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);
1267 if (rc == -ESTALE) {
1268 req->rq_status = rc;
1271 /** can only return error,
1272 * 0 for normal request,
1273 * or 1 for high priority request
1278 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1279 list_add(&req->rq_exp_list, &req->rq_export->exp_hp_rpcs);
1280 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1283 ptlrpc_nrs_req_initialize(svcpt, req, rc);
1288 /** Remove the request from the export list. */
1289 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req)
1291 if (req->rq_export && req->rq_ops) {
1292 /* refresh lock timeout again so that client has more
1293 * room to send lock cancel RPC.
1295 if (req->rq_ops->hpreq_fini)
1296 req->rq_ops->hpreq_fini(req);
1298 spin_lock_bh(&req->rq_export->exp_rpc_lock);
1299 list_del_init(&req->rq_exp_list);
1300 spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1304 static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
1305 struct ptlrpc_request *req)
1309 rc = ptlrpc_server_hpreq_init(svcpt, req);
1313 ptlrpc_nrs_req_add(svcpt, req, !!rc);
1319 * Allow to handle high priority request
1320 * User can call it w/o any lock but need to hold
1321 * ptlrpc_service_part::scp_req_lock to get reliable result
1323 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt,
1326 int running = svcpt->scp_nthrs_running;
1328 if (!nrs_svcpt_has_hp(svcpt))
1334 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1335 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1336 /* leave just 1 thread for normal RPCs */
1337 running = PTLRPC_NTHRS_INIT;
1338 if (svcpt->scp_service->srv_ops.so_hpreq_handler)
1342 if (svcpt->scp_nreqs_active >= running - 1)
1345 if (svcpt->scp_nhreqs_active == 0)
1348 return !ptlrpc_nrs_req_pending_nolock(svcpt, false) ||
1349 svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio;
1352 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt,
1355 return ptlrpc_server_allow_high(svcpt, force) &&
1356 ptlrpc_nrs_req_pending_nolock(svcpt, true);
1360 * Only allow normal priority requests on a service that has a high-priority
1361 * queue if forced (i.e. cleanup), if there are other high priority requests
1362 * already being processed (i.e. those threads can service more high-priority
1363 * requests), or if there are enough idle threads that a later thread can do
1364 * a high priority request.
1365 * User can call it w/o any lock but need to hold
1366 * ptlrpc_service_part::scp_req_lock to get reliable result
1368 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt,
1371 int running = svcpt->scp_nthrs_running;
1373 if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL &&
1374 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) {
1375 /* leave just 1 thread for normal RPCs */
1376 running = PTLRPC_NTHRS_INIT;
1377 if (svcpt->scp_service->srv_ops.so_hpreq_handler)
1382 svcpt->scp_nreqs_active < running - 2)
1385 if (svcpt->scp_nreqs_active >= running - 1)
1388 return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt);
1391 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt,
1394 return ptlrpc_server_allow_normal(svcpt, force) &&
1395 ptlrpc_nrs_req_pending_nolock(svcpt, false);
1399 * Returns true if there are requests available in incoming
1400 * request queue for processing and it is allowed to fetch them.
1401 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1402 * to get reliable result
1403 * \see ptlrpc_server_allow_normal
1404 * \see ptlrpc_server_allow high
1407 ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force)
1409 return ptlrpc_server_high_pending(svcpt, force) ||
1410 ptlrpc_server_normal_pending(svcpt, force);
1414 * Fetch a request for processing from queue of unprocessed requests.
1415 * Favors high-priority requests.
1416 * Returns a pointer to fetched request.
1418 static struct ptlrpc_request *
1419 ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force)
1421 struct ptlrpc_request *req = NULL;
1423 spin_lock(&svcpt->scp_req_lock);
1425 if (ptlrpc_server_high_pending(svcpt, force)) {
1426 req = ptlrpc_nrs_req_get_nolock(svcpt, true, force);
1428 svcpt->scp_hreq_count++;
1433 if (ptlrpc_server_normal_pending(svcpt, force)) {
1434 req = ptlrpc_nrs_req_get_nolock(svcpt, false, force);
1436 svcpt->scp_hreq_count = 0;
1441 spin_unlock(&svcpt->scp_req_lock);
1445 svcpt->scp_nreqs_active++;
1447 svcpt->scp_nhreqs_active++;
1449 spin_unlock(&svcpt->scp_req_lock);
1451 if (likely(req->rq_export))
1452 class_export_rpc_inc(req->rq_export);
1458 * Handle freshly incoming reqs, add to timed early reply list,
1459 * pass on to regular request queue.
1460 * All incoming requests pass through here before getting into
1461 * ptlrpc_server_handle_req later on.
1464 ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
1465 struct ptlrpc_thread *thread)
1467 struct ptlrpc_service *svc = svcpt->scp_service;
1468 struct ptlrpc_request *req;
1472 spin_lock(&svcpt->scp_lock);
1473 if (list_empty(&svcpt->scp_req_incoming)) {
1474 spin_unlock(&svcpt->scp_lock);
1478 req = list_entry(svcpt->scp_req_incoming.next,
1479 struct ptlrpc_request, rq_list);
1480 list_del_init(&req->rq_list);
1481 svcpt->scp_nreqs_incoming--;
1482 /* Consider this still a "queued" request as far as stats are
1485 spin_unlock(&svcpt->scp_lock);
1487 /* go through security check/transform */
1488 rc = sptlrpc_svc_unwrap_request(req);
1492 case SECSVC_COMPLETE:
1493 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1502 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1503 * redo it wouldn't be harmful.
