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, 2015, 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 "../include/obd_support.h"
35 #include "../include/obd_class.h"
36 #include "../include/lustre_net.h"
37 #include "../include/lu_object.h"
38 #include "../../include/linux/lnet/types.h"
39 #include "ptlrpc_internal.h"
41 /* The following are visible and mutable through /sys/module/ptlrpc */
42 int test_req_buffer_pressure;
43 module_param(test_req_buffer_pressure, int, 0444);
44 MODULE_PARM_DESC(test_req_buffer_pressure, "set non-zero to put pressure on request buffer pools");
45 module_param(at_min, int, 0644);
46 MODULE_PARM_DESC(at_min, "Adaptive timeout minimum (sec)");
47 module_param(at_max, int, 0644);
48 MODULE_PARM_DESC(at_max, "Adaptive timeout maximum (sec)");
49 module_param(at_history, int, 0644);
50 MODULE_PARM_DESC(at_history,
51 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
52 module_param(at_early_margin, int, 0644);
53 MODULE_PARM_DESC(at_early_margin, "How soon before an RPC deadline to send an early reply");
54 module_param(at_extra, int, 0644);
55 MODULE_PARM_DESC(at_extra, "How much extra time to give with each early reply");
58 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt);
59 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req);
60 static void ptlrpc_at_remove_timed(struct ptlrpc_request *req);
62 /** Holds a list of all PTLRPC services */
63 LIST_HEAD(ptlrpc_all_services);
64 /** Used to protect the \e ptlrpc_all_services list */
65 struct mutex ptlrpc_all_services_mutex;
67 static struct ptlrpc_request_buffer_desc *
68 ptlrpc_alloc_rqbd(struct ptlrpc_service_part *svcpt)
70 struct ptlrpc_service *svc = svcpt->scp_service;
71 struct ptlrpc_request_buffer_desc *rqbd;
73 rqbd = kzalloc_node(sizeof(*rqbd), GFP_NOFS,
74 cfs_cpt_spread_node(svc->srv_cptable,
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 rqbd->rqbd_buffer = libcfs_kvzalloc_cpt(svc->srv_cptable,
88 if (!rqbd->rqbd_buffer) {
93 spin_lock(&svcpt->scp_lock);
94 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
95 svcpt->scp_nrqbds_total++;
96 spin_unlock(&svcpt->scp_lock);
102 ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd)
104 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
106 LASSERT(rqbd->rqbd_refcount == 0);
107 LASSERT(list_empty(&rqbd->rqbd_reqs));
109 spin_lock(&svcpt->scp_lock);
110 list_del(&rqbd->rqbd_list);
111 svcpt->scp_nrqbds_total--;
112 spin_unlock(&svcpt->scp_lock);
114 kvfree(rqbd->rqbd_buffer);
119 ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post)
121 struct ptlrpc_service *svc = svcpt->scp_service;
122 struct ptlrpc_request_buffer_desc *rqbd;
126 if (svcpt->scp_rqbd_allocating)
129 spin_lock(&svcpt->scp_lock);
130 /* check again with lock */
131 if (svcpt->scp_rqbd_allocating) {
132 /* NB: we might allow more than one thread in the future */
133 LASSERT(svcpt->scp_rqbd_allocating == 1);
134 spin_unlock(&svcpt->scp_lock);
138 svcpt->scp_rqbd_allocating++;
139 spin_unlock(&svcpt->scp_lock);
141 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
142 /* NB: another thread might have recycled enough rqbds, we
143 * need to make sure it wouldn't over-allocate, see LU-1212.
145 if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group)
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);
177 struct ptlrpc_hr_partition;
179 struct ptlrpc_hr_thread {
180 int hrt_id; /* thread ID */
182 wait_queue_head_t hrt_waitq;
183 struct list_head hrt_queue; /* RS queue */
184 struct ptlrpc_hr_partition *hrt_partition;
187 struct ptlrpc_hr_partition {
188 /* # of started threads */
189 atomic_t hrp_nstarted;
190 /* # of stopped threads */
191 atomic_t hrp_nstopped;
192 /* cpu partition id */
194 /* round-robin rotor for choosing thread */
196 /* total number of threads on this partition */
199 struct ptlrpc_hr_thread *hrp_thrs;
202 #define HRT_RUNNING 0
203 #define HRT_STOPPING 1
205 struct ptlrpc_hr_service {
206 /* CPU partition table, it's just cfs_cpt_table for now */
207 struct cfs_cpt_table *hr_cpt_table;
208 /** controller sleep waitq */
209 wait_queue_head_t hr_waitq;
210 unsigned int hr_stopping;
211 /** roundrobin rotor for non-affinity service */
212 unsigned int hr_rotor;
214 struct ptlrpc_hr_partition **hr_partitions;
217 /** reply handling service. */
218 static struct ptlrpc_hr_service ptlrpc_hr;
221 * Choose an hr thread to dispatch requests to.
223 static struct ptlrpc_hr_thread *
224 ptlrpc_hr_select(struct ptlrpc_service_part *svcpt)
226 struct ptlrpc_hr_partition *hrp;
229 if (svcpt->scp_cpt >= 0 &&
230 svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) {
231 /* directly match partition */
232 hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt];
235 rotor = ptlrpc_hr.hr_rotor++;
236 rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table);
238 hrp = ptlrpc_hr.hr_partitions[rotor];
241 rotor = hrp->hrp_rotor++;
242 return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs];
246 * Put reply state into a queue for processing because we received
247 * ACK from the client
249 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
251 struct ptlrpc_hr_thread *hrt;
253 LASSERT(list_empty(&rs->rs_list));
255 hrt = ptlrpc_hr_select(rs->rs_svcpt);
257 spin_lock(&hrt->hrt_lock);
258 list_add_tail(&rs->rs_list, &hrt->hrt_queue);
259 spin_unlock(&hrt->hrt_lock);
261 wake_up(&hrt->hrt_waitq);
265 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs)
267 assert_spin_locked(&rs->rs_svcpt->scp_rep_lock);
268 assert_spin_locked(&rs->rs_lock);
269 LASSERT(rs->rs_difficult);
270 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
272 if (rs->rs_scheduled) { /* being set up or already notified */
276 rs->rs_scheduled = 1;
277 list_del_init(&rs->rs_list);
278 ptlrpc_dispatch_difficult_reply(rs);
280 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply);
283 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt)
285 struct ptlrpc_request_buffer_desc *rqbd;
290 spin_lock(&svcpt->scp_lock);
292 if (list_empty(&svcpt->scp_rqbd_idle)) {
293 spin_unlock(&svcpt->scp_lock);
297 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
298 struct ptlrpc_request_buffer_desc,
300 list_del(&rqbd->rqbd_list);
302 /* assume we will post successfully */
303 svcpt->scp_nrqbds_posted++;
304 list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted);
306 spin_unlock(&svcpt->scp_lock);
308 rc = ptlrpc_register_rqbd(rqbd);
315 spin_lock(&svcpt->scp_lock);
317 svcpt->scp_nrqbds_posted--;
318 list_del(&rqbd->rqbd_list);
319 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
321 /* Don't complain if no request buffers are posted right now; LNET
322 * won't drop requests because we set the portal lazy!
325 spin_unlock(&svcpt->scp_lock);
330 static void ptlrpc_at_timer(unsigned long castmeharder)
332 struct ptlrpc_service_part *svcpt;
334 svcpt = (struct ptlrpc_service_part *)castmeharder;
336 svcpt->scp_at_check = 1;
337 svcpt->scp_at_checktime = cfs_time_current();
338 wake_up(&svcpt->scp_waitq);
342 ptlrpc_server_nthreads_check(struct ptlrpc_service *svc,
343 struct ptlrpc_service_conf *conf)
345 struct ptlrpc_service_thr_conf *tc = &conf->psc_thr;
352 * Common code for estimating & validating threads number.
353 * CPT affinity service could have percpt thread-pool instead
354 * of a global thread-pool, which means user might not always
355 * get the threads number they give it in conf::tc_nthrs_user
356 * even they did set. It's because we need to validate threads
357 * number for each CPT to guarantee each pool will have enough
358 * threads to keep the service healthy.
360 init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL);
361 init = max_t(int, init, tc->tc_nthrs_init);
363 /* NB: please see comments in lustre_lnet.h for definition
364 * details of these members
366 LASSERT(tc->tc_nthrs_max != 0);
368 if (tc->tc_nthrs_user != 0) {
369 /* In case there is a reason to test a service with many
370 * threads, we give a less strict check here, it can
371 * be up to 8 * nthrs_max
373 total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user);
374 nthrs = total / svc->srv_ncpts;
375 init = max(init, nthrs);
379 total = tc->tc_nthrs_max;
380 if (tc->tc_nthrs_base == 0) {
381 /* don't care about base threads number per partition,
382 * this is most for non-affinity service
384 nthrs = total / svc->srv_ncpts;
388 nthrs = tc->tc_nthrs_base;
389 if (svc->srv_ncpts == 1) {
392 /* NB: Increase the base number if it's single partition
393 * and total number of cores/HTs is larger or equal to 4.
