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]--;
1009 * Attempt to extend the request deadline by sending an early reply to the
1012 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
1014 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1015 struct ptlrpc_request *reqcopy;
1016 struct lustre_msg *reqmsg;
1017 long olddl = req->rq_deadline - ktime_get_real_seconds();
1021 /* deadline is when the client expects us to reply, margin is the
1022 * difference between clients' and servers' expectations
1024 DEBUG_REQ(D_ADAPTTO, req,
1025 "%ssending early reply (deadline %+lds, margin %+lds) for %d+%d",
1026 AT_OFF ? "AT off - not " : "",
1027 olddl, olddl - at_get(&svcpt->scp_at_estimate),
1028 at_get(&svcpt->scp_at_estimate), at_extra);
1034 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), not sending early reply. Consider increasing at_early_margin (%d)?",
1035 olddl, at_early_margin);
1037 /* Return an error so we're not re-added to the timed list. */
1041 if (!(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) {
1042 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, but no AT support");
1047 * We want to extend the request deadline by at_extra seconds,
1048 * so we set our service estimate to reflect how much time has
1049 * passed since this request arrived plus an additional
1050 * at_extra seconds. The client will calculate the new deadline
1051 * based on this service estimate (plus some additional time to
1052 * account for network latency). See ptlrpc_at_recv_early_reply
1054 at_measured(&svcpt->scp_at_estimate, at_extra +
1055 ktime_get_real_seconds() - req->rq_arrival_time.tv_sec);
1056 newdl = req->rq_arrival_time.tv_sec + at_get(&svcpt->scp_at_estimate);
1058 /* Check to see if we've actually increased the deadline -
1059 * we may be past adaptive_max
1061 if (req->rq_deadline >= newdl) {
1062 DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%ld/%lld), not sending early reply\n",
1063 olddl, newdl - ktime_get_real_seconds());
1067 reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
1070 reqmsg = libcfs_kvzalloc(req->rq_reqlen, GFP_NOFS);
1077 reqcopy->rq_reply_state = NULL;
1078 reqcopy->rq_rep_swab_mask = 0;
1079 reqcopy->rq_pack_bulk = 0;
1080 reqcopy->rq_pack_udesc = 0;
1081 reqcopy->rq_packed_final = 0;
1082 sptlrpc_svc_ctx_addref(reqcopy);
1083 /* We only need the reqmsg for the magic */
1084 reqcopy->rq_reqmsg = reqmsg;
1085 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1087 LASSERT(atomic_read(&req->rq_refcount));
1088 /** if it is last refcount then early reply isn't needed */
1089 if (atomic_read(&req->rq_refcount) == 1) {
1090 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, abort sending early reply\n");
1095 /* Connection ref */
1096 reqcopy->rq_export = class_conn2export(
1097 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1098 if (!reqcopy->rq_export) {
1104 class_export_rpc_inc(reqcopy->rq_export);
1105 if (reqcopy->rq_export->exp_obd &&
1106 reqcopy->rq_export->exp_obd->obd_fail) {
1111 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1115 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1118 /* Adjust our own deadline to what we told the client */
1119 req->rq_deadline = newdl;
1120 req->rq_early_count++; /* number sent, server side */
1122 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1125 /* Free the (early) reply state from lustre_pack_reply.
1126 * (ptlrpc_send_reply takes it's own rs ref, so this is safe here)
1128 ptlrpc_req_drop_rs(reqcopy);
1131 class_export_rpc_dec(reqcopy->rq_export);
1132 class_export_put(reqcopy->rq_export);
1134 sptlrpc_svc_ctx_decref(reqcopy);
1137 ptlrpc_request_cache_free(reqcopy);
1141 /* Send early replies to everybody expiring within at_early_margin
1142 * asking for at_extra time
1144 static void ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
1146 struct ptlrpc_at_array *array = &svcpt->scp_at_array;
1147 struct ptlrpc_request *rq, *n;
1148 struct list_head work_list;
1151 time64_t now = ktime_get_real_seconds();
1153 int first, counter = 0;
1155 spin_lock(&svcpt->scp_at_lock);
1156 if (svcpt->scp_at_check == 0) {
1157 spin_unlock(&svcpt->scp_at_lock);
1160 delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
1161 svcpt->scp_at_check = 0;
1163 if (array->paa_count == 0) {
1164 spin_unlock(&svcpt->scp_at_lock);
1168 /* The timer went off, but maybe the nearest rpc already completed. */
1169 first = array->paa_deadline - now;
1170 if (first > at_early_margin) {
1171 /* We've still got plenty of time. Reset the timer. */
1172 ptlrpc_at_set_timer(svcpt);
1173 spin_unlock(&svcpt->scp_at_lock);
1177 /* We're close to a timeout, and we don't know how much longer the
1178 * server will take. Send early replies to everyone expiring soon.
