery, it is not service time we need but
1348 * includes also waiting time for recovering clients
1350 newdl = min_t(time64_t, at_extra,
1351 obd_exp->obd_recovery_timeout / 4) +
1352 ktime_get_real_seconds();
1354 /* We want to extend the request deadline by at_extra seconds,
1355 * so we set our service estimate to reflect how much time has
1356 * passed since this request arrived plus an additional
1357 * at_extra seconds. The client will calculate the new deadline
1358 * based on this service estimate (plus some additional time to
1359 * account for network latency). See ptlrpc_at_recv_early_reply
1361 at_measured(&svcpt->scp_at_estimate, at_extra +
1362 ktime_get_real_seconds() -
1363 req->rq_arrival_time.tv_sec);
1364 newdl = req->rq_arrival_time.tv_sec +
1365 at_get(&svcpt->scp_at_estimate);
1368 /* Check to see if we've actually increased the deadline -
1369 * we may be past adaptive_max */
1370 if (req->rq_deadline >= newdl) {
1371 DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%lld/%lld), not sending early reply\n",
1372 (s64)olddl, (s64)(newdl - ktime_get_real_seconds()));
1376 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1377 if (reqcopy == NULL)
1379 OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
1381 GOTO(out_free, rc = -ENOMEM);
1384 reqcopy->rq_reply_state = NULL;
1385 reqcopy->rq_rep_swab_mask = 0;
1386 reqcopy->rq_pack_bulk = 0;
1387 reqcopy->rq_pack_udesc = 0;
1388 reqcopy->rq_packed_final = 0;
1389 sptlrpc_svc_ctx_addref(reqcopy);
1390 /* We only need the reqmsg for the magic */
1391 reqcopy->rq_reqmsg = reqmsg;
1392 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1395 * tgt_brw_read() and tgt_brw_write() may have decided not to reply.
1396 * Without this check, we would fail the rq_no_reply assertion in
1397 * ptlrpc_send_reply().
1399 if (reqcopy->rq_no_reply)
1400 GOTO(out, rc = -ETIMEDOUT);
1402 LASSERT(atomic_read(&req->rq_refcount));
1403 /** if it is last refcount then early reply isn't needed */
1404 if (atomic_read(&req->rq_refcount) == 1) {
1405 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1406 "abort sending early reply\n");
1407 GOTO(out, rc = -EINVAL);
1410 /* Connection ref */
1411 reqcopy->rq_export = class_conn2export(
1412 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1413 if (reqcopy->rq_export == NULL)
1414 GOTO(out, rc = -ENODEV);
1417 class_export_rpc_inc(reqcopy->rq_export);
1418 if (reqcopy->rq_export->exp_obd &&
1419 reqcopy->rq_export->exp_obd->obd_fail)
1420 GOTO(out_put, rc = -ENODEV);
1422 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1426 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1429 /* Adjust our own deadline to what we told the client */
1430 req->rq_deadline = newdl;
1431 req->rq_early_count++; /* number sent, server side */
1433 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1436 /* Free the (early) reply state from lustre_pack_reply.
1437 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1438 ptlrpc_req_drop_rs(reqcopy);
1441 class_export_rpc_dec(reqcopy->rq_export);
1442 class_export_put(reqcopy->rq_export);
1444 sptlrpc_svc_ctx_decref(reqcopy);
1445 OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
1447 ptlrpc_request_cache_free(reqcopy);
1451 /* Send early replies to everybody expiring within at_early_margin
1452 asking for at_extra time */
1453 static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1455 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1456 struct ptlrpc_request *rq, *n;
1457 struct list_head work_list;
1460 time64_t now = ktime_get_real_seconds();
1462 int first, counter = 0;
1465 spin_lock(&svcpt->scp_at_lock);
1466 if (svcpt->scp_at_check == 0) {
1467 spin_unlock(&svcpt->scp_at_lock);
1470 delay = ktime_ms_delta(ktime_get(), svcpt->scp_at_checktime);
1471 svcpt->scp_at_check = 0;
1473 if (array->paa_count == 0) {
1474 spin_unlock(&svcpt->scp_at_lock);
1478 /* The timer went off, but maybe the nearest rpc already completed. */
1479 first = array->paa_deadline - now;
1480 if (first > at_early_margin) {
1481 /* We've still got plenty of time. Reset the timer. */
1482 ptlrpc_at_set_timer(svcpt);
1483 spin_unlock(&svcpt->scp_at_lock);
1487 /* We're close to a timeout, and we don't know how much longer the
1488 server will take. Send early replies to everyone expiring soon. */
1489 INIT_LIST_HEAD(&work_list);
1491 div_u64_rem(array->paa_deadline, array->paa_size, &index);
1492 count = array->paa_count;
1494 count -= array->paa_reqs_count[index];
1495 list_for_each_entry_safe(rq, n,
1496 &array->paa_reqs_array[index],
1498 if (rq->rq_deadline > now + at_early_margin) {
1499 /* update the earliest deadline */
1500 if (deadline == -1 ||
1501 rq->rq_deadline < deadline)
1502 deadline = rq->rq_deadline;
1507 * ptlrpc_server_drop_request() may drop
1508 * refcount to 0 already. Let's check this and
1509 * don't add entry to work_list
1511 if (likely(atomic_inc_not_zero(&rq->rq_refcount))) {
1512 ptlrpc_at_remove_timed(rq);
1513 list_add(&rq->rq_timed_list, &work_list);
1515 ptlrpc_at_remove_timed(rq);
1521 if (++index >= array->paa_size)
1524 array->paa_deadline = deadline;
1525 /* we have a new earliest deadline, restart the timer */
1526 ptlrpc_at_set_timer(svcpt);
1528 spin_unlock(&svcpt->scp_at_lock);
1530 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1531 "replies\n", first, at_extra, counter);
1533 /* We're already past request deadlines before we even get a
1534 chance to send early replies */
1535 LCONSOLE_WARN("%s: This server is not able to keep up with "
1536 "request traffic (cpu-bound).\n",
1537 svcpt->scp_service->srv_name);
1538 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%lld\n",
1539 counter, svcpt->scp_nreqs_incoming,
1540 svcpt->scp_nreqs_active,
1541 at_get(&svcpt->scp_at_estimate), delay);
1544 /* we took additional refcount so entries can't be deleted from list, no
1545 * locking is needed */
1546 while (!list_empty(&work_list)) {
1547 rq = list_entry(work_list.next, struct ptlrpc_request,
1549 list_del_init(&rq->rq_timed_list);
1551 if (ptlrpc_at_send_early_reply(rq) == 0)
1552 ptlrpc_at_add_timed(rq);
1554 ptlrpc_server_drop_request(rq);
1557 RETURN(1); /* return "did_something" for liblustre */
1560 /* Check if we are already handling earlier incarnation of this request.