394 * result will always < 2 * nthrs_base
396 weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY);
397 for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */
398 (tc->tc_nthrs_base >> i) != 0; i++)
399 nthrs += tc->tc_nthrs_base >> i;
402 if (tc->tc_thr_factor != 0) {
403 int factor = tc->tc_thr_factor;
407 * User wants to increase number of threads with for
408 * each CPU core/HT, most likely the factor is larger then
409 * one thread/core because service threads are supposed to
410 * be blocked by lock or wait for IO.
413 * Amdahl's law says that adding processors wouldn't give
414 * a linear increasing of parallelism, so it's nonsense to
415 * have too many threads no matter how many cores/HTs
418 /* weight is # of HTs */
419 if (cpumask_weight(topology_sibling_cpumask(0)) > 1) {
420 /* depress thread factor for hyper-thread */
421 factor = factor - (factor >> 1) + (factor >> 3);
424 weight = cfs_cpt_weight(svc->srv_cptable, 0);
427 for (; factor > 0 && weight > 0; factor--, weight -= fade)
428 nthrs += min(weight, fade) * factor;
431 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
432 nthrs = max(tc->tc_nthrs_base,
433 tc->tc_nthrs_max / svc->srv_ncpts);
436 nthrs = max(nthrs, tc->tc_nthrs_init);
437 svc->srv_nthrs_cpt_limit = nthrs;
438 svc->srv_nthrs_cpt_init = init;
440 if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) {
441 CDEBUG(D_OTHER, "%s: This service may have more threads (%d) than the given soft limit (%d)\n",
442 svc->srv_name, nthrs * svc->srv_ncpts,
448 * Initialize percpt data for a service
451 ptlrpc_service_part_init(struct ptlrpc_service *svc,
452 struct ptlrpc_service_part *svcpt, int cpt)
454 struct ptlrpc_at_array *array;
459 svcpt->scp_cpt = cpt;
460 INIT_LIST_HEAD(&svcpt->scp_threads);
462 /* rqbd and incoming request queue */
463 spin_lock_init(&svcpt->scp_lock);
464 INIT_LIST_HEAD(&svcpt->scp_rqbd_idle);
465 INIT_LIST_HEAD(&svcpt->scp_rqbd_posted);
466 INIT_LIST_HEAD(&svcpt->scp_req_incoming);
467 init_waitqueue_head(&svcpt->scp_waitq);
468 /* history request & rqbd list */
469 INIT_LIST_HEAD(&svcpt->scp_hist_reqs);
470 INIT_LIST_HEAD(&svcpt->scp_hist_rqbds);
472 /* active requests and hp requests */
473 spin_lock_init(&svcpt->scp_req_lock);
476 spin_lock_init(&svcpt->scp_rep_lock);
477 INIT_LIST_HEAD(&svcpt->scp_rep_active);
478 INIT_LIST_HEAD(&svcpt->scp_rep_idle);
479 init_waitqueue_head(&svcpt->scp_rep_waitq);
480 atomic_set(&svcpt->scp_nreps_difficult, 0);
482 /* adaptive timeout */
483 spin_lock_init(&svcpt->scp_at_lock);
484 array = &svcpt->scp_at_array;
486 size = at_est2timeout(at_max);
487 array->paa_size = size;
488 array->paa_count = 0;
489 array->paa_deadline = -1;
491 /* allocate memory for scp_at_array (ptlrpc_at_array) */
492 array->paa_reqs_array =
493 kzalloc_node(sizeof(struct list_head) * size, GFP_NOFS,
494 cfs_cpt_spread_node(svc->srv_cptable, cpt));
495 if (!array->paa_reqs_array)
498 for (index = 0; index < size; index++)
499 INIT_LIST_HEAD(&array->paa_reqs_array[index]);
501 array->paa_reqs_count =
502 kzalloc_node(sizeof(__u32) * size, GFP_NOFS,
503 cfs_cpt_spread_node(svc->srv_cptable, cpt));
504 if (!array->paa_reqs_count)
505 goto free_reqs_array;
507 setup_timer(&svcpt->scp_at_timer, ptlrpc_at_timer,
508 (unsigned long)svcpt);
510 /* At SOW, service time should be quick; 10s seems generous. If client
511 * timeout is less than this, we'll be sending an early reply.
513 at_init(&svcpt->scp_at_estimate, 10, 0);
515 /* assign this before call ptlrpc_grow_req_bufs */
516 svcpt->scp_service = svc;
517 /* Now allocate the request buffers, but don't post them now */
518 rc = ptlrpc_grow_req_bufs(svcpt, 0);
519 /* We shouldn't be under memory pressure at startup, so
520 * fail if we can't allocate all our buffers at this time.
523 goto free_reqs_count;
528 kfree(array->paa_reqs_count);
529 array->paa_reqs_count = NULL;
531 kfree(array->paa_reqs_array);
532 array->paa_reqs_array = NULL;
538 * Initialize service on a given portal.
539 * This includes starting serving threads , allocating and posting rqbds and
542 struct ptlrpc_service *
543 ptlrpc_register_service(struct ptlrpc_service_conf *conf,
545 struct dentry *debugfs_entry)
547 struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt;
548 struct ptlrpc_service *service;
549 struct ptlrpc_service_part *svcpt;
550 struct cfs_cpt_table *cptable;
557 LASSERT(conf->psc_buf.bc_nbufs > 0);
558 LASSERT(conf->psc_buf.bc_buf_size >=
559 conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD);
560 LASSERT(conf->psc_thr.tc_ctx_tags != 0);
562 cptable = cconf->cc_cptable;
564 cptable = cfs_cpt_table;
566 if (!conf->psc_thr.tc_cpu_affinity) {
569 ncpts = cfs_cpt_number(cptable);
570 if (cconf->cc_pattern) {
571 struct cfs_expr_list *el;
573 rc = cfs_expr_list_parse(cconf->cc_pattern,
574 strlen(cconf->cc_pattern),
577 CERROR("%s: invalid CPT pattern string: %s",
578 conf->psc_name, cconf->cc_pattern);
579 return ERR_PTR(-EINVAL);
582 rc = cfs_expr_list_values(el, ncpts, &cpts);
583 cfs_expr_list_free(el);
585 CERROR("%s: failed to parse CPT array %s: %d\n",
586 conf->psc_name, cconf->cc_pattern, rc);
588 return ERR_PTR(rc < 0 ? rc : -EINVAL);
594 service = kzalloc(offsetof(struct ptlrpc_service, srv_parts[ncpts]),
598 return ERR_PTR(-ENOMEM);
601 service->srv_cptable = cptable;
602 service->srv_cpts = cpts;
603 service->srv_ncpts = ncpts;
605 service->srv_cpt_bits = 0; /* it's zero already, easy to read... */
606 while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable))
607 service->srv_cpt_bits++;
610 spin_lock_init(&service->srv_lock);
611 service->srv_name = conf->psc_name;
612 service->srv_watchdog_factor = conf->psc_watchdog_factor;
613 INIT_LIST_HEAD(&service->srv_list); /* for safety of cleanup */
615 /* buffer configuration */
616 service->srv_nbuf_per_group = test_req_buffer_pressure ?
617 1 : conf->psc_buf.bc_nbufs;
618 service->srv_max_req_size = conf->psc_buf.bc_req_max_size +
620 service->srv_buf_size = conf->psc_buf.bc_buf_size;
621 service->srv_rep_portal = conf->psc_buf.bc_rep_portal;
622 service->srv_req_portal = conf->psc_buf.bc_req_portal;
624 /* Increase max reply size to next power of two */
625 service->srv_max_reply_size = 1;
626 while (service->srv_max_reply_size <
627 conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD)
628 service->srv_max_reply_size <<= 1;
630 service->srv_thread_name = conf->psc_thr.tc_thr_name;
631 service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags;
632 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
633 service->srv_ops = conf->psc_ops;
635 for (i = 0; i < ncpts; i++) {
636 if (!conf->psc_thr.tc_cpu_affinity)
639 cpt = cpts ? cpts[i] : i;
641 svcpt = kzalloc_node(sizeof(*svcpt), GFP_NOFS,
642 cfs_cpt_spread_node(cptable, cpt));
648 service->srv_parts[i] = svcpt;
649 rc = ptlrpc_service_part_init(service, svcpt, cpt);
654 ptlrpc_server_nthreads_check(service, conf);
656 rc = LNetSetLazyPortal(service->srv_req_portal);
659 mutex_lock(&ptlrpc_all_services_mutex);
660 list_add(&service->srv_list, &ptlrpc_all_services);
661 mutex_unlock(&ptlrpc_all_services_mutex);
664 rc = ptlrpc_sysfs_register_service(parent, service);
669 if (!IS_ERR_OR_NULL(debugfs_entry))
670 ptlrpc_ldebugfs_register_service(debugfs_entry, service);
672 rc = ptlrpc_service_nrs_setup(service);
676 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
677 service->srv_name, service->srv_req_portal);
679 rc = ptlrpc_start_threads(service);
681 CERROR("Failed to start threads for service %s: %d\n",
682 service->srv_name, rc);
688 ptlrpc_unregister_service(service);
691 EXPORT_SYMBOL(ptlrpc_register_service);
694 * to actually free the request, must be called without holding svc_lock.