1180 INIT_LIST_HEAD(&work_list);
1182 div_u64_rem(array->paa_deadline, array->paa_size, &index);
1183 count = array->paa_count;
1185 count -= array->paa_reqs_count[index];
1186 list_for_each_entry_safe(rq, n, &array->paa_reqs_array[index],
1188 if (rq->rq_deadline > now + at_early_margin) {
1189 /* update the earliest deadline */
1190 if (deadline == -1 ||
1191 rq->rq_deadline < deadline)
1192 deadline = rq->rq_deadline;
1196 ptlrpc_at_remove_timed(rq);
1198 * ptlrpc_server_drop_request() may drop
1199 * refcount to 0 already. Let's check this and
1200 * don't add entry to work_list
1202 if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
1203 list_add(&rq->rq_timed_list, &work_list);
1207 if (++index >= array->paa_size)
1210 array->paa_deadline = deadline;
1211 /* we have a new earliest deadline, restart the timer */
1212 ptlrpc_at_set_timer(svcpt);
1214 spin_unlock(&svcpt->scp_at_lock);
1216 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early replies\n",
1217 first, at_extra, counter);
1219 /* We're already past request deadlines before we even get a
1220 * chance to send early replies
1222 LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
1223 svcpt->scp_service->srv_name);
1224 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%ld(jiff)\n",
1225 counter, svcpt->scp_nreqs_incoming,
1226 svcpt->scp_nreqs_active,
1227 at_get(&svcpt->scp_at_estimate), delay);
1230 /* we took additional refcount so entries can't be deleted from list, no
1233 while (!list_empty(&work_list)) {
1234 rq = list_entry(work_list.next, struct ptlrpc_request,
1236 list_del_init(&rq->rq_timed_list);
1238 if (ptlrpc_at_send_early_reply(rq) == 0)
1239 ptlrpc_at_add_timed(rq);
1241 ptlrpc_server_drop_request(rq);
1246 * Put the request to the export list if the request may become
1247 * a high priority one.
1249 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
1250 struct ptlrpc_request *req)
1254 if (svcpt->scp_service->srv_ops.so_hpreq_handler) {
1255 rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
1260 if (req->rq_export && req->rq_ops) {
1261 /* Perform request specific check. We should do this check
1262 * before the request is added into exp_hp_rpcs list otherwise
1263 * it may hit swab race at LU-1044.
1265 if (req->rq_ops->hpreq_check) {
1266 rc = req->rq_ops->hpreq_check(req);
1268 * XXX: Out of all current
1269 * ptlrpc_hpreq_ops::hpreq_check(), only
1270 * ldlm_cancel_hpreq_check() can return an error code;
1271 * other functions assert in similar places, which seems
1272 * odd. What also does not seem right is that handlers
1273 * for those RPCs do not assert on the same checks, but
1274 * rather handle the error cases. e.g. see
1275 * ost_rw_hpreq_check(), and ost_brw_read(),
1280 LASSERT(rc == 0 || rc == 1);
1283 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1284 list_add(&req->rq_exp_list, &req->rq_export->exp_hp_rpcs);
1285 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1288 ptlrpc_nrs_req_initialize(svcpt, req, rc);
1293 /** Remove the request from the export list. */
1294 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1296 if (req->rq_export && req->rq_ops) {
1297 /* refresh lock timeout again so that client has more
1298 * room to send lock cancel RPC.
1300 if (req->rq_ops->hpreq_fini)
1301 req->rq_ops->hpreq_fini(req);
1303 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1304 list_del_init(&req->rq_exp_list);
1305 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1309 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1310 struct ptlrpc_request *req)
1314 rc = ptlrpc_server_hpreq_init(svcpt, req);
1318 ptlrpc_nrs_req_add(svcpt, req, !!rc);
1324 * Allow to handle high priority request
1325 * User can call it w/o any lock but need to hold
1326 * ptlrpc_service_part::scp_req_lock to get reliable result
1328 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1331 int running = svcpt->scp_nthrs_running;
1333 if (!nrs_svcpt_has_hp(svcpt))
1339 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1340 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1341 /* leave just 1 thread for normal RPCs */
1342 running = PTLRPC_NTHRS_INIT;
1343 if (svcpt->scp_service->srv_ops.so_hpreq_handler)
1347 if (svcpt->scp_nreqs_active >= running - 1)
1350 if (svcpt->scp_nhreqs_active == 0)
1353 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1354 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1357 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1360 return ptlrpc_server_allow_high(svcpt, force) &&
1361 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1365 * Only allow normal priority requests on a service that has a high-priority
1366 * queue if forced (i.e. cleanup), if there are other high priority requests
1367 * already being processed (i.e. those threads can service more high-priority
1368 * requests), or if there are enough idle threads that a later thread can do
1369 * a high priority request.
1370 * User can call it w/o any lock but need to hold
1371 * ptlrpc_service_part::scp_req_lock to get reliable result
1373 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1376 int running = svcpt->scp_nthrs_running;
1378 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1379 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1380 /* leave just 1 thread for normal RPCs */
1381 running = PTLRPC_NTHRS_INIT;
1382 if (svcpt->scp_service->srv_ops.so_hpreq_handler)
1387 svcpt->scp_nreqs_active < running - 2)
1390 if (svcpt->scp_nreqs_active >= running - 1)
1393 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1396 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1399 return ptlrpc_server_allow_normal(svcpt, force) &&
1400 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1404 * Returns true if there are requests available in incoming
1405 * request queue for processing and it is allowed to fetch them.
1406 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1407 * to get reliable result
1408 * \see ptlrpc_server_allow_normal
1409 * \see ptlrpc_server_allow high
1412 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1414 return ptlrpc_server_high_pending(svcpt, force) ||
1415 ptlrpc_server_normal_pending(svcpt, force);
1419 * Fetch a request for processing from queue of unprocessed requests.
1420 * Favors high-priority requests.
1421 * Returns a pointer to fetched request.
1423 static struct ptlrpc_request *
1424 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1426 struct ptlrpc_request *req = NULL;
1428 spin_lock(&svcpt->scp_req_lock);
1430 if (ptlrpc_server_high_pending(svcpt, force)) {
1431 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1433 svcpt->scp_hreq_count++;
1438 if (ptlrpc_server_normal_pending(svcpt, force)) {
1439 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1441 svcpt->scp_hreq_count = 0;
1446 spin_unlock(&svcpt->scp_req_lock);
1450 svcpt->scp_nreqs_active++;
1452 svcpt->scp_nhreqs_active++;
1454 spin_unlock(&svcpt->scp_req_lock);
1456 if (likely(req->rq_export))
1457 class_export_rpc_inc(req->rq_export);
1463 * Handle freshly incoming reqs, add to timed early reply list,
1464 * pass on to regular request queue.