1561 * Called under &req->rq_export->exp_rpc_lock locked */
1562 static struct ptlrpc_request*
1563 ptlrpc_server_check_resend_in_progress(struct ptlrpc_request *req)
1565 struct ptlrpc_request *tmp = NULL;
1567 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ||
1568 (atomic_read(&req->rq_export->exp_rpc_count) == 0))
1571 /* bulk request are aborted upon reconnect, don't try to
1573 if (req->rq_bulk_write || req->rq_bulk_read)
1576 /* This list should not be longer than max_requests in
1577 * flights on the client, so it is not all that long.
1578 * Also we only hit this codepath in case of a resent
1579 * request which makes it even more rarely hit */
1580 list_for_each_entry(tmp, &req->rq_export->exp_reg_rpcs,
1582 /* Found duplicate one */
1583 if (tmp->rq_xid == req->rq_xid)
1586 list_for_each_entry(tmp, &req->rq_export->exp_hp_rpcs,
1588 /* Found duplicate one */
1589 if (tmp->rq_xid == req->rq_xid)
1595 DEBUG_REQ(D_HA, req, "Found duplicate req in processing");
1596 DEBUG_REQ(D_HA, tmp, "Request being processed");
1601 * Check if a request should be assigned with a high priority.
1603 * \retval < 0: error occurred
1604 * 0: normal RPC request
1605 * +1: high priority request
1607 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1608 struct ptlrpc_request *req)
1613 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL) {
1614 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1621 if (req->rq_export != NULL && req->rq_ops != NULL) {
1622 /* Perform request specific check. We should do this
1623 * check before the request is added into exp_hp_rpcs
1624 * list otherwise it may hit swab race at LU-1044. */
1625 if (req->rq_ops->hpreq_check != NULL) {
1626 rc = req->rq_ops->hpreq_check(req);
1627 if (rc == -ESTALE) {
1628 req->rq_status = rc;
1631 /** can only return error,
1632 * 0 for normal request,
1633 * or 1 for high priority request */
1641 /** Remove the request from the export list. */
1642 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1645 if (req->rq_export) {
1646 /* refresh lock timeout again so that client has more
1647 * room to send lock cancel RPC. */
1648 if (req->rq_ops && req->rq_ops->hpreq_fini)
1649 req->rq_ops->hpreq_fini(req);
1651 spin_lock(&req->rq_export->exp_rpc_lock);
1652 list_del_init(&req->rq_exp_list);
1653 spin_unlock(&req->rq_export->exp_rpc_lock);
1658 static int ptlrpc_hpreq_check(struct ptlrpc_request *req)
1663 static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
1664 .hpreq_check = ptlrpc_hpreq_check,
1667 /* Hi-Priority RPC check by RPC operation code. */
1668 int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
1670 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1672 /* Check for export to let only reconnects for not yet evicted
1673 * export to become a HP rpc. */
1674 if ((req->rq_export != NULL) &&
1675 (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
1676 req->rq_ops = &ptlrpc_hpreq_common;
1680 EXPORT_SYMBOL(ptlrpc_hpreq_handler);
1682 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1683 struct ptlrpc_request *req)
1687 struct ptlrpc_request *orig;
1690 rc = ptlrpc_server_hpreq_init(svcpt, req);
1695 ptlrpc_nrs_req_initialize(svcpt, req, hp);
1697 if (req->rq_export != NULL) {
1698 struct obd_export *exp = req->rq_export;
1700 /* do search for duplicated xid and the adding to the list
1702 spin_lock_bh(&exp->exp_rpc_lock);
1703 orig = ptlrpc_server_check_resend_in_progress(req);
1704 if (orig && likely(atomic_inc_not_zero(&orig->rq_refcount))) {
1707 spin_unlock_bh(&exp->exp_rpc_lock);
1710 * When the client resend request and the server has
1711 * the previous copy of it, we need to update deadlines,
1712 * to be sure that the client and the server have equal
1713 * request deadlines.
1716 spin_lock(&orig->rq_rqbd->rqbd_svcpt->scp_at_lock);
1717 linked = orig->rq_at_linked;
1719 ptlrpc_at_remove_timed(orig);
1720 spin_unlock(&orig->rq_rqbd->rqbd_svcpt->scp_at_lock);
1721 orig->rq_deadline = req->rq_deadline;
1723 ptlrpc_at_add_timed(orig);
1724 ptlrpc_server_drop_request(orig);
1725 ptlrpc_nrs_req_finalize(req);
1729 if (hp || req->rq_ops != NULL)
1730 list_add(&req->rq_exp_list, &exp->exp_hp_rpcs);
1732 list_add(&req->rq_exp_list, &exp->exp_reg_rpcs);
1733 spin_unlock_bh(&exp->exp_rpc_lock);
1736 /* the current thread is not the processing thread for this request
1737 * since that, but request is in exp_hp_list and can be find there.
1738 * Remove all relations between request and old thread. */
1739 req->rq_svc_thread->t_env->le_ses = NULL;
1740 req->rq_svc_thread = NULL;
1741 req->rq_session.lc_thread = NULL;
1743 ptlrpc_nrs_req_add(svcpt, req, hp);
1749 * Allow to handle high priority request
1750 * User can call it w/o any lock but need to hold
1751 * ptlrpc_service_part::scp_req_lock to get reliable result
1753 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1756 int running = svcpt->scp_nthrs_running;
1758 if (!nrs_svcpt_has_hp(svcpt))
1764 if (ptlrpc_nrs_req_throttling_nolock(svcpt, true))
1767 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1768 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1769 /* leave just 1 thread for normal RPCs */
1770 running = PTLRPC_NTHRS_INIT;
1771 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1775 if (svcpt->scp_nreqs_active >= running - 1)
1778 if (svcpt->scp_nhreqs_active == 0)
1781 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1782 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1785 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1788 return ptlrpc_server_allow_high(svcpt, force) &&
1789 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1793 * Only allow normal priority requests on a service that has a high-priority
1794 * queue if forced (i.e. cleanup), if there are other high priority requests
1795 * already being processed (i.e. those threads can service more high-priority
1796 * requests), or if there are enough idle threads that a later thread can do
1797 * a high priority request.
1798 * User can call it w/o any lock but need to hold
1799 * ptlrpc_service_part::scp_req_lock to get reliable result
1801 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1804 int running = svcpt->scp_nthrs_running;
1805 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1806 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1807 /* leave just 1 thread for normal RPCs */
1808 running = PTLRPC_NTHRS_INIT;
1809 if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL)
1816 if (ptlrpc_nrs_req_throttling_nolock(svcpt, false))
1819 if (svcpt->scp_nreqs_active < running - 2)
1822 if (svcpt->scp_nreqs_active >= running - 1)
1825 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1828 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1831 return ptlrpc_server_allow_normal(svcpt, force) &&
1832 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1836 * Returns true if there are requests available in incoming
1837 * request queue for processing and it is allowed to fetch them.