695 * note it's caller's responsibility to unlink req->rq_list.
697 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
699 LASSERT(atomic_read(&req->rq_refcount) == 0);
700 LASSERT(list_empty(&req->rq_timed_list));
702 /* DEBUG_REQ() assumes the reply state of a request with a valid
703 * ref will not be destroyed until that reference is dropped.
705 ptlrpc_req_drop_rs(req);
707 sptlrpc_svc_ctx_decref(req);
709 if (req != &req->rq_rqbd->rqbd_req) {
710 /* NB request buffers use an embedded
711 * req if the incoming req unlinked the
712 * MD; this isn't one of them!
714 ptlrpc_request_cache_free(req);
719 * drop a reference count of the request. if it reaches 0, we either
720 * put it into history list, or free it immediately.
722 static void ptlrpc_server_drop_request(struct ptlrpc_request *req)
724 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
725 struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
726 struct ptlrpc_service *svc = svcpt->scp_service;
728 struct list_head *tmp;
729 struct list_head *nxt;
731 if (!atomic_dec_and_test(&req->rq_refcount))
734 if (req->rq_at_linked) {
735 spin_lock(&svcpt->scp_at_lock);
736 /* recheck with lock, in case it's unlinked by
737 * ptlrpc_at_check_timed()
739 if (likely(req->rq_at_linked))
740 ptlrpc_at_remove_timed(req);
741 spin_unlock(&svcpt->scp_at_lock);
744 LASSERT(list_empty(&req->rq_timed_list));
746 /* finalize request */
747 if (req->rq_export) {
748 class_export_put(req->rq_export);
749 req->rq_export = NULL;
752 spin_lock(&svcpt->scp_lock);
754 list_add(&req->rq_list, &rqbd->rqbd_reqs);
756 refcount = --(rqbd->rqbd_refcount);
758 /* request buffer is now idle: add to history */
759 list_del(&rqbd->rqbd_list);
761 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds);
762 svcpt->scp_hist_nrqbds++;
764 /* cull some history?
765 * I expect only about 1 or 2 rqbds need to be recycled here
767 while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) {
768 rqbd = list_entry(svcpt->scp_hist_rqbds.next,
769 struct ptlrpc_request_buffer_desc,
772 list_del(&rqbd->rqbd_list);
773 svcpt->scp_hist_nrqbds--;
775 /* remove rqbd's reqs from svc's req history while
776 * I've got the service lock
778 list_for_each(tmp, &rqbd->rqbd_reqs) {
779 req = list_entry(tmp, struct ptlrpc_request,
781 /* Track the highest culled req seq */
782 if (req->rq_history_seq >
783 svcpt->scp_hist_seq_culled) {
784 svcpt->scp_hist_seq_culled =
787 list_del(&req->rq_history_list);
790 spin_unlock(&svcpt->scp_lock);
792 list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
793 req = list_entry(rqbd->rqbd_reqs.next,
794 struct ptlrpc_request,
796 list_del(&req->rq_list);
797 ptlrpc_server_free_request(req);
800 spin_lock(&svcpt->scp_lock);
802 * now all reqs including the embedded req has been
803 * disposed, schedule request buffer for re-use.
805 LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) ==
807 list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle);
810 spin_unlock(&svcpt->scp_lock);
811 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
812 /* If we are low on memory, we are not interested in history */
813 list_del(&req->rq_list);
814 list_del_init(&req->rq_history_list);
816 /* Track the highest culled req seq */
817 if (req->rq_history_seq > svcpt->scp_hist_seq_culled)
818 svcpt->scp_hist_seq_culled = req->rq_history_seq;
820 spin_unlock(&svcpt->scp_lock);
822 ptlrpc_server_free_request(req);
824 spin_unlock(&svcpt->scp_lock);
829 * to finish a request: stop sending more early replies, and release
832 static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt,
833 struct ptlrpc_request *req)
835 ptlrpc_server_hpreq_fini(req);
837 if (req->rq_session.lc_thread) {
838 lu_context_exit(&req->rq_session);
839 lu_context_fini(&req->rq_session);
842 ptlrpc_server_drop_request(req);
846 * to finish a active request: stop sending more early replies, and release
847 * the request. should be called after we finished handling the request.
849 static void ptlrpc_server_finish_active_request(
850 struct ptlrpc_service_part *svcpt,
851 struct ptlrpc_request *req)
853 spin_lock(&svcpt->scp_req_lock);
854 ptlrpc_nrs_req_stop_nolock(req);
855 svcpt->scp_nreqs_active--;
857 svcpt->scp_nhreqs_active--;
858 spin_unlock(&svcpt->scp_req_lock);
860 ptlrpc_nrs_req_finalize(req);
863 class_export_rpc_dec(req->rq_export);
865 ptlrpc_server_finish_request(svcpt, req);
869 * Sanity check request \a req.
870 * Return 0 if all is ok, error code otherwise.
872 static int ptlrpc_check_req(struct ptlrpc_request *req)
874 struct obd_device *obd = req->rq_export->exp_obd;
877 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
878 req->rq_export->exp_conn_cnt)) {
879 DEBUG_REQ(D_RPCTRACE, req,
880 "DROPPING req from old connection %d < %d",
881 lustre_msg_get_conn_cnt(req->rq_reqmsg),
882 req->rq_export->exp_conn_cnt);
885 if (unlikely(!obd || obd->obd_fail)) {
887 * Failing over, don't handle any more reqs, send
888 * error response instead.
890 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
891 req, obd ? obd->obd_name : "unknown");
893 } else if (lustre_msg_get_flags(req->rq_reqmsg) &
894 (MSG_REPLAY | MSG_REQ_REPLAY_DONE)) {
895 DEBUG_REQ(D_ERROR, req, "Invalid replay without recovery");
896 class_fail_export(req->rq_export);
898 } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0) {
899 DEBUG_REQ(D_ERROR, req,
900 "Invalid req with transno %llu without recovery",
901 lustre_msg_get_transno(req->rq_reqmsg));
902 class_fail_export(req->rq_export);
906 if (unlikely(rc < 0)) {
913 static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
915 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
918 if (array->paa_count == 0) {
919 del_timer(&svcpt->scp_at_timer);
923 /* Set timer for closest deadline */
924 next = (__s32)(array->paa_deadline - ktime_get_real_seconds() -
927 ptlrpc_at_timer((unsigned long)svcpt);
929 mod_timer(&svcpt->scp_at_timer, cfs_time_shift(next));
930 CDEBUG(D_INFO, "armed %s at %+ds\n",
931 svcpt->scp_service->srv_name, next);
935 /* Add rpc to early reply check list */
936 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
938 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
939 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
940 struct ptlrpc_request *rq = NULL;
946 if (req->rq_no_reply)
949 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
952 spin_lock(&svcpt->scp_at_lock);
953 LASSERT(list_empty(&req->rq_timed_list));
955 div_u64_rem(req->rq_deadline, array->paa_size, &index);
956 if (array->paa_reqs_count[index] > 0) {
957 /* latest rpcs will have the latest deadlines in the list,
958 * so search backward.