1465 * All incoming requests pass through here before getting into
1466 * ptlrpc_server_handle_req later on.
1469 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1470 struct ptlrpc_thread *thread)
1472 struct ptlrpc_service *svc = svcpt->scp_service;
1473 struct ptlrpc_request *req;
1477 spin_lock(&svcpt->scp_lock);
1478 if (list_empty(&svcpt->scp_req_incoming)) {
1479 spin_unlock(&svcpt->scp_lock);
1483 req = list_entry(svcpt->scp_req_incoming.next,
1484 struct ptlrpc_request, rq_list);
1485 list_del_init(&req->rq_list);
1486 svcpt->scp_nreqs_incoming--;
1487 /* Consider this still a "queued" request as far as stats are
1490 spin_unlock(&svcpt->scp_lock);
1492 /* go through security check/transform */
1493 rc = sptlrpc_svc_unwrap_request(req);
1497 case SECSVC_COMPLETE:
1498 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1507 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1508 * redo it wouldn't be harmful.
1510 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1511 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1513 CERROR("error unpacking request: ptl %d from %s x%llu\n",
1514 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1520 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1522 CERROR("error unpacking ptlrpc body: ptl %d from %s x%llu\n",
1523 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1528 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1529 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1530 CERROR("drop incoming rpc opc %u, x%llu\n",
1531 cfs_fail_val, req->rq_xid);
1536 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1537 CERROR("wrong packet type received (type=%u) from %s\n",
1538 lustre_msg_get_type(req->rq_reqmsg),
1539 libcfs_id2str(req->rq_peer));
1543 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1546 req->rq_bulk_write = 1;
1550 case MGS_CONFIG_READ:
1551 req->rq_bulk_read = 1;
1555 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
1557 req->rq_export = class_conn2export(
1558 lustre_msg_get_handle(req->rq_reqmsg));
1559 if (req->rq_export) {
1560 rc = ptlrpc_check_req(req);
1562 rc = sptlrpc_target_export_check(req->rq_export, req);
1564 DEBUG_REQ(D_ERROR, req, "DROPPING req with illegal security flavor,");
1571 /* req_in handling should/must be fast */
1572 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
1573 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1574 (long)(ktime_get_real_seconds() -
1575 req->rq_arrival_time.tv_sec));
1577 /* Set rpc server deadline and add it to the timed list */
1578 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1579 MSGHDR_AT_SUPPORT) ?
1580 /* The max time the client expects us to take */
1581 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1582 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1583 if (unlikely(deadline == 0)) {
1584 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1588 req->rq_svc_thread = thread;
1590 /* initialize request session, it is needed for request
1591 * processing by target
1593 rc = lu_context_init(&req->rq_session,
1594 LCT_SERVER_SESSION | LCT_NOREF);
1596 CERROR("%s: failure to initialize session: rc = %d\n",
1597 thread->t_name, rc);
1600 req->rq_session.lc_thread = thread;
1601 lu_context_enter(&req->rq_session);
1602 req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1605 ptlrpc_at_add_timed(req);
1607 /* Move it over to the request processing queue */
1608 rc = ptlrpc_server_request_add(svcpt, req);
1612 wake_up(&svcpt->scp_waitq);
1616 ptlrpc_server_finish_request(svcpt, req);
1622 * Main incoming request handling logic.
1623 * Calls handler function from service to do actual processing.
1626 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
1627 struct ptlrpc_thread *thread)
1629 struct ptlrpc_service *svc = svcpt->scp_service;
1630 struct ptlrpc_request *request;
1631 struct timespec64 work_start;
1632 struct timespec64 work_end;
1633 struct timespec64 timediff;
1634 struct timespec64 arrived;
1635 unsigned long timediff_usecs;
1636 unsigned long arrived_usecs;
1639 request = ptlrpc_server_request_get(svcpt, false);
1643 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1644 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1645 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1646 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1648 if (unlikely(fail_opc)) {
1649 if (request->rq_export && request->rq_ops)
1650 OBD_FAIL_TIMEOUT(fail_opc, 4);
1653 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1655 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1656 libcfs_debug_dumplog();
1658 ktime_get_real_ts64(&work_start);
1659 timediff = timespec64_sub(work_start, request->rq_arrival_time);
1660 timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
1661 timediff.tv_nsec / NSEC_PER_USEC;
1662 if (likely(svc->srv_stats)) {
1663 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1665 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1666 svcpt->scp_nreqs_incoming);
1667 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1668 svcpt->scp_nreqs_active);
1669 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1670 at_get(&svcpt->scp_at_estimate));
1673 if (likely(request->rq_export)) {
1674 if (unlikely(ptlrpc_check_req(request)))
1678 /* Discard requests queued for longer than the deadline.
1679 * The deadline is increased if we send an early reply.
1681 if (ktime_get_real_seconds() > request->rq_deadline) {
1682 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline " CFS_DURATION_T ":" CFS_DURATION_T "s ago\n",
1683 libcfs_id2str(request->rq_peer),
1684 (long)(request->rq_deadline -
1685 request->rq_arrival_time.tv_sec),
1686 (long)(ktime_get_real_seconds() -
1687 request->rq_deadline));
1691 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d\n",
1693 (request->rq_export ?
1694 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1695 (request->rq_export ?