1505 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1506 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1508 CERROR("error unpacking request: ptl %d from %s x%llu\n",
1509 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1515 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1517 CERROR("error unpacking ptlrpc body: ptl %d from %s x%llu\n",
1518 svc->srv_req_portal, libcfs_id2str(req->rq_peer),
1523 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1524 lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) {
1525 CERROR("drop incoming rpc opc %u, x%llu\n",
1526 cfs_fail_val, req->rq_xid);
1531 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1532 CERROR("wrong packet type received (type=%u) from %s\n",
1533 lustre_msg_get_type(req->rq_reqmsg),
1534 libcfs_id2str(req->rq_peer));
1538 switch (lustre_msg_get_opc(req->rq_reqmsg)) {
1541 req->rq_bulk_write = 1;
1545 case MGS_CONFIG_READ:
1546 req->rq_bulk_read = 1;
1550 CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid);
1552 req->rq_export = class_conn2export(
1553 lustre_msg_get_handle(req->rq_reqmsg));
1554 if (req->rq_export) {
1555 rc = ptlrpc_check_req(req);
1557 rc = sptlrpc_target_export_check(req->rq_export, req);
1559 DEBUG_REQ(D_ERROR, req, "DROPPING req with illegal security flavor,");
1566 /* req_in handling should/must be fast */
1567 if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
1568 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1569 (long)(ktime_get_real_seconds() -
1570 req->rq_arrival_time.tv_sec));
1572 /* Set rpc server deadline and add it to the timed list */
1573 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1574 MSGHDR_AT_SUPPORT) ?
1575 /* The max time the client expects us to take */
1576 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1577 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1578 if (unlikely(deadline == 0)) {
1579 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1583 req->rq_svc_thread = thread;
1585 /* initialize request session, it is needed for request
1586 * processing by target
1588 rc = lu_context_init(&req->rq_session,
1589 LCT_SERVER_SESSION | LCT_NOREF);
1591 CERROR("%s: failure to initialize session: rc = %d\n",
1592 thread->t_name, rc);
1595 req->rq_session.lc_thread = thread;
1596 lu_context_enter(&req->rq_session);
1597 req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1600 ptlrpc_at_add_timed(req);
1602 /* Move it over to the request processing queue */
1603 rc = ptlrpc_server_request_add(svcpt, req);
1607 wake_up(&svcpt->scp_waitq);
1611 ptlrpc_server_finish_request(svcpt, req);
1617 * Main incoming request handling logic.
1618 * Calls handler function from service to do actual processing.
1621 ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
1622 struct ptlrpc_thread *thread)
1624 struct ptlrpc_service *svc = svcpt->scp_service;
1625 struct ptlrpc_request *request;
1626 struct timespec64 work_start;
1627 struct timespec64 work_end;
1628 struct timespec64 timediff;
1629 struct timespec64 arrived;
1630 unsigned long timediff_usecs;
1631 unsigned long arrived_usecs;
1634 request = ptlrpc_server_request_get(svcpt, false);
1638 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1639 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1640 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1641 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1643 if (unlikely(fail_opc)) {
1644 if (request->rq_export && request->rq_ops)
1645 OBD_FAIL_TIMEOUT(fail_opc, 4);
1648 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1650 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1651 libcfs_debug_dumplog();
1653 ktime_get_real_ts64(&work_start);
1654 timediff = timespec64_sub(work_start, request->rq_arrival_time);
1655 timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
1656 timediff.tv_nsec / NSEC_PER_USEC;
1657 if (likely(svc->srv_stats)) {
1658 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1660 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1661 svcpt->scp_nreqs_incoming);
1662 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1663 svcpt->scp_nreqs_active);
1664 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1665 at_get(&svcpt->scp_at_estimate));
1668 if (likely(request->rq_export)) {
1669 if (unlikely(ptlrpc_check_req(request)))
1673 /* Discard requests queued for longer than the deadline.
1674 * The deadline is increased if we send an early reply.
1676 if (ktime_get_real_seconds() > request->rq_deadline) {
1677 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline " CFS_DURATION_T ":" CFS_DURATION_T "s ago\n",
1678 libcfs_id2str(request->rq_peer),
1679 (long)(request->rq_deadline -
1680 request->rq_arrival_time.tv_sec),
1681 (long)(ktime_get_real_seconds() -
1682 request->rq_deadline));
1686 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d\n",
1688 (request->rq_export ?
1689 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1690 (request->rq_export ?