1838 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1839 * to get reliable result
1840 * \see ptlrpc_server_allow_normal
1841 * \see ptlrpc_server_allow high
1844 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1846 return ptlrpc_server_high_pending(svcpt, force) ||
1847 ptlrpc_server_normal_pending(svcpt, force);
1851 * Fetch a request for processing from queue of unprocessed requests.
1852 * Favors high-priority requests.
1853 * Returns a pointer to fetched request.
1855 static struct ptlrpc_request *
1856 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1858 struct ptlrpc_request *req = NULL;
1861 spin_lock(&svcpt->scp_req_lock);
1863 if (ptlrpc_server_high_pending(svcpt, force)) {
1864 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1866 svcpt->scp_hreq_count++;
1871 if (ptlrpc_server_normal_pending(svcpt, force)) {
1872 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1874 svcpt->scp_hreq_count = 0;
1879 spin_unlock(&svcpt->scp_req_lock);
1883 svcpt->scp_nreqs_active++;
1885 svcpt->scp_nhreqs_active++;
1887 spin_unlock(&svcpt->scp_req_lock);
1889 if (likely(req->rq_export))
1890 class_export_rpc_inc(req->rq_export);
1896 * Handle freshly incoming reqs, add to timed early reply list,
1897 * pass on to regular request queue.
1898 * All incoming requests pass through here before getting into
1899 * ptlrpc_server_handle_req later on.
1902 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1903 struct ptlrpc_thread *thread)
1905 struct ptlrpc_service *svc = svcpt->scp_service;
1906 struct ptlrpc_request *req;
1911 spin_lock(&svcpt->scp_lock);
1912 if (list_empty(&svcpt->scp_req_incoming)) {
1913 spin_unlock(&svcpt->scp_lock);
1917 req = list_entry(svcpt->scp_req_incoming.next,
1918 struct ptlrpc_request, rq_list);
1919 list_del_init(&req->rq_list);
1920 svcpt->scp_nreqs_incoming--;
1921 /* Consider this still a "queued" request as far as stats are
1923 spin_unlock(&svcpt->scp_lock);
1925 /* go through security check/transform */
1926 rc = sptlrpc_svc_unwrap_request(req);
1930 case SECSVC_COMPLETE:
1931 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1940 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1941 * redo it wouldn't be harmful.
1943 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1944 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1946 CERROR("error unpacking request: ptl %d from %s "
1947 "x%llu\n", svc->srv_req_portal,
1948 libcfs_id2str(req->rq_peer), req->rq_xid);
1953 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1955 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1956 "%llu\n", svc->srv_req_portal,
1957 libcfs_id2str(req->rq_peer), req->rq_xid);
1961 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1962 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1963 CERROR("drop incoming rpc opc %u, x%llu\n",
1964 cfs_fail_val, req->rq_xid);
1969 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1970 CERROR("wrong packet type received (type=%u) from %s\n",
1971 lustre_msg_get_type(req->rq_reqmsg),
1972 libcfs_id2str(req->rq_peer));
1976 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1980 req->rq_bulk_write = 1;
1984 case MGS_CONFIG_READ:
1985 req->rq_bulk_read = 1;
1989 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
1991 req->rq_export = class_conn2export(
1992 lustre_msg_get_handle(req->rq_reqmsg));
1993 if (req->rq_export) {
1994 rc = ptlrpc_check_req(req);
1996 rc = sptlrpc_target_export_check(req->rq_export, req);
1998 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1999 "illegal security flavor,");
2004 ptlrpc_update_export_timer(req->rq_export, 0);
2007 /* req_in handling should/must be fast */
2008 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
2009 DEBUG_REQ(D_WARNING, req, "Slow req_in handling %llds",
2010 (s64)(ktime_get_real_seconds() -
2011 req->rq_arrival_time.tv_sec));
2013 /* Set rpc server deadline and add it to the timed list */
2014 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
2015 MSGHDR_AT_SUPPORT) ?
2016 /* The max time the client expects us to take */
2017 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
2019 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
2020 if (unlikely(deadline == 0)) {
2021 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
2025 /* Skip early reply */
2026 if (OBD_FAIL_PRECHECK(OBD_FAIL_MDS_RESEND))
2027 req->rq_deadline += obd_timeout;
2029 req->rq_svc_thread = thread;
2030 if (thread != NULL) {
2031 /* initialize request session, it is needed for request
2032 * processing by target */
2033 rc = lu_context_init(&req->rq_session, LCT_SERVER_SESSION |
2036 CERROR("%s: failure to initialize session: rc = %d\n",
2037 thread->t_name, rc);
2040 req->rq_session.lc_thread = thread;
2041 lu_context_enter(&req->rq_session);
2042 thread->t_env->le_ses = &req->rq_session;
2045 ptlrpc_at_add_timed(req);
2047 /* Move it over to the request processing queue */
2048 rc = ptlrpc_server_request_add(svcpt, req);
2052 wake_up(&svcpt->scp_waitq);
2056 ptlrpc_server_finish_request(svcpt, req);
2062 * Main incoming request handling logic.
2063 * Calls handler function from service to do actual processing.
2066 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
2067 struct ptlrpc_thread *thread)
2069 struct ptlrpc_service *svc = svcpt->scp_service;
2070 struct ptlrpc_request *request;
2080 request = ptlrpc_server_request_get(svcpt, false);
2081 if (request == NULL)
2084 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
2085 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
2086 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
2087 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
2089 if (unlikely(fail_opc)) {
2090 if (request->rq_export && request->rq_ops)
2091 OBD_FAIL_TIMEOUT(fail_opc, 4);
2094 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
2096 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
2097 libcfs_debug_dumplog();
2099 work_start = ktime_get_real();
2100 arrived = timespec64_to_ktime(request->rq_arrival_time);
2101 timediff_usecs = ktime_us_delta(work_start, arrived);
2102 if (likely(svc->srv_stats != NULL)) {
2103 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
2105 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
2106 svcpt->scp_nreqs_incoming);
2107 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
2108 svcpt->scp_nreqs_active);
2109 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
2110 at_get(&svcpt->scp_at_estimate));
2113 if (likely(request->rq_export)) {
2114 if (unlikely(ptlrpc_check_req(request)))
2116 ptlrpc_update_export_timer(request->rq_export,
2117 div_u64(timediff_usecs,
2121 /* Discard requests queued for longer than the deadline.