1696 atomic_read(&request->rq_export->exp_refcount) : -99),
1697 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1698 libcfs_id2str(request->rq_peer),
1699 lustre_msg_get_opc(request->rq_reqmsg));
1701 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1702 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
1704 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
1706 /* re-assign request and sesson thread to the current one */
1707 request->rq_svc_thread = thread;
1709 LASSERT(request->rq_session.lc_thread);
1710 request->rq_session.lc_thread = thread;
1711 request->rq_session.lc_cookie = 0x55;
1712 thread->t_env->le_ses = &request->rq_session;
1714 svc->srv_ops.so_req_handler(request);
1716 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1719 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
1720 DEBUG_REQ(D_WARNING, request,
1721 "Request took longer than estimated (%lld:%llds); "
1722 "client may timeout.",
1723 (s64)request->rq_deadline -
1724 request->rq_arrival_time.tv_sec,
1725 (s64)ktime_get_real_seconds() - request->rq_deadline);
1728 ktime_get_real_ts64(&work_end);
1729 timediff = timespec64_sub(work_end, work_start);
1730 timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
1731 timediff.tv_nsec / NSEC_PER_USEC;
1732 arrived = timespec64_sub(work_end, request->rq_arrival_time);
1733 arrived_usecs = arrived.tv_sec * USEC_PER_SEC +
1734 arrived.tv_nsec / NSEC_PER_USEC;
1735 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",
1737 (request->rq_export ?
1738 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1739 (request->rq_export ?
1740 atomic_read(&request->rq_export->exp_refcount) : -99),
1741 lustre_msg_get_status(request->rq_reqmsg),
1743 libcfs_id2str(request->rq_peer),
1744 lustre_msg_get_opc(request->rq_reqmsg),
1747 (request->rq_repmsg ?
1748 lustre_msg_get_transno(request->rq_repmsg) :
1749 request->rq_transno),
1751 (request->rq_repmsg ?
1752 lustre_msg_get_status(request->rq_repmsg) : -999));
1753 if (likely(svc->srv_stats && request->rq_reqmsg)) {
1754 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
1755 int opc = opcode_offset(op);
1757 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
1758 LASSERT(opc < LUSTRE_MAX_OPCODES);
1759 lprocfs_counter_add(svc->srv_stats,
1760 opc + EXTRA_MAX_OPCODES,
1764 if (unlikely(request->rq_early_count)) {
1765 DEBUG_REQ(D_ADAPTTO, request,
1766 "sent %d early replies before finishing in %llds",
1767 request->rq_early_count,
1768 (s64)work_end.tv_sec -
1769 request->rq_arrival_time.tv_sec);
1772 ptlrpc_server_finish_active_request(svcpt, request);
1778 * An internal function to process a single reply state object.
1781 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
1783 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
1784 struct ptlrpc_service *svc = svcpt->scp_service;
1785 struct obd_export *exp;
1789 exp = rs->rs_export;
1791 LASSERT(rs->rs_difficult);
1792 LASSERT(rs->rs_scheduled);
1793 LASSERT(list_empty(&rs->rs_list));
1795 spin_lock(&exp->exp_lock);
1796 /* Noop if removed already */
1797 list_del_init(&rs->rs_exp_list);
1798 spin_unlock(&exp->exp_lock);
1800 /* The disk commit callback holds exp_uncommitted_replies_lock while it
1801 * iterates over newly committed replies, removing them from
1802 * exp_uncommitted_replies. It then drops this lock and schedules the
1803 * replies it found for handling here.
1805 * We can avoid contention for exp_uncommitted_replies_lock between the
1806 * HRT threads and further commit callbacks by checking rs_committed
1807 * which is set in the commit callback while it holds both
1808 * rs_lock and exp_uncommitted_reples.
1810 * If we see rs_committed clear, the commit callback _may_ not have
1811 * handled this reply yet and we race with it to grab
1812 * exp_uncommitted_replies_lock before removing the reply from
1813 * exp_uncommitted_replies. Note that if we lose the race and the
1814 * reply has already been removed, list_del_init() is a noop.
1816 * If we see rs_committed set, we know the commit callback is handling,
1817 * or has handled this reply since store reordering might allow us to
1818 * see rs_committed set out of sequence. But since this is done
1819 * holding rs_lock, we can be sure it has all completed once we hold
1820 * rs_lock, which we do right next.
1822 if (!rs->rs_committed) {
1823 spin_lock(&exp->exp_uncommitted_replies_lock);
1824 list_del_init(&rs->rs_obd_list);
1825 spin_unlock(&exp->exp_uncommitted_replies_lock);
1828 spin_lock(&rs->rs_lock);
1830 been_handled = rs->rs_handled;
1833 nlocks = rs->rs_nlocks; /* atomic "steal", but */
1834 rs->rs_nlocks = 0; /* locks still on rs_locks! */
1836 if (nlocks == 0 && !been_handled) {
1837 /* If we see this, we should already have seen the warning
1838 * in mds_steal_ack_locks()
1840 CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
1842 rs->rs_xid, rs->rs_transno, rs->rs_opc,
1843 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1846 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
1847 spin_unlock(&rs->rs_lock);
1849 if (!been_handled && rs->rs_on_net) {
1850 LNetMDUnlink(rs->rs_md_h);
1851 /* Ignore return code; we're racing with completion */
1854 while (nlocks-- > 0)
1855 ldlm_lock_decref(&rs->rs_locks[nlocks],
1856 rs->rs_modes[nlocks]);
1858 spin_lock(&rs->rs_lock);
1861 rs->rs_scheduled = 0;
1863 if (!rs->rs_on_net) {
1865 spin_unlock(&rs->rs_lock);
1867 class_export_put(exp);
1868 rs->rs_export = NULL;
1869 ptlrpc_rs_decref(rs);
1870 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
1871 svc->srv_is_stopping)
1872 wake_up_all(&svcpt->scp_waitq);
1876 /* still on the net; callback will schedule */
1877 spin_unlock(&rs->rs_lock);
1882 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
1884 int avail = svcpt->scp_nrqbds_posted;
1885 int low_water = test_req_buffer_pressure ? 0 :
1886 svcpt->scp_service->srv_nbuf_per_group / 2;
1888 /* NB I'm not locking; just looking. */
1890 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
1891 * allowed the request history to grow out of control. We could put a
1892 * sanity check on that here and cull some history if we need the
1896 if (avail <= low_water)