1691 atomic_read(&request->rq_export->exp_refcount) : -99),
1692 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1693 libcfs_id2str(request->rq_peer),
1694 lustre_msg_get_opc(request->rq_reqmsg));
1696 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1697 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val);
1699 CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
1701 /* re-assign request and sesson thread to the current one */
1702 request->rq_svc_thread = thread;
1704 LASSERT(request->rq_session.lc_thread);
1705 request->rq_session.lc_thread = thread;
1706 request->rq_session.lc_cookie = 0x55;
1707 thread->t_env->le_ses = &request->rq_session;
1709 svc->srv_ops.so_req_handler(request);
1711 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1714 if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
1715 DEBUG_REQ(D_WARNING, request,
1716 "Request took longer than estimated (%lld:%llds); "
1717 "client may timeout.",
1718 (s64)request->rq_deadline -
1719 request->rq_arrival_time.tv_sec,
1720 (s64)ktime_get_real_seconds() - request->rq_deadline);
1723 ktime_get_real_ts64(&work_end);
1724 timediff = timespec64_sub(work_end, work_start);
1725 timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
1726 timediff.tv_nsec / NSEC_PER_USEC;
1727 arrived = timespec64_sub(work_end, request->rq_arrival_time);
1728 arrived_usecs = arrived.tv_sec * USEC_PER_SEC +
1729 arrived.tv_nsec / NSEC_PER_USEC;
1730 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",
1732 (request->rq_export ?
1733 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1734 (request->rq_export ?
1735 atomic_read(&request->rq_export->exp_refcount) : -99),
1736 lustre_msg_get_status(request->rq_reqmsg),
1738 libcfs_id2str(request->rq_peer),
1739 lustre_msg_get_opc(request->rq_reqmsg),
1742 (request->rq_repmsg ?
1743 lustre_msg_get_transno(request->rq_repmsg) :
1744 request->rq_transno),
1746 (request->rq_repmsg ?
1747 lustre_msg_get_status(request->rq_repmsg) : -999));
1748 if (likely(svc->srv_stats && request->rq_reqmsg)) {
1749 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
1750 int opc = opcode_offset(op);
1752 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
1753 LASSERT(opc < LUSTRE_MAX_OPCODES);
1754 lprocfs_counter_add(svc->srv_stats,
1755 opc + EXTRA_MAX_OPCODES,
1759 if (unlikely(request->rq_early_count)) {
1760 DEBUG_REQ(D_ADAPTTO, request,
1761 "sent %d early replies before finishing in %llds",
1762 request->rq_early_count,
1763 (s64)work_end.tv_sec -
1764 request->rq_arrival_time.tv_sec);
1767 ptlrpc_server_finish_active_request(svcpt, request);
1773 * An internal function to process a single reply state object.
1776 ptlrpc_handle_rs(struct ptlrpc_reply_state *rs)
1778 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
1779 struct ptlrpc_service *svc = svcpt->scp_service;
1780 struct obd_export *exp;
1784 exp = rs->rs_export;
1786 LASSERT(rs->rs_difficult);
1787 LASSERT(rs->rs_scheduled);
1788 LASSERT(list_empty(&rs->rs_list));
1790 spin_lock(&exp->exp_lock);
1791 /* Noop if removed already */
1792 list_del_init(&rs->rs_exp_list);
1793 spin_unlock(&exp->exp_lock);
1795 /* The disk commit callback holds exp_uncommitted_replies_lock while it
1796 * iterates over newly committed replies, removing them from
1797 * exp_uncommitted_replies. It then drops this lock and schedules the
1798 * replies it found for handling here.
1800 * We can avoid contention for exp_uncommitted_replies_lock between the
1801 * HRT threads and further commit callbacks by checking rs_committed
1802 * which is set in the commit callback while it holds both
1803 * rs_lock and exp_uncommitted_reples.
1805 * If we see rs_committed clear, the commit callback _may_ not have
1806 * handled this reply yet and we race with it to grab
1807 * exp_uncommitted_replies_lock before removing the reply from
1808 * exp_uncommitted_replies. Note that if we lose the race and the
1809 * reply has already been removed, list_del_init() is a noop.
1811 * If we see rs_committed set, we know the commit callback is handling,
1812 * or has handled this reply since store reordering might allow us to
1813 * see rs_committed set out of sequence. But since this is done
1814 * holding rs_lock, we can be sure it has all completed once we hold
1815 * rs_lock, which we do right next.