2122 The deadline is increased if we send an early reply. */
2123 if (ktime_get_real_seconds() > request->rq_deadline) {
2124 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline %lld:%llds ago\n",
2125 libcfs_id2str(request->rq_peer),
2126 request->rq_deadline -
2127 request->rq_arrival_time.tv_sec,
2128 ktime_get_real_seconds() - request->rq_deadline);
2132 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
2133 "%s:%s+%d:%d:x%llu:%s:%d\n", current_comm(),
2134 (request->rq_export ?
2135 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2136 (request->rq_export ?
2137 atomic_read(&request->rq_export->exp_refcount) : -99),
2138 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
2139 libcfs_id2str(request->rq_peer),
2140 lustre_msg_get_opc(request->rq_reqmsg));
2142 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
2143 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
2145 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
2147 /* re-assign request and sesson thread to the current one */
2148 request->rq_svc_thread = thread;
2149 if (thread != NULL) {
2150 LASSERT(request->rq_session.lc_thread == NULL);
2151 request->rq_session.lc_thread = thread;
2152 thread->t_env->le_ses = &request->rq_session;
2154 svc->srv_ops.so_req_handler(request);
2156 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
2159 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
2160 DEBUG_REQ(D_WARNING, request,
2161 "Request took longer than estimated (%lld:%llds); "
2162 "client may timeout.",
2163 request->rq_deadline -
2164 request->rq_arrival_time.tv_sec,
2165 ktime_get_real_seconds() - request->rq_deadline);
2168 work_end = ktime_get_real();
2169 timediff_usecs = ktime_us_delta(work_end, work_start);
2170 arrived_usecs = ktime_us_delta(work_end, arrived);
2171 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
2172 "%s:%s+%d:%d:x%llu:%s:%d Request processed in %lldus "
2173 "(%lldus total) trans %llu rc %d/%d\n",
2175 (request->rq_export ?
2176 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
2177 (request->rq_export ?
2178 atomic_read(&request->rq_export->exp_refcount) : -99),
2179 lustre_msg_get_status(request->rq_reqmsg),
2181 libcfs_id2str(request->rq_peer),
2182 lustre_msg_get_opc(request->rq_reqmsg),
2185 (request->rq_repmsg ?
2186 lustre_msg_get_transno(request->rq_repmsg) :
2187 request->rq_transno),
2189 (request->rq_repmsg ?
2190 lustre_msg_get_status(request->rq_repmsg) : -999));
2191 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
2192 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
2193 int opc = opcode_offset(op);
2194 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
2195 LASSERT(opc < LUSTRE_MAX_OPCODES);
2196 lprocfs_counter_add(svc->srv_stats,
2197 opc + EXTRA_MAX_OPCODES,
2201 if (unlikely(request->rq_early_count)) {
2202 DEBUG_REQ(D_ADAPTTO, request,
2203 "sent %d early replies before finishing in %llds",
2204 request->rq_early_count,
2205 div_u64(arrived_usecs, USEC_PER_SEC));
2208 ptlrpc_server_finish_active_request(svcpt, request);
2214 * An internal function to process a single reply state object.
2217 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
2219 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
2220 struct ptlrpc_service *svc = svcpt->scp_service;
2221 struct obd_export *exp;
2226 exp = rs->rs_export;
2228 LASSERT(rs->rs_difficult);
2229 LASSERT(rs->rs_scheduled);
2230 LASSERT(list_empty(&rs->rs_list));
2232 /* The disk commit callback holds exp_uncommitted_replies_lock while it
2233 * iterates over newly committed replies, removing them from
2234 * exp_uncommitted_replies. It then drops this lock and schedules the
2235 * replies it found for handling here.
2237 * We can avoid contention for exp_uncommitted_replies_lock between the
2238 * HRT threads and further commit callbacks by checking rs_committed
2239 * which is set in the commit callback while it holds both
2240 * rs_lock and exp_uncommitted_reples.
2242 * If we see rs_committed clear, the commit callback _may_ not have
2243 * handled this reply yet and we race with it to grab
2244 * exp_uncommitted_replies_lock before removing the reply from
2245 * exp_uncommitted_replies. Note that if we lose the race and the
2246 * reply has already been removed, list_del_init() is a noop.
2248 * If we see rs_committed set, we know the commit callback is handling,
2249 * or has handled this reply since store reordering might allow us to
2250 * see rs_committed set out of sequence. But since this is done
2251 * holding rs_lock, we can be sure it has all completed once we hold
2252 * rs_lock, which we do right next.
2254 if (!rs->rs_committed) {
2255 /* if rs was commited, no need to convert locks, don't check
2256 * rs_committed here because rs may never be added into
2257 * exp_uncommitted_replies and this flag never be set, see
2258 * target_send_reply() */
2259 if (rs->rs_convert_lock &&
2260 rs->rs_transno > exp->exp_last_committed) {
2261 struct ldlm_lock *lock;
2262 struct ldlm_lock *ack_locks[RS_MAX_LOCKS] = { NULL };
2264 spin_lock(&rs->rs_lock);
2265 if (rs->rs_convert_lock &&
2266 rs->rs_transno > exp->exp_last_committed) {
2267 nlocks = rs->rs_nlocks;
2268 while (nlocks-- > 0) {
2270 * NB don't assume rs is always handled
2271 * by the same service thread (see
2272 * ptlrpc_hr_select, so REP-ACK hr may
2273 * race with trans commit, while the
2274 * latter will release locks, get locks
2275 * here early to convert to COS mode
2278 lock = ldlm_handle2lock(
2279 &rs->rs_locks[nlocks]);
2281 ack_locks[nlocks] = lock;
2282 rs->rs_modes[nlocks] = LCK_COS;
2284 nlocks = rs->rs_nlocks;
2285 rs->rs_convert_lock = 0;
2286 /* clear rs_scheduled so that commit callback
2287 * can schedule again */
2288 rs->rs_scheduled = 0;
2289 spin_unlock(&rs->rs_lock);
2291 while (nlocks-- > 0) {
2292 lock = ack_locks[nlocks];
2293 ldlm_lock_mode_downgrade(lock, LCK_COS);
2294 LDLM_LOCK_PUT(lock);
2298 spin_unlock(&rs->rs_lock);
2301 spin_lock(&exp->exp_uncommitted_replies_lock);
2302 list_del_init(&rs->rs_obd_list);
2303 spin_unlock(&exp->exp_uncommitted_replies_lock);
2306 spin_lock(&exp->exp_lock);
2307 /* Noop if removed already */
2308 list_del_init(&rs->rs_exp_list);
2309 spin_unlock(&exp->exp_lock);
2311 spin_lock(&rs->rs_lock);
2313 been_handled = rs->rs_handled;
2316 nlocks = rs->rs_nlocks; /* atomic "steal", but */
2317 rs->rs_nlocks = 0; /* locks still on rs_locks! */
2319 if (nlocks == 0 && !been_handled) {
2320 /* If we see this, we should already have seen the warning
2321 * in mds_steal_ack_locks() */
2322 CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld"
2325 rs->rs_xid, rs->rs_transno, rs->rs_opc,
2326 libcfs_nid2str(exp->exp_connection->c_peer.nid));
2329 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
2330 spin_unlock(&rs->rs_lock);
2332 if (!been_handled && rs->rs_on_net) {
2333 LNetMDUnlink(rs->rs_md_h);
2334 /* Ignore return code; we're racing with completion */
2337 while (nlocks-- > 0)