960 list_for_each_entry_reverse(rq, &array->paa_reqs_array[index],
962 if (req->rq_deadline >= rq->rq_deadline) {
963 list_add(&req->rq_timed_list,
970 /* Add the request at the head of the list */
971 if (list_empty(&req->rq_timed_list))
972 list_add(&req->rq_timed_list, &array->paa_reqs_array[index]);
974 spin_lock(&req->rq_lock);
975 req->rq_at_linked = 1;
976 spin_unlock(&req->rq_lock);
977 req->rq_at_index = index;
978 array->paa_reqs_count[index]++;
980 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
981 array->paa_deadline = req->rq_deadline;
982 ptlrpc_at_set_timer(svcpt);
984 spin_unlock(&svcpt->scp_at_lock);
990 ptlrpc_at_remove_timed(struct ptlrpc_request *req)
992 struct ptlrpc_at_array *array;
994 array = &req->rq_rqbd->rqbd_svcpt->scp_at_array;
996 /* NB: must call with hold svcpt::scp_at_lock */
997 LASSERT(!list_empty(&req->rq_timed_list));
998 list_del_init(&req->rq_timed_list);
1000 spin_lock(&req->rq_lock);
1001 req->rq_at_linked = 0;
1002 spin_unlock(&req->rq_lock);
1004 array->paa_reqs_count[req->rq_at_index]--;
1008 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1010 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1011 struct ptlrpc_request *reqcopy;
1012 struct lustre_msg *reqmsg;
1013 long olddl = req->rq_deadline - ktime_get_real_seconds();
1017 /* deadline is when the client expects us to reply, margin is the
1018 * difference between clients' and servers' expectations
1020 DEBUG_REQ(D_ADAPTTO, req,
1021 "%ssending early reply (deadline %+lds, margin %+lds) for %d+%d",
1022 AT_OFF ? "AT off - not " : "",
1023 olddl, olddl - at_get(&svcpt->scp_at_estimate),
1024 at_get(&svcpt->scp_at_estimate), at_extra);
1030 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), not sending early reply. Consider increasing at_early_margin (%d)?",
1031 olddl, at_early_margin);
1033 /* Return an error so we're not re-added to the timed list. */
1037 if (!(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
1038 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, but no AT support");
1042 /* Fake our processing time into the future to ask the clients
1043 * for some extra amount of time
1045 at_measured(&svcpt->scp_at_estimate, at_extra +
1046 ktime_get_real_seconds() - req->rq_arrival_time.tv_sec);
1048 /* Check to see if we've actually increased the deadline -
1049 * we may be past adaptive_max
1051 if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
1052 at_get(&svcpt->scp_at_estimate)) {
1053 DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%ld/%lld), not sending early reply\n",
1054 olddl, req->rq_arrival_time.tv_sec +
1055 at_get(&svcpt->scp_at_estimate) -
1056 ktime_get_real_seconds());
1059 newdl = ktime_get_real_seconds() + at_get(&svcpt->scp_at_estimate);
1061 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1064 reqmsg = libcfs_kvzalloc(req->rq_reqlen, GFP_NOFS);
1071 reqcopy->rq_reply_state = NULL;
1072 reqcopy->rq_rep_swab_mask = 0;
1073 reqcopy->rq_pack_bulk = 0;
1074 reqcopy->rq_pack_udesc = 0;
1075 reqcopy->rq_packed_final = 0;
1076 sptlrpc_svc_ctx_addref(reqcopy);
1077 /* We only need the reqmsg for the magic */
1078 reqcopy->rq_reqmsg = reqmsg;
1079 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1081 LASSERT(atomic_read(&req->rq_refcount));
1082 /** if it is last refcount then early reply isn't needed */
1083 if (atomic_read(&req->rq_refcount) == 1) {
1084 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, abort sending early reply\n");
1089 /* Connection ref */
1090 reqcopy->rq_export = class_conn2export(
1091 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1092 if (!reqcopy->rq_export) {
1098 class_export_rpc_inc(reqcopy->rq_export);
1099 if (reqcopy->rq_export->exp_obd &&
1100 reqcopy->rq_export->exp_obd->obd_fail) {
1105 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1109 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1112 /* Adjust our own deadline to what we told the client */
1113 req->rq_deadline = newdl;
1114 req->rq_early_count++; /* number sent, server side */
1116 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1119 /* Free the (early) reply state from lustre_pack_reply.
1120 * (ptlrpc_send_reply takes it's own rs ref, so this is safe here)
1122 ptlrpc_req_drop_rs(reqcopy);
1125 class_export_rpc_dec(reqcopy->rq_export);
1126 class_export_put(reqcopy->rq_export);
1128 sptlrpc_svc_ctx_decref(reqcopy);
1131 ptlrpc_request_cache_free(reqcopy);
1135 /* Send early replies to everybody expiring within at_early_margin
1136 * asking for at_extra time
1138 static void ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1140 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1141 struct ptlrpc_request *rq, *n;
1142 struct list_head work_list;
1145 time64_t now = ktime_get_real_seconds();
1147 int first, counter = 0;
1149 spin_lock(&svcpt->scp_at_lock);
1150 if (svcpt->scp_at_check == 0) {
1151 spin_unlock(&svcpt->scp_at_lock);
1154 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1155 svcpt->scp_at_check = 0;
1157 if (array->paa_count == 0) {
1158 spin_unlock(&svcpt->scp_at_lock);
1162 /* The timer went off, but maybe the nearest rpc already completed. */
1163 first = array->paa_deadline - now;
1164 if (first > at_early_margin) {
1165 /* We've still got plenty of time. Reset the timer. */
1166 ptlrpc_at_set_timer(svcpt);
1167 spin_unlock(&svcpt->scp_at_lock);
1171 /* We're close to a timeout, and we don't know how much longer the
1172 * server will take. Send early replies to everyone expiring soon.
1174 INIT_LIST_HEAD(&work_list);
1176 div_u64_rem(array->paa_deadline, array->paa_size, &index);
1177 count = array->paa_count;
1179 count -= array->paa_reqs_count[index];
1180 list_for_each_entry_safe(rq, n, &array->paa_reqs_array[index],
1182 if (rq->rq_deadline > now + at_early_margin) {
1183 /* update the earliest deadline */
1184 if (deadline == -1 ||
1185 rq->rq_deadline < deadline)
1186 deadline = rq->rq_deadline;
1190 ptlrpc_at_remove_timed(rq);
1192 * ptlrpc_server_drop_request() may drop
1193 * refcount to 0 already. Let's check this and
1194 * don't add entry to work_list
1196 if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
1197 list_add(&rq->rq_timed_list, &work_list);
1201 if (++index >= array->paa_size)
1204 array->paa_deadline = deadline;
1205 /* we have a new earliest deadline, restart the timer */
1206 ptlrpc_at_set_timer(svcpt);
1208 spin_unlock(&svcpt->scp_at_lock);
1210 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early replies\n",
1211 first, at_extra, counter);
1213 /* We're already past request deadlines before we even get a
1214 * chance to send early replies
1216 LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
1217 svcpt->scp_service->srv_name);
1218 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%ld(jiff)\n",
1219 counter, svcpt->scp_nreqs_incoming,
1220 svcpt->scp_nreqs_active,
1221 at_get(&svcpt->scp_at_estimate), delay);
1224 /* we took additional refcount so entries can't be deleted from list, no
1227 while (!list_empty(&work_list)) {
1228 rq = list_entry(work_list.next, struct ptlrpc_request,
1230 list_del_init(&rq->rq_timed_list);
1232 if (ptlrpc_at_send_early_reply(rq) == 0)
1233 ptlrpc_at_add_timed(rq);
1235 ptlrpc_server_drop_request(rq);
1240 * Put the request to the export list if the request may become
1241 * a high priority one.
1243 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1244 struct ptlrpc_request *req)
1248 if (svcpt->scp_service->srv_ops.so_hpreq_handler) {
1249 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1254 if (req->rq_export && req->rq_ops) {
1255 /* Perform request specific check. We should do this check
1256 * before the request is added into exp_hp_rpcs list otherwise
1257 * it may hit swab race at LU-1044.
1259 if (req->rq_ops->hpreq_check) {
1260 rc = req->rq_ops->hpreq_check(req);
1262 * XXX: Out of all current
1263 * ptlrpc_hpreq_ops::hpreq_check(), only
1264 * ldlm_cancel_hpreq_check() can return an error code;
1265 * other functions assert in similar places, which seems
1266 * odd. What also does not seem right is that handlers
1267 * for those RPCs do not assert on the same checks, but
1268 * rather handle the error cases. e.g. see
1269 * ost_rw_hpreq_check(), and ost_brw_read(),
1274 LASSERT(rc == 0 || rc == 1);
1277 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1278 list_add(&req->rq_exp_list, &req->rq_export->exp_hp_rpcs);
1279 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1282 ptlrpc_nrs_req_initialize(svcpt, req, rc);
1287 /** Remove the request from the export list. */
1288 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1290 if (req->rq_export && req->rq_ops) {
1291 /* refresh lock timeout again so that client has more
1292 * room to send lock cancel RPC.
1294 if (req->rq_ops->hpreq_fini)
1295 req->rq_ops->hpreq_fini(req);
1297 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1298 list_del_init(&req->rq_exp_list);
1299 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1303 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1304 struct ptlrpc_request *req)
1308 rc = ptlrpc_server_hpreq_init(svcpt, req);
1312 ptlrpc_nrs_req_add(svcpt, req, !!rc);
1318 * Allow to handle high priority request
1319 * User can call it w/o any lock but need to hold
1320 * ptlrpc_service_part::scp_req_lock to get reliable result
1322 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1325 int running = svcpt->scp_nthrs_running;
1327 if (!nrs_svcpt_has_hp(svcpt))
1333 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1334 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1335 /* leave just 1 thread for normal RPCs */
1336 running = PTLRPC_NTHRS_INIT;
1337 if (svcpt->scp_service->srv_ops.so_hpreq_handler)
1341 if (svcpt->scp_nreqs_active >= running - 1)
1344 if (svcpt->scp_nhreqs_active == 0)
1347 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1348 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1351 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1354 return ptlrpc_server_allow_high(svcpt, force) &&
1355 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1359 * Only allow normal priority requests on a service that has a high-priority
1360 * queue if forced (i.e. cleanup), if there are other high priority requests
1361 * already being processed (i.e. those threads can service more high-priority
1362 * requests), or if there are enough idle threads that a later thread can do
1363 * a high priority request.