1817 if (!rs->rs_committed) {
1818 spin_lock(&exp->exp_uncommitted_replies_lock);
1819 list_del_init(&rs->rs_obd_list);
1820 spin_unlock(&exp->exp_uncommitted_replies_lock);
1823 spin_lock(&rs->rs_lock);
1825 been_handled = rs->rs_handled;
1828 nlocks = rs->rs_nlocks; /* atomic "steal", but */
1829 rs->rs_nlocks = 0; /* locks still on rs_locks! */
1831 if (nlocks == 0 && !been_handled) {
1832 /* If we see this, we should already have seen the warning
1833 * in mds_steal_ack_locks()
1835 CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
1837 rs->rs_xid, rs->rs_transno, rs->rs_opc,
1838 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1841 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
1842 spin_unlock(&rs->rs_lock);
1844 if (!been_handled && rs->rs_on_net) {
1845 LNetMDUnlink(rs->rs_md_h);
1846 /* Ignore return code; we're racing with completion */
1849 while (nlocks-- > 0)
1850 ldlm_lock_decref(&rs->rs_locks[nlocks],
1851 rs->rs_modes[nlocks]);
1853 spin_lock(&rs->rs_lock);
1856 rs->rs_scheduled = 0;
1858 if (!rs->rs_on_net) {
1860 spin_unlock(&rs->rs_lock);
1862 class_export_put(exp);
1863 rs->rs_export = NULL;
1864 ptlrpc_rs_decref(rs);
1865 if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) &&
1866 svc->srv_is_stopping)
1867 wake_up_all(&svcpt->scp_waitq);
1871 /* still on the net; callback will schedule */
1872 spin_unlock(&rs->rs_lock);
1877 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt)
1879 int avail = svcpt->scp_nrqbds_posted;
1880 int low_water = test_req_buffer_pressure ? 0 :
1881 svcpt->scp_service->srv_nbuf_per_group / 2;
1883 /* NB I'm not locking; just looking. */
1885 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
1886 * allowed the request history to grow out of control. We could put a
1887 * sanity check on that here and cull some history if we need the
1891 if (avail <= low_water)
1892 ptlrpc_grow_req_bufs(svcpt, 1);
1894 if (svcpt->scp_service->srv_stats) {
1895 lprocfs_counter_add(svcpt->scp_service->srv_stats,
1896 PTLRPC_REQBUF_AVAIL_CNTR, avail);
1901 ptlrpc_retry_rqbds(void *arg)
1903 struct ptlrpc_service_part *svcpt = arg;
1905 svcpt->scp_rqbd_timeout = 0;
1910 ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
1912 return svcpt->scp_nreqs_active <
1913 svcpt->scp_nthrs_running - 1 -
1914 (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
1918 * allowed to create more threads
1919 * user can call it w/o any lock but need to hold
1920 * ptlrpc_service_part::scp_lock to get reliable result
1923 ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt)
1925 return svcpt->scp_nthrs_running +
1926 svcpt->scp_nthrs_starting <
1927 svcpt->scp_service->srv_nthrs_cpt_limit;
1931 * too many requests and allowed to create more threads
1934 ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt)
1936 return !ptlrpc_threads_enough(svcpt) &&
1937 ptlrpc_threads_increasable(svcpt);
1941 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
1943 return thread_is_stopping(thread) ||
1944 thread->t_svcpt->scp_service->srv_is_stopping;
1948 ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt)
1950 return !list_empty(&svcpt->scp_rqbd_idle) &&
1951 svcpt->scp_rqbd_timeout == 0;
1955 ptlrpc_at_check(struct ptlrpc_service_part *svcpt)
1957 return svcpt->scp_at_check;
1961 * requests wait on preprocessing
1962 * user can call it w/o any lock but need to hold
1963 * ptlrpc_service_part::scp_lock to get reliable result
1966 ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt)
1968 return !list_empty(&svcpt->scp_req_incoming);
1971 static __attribute__((__noinline__)) int
1972 ptlrpc_wait_event(struct ptlrpc_service_part *svcpt,
1973 struct ptlrpc_thread *thread)
1975 /* Don't exit while there are replies to be handled */
1976 struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
1977 ptlrpc_retry_rqbds, svcpt);
1979 /* XXX: Add this back when libcfs watchdog is merged upstream
1980 lc_watchdog_disable(thread->t_watchdog);
1985 l_wait_event_exclusive_head(svcpt->scp_waitq,
1986 ptlrpc_thread_stopping(thread) ||
1987 ptlrpc_server_request_incoming(svcpt) ||
1988 ptlrpc_server_request_pending(svcpt,
1990 ptlrpc_rqbd_pending(svcpt) ||
1991 ptlrpc_at_check(svcpt), &lwi);
1993 if (ptlrpc_thread_stopping(thread))
1997 lc_watchdog_touch(thread->t_watchdog,
1998 ptlrpc_server_get_timeout(svcpt));
2004 * Main thread body for service threads.
2005 * Waits in a loop waiting for new requests to process to appear.
2006 * Every time an incoming requests is added to its queue, a waitq
2007 * is woken up and one of the threads will handle it.