2338 ldlm_lock_decref(&rs->rs_locks[nlocks],
2339 rs->rs_modes[nlocks]);
2341 spin_lock(&rs->rs_lock);
2344 rs->rs_scheduled = 0;
2345 rs->rs_convert_lock = 0;
2347 if (!rs->rs_on_net) {
2349 spin_unlock(&rs->rs_lock);
2351 class_export_put (exp);
2352 rs->rs_export = NULL;
2353 ptlrpc_rs_decref(rs);
2354 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
2355 svc->srv_is_stopping)
2356 wake_up_all(&svcpt->scp_waitq);
2360 /* still on the net; callback will schedule */
2361 spin_unlock(&rs->rs_lock);
2367 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
2369 int avail = svcpt->scp_nrqbds_posted;
2370 int low_water = test_req_buffer_pressure ? 0 :
2371 svcpt->scp_service->srv_nbuf_per_group / 2;
2373 /* NB I'm not locking; just looking. */
2375 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
2376 * allowed the request history to grow out of control. We could put a
2377 * sanity check on that here and cull some history if we need the
2380 if (avail <= low_water)
2381 ptlrpc_grow_req_bufs(svcpt, 1);
2383 if (svcpt->scp_service->srv_stats) {
2384 lprocfs_counter_add(svcpt->scp_service->srv_stats,
2385 PTLRPC_REQBUF_AVAIL_CNTR, avail);
2390 ptlrpc_retry_rqbds(void *arg)
2392 struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
2394 svcpt->scp_rqbd_timeout = 0;
2399 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
2401 return svcpt->scp_nreqs_active <
2402 svcpt->scp_nthrs_running - 1 -
2403 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
2407 * allowed to create more threads
2408 * user can call it w/o any lock but need to hold
2409 * ptlrpc_service_part::scp_lock to get reliable result
2412 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
2414 return svcpt->scp_nthrs_running +
2415 svcpt->scp_nthrs_starting <
2416 svcpt->scp_service->srv_nthrs_cpt_limit;
2420 * too many requests and allowed to create more threads
2423 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
2425 return !ptlrpc_threads_enough(svcpt) &&
2426 ptlrpc_threads_increasable(svcpt);
2430 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2432 return thread_is_stopping(thread) ||
2433 thread->t_svcpt->scp_service->srv_is_stopping;
2437 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
2439 return !list_empty(&svcpt->scp_rqbd_idle) &&
2440 svcpt->scp_rqbd_timeout == 0;
2444 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
2446 return svcpt->scp_at_check;
2450 * requests wait on preprocessing
2451 * user can call it w/o any lock but need to hold
2452 * ptlrpc_service_part::scp_lock to get reliable result
2455 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
2457 return !list_empty(&svcpt->scp_req_incoming);
2460 static __attribute__((__noinline__)) int
2461 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
2462 struct ptlrpc_thread *thread)
2464 /* Don't exit while there are replies to be handled */
2465 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
2466 ptlrpc_retry_rqbds, svcpt);
2468 lc_watchdog_disable(thread->t_watchdog);
2472 l_wait_event_exclusive_head(svcpt->scp_waitq,
2473 ptlrpc_thread_stopping(thread) ||
2474 ptlrpc_server_request_incoming(svcpt) ||
2475 ptlrpc_server_request_pending(svcpt, false) ||
2476 ptlrpc_rqbd_pending(svcpt) ||
2477 ptlrpc_at_check(svcpt), &lwi);
2479 if (ptlrpc_thread_stopping(thread))
2482 lc_watchdog_touch(thread->t_watchdog,
2483 ptlrpc_server_get_timeout(svcpt));
2488 * Main thread body for service threads.
2489 * Waits in a loop waiting for new requests to process to appear.
2490 * Every time an incoming requests is added to its queue, a waitq
2491 * is woken up and one of the threads will handle it.
2493 static int ptlrpc_main(void *arg)
2495 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
2496 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2497 struct ptlrpc_service *svc = svcpt->scp_service;
2498 struct ptlrpc_reply_state *rs;
2499 struct group_info *ginfo = NULL;
2501 int counter = 0, rc = 0;
2504 thread->t_pid = current_pid();
2505 unshare_fs_struct();
2507 if (svc->srv_cpt_bind) {
2508 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2510 CWARN("%s: failed to bind %s on CPT %d\n",
2511 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2515 ginfo = groups_alloc(0);
2521 set_current_groups(ginfo);
2522 put_group_info(ginfo);
2524 if (svc->srv_ops.so_thr_init != NULL) {
2525 rc = svc->srv_ops.so_thr_init(thread);
2536 rc = lu_context_init(&env->le_ctx,
2537 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2541 thread->t_env = env;
2542 env->le_ctx.lc_thread = thread;
2543 env->le_ctx.lc_cookie = 0x6;
2545 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2546 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2550 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2551 svc->srv_name, svcpt->scp_cpt, rc);
2555 /* Alloc reply state structure for this one */
2556 OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
2562 spin_lock(&svcpt->scp_lock);
2564 LASSERT(thread_is_starting(thread));
2565 thread_clear_flags(thread, SVC_STARTING);
2567 LASSERT(svcpt->scp_nthrs_starting == 1);
2568 svcpt->scp_nthrs_starting--;
2570 /* SVC_STOPPING may already be set here if someone else is trying
2571 * to stop the service while this new thread has been dynamically
2572 * forked. We still set SVC_RUNNING to let our creator know that
2573 * we are now running, however we will exit as soon as possible */
2574 thread_add_flags(thread, SVC_RUNNING);
2575 svcpt->scp_nthrs_running++;
2576 spin_unlock(&svcpt->scp_lock);
2578 /* wake up our creator in case he's still waiting. */
2579 wake_up(&thread->t_ctl_waitq);
2581 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2584 spin_lock(&svcpt->scp_rep_lock);
2585 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2586 wake_up(&svcpt->scp_rep_waitq);
2587 spin_unlock(&svcpt->scp_rep_lock);
2589 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2590 svcpt->scp_nthrs_running);
2592 /* XXX maintain a list of all managed devices: insert here */
2593 while (!ptlrpc_thread_stopping(thread)) {
2594 if (ptlrpc_wait_event(svcpt, thread))
2597 ptlrpc_check_rqbd_pool(svcpt);
2599 if (ptlrpc_threads_need_create(svcpt)) {
2600 /* Ignore return code - we tried... */
2601 ptlrpc_start_thread(svcpt, 0);
2604 /* reset le_ses to initial state */
2606 /* Process all incoming reqs before handling any */
2607 if (ptlrpc_server_request_incoming(svcpt)) {
2608 lu_context_enter(&env->le_ctx);
2609 ptlrpc_server_handle_req_in(svcpt, thread);
2610 lu_context_exit(&env->le_ctx);
2612 /* but limit ourselves in case of flood */
2613 if (counter++ < 100)
2618 if (ptlrpc_at_check(svcpt))
2619 ptlrpc_at_check_timed(svcpt);
2621 if (ptlrpc_server_request_pending(svcpt, false)) {
2622 lu_context_enter(&env->le_ctx);
2623 ptlrpc_server_handle_request(svcpt, thread);
2624 lu_context_exit(&env->le_ctx);
2627 if (ptlrpc_rqbd_pending(svcpt) &&
2628 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2629 /* I just failed to repost request buffers.