1364 * User can call it w/o any lock but need to hold
1365 * ptlrpc_service_part::scp_req_lock to get reliable result
1367 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1370 int running = svcpt->scp_nthrs_running;
1372 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1373 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1374 /* leave just 1 thread for normal RPCs */
1375 running = PTLRPC_NTHRS_INIT;
1376 if (svcpt->scp_service->srv_ops.so_hpreq_handler)
1381 svcpt->scp_nreqs_active < running - 2)
1384 if (svcpt->scp_nreqs_active >= running - 1)
1387 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1390 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1393 return ptlrpc_server_allow_normal(svcpt, force) &&
1394 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1398 * Returns true if there are requests available in incoming
1399 * request queue for processing and it is allowed to fetch them.
1400 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1401 * to get reliable result
1402 * \see ptlrpc_server_allow_normal
1403 * \see ptlrpc_server_allow high
1406 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1408 return ptlrpc_server_high_pending(svcpt, force) ||
1409 ptlrpc_server_normal_pending(svcpt, force);
1413 * Fetch a request for processing from queue of unprocessed requests.
1414 * Favors high-priority requests.
1415 * Returns a pointer to fetched request.
1417 static struct ptlrpc_request *
1418 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1420 struct ptlrpc_request *req = NULL;
1422 spin_lock(&svcpt->scp_req_lock);
1424 if (ptlrpc_server_high_pending(svcpt, force)) {
1425 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1427 svcpt->scp_hreq_count++;
1432 if (ptlrpc_server_normal_pending(svcpt, force)) {
1433 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1435 svcpt->scp_hreq_count = 0;
1440 spin_unlock(&svcpt->scp_req_lock);
1444 svcpt->scp_nreqs_active++;
1446 svcpt->scp_nhreqs_active++;
1448 spin_unlock(&svcpt->scp_req_lock);
1450 if (likely(req->rq_export))
1451 class_export_rpc_inc(req->rq_export);
1457 * Handle freshly incoming reqs, add to timed early reply list,
1458 * pass on to regular request queue.
1459 * All incoming requests pass through here before getting into
1460 * ptlrpc_server_handle_req later on.
1463 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1464 struct ptlrpc_thread *thread)
1466 struct ptlrpc_service *svc = svcpt->scp_service;
1467 struct ptlrpc_request *req;
1471 spin_lock(&svcpt->scp_lock);
1472 if (list_empty(&svcpt->scp_req_incoming)) {
1473 spin_unlock(&svcpt->scp_lock);
1477 req = list_entry(svcpt->scp_req_incoming.next,
1478 struct ptlrpc_request, rq_list);
1479 list_del_init(&req->rq_list);
1480 svcpt->scp_nreqs_incoming--;
1481 /* Consider this still a "queued" request as far as stats are
1484 spin_unlock(&svcpt->scp_lock);
1486 /* go through security check/transform */
1487 rc = sptlrpc_svc_unwrap_request(req);
1491 case SECSVC_COMPLETE:
1492 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1501 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1502 * redo it wouldn't be harmful.
1504 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1505 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1507 CERROR("error unpacking request: ptl %d from %s x%llu\n",
1508 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1514 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1516 CERROR("error unpacking ptlrpc body: ptl %d from %s x%llu\n",
1517 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1522 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1523 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1524 CERROR("drop incoming rpc opc %u, x%llu\n",
1525 cfs_fail_val, req->rq_xid);
1530 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1531 CERROR("wrong packet type received (type=%u) from %s\n",
1532 lustre_msg_get_type(req->rq_reqmsg),
1533 libcfs_id2str(req->rq_peer));
1537 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1540 req->rq_bulk_write = 1;
1544 case MGS_CONFIG_READ:
1545 req->rq_bulk_read = 1;
1549 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
1551 req->rq_export = class_conn2export(
1552 lustre_msg_get_handle(req->rq_reqmsg));
1553 if (req->rq_export) {
1554 rc = ptlrpc_check_req(req);
1556 rc = sptlrpc_target_export_check(req->rq_export, req);
1558 DEBUG_REQ(D_ERROR, req, "DROPPING req with illegal security flavor,");
1565 /* req_in handling should/must be fast */
1566 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
1567 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1568 (long)(ktime_get_real_seconds() -
1569 req->rq_arrival_time.tv_sec));
1571 /* Set rpc server deadline and add it to the timed list */
1572 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1573 MSGHDR_AT_SUPPORT) ?
1574 /* The max time the client expects us to take */
1575 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1576 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1577 if (unlikely(deadline == 0)) {
1578 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1582 req->rq_svc_thread = thread;
1584 /* initialize request session, it is needed for request
1585 * processing by target
1587 rc = lu_context_init(&req->rq_session,
1588 LCT_SERVER_SESSION | LCT_NOREF);
1590 CERROR("%s: failure to initialize session: rc = %d\n",
1591 thread->t_name, rc);
1594 req->rq_session.lc_thread = thread;
1595 lu_context_enter(&req->rq_session);
1596 req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1599 ptlrpc_at_add_timed(req);
1601 /* Move it over to the request processing queue */
1602 rc = ptlrpc_server_request_add(svcpt, req);
1606 wake_up(&svcpt->scp_waitq);
1610 ptlrpc_server_finish_request(svcpt, req);
1616 * Main incoming request handling logic.
1617 * Calls handler function from service to do actual processing.
1620 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
1621 struct ptlrpc_thread *thread)
1623 struct ptlrpc_service *svc = svcpt->scp_service;
1624 struct ptlrpc_request *request;
1625 struct timespec64 work_start;
1626 struct timespec64 work_end;
1627 struct timespec64 timediff;
1628 struct timespec64 arrived;
1629 unsigned long timediff_usecs;
1630 unsigned long arrived_usecs;
1633 request = ptlrpc_server_request_get(svcpt, false);
1637 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1638 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1639 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1640 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1642 if (unlikely(fail_opc)) {
1643 if (request->rq_export && request->rq_ops)
1644 OBD_FAIL_TIMEOUT(fail_opc, 4);
1647 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1649 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1650 libcfs_debug_dumplog();
1652 ktime_get_real_ts64(&work_start);
1653 timediff = timespec64_sub(work_start, request->rq_arrival_time);
1654 timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
1655 timediff.tv_nsec / NSEC_PER_USEC;
1656 if (likely(svc->srv_stats)) {
1657 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1659 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1660 svcpt->scp_nreqs_incoming);
1661 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1662 svcpt->scp_nreqs_active);
1663 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1664 at_get(&svcpt->scp_at_estimate));
1667 if (likely(request->rq_export)) {
1668 if (unlikely(ptlrpc_check_req(request)))
1672 /* Discard requests queued for longer than the deadline.
1673 * The deadline is increased if we send an early reply.
1675 if (ktime_get_real_seconds() > request->rq_deadline) {
1676 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline " CFS_DURATION_T ":" CFS_DURATION_T "s ago\n",
1677 libcfs_id2str(request->rq_peer),
1678 (long)(request->rq_deadline -
1679 request->rq_arrival_time.tv_sec),
1680 (long)(ktime_get_real_seconds() -
1681 request->rq_deadline));
1685 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d\n",
1687 (request->rq_export ?
1688 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1689 (request->rq_export ?
1690 atomic_read(&request->rq_export->exp_refcount) : -99),
1691 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1692 libcfs_id2str(request->rq_peer),
1693 lustre_msg_get_opc(request->rq_reqmsg));
1695 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1696 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
1698 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
1700 /* re-assign request and sesson thread to the current one */
1701 request->rq_svc_thread = thread;
1703 LASSERT(request->rq_session.lc_thread);
1704 request->rq_session.lc_thread = thread;
1705 request->rq_session.lc_cookie = 0x55;
1706 thread->t_env->le_ses = &request->rq_session;
1708 svc->srv_ops.so_req_handler(request);
1710 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1713 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
1714 DEBUG_REQ(D_WARNING, request,
1715 "Request took longer than estimated (%lld:%llds); "
1716 "client may timeout.",
1717 (s64)request->rq_deadline -
1718 request->rq_arrival_time.tv_sec,
1719 (s64)ktime_get_real_seconds() - request->rq_deadline);
1722 ktime_get_real_ts64(&work_end);
1723 timediff = timespec64_sub(work_end, work_start);
1724 timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
1725 timediff.tv_nsec / NSEC_PER_USEC;
1726 arrived = timespec64_sub(work_end, request->rq_arrival_time);
1727 arrived_usecs = arrived.tv_sec * USEC_PER_SEC +
1728 arrived.tv_nsec / NSEC_PER_USEC;
1729 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d Request processed in %ldus (%ldus total) trans %llu rc %d/%d\n",
1731 (request->rq_export ?
1732 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1733 (request->rq_export ?
1734 atomic_read(&request->rq_export->exp_refcount) : -99),
1735 lustre_msg_get_status(request->rq_reqmsg),
1737 libcfs_id2str(request->rq_peer),
1738 lustre_msg_get_opc(request->rq_reqmsg),
1741 (request->rq_repmsg ?
1742 lustre_msg_get_transno(request->rq_repmsg) :
1743 request->rq_transno),
1745 (request->rq_repmsg ?