2009 static int ptlrpc_main(void *arg)
2011 struct ptlrpc_thread *thread = arg;
2012 struct ptlrpc_service_part *svcpt = thread->t_svcpt;
2013 struct ptlrpc_service *svc = svcpt->scp_service;
2014 struct ptlrpc_reply_state *rs;
2015 struct group_info *ginfo = NULL;
2017 int counter = 0, rc = 0;
2019 thread->t_pid = current_pid();
2020 unshare_fs_struct();
2022 /* NB: we will call cfs_cpt_bind() for all threads, because we
2023 * might want to run lustre server only on a subset of system CPUs,
2024 * in that case ->scp_cpt is CFS_CPT_ANY
2026 rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt);
2028 CWARN("%s: failed to bind %s on CPT %d\n",
2029 svc->srv_name, thread->t_name, svcpt->scp_cpt);
2032 ginfo = groups_alloc(0);
2038 set_current_groups(ginfo);
2039 put_group_info(ginfo);
2041 if (svc->srv_ops.so_thr_init) {
2042 rc = svc->srv_ops.so_thr_init(thread);
2047 env = kzalloc(sizeof(*env), GFP_NOFS);
2053 rc = lu_context_init(&env->le_ctx,
2054 svc->srv_ctx_tags | LCT_REMEMBER | LCT_NOREF);
2058 thread->t_env = env;
2059 env->le_ctx.lc_thread = thread;
2060 env->le_ctx.lc_cookie = 0x6;
2062 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2063 rc = ptlrpc_server_post_idle_rqbds(svcpt);
2067 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2068 svc->srv_name, svcpt->scp_cpt, rc);
2072 /* Alloc reply state structure for this one */
2073 rs = libcfs_kvzalloc(svc->srv_max_reply_size, GFP_NOFS);
2079 spin_lock(&svcpt->scp_lock);
2081 LASSERT(thread_is_starting(thread));
2082 thread_clear_flags(thread, SVC_STARTING);
2084 LASSERT(svcpt->scp_nthrs_starting == 1);
2085 svcpt->scp_nthrs_starting--;
2087 /* SVC_STOPPING may already be set here if someone else is trying
2088 * to stop the service while this new thread has been dynamically
2089 * forked. We still set SVC_RUNNING to let our creator know that
2090 * we are now running, however we will exit as soon as possible
2092 thread_add_flags(thread, SVC_RUNNING);
2093 svcpt->scp_nthrs_running++;
2094 spin_unlock(&svcpt->scp_lock);
2096 /* wake up our creator in case he's still waiting. */
2097 wake_up(&thread->t_ctl_waitq);
2100 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2104 spin_lock(&svcpt->scp_rep_lock);
2105 list_add(&rs->rs_list, &svcpt->scp_rep_idle);
2106 wake_up(&svcpt->scp_rep_waitq);
2107 spin_unlock(&svcpt->scp_rep_lock);
2109 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2110 svcpt->scp_nthrs_running);
2112 /* XXX maintain a list of all managed devices: insert here */
2113 while (!ptlrpc_thread_stopping(thread)) {
2114 if (ptlrpc_wait_event(svcpt, thread))
2117 ptlrpc_check_rqbd_pool(svcpt);
2119 if (ptlrpc_threads_need_create(svcpt)) {
2120 /* Ignore return code - we tried... */
2121 ptlrpc_start_thread(svcpt, 0);
2124 /* Process all incoming reqs before handling any */
2125 if (ptlrpc_server_request_incoming(svcpt)) {
2126 lu_context_enter(&env->le_ctx);
2128 ptlrpc_server_handle_req_in(svcpt, thread);
2129 lu_context_exit(&env->le_ctx);
2131 /* but limit ourselves in case of flood */
2132 if (counter++ < 100)
2137 if (ptlrpc_at_check(svcpt))
2138 ptlrpc_at_check_timed(svcpt);
2140 if (ptlrpc_server_request_pending(svcpt, false)) {
2141 lu_context_enter(&env->le_ctx);
2142 ptlrpc_server_handle_request(svcpt, thread);
2143 lu_context_exit(&env->le_ctx);
2146 if (ptlrpc_rqbd_pending(svcpt) &&
2147 ptlrpc_server_post_idle_rqbds(svcpt) < 0) {
2148 /* I just failed to repost request buffers.
2149 * Wait for a timeout (unless something else
2150 * happens) before I try again
2152 svcpt->scp_rqbd_timeout = cfs_time_seconds(1) / 10;
2153 CDEBUG(D_RPCTRACE, "Posted buffers: %d\n",
2154 svcpt->scp_nrqbds_posted);
2159 lc_watchdog_delete(thread->t_watchdog);
2160 thread->t_watchdog = NULL;
2165 * deconstruct service specific state created by ptlrpc_start_thread()
2167 if (svc->srv_ops.so_thr_done)
2168 svc->srv_ops.so_thr_done(thread);
2171 lu_context_fini(&env->le_ctx);
2175 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2176 thread, thread->t_pid, thread->t_id, rc);
2178 spin_lock(&svcpt->scp_lock);
2179 if (thread_test_and_clear_flags(thread, SVC_STARTING))
2180 svcpt->scp_nthrs_starting--;
2182 if (thread_test_and_clear_flags(thread, SVC_RUNNING)) {
2183 /* must know immediately */
2184 svcpt->scp_nthrs_running--;
2188 thread_add_flags(thread, SVC_STOPPED);
2190 wake_up(&thread->t_ctl_waitq);
2191 spin_unlock(&svcpt->scp_lock);
2196 static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt,
2197 struct list_head *replies)
2201 spin_lock(&hrt->hrt_lock);
2203 list_splice_init(&hrt->hrt_queue, replies);
2204 result = ptlrpc_hr.hr_stopping || !list_empty(replies);
2206 spin_unlock(&hrt->hrt_lock);
2211 * Main body of "handle reply" function.