1897 ptlrpc_grow_req_bufs(svcpt, 1);
1899 if (svcpt->scp_service->srv_stats) {
1900 lprocfs_counter_add(svcpt->scp_service->srv_stats,
1901 PTLRPC_REQBUF_AVAIL_CNTR, avail);
1906 ptlrpc_retry_rqbds(void *arg)
1908 struct ptlrpc_service_part *svcpt = arg;
1910 svcpt->scp_rqbd_timeout = 0;
1915 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
1917 return svcpt->scp_nreqs_active <
1918 svcpt->scp_nthrs_running - 1 -
1919 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
1923 * allowed to create more threads
1924 * user can call it w/o any lock but need to hold
1925 * ptlrpc_service_part::scp_lock to get reliable result
1928 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
1930 return svcpt->scp_nthrs_running +
1931 svcpt->scp_nthrs_starting <
1932 svcpt->scp_service->srv_nthrs_cpt_limit;
1936 * too many requests and allowed to create more threads
1939 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
1941 return !ptlrpc_threads_enough(svcpt) &&
1942 ptlrpc_threads_increasable(svcpt);
1946 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
1948 return thread_is_stopping(thread) ||
1949 thread->t_svcpt->scp_service->srv_is_stopping;
1953 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
1955 return !list_empty(&svcpt->scp_rqbd_idle) &&
1956 svcpt->scp_rqbd_timeout == 0;
1960 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
1962 return svcpt->scp_at_check;
1966 * requests wait on preprocessing
1967 * user can call it w/o any lock but need to hold
1968 * ptlrpc_service_part::scp_lock to get reliable result
1971 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
1973 return !list_empty(&svcpt->scp_req_incoming);
1976 static __attribute__((__noinline__)) int
1977 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
1978 struct ptlrpc_thread *thread)
1980 /* Don't exit while there are replies to be handled */
1981 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
1982 ptlrpc_retry_rqbds, svcpt);
1984 /* XXX: Add this back when libcfs watchdog is merged upstream
1985 lc_watchdog_disable(thread->t_watchdog);
1990 l_wait_event_exclusive_head(svcpt->scp_waitq,
1991 ptlrpc_thread_stopping(thread) ||
1992 ptlrpc_server_request_incoming(svcpt) ||
1993 ptlrpc_server_request_pending(svcpt,
1995 ptlrpc_rqbd_pending(svcpt) ||
1996 ptlrpc_at_check(svcpt), &lwi);
1998 if (ptlrpc_thread_stopping(thread))
2002 lc_watchdog_touch(thread->t_watchdog,
2003 ptlrpc_server_get_timeout(svcpt));
2009 * Main thread body for service threads.
2010 * Waits in a loop waiting for new requests to process to appear.
2011 * Every time an incoming requests is added to its queue, a waitq
2012 * is woken up and one of the threads will handle it.
2014 static int ptlrpc_main(void *arg)
2016 struct ptlrpc_thread *thread = arg;
2017 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2018 struct ptlrpc_service *svc = svcpt->scp_service;
2019 struct ptlrpc_reply_state *rs;
2020 struct group_info *ginfo = NULL;
2022 int counter = 0, rc = 0;
2024 thread->t_pid = current_pid();
2025 unshare_fs_struct();
2027 /* NB: we will call cfs_cpt_bind() for all threads, because we
2028 * might want to run lustre server only on a subset of system CPUs,
2029 * in that case ->scp_cpt is CFS_CPT_ANY
2031 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2033 CWARN("%s: failed to bind %s on CPT %d\n",
2034 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2037 ginfo = groups_alloc(0);
2043 set_current_groups(ginfo);
2044 put_group_info(ginfo);
2046 if (svc->srv_ops.so_thr_init) {
2047 rc = svc->srv_ops.so_thr_init(thread);
2052 env = kzalloc(sizeof(*env), GFP_NOFS);
2058 rc = lu_context_init(&env->le_ctx,
2059 svc->srv_ctx_tags | LCT_REMEMBER | LCT_NOREF);
2063 thread->t_env = env;
2064 env->le_ctx.lc_thread = thread;
2065 env->le_ctx.lc_cookie = 0x6;
2067 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2068 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2072 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2073 svc->srv_name, svcpt->scp_cpt, rc);
2077 /* Alloc reply state structure for this one */
2078 rs = libcfs_kvzalloc(svc->srv_max_reply_size, GFP_NOFS);
2084 spin_lock(&svcpt->scp_lock);
2086 LASSERT(thread_is_starting(thread));
2087 thread_clear_flags(thread, SVC_STARTING);
2089 LASSERT(svcpt->scp_nthrs_starting == 1);
2090 svcpt->scp_nthrs_starting--;
2092 /* SVC_STOPPING may already be set here if someone else is trying
2093 * to stop the service while this new thread has been dynamically
2094 * forked. We still set SVC_RUNNING to let our creator know that
2095 * we are now running, however we will exit as soon as possible
2097 thread_add_flags(thread, SVC_RUNNING);
2098 svcpt->scp_nthrs_running++;
2099 spin_unlock(&svcpt->scp_lock);
2101 /* wake up our creator in case he's still waiting. */
2102 wake_up(&thread->t_ctl_waitq);
2105 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2109 spin_lock(&svcpt->scp_rep_lock);
2110 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2111 wake_up(&svcpt->scp_rep_waitq);
2112 spin_unlock(&svcpt->scp_rep_lock);
2114 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2115 svcpt->scp_nthrs_running);
2117 /* XXX maintain a list of all managed devices: insert here */
2118 while (!ptlrpc_thread_stopping(thread)) {
2119 if (ptlrpc_wait_event(svcpt, thread))
2122 ptlrpc_check_rqbd_pool(svcpt);
2124 if (ptlrpc_threads_need_create(svcpt)) {
2125 /* Ignore return code - we tried... */
2126 ptlrpc_start_thread(svcpt, 0);
2129 /* Process all incoming reqs before handling any */
2130 if (ptlrpc_server_request_incoming(svcpt)) {
2131 lu_context_enter(&env->le_ctx);
2133 ptlrpc_server_handle_req_in(svcpt, thread);
2134 lu_context_exit(&env->le_ctx);
2136 /* but limit ourselves in case of flood */
2137 if (counter++ < 100)
2142 if (ptlrpc_at_check(svcpt))
2143 ptlrpc_at_check_timed(svcpt);
2145 if (ptlrpc_server_request_pending(svcpt, false)) {
2146 lu_context_enter(&env->le_ctx);
2147 ptlrpc_server_handle_request(svcpt, thread);
2148 lu_context_exit(&env->le_ctx);
2151 if (ptlrpc_rqbd_pending(svcpt) &&
2152 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2153 /* I just failed to repost request buffers.