1746 lustre_msg_get_status(request->rq_repmsg) : -999));
1747 if (likely(svc->srv_stats && request->rq_reqmsg)) {
1748 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
1749 int opc = opcode_offset(op);
1751 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
1752 LASSERT(opc < LUSTRE_MAX_OPCODES);
1753 lprocfs_counter_add(svc->srv_stats,
1754 opc + EXTRA_MAX_OPCODES,
1758 if (unlikely(request->rq_early_count)) {
1759 DEBUG_REQ(D_ADAPTTO, request,
1760 "sent %d early replies before finishing in %llds",
1761 request->rq_early_count,
1762 (s64)work_end.tv_sec -
1763 request->rq_arrival_time.tv_sec);
1766 ptlrpc_server_finish_active_request(svcpt, request);
1772 * An internal function to process a single reply state object.
1775 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
1777 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
1778 struct ptlrpc_service *svc = svcpt->scp_service;
1779 struct obd_export *exp;
1783 exp = rs->rs_export;
1785 LASSERT(rs->rs_difficult);
1786 LASSERT(rs->rs_scheduled);
1787 LASSERT(list_empty(&rs->rs_list));
1789 spin_lock(&exp->exp_lock);
1790 /* Noop if removed already */
1791 list_del_init(&rs->rs_exp_list);
1792 spin_unlock(&exp->exp_lock);
1794 /* The disk commit callback holds exp_uncommitted_replies_lock while it
1795 * iterates over newly committed replies, removing them from
1796 * exp_uncommitted_replies. It then drops this lock and schedules the
1797 * replies it found for handling here.
1799 * We can avoid contention for exp_uncommitted_replies_lock between the
1800 * HRT threads and further commit callbacks by checking rs_committed
1801 * which is set in the commit callback while it holds both
1802 * rs_lock and exp_uncommitted_reples.
1804 * If we see rs_committed clear, the commit callback _may_ not have
1805 * handled this reply yet and we race with it to grab
1806 * exp_uncommitted_replies_lock before removing the reply from
1807 * exp_uncommitted_replies. Note that if we lose the race and the
1808 * reply has already been removed, list_del_init() is a noop.
1810 * If we see rs_committed set, we know the commit callback is handling,
1811 * or has handled this reply since store reordering might allow us to
1812 * see rs_committed set out of sequence. But since this is done
1813 * holding rs_lock, we can be sure it has all completed once we hold
1814 * rs_lock, which we do right next.
1816 if (!rs->rs_committed) {
1817 spin_lock(&exp->exp_uncommitted_replies_lock);
1818 list_del_init(&rs->rs_obd_list);
1819 spin_unlock(&exp->exp_uncommitted_replies_lock);
1822 spin_lock(&rs->rs_lock);
1824 been_handled = rs->rs_handled;
1827 nlocks = rs->rs_nlocks; /* atomic "steal", but */
1828 rs->rs_nlocks = 0; /* locks still on rs_locks! */
1830 if (nlocks == 0 && !been_handled) {
1831 /* If we see this, we should already have seen the warning
1832 * in mds_steal_ack_locks()
1834 CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
1836 rs->rs_xid, rs->rs_transno, rs->rs_opc,
1837 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1840 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
1841 spin_unlock(&rs->rs_lock);
1843 if (!been_handled && rs->rs_on_net) {
1844 LNetMDUnlink(rs->rs_md_h);
1845 /* Ignore return code; we're racing with completion */
1848 while (nlocks-- > 0)
1849 ldlm_lock_decref(&rs->rs_locks[nlocks],
1850 rs->rs_modes[nlocks]);
1852 spin_lock(&rs->rs_lock);
1855 rs->rs_scheduled = 0;
1857 if (!rs->rs_on_net) {
1859 spin_unlock(&rs->rs_lock);
1861 class_export_put(exp);
1862 rs->rs_export = NULL;
1863 ptlrpc_rs_decref(rs);
1864 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
1865 svc->srv_is_stopping)
1866 wake_up_all(&svcpt->scp_waitq);
1870 /* still on the net; callback will schedule */
1871 spin_unlock(&rs->rs_lock);
1876 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
1878 int avail = svcpt->scp_nrqbds_posted;
1879 int low_water = test_req_buffer_pressure ? 0 :
1880 svcpt->scp_service->srv_nbuf_per_group / 2;
1882 /* NB I'm not locking; just looking. */
1884 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
1885 * allowed the request history to grow out of control. We could put a
1886 * sanity check on that here and cull some history if we need the
1890 if (avail <= low_water)
1891 ptlrpc_grow_req_bufs(svcpt, 1);
1893 if (svcpt->scp_service->srv_stats) {
1894 lprocfs_counter_add(svcpt->scp_service->srv_stats,
1895 PTLRPC_REQBUF_AVAIL_CNTR, avail);
1900 ptlrpc_retry_rqbds(void *arg)
1902 struct ptlrpc_service_part *svcpt = arg;
1904 svcpt->scp_rqbd_timeout = 0;
1909 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
1911 return svcpt->scp_nreqs_active <
1912 svcpt->scp_nthrs_running - 1 -
1913 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
1917 * allowed to create more threads
1918 * user can call it w/o any lock but need to hold
1919 * ptlrpc_service_part::scp_lock to get reliable result
1922 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
1924 return svcpt->scp_nthrs_running +
1925 svcpt->scp_nthrs_starting <
1926 svcpt->scp_service->srv_nthrs_cpt_limit;
1930 * too many requests and allowed to create more threads
1933 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
1935 return !ptlrpc_threads_enough(svcpt) &&
1936 ptlrpc_threads_increasable(svcpt);
1940 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
1942 return thread_is_stopping(thread) ||
1943 thread->t_svcpt->scp_service->srv_is_stopping;
1947 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
1949 return !list_empty(&svcpt->scp_rqbd_idle) &&
1950 svcpt->scp_rqbd_timeout == 0;
1954 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
1956 return svcpt->scp_at_check;
1960 * requests wait on preprocessing
1961 * user can call it w/o any lock but need to hold
1962 * ptlrpc_service_part::scp_lock to get reliable result
1965 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
1967 return !list_empty(&svcpt->scp_req_incoming);
1970 static __attribute__((__noinline__)) int
1971 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
1972 struct ptlrpc_thread *thread)
1974 /* Don't exit while there are replies to be handled */
1975 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
1976 ptlrpc_retry_rqbds, svcpt);
1978 /* XXX: Add this back when libcfs watchdog is merged upstream
1979 lc_watchdog_disable(thread->t_watchdog);
1984 l_wait_event_exclusive_head(svcpt->scp_waitq,
1985 ptlrpc_thread_stopping(thread) ||
1986 ptlrpc_server_request_incoming(svcpt) ||
1987 ptlrpc_server_request_pending(svcpt, false) ||
1988 ptlrpc_rqbd_pending(svcpt) ||
1989 ptlrpc_at_check(svcpt), &lwi);
1991 if (ptlrpc_thread_stopping(thread))
1995 lc_watchdog_touch(thread->t_watchdog,
1996 ptlrpc_server_get_timeout(svcpt));
2002 * Main thread body for service threads.
2003 * Waits in a loop waiting for new requests to process to appear.
2004 * Every time an incoming requests is added to its queue, a waitq
2005 * is woken up and one of the threads will handle it.