2212 * It processes acked reply states
2214 static int ptlrpc_hr_main(void *arg)
2216 struct ptlrpc_hr_thread *hrt = arg;
2217 struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
2219 char threadname[20];
2222 snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d",
2223 hrp->hrp_cpt, hrt->hrt_id);
2224 unshare_fs_struct();
2226 rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt);
2228 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2229 threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
2232 atomic_inc(&hrp->hrp_nstarted);
2233 wake_up(&ptlrpc_hr.hr_waitq);
2235 while (!ptlrpc_hr.hr_stopping) {
2236 l_wait_condition(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies));
2238 while (!list_empty(&replies)) {
2239 struct ptlrpc_reply_state *rs;
2241 rs = list_entry(replies.prev, struct ptlrpc_reply_state,
2243 list_del_init(&rs->rs_list);
2244 ptlrpc_handle_rs(rs);
2248 atomic_inc(&hrp->hrp_nstopped);
2249 wake_up(&ptlrpc_hr.hr_waitq);
2254 static void ptlrpc_stop_hr_threads(void)
2256 struct ptlrpc_hr_partition *hrp;
2260 ptlrpc_hr.hr_stopping = 1;
2262 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2264 continue; /* uninitialized */
2265 for (j = 0; j < hrp->hrp_nthrs; j++)
2266 wake_up_all(&hrp->hrp_thrs[j].hrt_waitq);
2269 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2271 continue; /* uninitialized */
2272 wait_event(ptlrpc_hr.hr_waitq,
2273 atomic_read(&hrp->hrp_nstopped) ==
2274 atomic_read(&hrp->hrp_nstarted));
2278 static int ptlrpc_start_hr_threads(void)
2280 struct ptlrpc_hr_partition *hrp;
2284 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2287 for (j = 0; j < hrp->hrp_nthrs; j++) {
2288 struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j];
2289 struct task_struct *task;
2291 task = kthread_run(ptlrpc_hr_main,
2293 "ptlrpc_hr%02d_%03d",
2294 hrp->hrp_cpt, hrt->hrt_id);
2300 wait_event(ptlrpc_hr.hr_waitq,
2301 atomic_read(&hrp->hrp_nstarted) == j);
2304 CERROR("cannot start reply handler thread %d:%d: rc = %d\n",
2306 ptlrpc_stop_hr_threads();
2313 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt)
2315 struct l_wait_info lwi = { 0 };
2316 struct ptlrpc_thread *thread;
2319 CDEBUG(D_INFO, "Stopping threads for service %s\n",
2320 svcpt->scp_service->srv_name);
2322 spin_lock(&svcpt->scp_lock);
2323 /* let the thread know that we would like it to stop asap */
2324 list_for_each_entry(thread, &svcpt->scp_threads, t_link) {
2325 CDEBUG(D_INFO, "Stopping thread %s #%u\n",
2326 svcpt->scp_service->srv_thread_name, thread->t_id);
2327 thread_add_flags(thread, SVC_STOPPING);
2330 wake_up_all(&svcpt->scp_waitq);
2332 while (!list_empty(&svcpt->scp_threads)) {
2333 thread = list_entry(svcpt->scp_threads.next,
2334 struct ptlrpc_thread, t_link);
2335 if (thread_is_stopped(thread)) {
2336 list_del(&thread->t_link);
2337 list_add(&thread->t_link, &zombie);
2340 spin_unlock(&svcpt->scp_lock);
2342 CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n",
2343 svcpt->scp_service->srv_thread_name, thread->t_id);
2344 l_wait_event(thread->t_ctl_waitq,
2345 thread_is_stopped(thread), &lwi);
2347 spin_lock(&svcpt->scp_lock);
2350 spin_unlock(&svcpt->scp_lock);
2352 while (!list_empty(&zombie)) {
2353 thread = list_entry(zombie.next,
2354 struct ptlrpc_thread, t_link);
2355 list_del(&thread->t_link);
2361 * Stops all threads of a particular service \a svc
2363 static void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2365 struct ptlrpc_service_part *svcpt;
2368 ptlrpc_service_for_each_part(svcpt, i, svc) {
2369 if (svcpt->scp_service)
2370 ptlrpc_svcpt_stop_threads(svcpt);
2374 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2380 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2381 LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT);
2383 for (i = 0; i < svc->srv_ncpts; i++) {
2384 for (j = 0; j < svc->srv_nthrs_cpt_init; j++) {
2385 rc = ptlrpc_start_thread(svc->srv_parts[i], 1);
2391 /* We have enough threads, don't start more. b=15759 */
2398 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2399 svc->srv_thread_name, i, j, rc);