2154 * Wait for a timeout (unless something else
2155 * happens) before I try again
2157 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2158 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2159 svcpt->scp_nrqbds_posted);
2164 lc_watchdog_delete(thread->t_watchdog);
2165 thread->t_watchdog = NULL;
2170 * deconstruct service specific state created by ptlrpc_start_thread()
2172 if (svc->srv_ops.so_thr_done)
2173 svc->srv_ops.so_thr_done(thread);
2176 lu_context_fini(&env->le_ctx);
2180 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2181 thread, thread->t_pid, thread->t_id, rc);
2183 spin_lock(&svcpt->scp_lock);
2184 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2185 svcpt->scp_nthrs_starting--;
2187 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2188 /* must know immediately */
2189 svcpt->scp_nthrs_running--;
2193 thread_add_flags(thread, SVC_STOPPED);
2195 wake_up(&thread->t_ctl_waitq);
2196 spin_unlock(&svcpt->scp_lock);
2201 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2202 struct list_head *replies)
2206 spin_lock(&hrt->hrt_lock);
2208 list_splice_init(&hrt->hrt_queue, replies);
2209 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2211 spin_unlock(&hrt->hrt_lock);
2216 * Main body of "handle reply" function.
2217 * It processes acked reply states
2219 static int ptlrpc_hr_main(void *arg)
2221 struct ptlrpc_hr_thread *hrt = arg;
2222 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2224 char threadname[20];
2227 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2228 hrp->hrp_cpt, hrt->hrt_id);
2229 unshare_fs_struct();
2231 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2233 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2234 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2237 atomic_inc(&hrp->hrp_nstarted);
2238 wake_up(&ptlrpc_hr.hr_waitq);
2240 while (!ptlrpc_hr.hr_stopping) {
2241 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2243 while (!list_empty(&replies)) {
2244 struct ptlrpc_reply_state *rs;
2246 rs = list_entry(replies.prev, struct ptlrpc_reply_state,
2248 list_del_init(&rs->rs_list);
2249 ptlrpc_handle_rs(rs);
2253 atomic_inc(&hrp->hrp_nstopped);
2254 wake_up(&ptlrpc_hr.hr_waitq);
2259 static void ptlrpc_stop_hr_threads(void)
2261 struct ptlrpc_hr_partition *hrp;
2265 ptlrpc_hr.hr_stopping = 1;
2267 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2269 continue; /* uninitialized */
2270 for (j = 0; j < hrp->hrp_nthrs; j++)
2271 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2274 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2276 continue; /* uninitialized */
2277 wait_event(ptlrpc_hr.hr_waitq,
2278 atomic_read(&hrp->hrp_nstopped) ==
2279 atomic_read(&hrp->hrp_nstarted));
2283 static int ptlrpc_start_hr_threads(void)
2285 struct ptlrpc_hr_partition *hrp;
2289 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2292 for (j = 0; j < hrp->hrp_nthrs; j++) {
2293 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2294 struct task_struct *task;
2296 task = kthread_run(ptlrpc_hr_main,
2298 "ptlrpc_hr%02d_%03d",
2299 hrp->hrp_cpt, hrt->hrt_id);
2305 wait_event(ptlrpc_hr.hr_waitq,
2306 atomic_read(&hrp->hrp_nstarted) == j);
2309 CERROR("cannot start reply handler thread %d:%d: rc = %d\n",
2311 ptlrpc_stop_hr_threads();
2318 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2320 struct l_wait_info lwi = { 0 };
2321 struct ptlrpc_thread *thread;
2324 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2325 svcpt->scp_service->srv_name);
2327 spin_lock(&svcpt->scp_lock);
2328 /* let the thread know that we would like it to stop asap */
2329 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2330 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2331 svcpt->scp_service->srv_thread_name, thread->t_id);
2332 thread_add_flags(thread, SVC_STOPPING);
2335 wake_up_all(&svcpt->scp_waitq);
2337 while (!list_empty(&svcpt->scp_threads)) {
2338 thread = list_entry(svcpt->scp_threads.next,
2339 struct ptlrpc_thread, t_link);
2340 if (thread_is_stopped(thread)) {
2341 list_del(&thread->t_link);
2342 list_add(&thread->t_link, &zombie);
2345 spin_unlock(&svcpt->scp_lock);
2347 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2348 svcpt->scp_service->srv_thread_name, thread->t_id);
2349 l_wait_event(thread->t_ctl_waitq,
2350 thread_is_stopped(thread), &lwi);
2352 spin_lock(&svcpt->scp_lock);
2355 spin_unlock(&svcpt->scp_lock);
2357 while (!list_empty(&zombie)) {
2358 thread = list_entry(zombie.next,
2359 struct ptlrpc_thread, t_link);
2360 list_del(&thread->t_link);
2366 * Stops all threads of a particular service \a svc
2368 static void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2370 struct ptlrpc_service_part *svcpt;