2007 static int ptlrpc_main(void *arg)
2009 struct ptlrpc_thread *thread = arg;
2010 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2011 struct ptlrpc_service *svc = svcpt->scp_service;
2012 struct ptlrpc_reply_state *rs;
2013 struct group_info *ginfo = NULL;
2015 int counter = 0, rc = 0;
2017 thread->t_pid = current_pid();
2018 unshare_fs_struct();
2020 /* NB: we will call cfs_cpt_bind() for all threads, because we
2021 * might want to run lustre server only on a subset of system CPUs,
2022 * in that case ->scp_cpt is CFS_CPT_ANY
2024 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2026 CWARN("%s: failed to bind %s on CPT %d\n",
2027 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2030 ginfo = groups_alloc(0);
2036 set_current_groups(ginfo);
2037 put_group_info(ginfo);
2039 if (svc->srv_ops.so_thr_init) {
2040 rc = svc->srv_ops.so_thr_init(thread);
2045 env = kzalloc(sizeof(*env), GFP_NOFS);
2051 rc = lu_context_init(&env->le_ctx,
2052 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2056 thread->t_env = env;
2057 env->le_ctx.lc_thread = thread;
2058 env->le_ctx.lc_cookie = 0x6;
2060 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2061 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2065 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2066 svc->srv_name, svcpt->scp_cpt, rc);
2070 /* Alloc reply state structure for this one */
2071 rs = libcfs_kvzalloc(svc->srv_max_reply_size, GFP_NOFS);
2077 spin_lock(&svcpt->scp_lock);
2079 LASSERT(thread_is_starting(thread));
2080 thread_clear_flags(thread, SVC_STARTING);
2082 LASSERT(svcpt->scp_nthrs_starting == 1);
2083 svcpt->scp_nthrs_starting--;
2085 /* SVC_STOPPING may already be set here if someone else is trying
2086 * to stop the service while this new thread has been dynamically
2087 * forked. We still set SVC_RUNNING to let our creator know that
2088 * we are now running, however we will exit as soon as possible
2090 thread_add_flags(thread, SVC_RUNNING);
2091 svcpt->scp_nthrs_running++;
2092 spin_unlock(&svcpt->scp_lock);
2094 /* wake up our creator in case he's still waiting. */
2095 wake_up(&thread->t_ctl_waitq);
2098 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2102 spin_lock(&svcpt->scp_rep_lock);
2103 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2104 wake_up(&svcpt->scp_rep_waitq);
2105 spin_unlock(&svcpt->scp_rep_lock);
2107 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2108 svcpt->scp_nthrs_running);
2110 /* XXX maintain a list of all managed devices: insert here */
2111 while (!ptlrpc_thread_stopping(thread)) {
2112 if (ptlrpc_wait_event(svcpt, thread))
2115 ptlrpc_check_rqbd_pool(svcpt);
2117 if (ptlrpc_threads_need_create(svcpt)) {
2118 /* Ignore return code - we tried... */
2119 ptlrpc_start_thread(svcpt, 0);
2122 /* Process all incoming reqs before handling any */
2123 if (ptlrpc_server_request_incoming(svcpt)) {
2124 lu_context_enter(&env->le_ctx);
2126 ptlrpc_server_handle_req_in(svcpt, thread);
2127 lu_context_exit(&env->le_ctx);
2129 /* but limit ourselves in case of flood */
2130 if (counter++ < 100)
2135 if (ptlrpc_at_check(svcpt))
2136 ptlrpc_at_check_timed(svcpt);
2138 if (ptlrpc_server_request_pending(svcpt, false)) {
2139 lu_context_enter(&env->le_ctx);
2140 ptlrpc_server_handle_request(svcpt, thread);
2141 lu_context_exit(&env->le_ctx);
2144 if (ptlrpc_rqbd_pending(svcpt) &&
2145 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2146 /* I just failed to repost request buffers.
2147 * Wait for a timeout (unless something else
2148 * happens) before I try again
2150 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2151 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2152 svcpt->scp_nrqbds_posted);
2157 lc_watchdog_delete(thread->t_watchdog);
2158 thread->t_watchdog = NULL;
2163 * deconstruct service specific state created by ptlrpc_start_thread()
2165 if (svc->srv_ops.so_thr_done)
2166 svc->srv_ops.so_thr_done(thread);
2169 lu_context_fini(&env->le_ctx);
2173 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2174 thread, thread->t_pid, thread->t_id, rc);
2176 spin_lock(&svcpt->scp_lock);
2177 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2178 svcpt->scp_nthrs_starting--;
2180 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2181 /* must know immediately */
2182 svcpt->scp_nthrs_running--;
2186 thread_add_flags(thread, SVC_STOPPED);
2188 wake_up(&thread->t_ctl_waitq);
2189 spin_unlock(&svcpt->scp_lock);
2194 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2195 struct list_head *replies)
2199 spin_lock(&hrt->hrt_lock);
2201 list_splice_init(&hrt->hrt_queue, replies);
2202 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2204 spin_unlock(&hrt->hrt_lock);
2209 * Main body of "handle reply" function.
2210 * It processes acked reply states
2212 static int ptlrpc_hr_main(void *arg)
2214 struct ptlrpc_hr_thread *hrt = arg;
2215 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2217 char threadname[20];
2220 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2221 hrp->hrp_cpt, hrt->hrt_id);
2222 unshare_fs_struct();
2224 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2226 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2227 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2230 atomic_inc(&hrp->hrp_nstarted);
2231 wake_up(&ptlrpc_hr.hr_waitq);
2233 while (!ptlrpc_hr.hr_stopping) {
2234 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2236 while (!list_empty(&replies)) {
2237 struct ptlrpc_reply_state *rs;
2239 rs = list_entry(replies.prev, struct ptlrpc_reply_state,
2241 list_del_init(&rs->rs_list);
2242 ptlrpc_handle_rs(rs);
2246 atomic_inc(&hrp->hrp_nstopped);
2247 wake_up(&ptlrpc_hr.hr_waitq);
2252 static void ptlrpc_stop_hr_threads(void)
2254 struct ptlrpc_hr_partition *hrp;
2258 ptlrpc_hr.hr_stopping = 1;
2260 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2262 continue; /* uninitialized */
2263 for (j = 0; j < hrp->hrp_nthrs; j++)
2264 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2267 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2269 continue; /* uninitialized */
2270 wait_event(ptlrpc_hr.hr_waitq,
2271 atomic_read(&hrp->hrp_nstopped) ==
2272 atomic_read(&hrp->hrp_nstarted));
2276 static int ptlrpc_start_hr_threads(void)
2278 struct ptlrpc_hr_partition *hrp;
2282 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2285 for (j = 0; j < hrp->hrp_nthrs; j++) {
2286 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2287 struct task_struct *task;
2289 task = kthread_run(ptlrpc_hr_main,
2291 "ptlrpc_hr%02d_%03d",
2292 hrp->hrp_cpt, hrt->hrt_id);
2298 wait_event(ptlrpc_hr.hr_waitq,
2299 atomic_read(&hrp->hrp_nstarted) == j);
2302 CERROR("cannot start reply handler thread %d:%d: rc = %d\n",
2304 ptlrpc_stop_hr_threads();
2311 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2313 struct l_wait_info lwi = { 0 };
2314 struct ptlrpc_thread *thread;
2317 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2318 svcpt->scp_service->srv_name);
2320 spin_lock(&svcpt->scp_lock);
2321 /* let the thread know that we would like it to stop asap */
2322 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2323 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2324 svcpt->scp_service->srv_thread_name, thread->t_id);
2325 thread_add_flags(thread, SVC_STOPPING);
2328 wake_up_all(&svcpt->scp_waitq);
2330 while (!list_empty(&svcpt->scp_threads)) {
2331 thread = list_entry(svcpt->scp_threads.next,
2332 struct ptlrpc_thread, t_link);
2333 if (thread_is_stopped(thread)) {
2334 list_del(&thread->t_link);
2335 list_add(&thread->t_link, &zombie);
2338 spin_unlock(&svcpt->scp_lock);
2340 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2341 svcpt->scp_service->srv_thread_name, thread->t_id);
2342 l_wait_event(thread->t_ctl_waitq,
2343 thread_is_stopped(thread), &lwi);
2345 spin_lock(&svcpt->scp_lock);
2348 spin_unlock(&svcpt->scp_lock);
2350 while (!list_empty(&zombie)) {
2351 thread = list_entry(zombie.next,
2352 struct ptlrpc_thread, t_link);
2353 list_del(&thread->t_link);
2359 * Stops all threads of a particular service \a svc
2361 static void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2363 struct ptlrpc_service_part *svcpt;
2366 ptlrpc_service_for_each_part(svcpt, i, svc) {
2367 if (svcpt->scp_service)
2368 ptlrpc_svcpt_stop_threads(svcpt);
2372 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2378 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2379 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2381 for (i = 0; i < svc->srv_ncpts; i++) {
2382 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2383 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2389 /* We have enough threads, don't start more. b=15759 */
2396 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2397 svc->srv_thread_name, i, j, rc);
2398 ptlrpc_stop_all_threads(svc);
2401 EXPORT_SYMBOL(ptlrpc_start_threads);
2403 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2405 struct l_wait_info lwi = { 0 };
2406 struct ptlrpc_thread *thread;
2407 struct ptlrpc_service *svc;
2408 struct task_struct *task;
2411 svc = svcpt->scp_service;