2400 ptlrpc_stop_all_threads(svc);
2404 int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
2406 struct l_wait_info lwi = { 0 };
2407 struct ptlrpc_thread *thread;
2408 struct ptlrpc_service *svc;
2409 struct task_struct *task;
2412 svc = svcpt->scp_service;
2414 CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n",
2415 svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running,
2416 svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit);
2419 if (unlikely(svc->srv_is_stopping))
2422 if (!ptlrpc_threads_increasable(svcpt) ||
2423 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2424 svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1))
2427 thread = kzalloc_node(sizeof(*thread), GFP_NOFS,
2428 cfs_cpt_spread_node(svc->srv_cptable,
2432 init_waitqueue_head(&thread->t_ctl_waitq);
2434 spin_lock(&svcpt->scp_lock);
2435 if (!ptlrpc_threads_increasable(svcpt)) {
2436 spin_unlock(&svcpt->scp_lock);
2441 if (svcpt->scp_nthrs_starting != 0) {
2442 /* serialize starting because some modules (obdfilter)
2443 * might require unique and contiguous t_id
2445 LASSERT(svcpt->scp_nthrs_starting == 1);
2446 spin_unlock(&svcpt->scp_lock);
2449 CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n",
2450 svc->srv_thread_name, svcpt->scp_thr_nextid);
2455 CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n",
2456 svc->srv_thread_name, svcpt->scp_thr_nextid);
2460 svcpt->scp_nthrs_starting++;
2461 thread->t_id = svcpt->scp_thr_nextid++;
2462 thread_add_flags(thread, SVC_STARTING);
2463 thread->t_svcpt = svcpt;
2465 list_add(&thread->t_link, &svcpt->scp_threads);
2466 spin_unlock(&svcpt->scp_lock);
2468 if (svcpt->scp_cpt >= 0) {
2469 snprintf(thread->t_name, sizeof(thread->t_name), "%s%02d_%03d",
2470 svc->srv_thread_name, svcpt->scp_cpt, thread->t_id);
2472 snprintf(thread->t_name, sizeof(thread->t_name), "%s_%04d",
2473 svc->srv_thread_name, thread->t_id);
2476 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name);
2477 task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name);
2480 CERROR("cannot start thread '%s': rc = %d\n",
2481 thread->t_name, rc);
2482 spin_lock(&svcpt->scp_lock);
2483 --svcpt->scp_nthrs_starting;
2484 if (thread_is_stopping(thread)) {
2485 /* this ptlrpc_thread is being handled
2486 * by ptlrpc_svcpt_stop_threads now
2488 thread_add_flags(thread, SVC_STOPPED);
2489 wake_up(&thread->t_ctl_waitq);
2490 spin_unlock(&svcpt->scp_lock);
2492 list_del(&thread->t_link);
2493 spin_unlock(&svcpt->scp_lock);
2502 l_wait_event(thread->t_ctl_waitq,
2503 thread_is_running(thread) || thread_is_stopped(thread),
2506 rc = thread_is_stopped(thread) ? thread->t_id : 0;
2510 int ptlrpc_hr_init(void)
2512 struct ptlrpc_hr_partition *hrp;
2513 struct ptlrpc_hr_thread *hrt;
2519 memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr));
2520 ptlrpc_hr.hr_cpt_table = cfs_cpt_table;
2522 ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
2524 if (!ptlrpc_hr.hr_partitions)
2527 init_waitqueue_head(&ptlrpc_hr.hr_waitq);
2529 weight = cpumask_weight(topology_sibling_cpumask(0));
2531 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2534 atomic_set(&hrp->hrp_nstarted, 0);
2535 atomic_set(&hrp->hrp_nstopped, 0);
2537 hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i);
2538 hrp->hrp_nthrs /= weight;
2540 LASSERT(hrp->hrp_nthrs > 0);
2542 kzalloc_node(hrp->hrp_nthrs * sizeof(*hrt), GFP_NOFS,
2543 cfs_cpt_spread_node(ptlrpc_hr.hr_cpt_table,
2545 if (!hrp->hrp_thrs) {
2550 for (j = 0; j < hrp->hrp_nthrs; j++) {
2551 hrt = &hrp->hrp_thrs[j];
2554 hrt->hrt_partition = hrp;
2555 init_waitqueue_head(&hrt->hrt_waitq);
2556 spin_lock_init(&hrt->hrt_lock);
2557 INIT_LIST_HEAD(&hrt->hrt_queue);
2561 rc = ptlrpc_start_hr_threads();
2568 void ptlrpc_hr_fini(void)
2570 struct ptlrpc_hr_partition *hrp;
2573 if (!ptlrpc_hr.hr_partitions)
2576 ptlrpc_stop_hr_threads();
2578 cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
2579 kfree(hrp->hrp_thrs);
2582 cfs_percpt_free(ptlrpc_hr.hr_partitions);
2583 ptlrpc_hr.hr_partitions = NULL;
2587 * Wait until all already scheduled replies are processed.