2373 ptlrpc_service_for_each_part(svcpt, i, svc) {
2374 if (svcpt->scp_service)
2375 ptlrpc_svcpt_stop_threads(svcpt);
2379 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2385 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2386 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2388 for (i = 0; i < svc->srv_ncpts; i++) {
2389 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2390 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2396 /* We have enough threads, don't start more. b=15759 */
2403 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2404 svc->srv_thread_name, i, j, rc);
2405 ptlrpc_stop_all_threads(svc);
2409 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2411 struct l_wait_info lwi = { 0 };
2412 struct ptlrpc_thread *thread;
2413 struct ptlrpc_service *svc;
2414 struct task_struct *task;
2417 svc = svcpt->scp_service;
2419 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2420 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2421 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2424 if (unlikely(svc->srv_is_stopping))
2427 if (!ptlrpc_threads_increasable(svcpt) ||
2428 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2429 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2432 thread = kzalloc_node(sizeof(*thread), GFP_NOFS,
2433 cfs_cpt_spread_node(svc->srv_cptable,
2437 init_waitqueue_head(&thread->t_ctl_waitq);
2439 spin_lock(&svcpt->scp_lock);
2440 if (!ptlrpc_threads_increasable(svcpt)) {
2441 spin_unlock(&svcpt->scp_lock);
2446 if (svcpt->scp_nthrs_starting != 0) {
2447 /* serialize starting because some modules (obdfilter)
2448 * might require unique and contiguous t_id
2450 LASSERT(svcpt->scp_nthrs_starting == 1);
2451 spin_unlock(&svcpt->scp_lock);
2454 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2455 svc->srv_thread_name, svcpt->scp_thr_nextid);
2460 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2461 svc->srv_thread_name, svcpt->scp_thr_nextid);
2465 svcpt->scp_nthrs_starting++;
2466 thread->t_id = svcpt->scp_thr_nextid++;
2467 thread_add_flags(thread, SVC_STARTING);
2468 thread->t_svcpt = svcpt;
2470 list_add(&thread->t_link, &svcpt->scp_threads);
2471 spin_unlock(&svcpt->scp_lock);
2473 if (svcpt->scp_cpt >= 0) {
2474 snprintf(thread->t_name, sizeof(thread->t_name), "%s%02d_%03d",
2475 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2477 snprintf(thread->t_name, sizeof(thread->t_name), "%s_%04d",
2478 svc->srv_thread_name, thread->t_id);
2481 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2482 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
2485 CERROR("cannot start thread '%s': rc = %d\n",
2486 thread->t_name, rc);
2487 spin_lock(&svcpt->scp_lock);
2488 --svcpt->scp_nthrs_starting;
2489 if (thread_is_stopping(thread)) {
2490 /* this ptlrpc_thread is being handled
2491 * by ptlrpc_svcpt_stop_threads now
2493 thread_add_flags(thread, SVC_STOPPED);
2494 wake_up(&thread->t_ctl_waitq);
2495 spin_unlock(&svcpt->scp_lock);
2497 list_del(&thread->t_link);
2498 spin_unlock(&svcpt->scp_lock);
2507 l_wait_event(thread->t_ctl_waitq,
2508 thread_is_running(thread) || thread_is_stopped(thread),
2511 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2515 int ptlrpc_hr_init(void)
2517 struct ptlrpc_hr_partition *hrp;
2518 struct ptlrpc_hr_thread *hrt;
2524 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2525 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2527 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2529 if (!ptlrpc_hr.hr_partitions)
2532 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2534 weight = cpumask_weight(topology_sibling_cpumask(0));
2536 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2539 atomic_set(&hrp->hrp_nstarted, 0);
2540 atomic_set(&hrp->hrp_nstopped, 0);
2542 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
2543 hrp->hrp_nthrs /= weight;
2545 LASSERT(hrp->hrp_nthrs > 0);
2547 kzalloc_node(hrp->hrp_nthrs * sizeof(*hrt), GFP_NOFS,
2548 cfs_cpt_spread_node(ptlrpc_hr.hr_cpt_table,
2550 if (!hrp->hrp_thrs) {
2555 for (j = 0; j < hrp->hrp_nthrs; j++) {
2556 hrt = &hrp->hrp_thrs[j];
2559 hrt->hrt_partition = hrp;
2560 init_waitqueue_head(&hrt->hrt_waitq);
2561 spin_lock_init(&hrt->hrt_lock);
2562 INIT_LIST_HEAD(&hrt->hrt_queue);
2566 rc = ptlrpc_start_hr_threads();
2573 void ptlrpc_hr_fini(void)
2575 struct ptlrpc_hr_partition *hrp;
2578 if (!ptlrpc_hr.hr_partitions)
2581 ptlrpc_stop_hr_threads();
2583 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2584 kfree(hrp->hrp_thrs);
2587 cfs_percpt_free(ptlrpc_hr.hr_partitions);
2588 ptlrpc_hr.hr_partitions = NULL;
2592 * Wait until all already scheduled replies are processed.