2413 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2414 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2415 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2418 if (unlikely(svc->srv_is_stopping))
2421 if (!ptlrpc_threads_increasable(svcpt) ||
2422 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2423 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2426 thread = kzalloc_node(sizeof(*thread), GFP_NOFS,
2427 cfs_cpt_spread_node(svc->srv_cptable,
2431 init_waitqueue_head(&thread->t_ctl_waitq);
2433 spin_lock(&svcpt->scp_lock);
2434 if (!ptlrpc_threads_increasable(svcpt)) {
2435 spin_unlock(&svcpt->scp_lock);
2440 if (svcpt->scp_nthrs_starting != 0) {
2441 /* serialize starting because some modules (obdfilter)
2442 * might require unique and contiguous t_id
2444 LASSERT(svcpt->scp_nthrs_starting == 1);
2445 spin_unlock(&svcpt->scp_lock);
2448 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2449 svc->srv_thread_name, svcpt->scp_thr_nextid);
2454 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2455 svc->srv_thread_name, svcpt->scp_thr_nextid);
2459 svcpt->scp_nthrs_starting++;
2460 thread->t_id = svcpt->scp_thr_nextid++;
2461 thread_add_flags(thread, SVC_STARTING);
2462 thread->t_svcpt = svcpt;
2464 list_add(&thread->t_link, &svcpt->scp_threads);
2465 spin_unlock(&svcpt->scp_lock);
2467 if (svcpt->scp_cpt >= 0) {
2468 snprintf(thread->t_name, sizeof(thread->t_name), "%s%02d_%03d",
2469 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2471 snprintf(thread->t_name, sizeof(thread->t_name), "%s_%04d",
2472 svc->srv_thread_name, thread->t_id);
2475 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2476 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
2479 CERROR("cannot start thread '%s': rc = %d\n",
2480 thread->t_name, rc);
2481 spin_lock(&svcpt->scp_lock);
2482 --svcpt->scp_nthrs_starting;
2483 if (thread_is_stopping(thread)) {
2484 /* this ptlrpc_thread is being handled
2485 * by ptlrpc_svcpt_stop_threads now
2487 thread_add_flags(thread, SVC_STOPPED);
2488 wake_up(&thread->t_ctl_waitq);
2489 spin_unlock(&svcpt->scp_lock);
2491 list_del(&thread->t_link);
2492 spin_unlock(&svcpt->scp_lock);
2501 l_wait_event(thread->t_ctl_waitq,
2502 thread_is_running(thread) || thread_is_stopped(thread),
2505 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2509 int ptlrpc_hr_init(void)
2511 struct ptlrpc_hr_partition *hrp;
2512 struct ptlrpc_hr_thread *hrt;
2518 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2519 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2521 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2523 if (!ptlrpc_hr.hr_partitions)
2526 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2528 weight = cpumask_weight(topology_sibling_cpumask(0));
2530 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2533 atomic_set(&hrp->hrp_nstarted, 0);
2534 atomic_set(&hrp->hrp_nstopped, 0);
2536 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
2537 hrp->hrp_nthrs /= weight;
2539 LASSERT(hrp->hrp_nthrs > 0);
2541 kzalloc_node(hrp->hrp_nthrs * sizeof(*hrt), GFP_NOFS,
2542 cfs_cpt_spread_node(ptlrpc_hr.hr_cpt_table,
2544 if (!hrp->hrp_thrs) {
2549 for (j = 0; j < hrp->hrp_nthrs; j++) {
2550 hrt = &hrp->hrp_thrs[j];
2553 hrt->hrt_partition = hrp;
2554 init_waitqueue_head(&hrt->hrt_waitq);
2555 spin_lock_init(&hrt->hrt_lock);
2556 INIT_LIST_HEAD(&hrt->hrt_queue);
2560 rc = ptlrpc_start_hr_threads();
2567 void ptlrpc_hr_fini(void)
2569 struct ptlrpc_hr_partition *hrp;
2572 if (!ptlrpc_hr.hr_partitions)
2575 ptlrpc_stop_hr_threads();
2577 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2578 kfree(hrp->hrp_thrs);
2581 cfs_percpt_free(ptlrpc_hr.hr_partitions);
2582 ptlrpc_hr.hr_partitions = NULL;
2586 * Wait until all already scheduled replies are processed.
2588 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
2592 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2595 rc = l_wait_event(svcpt->scp_waitq,
2596 atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
2599 CWARN("Unexpectedly long timeout %s %p\n",
2600 svcpt->scp_service->srv_name, svcpt->scp_service);
2605 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
2607 struct ptlrpc_service_part *svcpt;
2610 /* early disarm AT timer... */
2611 ptlrpc_service_for_each_part(svcpt, i, svc) {
2612 if (svcpt->scp_service)
2613 del_timer(&svcpt->scp_at_timer);
2618 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
2620 struct ptlrpc_service_part *svcpt;
2621 struct ptlrpc_request_buffer_desc *rqbd;
2622 struct l_wait_info lwi;
2626 /* All history will be culled when the next request buffer is
2627 * freed in ptlrpc_service_purge_all()
2629 svc->srv_hist_nrqbds_cpt_max = 0;
2631 rc = LNetClearLazyPortal(svc->srv_req_portal);
2634 ptlrpc_service_for_each_part(svcpt, i, svc) {
2635 if (!svcpt->scp_service)
2638 /* Unlink all the request buffers. This forces a 'final'
2639 * event with its 'unlink' flag set for each posted rqbd
2641 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
2643 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2644 LASSERT(rc == 0 || rc == -ENOENT);
2648 ptlrpc_service_for_each_part(svcpt, i, svc) {
2649 if (!svcpt->scp_service)
2652 /* Wait for the network to release any buffers
2653 * it's currently filling
2655 spin_lock(&svcpt->scp_lock);
2656 while (svcpt->scp_nrqbds_posted != 0) {
2657 spin_unlock(&svcpt->scp_lock);
2658 /* Network access will complete in finite time but
2659 * the HUGE timeout lets us CWARN for visibility
2662 lwi = LWI_TIMEOUT_INTERVAL(
2663 cfs_time_seconds(LONG_UNLINK),
2664 cfs_time_seconds(1), NULL, NULL);
2665 rc = l_wait_event(svcpt->scp_waitq,
2666 svcpt->scp_nrqbds_posted == 0, &lwi);
2667 if (rc == -ETIMEDOUT) {
2668 CWARN("Service %s waiting for request buffers\n",
2669 svcpt->scp_service->srv_name);
2671 spin_lock(&svcpt->scp_lock);
2673 spin_unlock(&svcpt->scp_lock);
2678 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
2680 struct ptlrpc_service_part *svcpt;
2681 struct ptlrpc_request_buffer_desc *rqbd;
2682 struct ptlrpc_request *req;
2683 struct ptlrpc_reply_state *rs;
2686 ptlrpc_service_for_each_part(svcpt, i, svc) {
2687 if (!svcpt->scp_service)
2690 spin_lock(&svcpt->scp_rep_lock);
2691 while (!list_empty(&svcpt->scp_rep_active)) {
2692 rs = list_entry(svcpt->scp_rep_active.next,
2693 struct ptlrpc_reply_state, rs_list);
2694 spin_lock(&rs->rs_lock);
2695 ptlrpc_schedule_difficult_reply(rs);
2696 spin_unlock(&rs->rs_lock);
2698 spin_unlock(&svcpt->scp_rep_lock);
2700 /* purge the request queue. NB No new replies (rqbds
2701 * all unlinked) and no service threads, so I'm the only
2702 * thread noodling the request queue now
2704 while (!list_empty(&svcpt->scp_req_incoming)) {
2705 req = list_entry(svcpt->scp_req_incoming.next,
2706 struct ptlrpc_request, rq_list);
2708 list_del(&req->rq_list);
2709 svcpt->scp_nreqs_incoming--;
2710 ptlrpc_server_finish_request(svcpt, req);
2713 while (ptlrpc_server_request_pending(svcpt, true)) {
2714 req = ptlrpc_server_request_get(svcpt, true);
2715 ptlrpc_server_finish_active_request(svcpt, req);
2718 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
2719 LASSERT(svcpt->scp_nreqs_incoming == 0);
2720 LASSERT(svcpt->scp_nreqs_active == 0);
2721 /* history should have been culled by
2722 * ptlrpc_server_finish_request
2724 LASSERT(svcpt->scp_hist_nrqbds == 0);
2726 /* Now free all the request buffers since nothing
2727 * references them any more...
2730 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2731 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
2732 struct ptlrpc_request_buffer_desc,
2734 ptlrpc_free_rqbd(rqbd);
2736 ptlrpc_wait_replies(svcpt);
2738 while (!list_empty(&svcpt->scp_rep_idle)) {
2739 rs = list_entry(svcpt->scp_rep_idle.next,
2740 struct ptlrpc_reply_state,
2742 list_del(&rs->rs_list);
2749 ptlrpc_service_free(struct ptlrpc_service *svc)
2751 struct ptlrpc_service_part *svcpt;
2752 struct ptlrpc_at_array *array;
2755 ptlrpc_service_for_each_part(svcpt, i, svc) {
2756 if (!svcpt->scp_service)
2759 /* In case somebody rearmed this in the meantime */
2760 del_timer(&svcpt->scp_at_timer);
2761 array = &svcpt->scp_at_array;
2763 kfree(array->paa_reqs_array);
2764 array->paa_reqs_array = NULL;
2765 kfree(array->paa_reqs_count);
2766 array->paa_reqs_count = NULL;
2769 ptlrpc_service_for_each_part(svcpt, i, svc)
2773 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
2778 int ptlrpc_unregister_service(struct ptlrpc_service *service)
2780 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
2782 service->srv_is_stopping = 1;
2784 mutex_lock(&ptlrpc_all_services_mutex);
2785 list_del_init(&service->srv_list);
2786 mutex_unlock(&ptlrpc_all_services_mutex);
2788 ptlrpc_service_del_atimer(service);
2789 ptlrpc_stop_all_threads(service);
2791 ptlrpc_service_unlink_rqbd(service);
2792 ptlrpc_service_purge_all(service);
2793 ptlrpc_service_nrs_cleanup(service);
2795 ptlrpc_lprocfs_unregister_service(service);
2796 ptlrpc_sysfs_unregister_service(service);
2798 ptlrpc_service_free(service);
2802 EXPORT_SYMBOL(ptlrpc_unregister_service);