2589 static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
2593 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2596 rc = l_wait_event(svcpt->scp_waitq,
2597 atomic_read(&svcpt->scp_nreps_difficult) == 0,
2601 CWARN("Unexpectedly long timeout %s %p\n",
2602 svcpt->scp_service->srv_name, svcpt->scp_service);
2607 ptlrpc_service_del_atimer(struct ptlrpc_service *svc)
2609 struct ptlrpc_service_part *svcpt;
2612 /* early disarm AT timer... */
2613 ptlrpc_service_for_each_part(svcpt, i, svc) {
2614 if (svcpt->scp_service)
2615 del_timer(&svcpt->scp_at_timer);
2620 ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc)
2622 struct ptlrpc_service_part *svcpt;
2623 struct ptlrpc_request_buffer_desc *rqbd;
2624 struct l_wait_info lwi;
2628 /* All history will be culled when the next request buffer is
2629 * freed in ptlrpc_service_purge_all()
2631 svc->srv_hist_nrqbds_cpt_max = 0;
2633 rc = LNetClearLazyPortal(svc->srv_req_portal);
2636 ptlrpc_service_for_each_part(svcpt, i, svc) {
2637 if (!svcpt->scp_service)
2640 /* Unlink all the request buffers. This forces a 'final'
2641 * event with its 'unlink' flag set for each posted rqbd
2643 list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted,
2645 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2646 LASSERT(rc == 0 || rc == -ENOENT);
2650 ptlrpc_service_for_each_part(svcpt, i, svc) {
2651 if (!svcpt->scp_service)
2654 /* Wait for the network to release any buffers
2655 * it's currently filling
2657 spin_lock(&svcpt->scp_lock);
2658 while (svcpt->scp_nrqbds_posted != 0) {
2659 spin_unlock(&svcpt->scp_lock);
2660 /* Network access will complete in finite time but
2661 * the HUGE timeout lets us CWARN for visibility
2664 lwi = LWI_TIMEOUT_INTERVAL(
2665 cfs_time_seconds(LONG_UNLINK),
2666 cfs_time_seconds(1), NULL, NULL);
2667 rc = l_wait_event(svcpt->scp_waitq,
2668 svcpt->scp_nrqbds_posted == 0, &lwi);
2669 if (rc == -ETIMEDOUT) {
2670 CWARN("Service %s waiting for request buffers\n",
2671 svcpt->scp_service->srv_name);
2673 spin_lock(&svcpt->scp_lock);
2675 spin_unlock(&svcpt->scp_lock);
2680 ptlrpc_service_purge_all(struct ptlrpc_service *svc)
2682 struct ptlrpc_service_part *svcpt;
2683 struct ptlrpc_request_buffer_desc *rqbd;
2684 struct ptlrpc_request *req;
2685 struct ptlrpc_reply_state *rs;
2688 ptlrpc_service_for_each_part(svcpt, i, svc) {
2689 if (!svcpt->scp_service)
2692 spin_lock(&svcpt->scp_rep_lock);
2693 while (!list_empty(&svcpt->scp_rep_active)) {
2694 rs = list_entry(svcpt->scp_rep_active.next,
2695 struct ptlrpc_reply_state, rs_list);
2696 spin_lock(&rs->rs_lock);
2697 ptlrpc_schedule_difficult_reply(rs);
2698 spin_unlock(&rs->rs_lock);
2700 spin_unlock(&svcpt->scp_rep_lock);
2702 /* purge the request queue. NB No new replies (rqbds
2703 * all unlinked) and no service threads, so I'm the only
2704 * thread noodling the request queue now
2706 while (!list_empty(&svcpt->scp_req_incoming)) {
2707 req = list_entry(svcpt->scp_req_incoming.next,
2708 struct ptlrpc_request, rq_list);
2710 list_del(&req->rq_list);
2711 svcpt->scp_nreqs_incoming--;
2712 ptlrpc_server_finish_request(svcpt, req);
2715 while (ptlrpc_server_request_pending(svcpt, true)) {
2716 req = ptlrpc_server_request_get(svcpt, true);
2717 ptlrpc_server_finish_active_request(svcpt, req);
2720 LASSERT(list_empty(&svcpt->scp_rqbd_posted));
2721 LASSERT(svcpt->scp_nreqs_incoming == 0);
2722 LASSERT(svcpt->scp_nreqs_active == 0);
2723 /* history should have been culled by
2724 * ptlrpc_server_finish_request
2726 LASSERT(svcpt->scp_hist_nrqbds == 0);
2728 /* Now free all the request buffers since nothing
2729 * references them any more...
2732 while (!list_empty(&svcpt->scp_rqbd_idle)) {
2733 rqbd = list_entry(svcpt->scp_rqbd_idle.next,
2734 struct ptlrpc_request_buffer_desc,
2736 ptlrpc_free_rqbd(rqbd);
2738 ptlrpc_wait_replies(svcpt);
2740 while (!list_empty(&svcpt->scp_rep_idle)) {
2741 rs = list_entry(svcpt->scp_rep_idle.next,
2742 struct ptlrpc_reply_state,
2744 list_del(&rs->rs_list);
2751 ptlrpc_service_free(struct ptlrpc_service *svc)
2753 struct ptlrpc_service_part *svcpt;
2754 struct ptlrpc_at_array *array;
2757 ptlrpc_service_for_each_part(svcpt, i, svc) {
2758 if (!svcpt->scp_service)
2761 /* In case somebody rearmed this in the meantime */
2762 del_timer(&svcpt->scp_at_timer);
2763 array = &svcpt->scp_at_array;
2765 kfree(array->paa_reqs_array);
2766 array->paa_reqs_array = NULL;
2767 kfree(array->paa_reqs_count);
2768 array->paa_reqs_count = NULL;
2771 ptlrpc_service_for_each_part(svcpt, i, svc)
2775 cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
2780 int ptlrpc_unregister_service(struct ptlrpc_service *service)
2782 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
2784 service->srv_is_stopping = 1;
2786 mutex_lock(&ptlrpc_all_services_mutex);
2787 list_del_init(&service->srv_list);
2788 mutex_unlock(&ptlrpc_all_services_mutex);
2790 ptlrpc_service_del_atimer(service);
2791 ptlrpc_stop_all_threads(service);
2793 ptlrpc_service_unlink_rqbd(service);
2794 ptlrpc_service_purge_all(service);
2795 ptlrpc_service_nrs_cleanup(service);
2797 ptlrpc_lprocfs_unregister_service(service);
2798 ptlrpc_sysfs_unregister_service(service);
2800 ptlrpc_service_free(service);
2804 EXPORT_SYMBOL(ptlrpc_unregister_service);