2630 * Wait for a timeout (unless something else
2631 * happens) before I try again */
2632 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2633 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2634 svcpt->scp_nrqbds_posted);
2638 lc_watchdog_delete(thread->t_watchdog);
2639 thread->t_watchdog = NULL;
2643 * deconstruct service specific state created by ptlrpc_start_thread()
2645 if (svc->srv_ops.so_thr_done != NULL)
2646 svc->srv_ops.so_thr_done(thread);
2649 lu_context_fini(&env->le_ctx);
2653 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2654 thread, thread->t_pid, thread->t_id, rc);
2656 spin_lock(&svcpt->scp_lock);
2657 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2658 svcpt->scp_nthrs_starting--;
2660 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2661 /* must know immediately */
2662 svcpt->scp_nthrs_running--;
2666 thread_add_flags(thread, SVC_STOPPED);
2668 wake_up(&thread->t_ctl_waitq);
2669 spin_unlock(&svcpt->scp_lock);
2674 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2675 struct list_head *replies)
2679 spin_lock(&hrt->hrt_lock);
2681 list_splice_init(&hrt->hrt_queue, replies);
2682 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2684 spin_unlock(&hrt->hrt_lock);
2689 * Main body of "handle reply" function.
2690 * It processes acked reply states
2692 static int ptlrpc_hr_main(void *arg)
2694 struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
2695 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2696 struct list_head replies;
2699 INIT_LIST_HEAD(&replies);
2700 unshare_fs_struct();
2702 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2704 char threadname[20];
2706 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2707 hrp->hrp_cpt, hrt->hrt_id);
2708 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2709 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2712 atomic_inc(&hrp->hrp_nstarted);
2713 wake_up(&ptlrpc_hr.hr_waitq);
2715 while (!ptlrpc_hr.hr_stopping) {
2716 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2718 while (!list_empty(&replies)) {
2719 struct ptlrpc_reply_state *rs;
2721 rs = list_entry(replies.prev,
2722 struct ptlrpc_reply_state,
2724 list_del_init(&rs->rs_list);
2725 ptlrpc_handle_rs(rs);
2729 atomic_inc(&hrp->hrp_nstopped);
2730 wake_up(&ptlrpc_hr.hr_waitq);
2735 static void ptlrpc_stop_hr_threads(void)
2737 struct ptlrpc_hr_partition *hrp;
2741 ptlrpc_hr.hr_stopping = 1;
2743 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2744 if (hrp->hrp_thrs == NULL)
2745 continue; /* uninitialized */
2746 for (j = 0; j < hrp->hrp_nthrs; j++)
2747 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2750 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2751 if (hrp->hrp_thrs == NULL)
2752 continue; /* uninitialized */
2753 wait_event(ptlrpc_hr.hr_waitq,
2754 atomic_read(&hrp->hrp_nstopped) ==
2755 atomic_read(&hrp->hrp_nstarted));
2759 static int ptlrpc_start_hr_threads(void)
2761 struct ptlrpc_hr_partition *hrp;
2766 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2769 for (j = 0; j < hrp->hrp_nthrs; j++) {
2770 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2771 struct task_struct *task;
2773 task = kthread_run(ptlrpc_hr_main,
2775 "ptlrpc_hr%02d_%03d",
2784 wait_event(ptlrpc_hr.hr_waitq,
2785 atomic_read(&hrp->hrp_nstarted) == j);
2788 CERROR("cannot start reply handler thread %d:%d: "
2789 "rc = %d\n", i, j, rc);
2790 ptlrpc_stop_hr_threads();
2798 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2800 struct l_wait_info lwi = { 0 };
2801 struct ptlrpc_thread *thread;
2802 struct list_head zombie;
2806 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2807 svcpt->scp_service->srv_name);
2809 INIT_LIST_HEAD(&zombie);
2810 spin_lock(&svcpt->scp_lock);
2811 /* let the thread know that we would like it to stop asap */
2812 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2813 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2814 svcpt->scp_service->srv_thread_name, thread->t_id);
2815 thread_add_flags(thread, SVC_STOPPING);
2818 wake_up_all(&svcpt->scp_waitq);
2820 while (!list_empty(&svcpt->scp_threads)) {
2821 thread = list_entry(svcpt->scp_threads.next,
2822 struct ptlrpc_thread, t_link);
2823 if (thread_is_stopped(thread)) {
2824 list_del(&thread->t_link);
2825 list_add(&thread->t_link, &zombie);
2828 spin_unlock(&svcpt->scp_lock);
2830 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2831 svcpt->scp_service->srv_thread_name, thread->t_id);
2832 l_wait_event(thread->t_ctl_waitq,
2833 thread_is_stopped(thread), &lwi);
2835 spin_lock(&svcpt->scp_lock);
2838 spin_unlock(&svcpt->scp_lock);
2840 while (!list_empty(&zombie)) {
2841 thread = list_entry(zombie.next,
2842 struct ptlrpc_thread, t_link);
2843 list_del(&thread->t_link);
2844 OBD_FREE_PTR(thread);
2850 * Stops all threads of a particular service \a svc
2852 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2854 struct ptlrpc_service_part *svcpt;