2594 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
2598 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2601 rc = l_wait_event(svcpt->scp_waitq,
2602 atomic_read(&svcpt->scp_nreps_difficult) == 0,
2606 CWARN("Unexpectedly long timeout %s %p\n",
2607 svcpt->scp_service->srv_name, svcpt->scp_service);
2612 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
2614 struct ptlrpc_service_part *svcpt;
2617 /* early disarm AT timer... */
2618 ptlrpc_service_for_each_part(svcpt, i, svc) {
2619 if (svcpt->scp_service)
2620 del_timer(&svcpt->scp_at_timer);
2625 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
2627 struct ptlrpc_service_part *svcpt;
2628 struct ptlrpc_request_buffer_desc *rqbd;
2629 struct l_wait_info lwi;
2633 /* All history will be culled when the next request buffer is
2634 * freed in ptlrpc_service_purge_all()
2636 svc->srv_hist_nrqbds_cpt_max = 0;
2638 rc = LNetClearLazyPortal(svc->srv_req_portal);
2641 ptlrpc_service_for_each_part(svcpt, i, svc) {
2642 if (!svcpt->scp_service)
2645 /* Unlink all the request buffers. This forces a 'final'
2646 * event with its 'unlink' flag set for each posted rqbd
2648 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
2650 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2651 LASSERT(rc == 0 || rc == -ENOENT);
2655 ptlrpc_service_for_each_part(svcpt, i, svc) {
2656 if (!svcpt->scp_service)
2659 /* Wait for the network to release any buffers
2660 * it's currently filling
2662 spin_lock(&svcpt->scp_lock);
2663 while (svcpt->scp_nrqbds_posted != 0) {
2664 spin_unlock(&svcpt->scp_lock);
2665 /* Network access will complete in finite time but
2666 * the HUGE timeout lets us CWARN for visibility
2669 lwi = LWI_TIMEOUT_INTERVAL(
2670 cfs_time_seconds(LONG_UNLINK),
2671 cfs_time_seconds(1), NULL, NULL);
2672 rc = l_wait_event(svcpt->scp_waitq,
2673 svcpt->scp_nrqbds_posted == 0, &lwi);
2674 if (rc == -ETIMEDOUT) {
2675 CWARN("Service %s waiting for request buffers\n",
2676 svcpt->scp_service->srv_name);
2678 spin_lock(&svcpt->scp_lock);
2680 spin_unlock(&svcpt->scp_lock);
2685 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
2687 struct ptlrpc_service_part *svcpt;
2688 struct ptlrpc_request_buffer_desc *rqbd;
2689 struct ptlrpc_request *req;
2690 struct ptlrpc_reply_state *rs;
2693 ptlrpc_service_for_each_part(svcpt, i, svc) {
2694 if (!svcpt->scp_service)
2697 spin_lock(&svcpt->scp_rep_lock);
2698 while (!list_empty(&svcpt->scp_rep_active)) {
2699 rs = list_entry(svcpt->scp_rep_active.next,
2700 struct ptlrpc_reply_state, rs_list);
2701 spin_lock(&rs->rs_lock);
2702 ptlrpc_schedule_difficult_reply(rs);
2703 spin_unlock(&rs->rs_lock);
2705 spin_unlock(&svcpt->scp_rep_lock);
2707 /* purge the request queue. NB No new replies (rqbds
2708 * all unlinked) and no service threads, so I'm the only
2709 * thread noodling the request queue now
2711 while (!list_empty(&svcpt->scp_req_incoming)) {
2712 req = list_entry(svcpt->scp_req_incoming.next,
2713 struct ptlrpc_request, rq_list);
2715 list_del(&req->rq_list);
2716 svcpt->scp_nreqs_incoming--;
2717 ptlrpc_server_finish_request(svcpt, req);
2720 while (ptlrpc_server_request_pending(svcpt, true)) {
2721 req = ptlrpc_server_request_get(svcpt, true);
2722 ptlrpc_server_finish_active_request(svcpt, req);
2725 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
2726 LASSERT(svcpt->scp_nreqs_incoming == 0);
2727 LASSERT(svcpt->scp_nreqs_active == 0);
2728 /* history should have been culled by
2729 * ptlrpc_server_finish_request
2731 LASSERT(svcpt->scp_hist_nrqbds == 0);
2733 /* Now free all the request buffers since nothing
2734 * references them any more...
2737 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2738 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
2739 struct ptlrpc_request_buffer_desc,
2741 ptlrpc_free_rqbd(rqbd);
2743 ptlrpc_wait_replies(svcpt);
2745 while (!list_empty(&svcpt->scp_rep_idle)) {
2746 rs = list_entry(svcpt->scp_rep_idle.next,
2747 struct ptlrpc_reply_state,
2749 list_del(&rs->rs_list);
2756 ptlrpc_service_free(struct ptlrpc_service *svc)
2758 struct ptlrpc_service_part *svcpt;
2759 struct ptlrpc_at_array *array;
2762 ptlrpc_service_for_each_part(svcpt, i, svc) {
2763 if (!svcpt->scp_service)
2766 /* In case somebody rearmed this in the meantime */
2767 del_timer(&svcpt->scp_at_timer);
2768 array = &svcpt->scp_at_array;
2770 kfree(array->paa_reqs_array);
2771 array->paa_reqs_array = NULL;
2772 kfree(array->paa_reqs_count);
2773 array->paa_reqs_count = NULL;
2776 ptlrpc_service_for_each_part(svcpt, i, svc)
2780 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
2785 int ptlrpc_unregister_service(struct ptlrpc_service *service)
2787 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
2789 service->srv_is_stopping = 1;
2791 mutex_lock(&ptlrpc_all_services_mutex);
2792 list_del_init(&service->srv_list);
2793 mutex_unlock(&ptlrpc_all_services_mutex);
2795 ptlrpc_service_del_atimer(service);
2796 ptlrpc_stop_all_threads(service);
2798 ptlrpc_service_unlink_rqbd(service);
2799 ptlrpc_service_purge_all(service);
2800 ptlrpc_service_nrs_cleanup(service);
2802 ptlrpc_lprocfs_unregister_service(service);
2803 ptlrpc_sysfs_unregister_service(service);
2805 ptlrpc_service_free(service);
2809 EXPORT_SYMBOL(ptlrpc_unregister_service);