2858 ptlrpc_service_for_each_part(svcpt, i, svc) {
2859 if (svcpt->scp_service != NULL)
2860 ptlrpc_svcpt_stop_threads(svcpt);
2866 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2873 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2874 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2876 for (i = 0; i < svc->srv_ncpts; i++) {
2877 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2878 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2884 /* We have enough threads, don't start more. b=15759 */
2891 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2892 svc->srv_thread_name, i, j, rc);
2893 ptlrpc_stop_all_threads(svc);
2897 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2899 struct l_wait_info lwi = { 0 };
2900 struct ptlrpc_thread *thread;
2901 struct ptlrpc_service *svc;
2902 struct task_struct *task;
2906 LASSERT(svcpt != NULL);
2908 svc = svcpt->scp_service;
2910 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2911 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2912 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2915 if (unlikely(svc->srv_is_stopping))
2918 if (!ptlrpc_threads_increasable(svcpt) ||
2919 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2920 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2923 OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
2926 init_waitqueue_head(&thread->t_ctl_waitq);
2928 spin_lock(&svcpt->scp_lock);
2929 if (!ptlrpc_threads_increasable(svcpt)) {
2930 spin_unlock(&svcpt->scp_lock);
2931 OBD_FREE_PTR(thread);
2935 if (svcpt->scp_nthrs_starting != 0) {
2936 /* serialize starting because some modules (obdfilter)
2937 * might require unique and contiguous t_id */
2938 LASSERT(svcpt->scp_nthrs_starting == 1);
2939 spin_unlock(&svcpt->scp_lock);
2940 OBD_FREE_PTR(thread);
2942 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2943 svc->srv_thread_name, svcpt->scp_thr_nextid);
2948 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2949 svc->srv_thread_name, svcpt->scp_thr_nextid);
2953 svcpt->scp_nthrs_starting++;
2954 thread->t_id = svcpt->scp_thr_nextid++;
2955 thread_add_flags(thread, SVC_STARTING);
2956 thread->t_svcpt = svcpt;
2958 list_add(&thread->t_link, &svcpt->scp_threads);
2959 spin_unlock(&svcpt->scp_lock);
2961 if (svcpt->scp_cpt >= 0) {
2962 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s%02d_%03d",
2963 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2965 snprintf(thread->t_name, PTLRPC_THR_NAME_LEN, "%s_%04d",
2966 svc->srv_thread_name, thread->t_id);
2969 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2970 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
2973 CERROR("cannot start thread '%s': rc = %d\n",
2974 thread->t_name, rc);
2975 spin_lock(&svcpt->scp_lock);
2976 --svcpt->scp_nthrs_starting;
2977 if (thread_is_stopping(thread)) {
2978 /* this ptlrpc_thread is being hanled
2979 * by ptlrpc_svcpt_stop_threads now
2981 thread_add_flags(thread, SVC_STOPPED);
2982 wake_up(&thread->t_ctl_waitq);
2983 spin_unlock(&svcpt->scp_lock);
2985 list_del(&thread->t_link);
2986 spin_unlock(&svcpt->scp_lock);
2987 OBD_FREE_PTR(thread);
2995 l_wait_event(thread->t_ctl_waitq,
2996 thread_is_running(thread) || thread_is_stopped(thread),
2999 rc = thread_is_stopped(thread) ? thread->t_id : 0;
3003 int ptlrpc_hr_init(void)
3005 struct ptlrpc_hr_partition *hrp;
3006 struct ptlrpc_hr_thread *hrt;
3013 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
3014 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
3016 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
3018 if (ptlrpc_hr.hr_partitions == NULL)
3021 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
3023 weight = cpumask_weight(topology_sibling_cpumask(smp_processor_id()));
3025 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3028 atomic_set(&hrp->hrp_nstarted, 0);
3029 atomic_set(&hrp->hrp_nstopped, 0);
3031 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, cpt);
3032 hrp->hrp_nthrs /= weight;
3033 if (hrp->hrp_nthrs == 0)
3036 OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, cpt,
3037 hrp->hrp_nthrs * sizeof(*hrt));
3038 if (hrp->hrp_thrs == NULL)
3039 GOTO(out, rc = -ENOMEM);
3041 for (i = 0; i < hrp->hrp_nthrs; i++) {
3042 hrt = &hrp->hrp_thrs[i];
3045 hrt->hrt_partition = hrp;
3046 init_waitqueue_head(&hrt->hrt_waitq);
3047 spin_lock_init(&hrt->hrt_lock);
3048 INIT_LIST_HEAD(&hrt->hrt_queue);
3052 rc = ptlrpc_start_hr_threads();
3059 void ptlrpc_hr_fini(void)
3061 struct ptlrpc_hr_partition *hrp;
3064 if (ptlrpc_hr.hr_partitions == NULL)
3067 ptlrpc_stop_hr_threads();
3069 cfs_percpt_for_each(hrp, cpt, ptlrpc_hr.hr_partitions) {
3070 if (hrp->hrp_thrs != NULL) {
3071 OBD_FREE(hrp->hrp_thrs,
3072 hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
3076 cfs_percpt_free(ptlrpc_hr.hr_partitions);
3077 ptlrpc_hr.hr_partitions = NULL;
3082 * Wait until all already scheduled replies are processed.
3084 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
3088 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
3091 rc = l_wait_event(svcpt->scp_waitq,
3092 atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
3095 CWARN("Unexpectedly long timeout %s %p\n",
3096 svcpt->scp_service->srv_name, svcpt->scp_service);
3101 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
3103 struct ptlrpc_service_part *svcpt;
3106 /* early disarm AT timer... */
3107 ptlrpc_service_for_each_part(svcpt, i, svc) {
3108 if (svcpt->scp_service != NULL)
3109 del_timer(&svcpt->scp_at_timer);
3114 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
3116 struct ptlrpc_service_part *svcpt;
3117 struct ptlrpc_request_buffer_desc *rqbd;
3118 struct l_wait_info lwi;
3122 /* All history will be culled when the next request buffer is
3123 * freed in ptlrpc_service_purge_all() */
3124 svc->srv_hist_nrqbds_cpt_max = 0;
3126 rc = LNetClearLazyPortal(svc->srv_req_portal);
3129 ptlrpc_service_for_each_part(svcpt, i, svc) {
3130 if (svcpt->scp_service == NULL)
3133 /* Unlink all the request buffers. This forces a 'final'
3134 * event with its 'unlink' flag set for each posted rqbd */
3135 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
3137 rc = LNetMDUnlink(rqbd->rqbd_md_h);
3138 LASSERT(rc == 0 || rc == -ENOENT);
3142 ptlrpc_service_for_each_part(svcpt, i, svc) {
3143 if (svcpt->scp_service == NULL)
3146 /* Wait for the network to release any buffers
3147 * it's currently filling */
3148 spin_lock(&svcpt->scp_lock);
3149 while (svcpt->scp_nrqbds_posted != 0) {
3150 spin_unlock(&svcpt->scp_lock);
3151 /* Network access will complete in finite time but
3152 * the HUGE timeout lets us CWARN for visibility
3153 * of sluggish NALs */
3154 lwi = LWI_TIMEOUT_INTERVAL(
3155 cfs_time_seconds(LONG_UNLINK),
3156 cfs_time_seconds(1), NULL, NULL);
3157 rc = l_wait_event(svcpt->scp_waitq,
3158 svcpt->scp_nrqbds_posted == 0, &lwi);
3159 if (rc == -ETIMEDOUT) {
3160 CWARN("Service %s waiting for "
3161 "request buffers\n",
3162 svcpt->scp_service->srv_name);
3164 spin_lock(&svcpt->scp_lock);
3166 spin_unlock(&svcpt->scp_lock);
3171 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
3173 struct ptlrpc_service_part *svcpt;
3174 struct ptlrpc_request_buffer_desc *rqbd;
3175 struct ptlrpc_request *req;
3176 struct ptlrpc_reply_state *rs;
3179 ptlrpc_service_for_each_part(svcpt, i, svc) {
3180 if (svcpt->scp_service == NULL)
3183 spin_lock(&svcpt->scp_rep_lock);
3184 while (!list_empty(&svcpt->scp_rep_active)) {
3185 rs = list_entry(svcpt->scp_rep_active.next,
3186 struct ptlrpc_reply_state, rs_list);
3187 spin_lock(&rs->rs_lock);
3188 ptlrpc_schedule_difficult_reply(rs);
3189 spin_unlock(&rs->rs_lock);
3191 spin_unlock(&svcpt->scp_rep_lock);
3193 /* purge the request queue. NB No new replies (rqbds
3194 * all unlinked) and no service threads, so I'm the only
3195 * thread noodling the request queue now */
3196 while (!list_empty(&svcpt->scp_req_incoming)) {
3197 req = list_entry(svcpt->scp_req_incoming.next,
3198 struct ptlrpc_request, rq_list);
3200 list_del(&req->rq_list);
3201 svcpt->scp_nreqs_incoming--;
3202 ptlrpc_server_finish_request(svcpt, req);
3205 while (ptlrpc_server_request_pending(svcpt, true)) {
3206 req = ptlrpc_server_request_get(svcpt, true);
3207 ptlrpc_server_finish_active_request(svcpt, req);
3210 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
3211 LASSERT(svcpt->scp_nreqs_incoming == 0);
3212 LASSERT(svcpt->scp_nreqs_active == 0);
3213 /* history should have been culled by
3214 * ptlrpc_server_finish_request */
3215 LASSERT(svcpt->scp_hist_nrqbds == 0);
3217 /* Now free all the request buffers since nothing
3218 * references them any more... */
3220 while (!list_empty(&svcpt->scp_rqbd_idle)) {
3221 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
3222 struct ptlrpc_request_buffer_desc,
3224 ptlrpc_free_rqbd(rqbd);
3226 ptlrpc_wait_replies(svcpt);
3228 while (!list_empty(&svcpt->scp_rep_idle)) {
3229 rs = list_entry(svcpt->scp_rep_idle.next,
3230 struct ptlrpc_reply_state,
3232 list_del(&rs->rs_list);
3233 OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
3239 ptlrpc_service_free(struct ptlrpc_service *svc)
3241 struct ptlrpc_service_part *svcpt;
3242 struct ptlrpc_at_array *array;
3245 ptlrpc_service_for_each_part(svcpt, i, svc) {
3246 if (svcpt->scp_service == NULL)
3249 /* In case somebody rearmed this in the meantime */
3250 del_timer(&svcpt->scp_at_timer);
3251 array = &svcpt->scp_at_array;
3253 if (array->paa_reqs_array != NULL) {
3254 OBD_FREE(array->paa_reqs_array,
3255 sizeof(struct list_head) * array->paa_size);
3256 array->paa_reqs_array = NULL;
3259 if (array->paa_reqs_count != NULL) {
3260 OBD_FREE(array->paa_reqs_count,
3261 sizeof(__u32) * array->paa_size);
3262 array->paa_reqs_count = NULL;
3266 ptlrpc_service_for_each_part(svcpt, i, svc)
3267 OBD_FREE_PTR(svcpt);
3269 if (svc->srv_cpts != NULL)
3270 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
3272 OBD_FREE(svc, offsetof(struct ptlrpc_service,
3273 srv_parts[svc->srv_ncpts]));
3276 int ptlrpc_unregister_service(struct ptlrpc_service *service)
3280 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
3282 service->srv_is_stopping = 1;
3284 mutex_lock(&ptlrpc_all_services_mutex);
3285 list_del_init(&service->srv_list);
3286 mutex_unlock(&ptlrpc_all_services_mutex);
3288 ptlrpc_service_del_atimer(service);
3289 ptlrpc_stop_all_threads(service);
3291 ptlrpc_service_unlink_rqbd(service);
3292 ptlrpc_service_purge_all(service);
3293 ptlrpc_service_nrs_cleanup(service);
3295 ptlrpc_lprocfs_unregister_service(service);
3296 ptlrpc_sysfs_unregister_service(service);
3298 ptlrpc_service_free(service);
3302 EXPORT_SYMBOL(ptlrpc_unregister_service);
3305 * Returns 0 if the service is healthy.
3307 * Right now, it just checks to make sure that requests aren't languishing
3308 * in the queue. We'll use this health check to govern whether a node needs
3309 * to be shot, so it's intentionally non-aggressive. */
3310 static int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
3312 struct ptlrpc_request *request = NULL;
3313 struct timespec64 right_now;
3314 struct timespec64 timediff;
3316 ktime_get_real_ts64(&right_now);
3318 spin_lock(&svcpt->scp_req_lock);
3319 /* How long has the next entry been waiting? */
3320 if (ptlrpc_server_high_pending(svcpt, true))
3321 request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
3322 else if (ptlrpc_server_normal_pending(svcpt, true))
3323 request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
3325 if (request == NULL) {
3326 spin_unlock(&svcpt->scp_req_lock);
3330 timediff = timespec64_sub(right_now, request->rq_arrival_time);
3331 spin_unlock(&svcpt->scp_req_lock);
3333 if ((timediff.tv_sec) >
3334 (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
3335 CERROR("%s: unhealthy - request has been waiting %llds\n",
3336 svcpt->scp_service->srv_name, (s64)timediff.tv_sec);
3344 ptlrpc_service_health_check(struct ptlrpc_service *svc)
3346 struct ptlrpc_service_part *svcpt;
3352 ptlrpc_service_for_each_part(svcpt, i, svc) {
3353 int rc = ptlrpc_svcpt_health_check(svcpt);
3360 EXPORT_SYMBOL(ptlrpc_service_health_check);