1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_RPC
39 #include <liblustre.h>
41 #include <obd_support.h>
42 #include <obd_class.h>
43 #include <lustre_net.h>
44 #include <lu_object.h>
45 #include <lnet/types.h>
46 #include "ptlrpc_internal.h"
48 /* The following are visible and mutable through /sys/module/ptlrpc */
49 int test_req_buffer_pressure = 0;
50 CFS_MODULE_PARM(test_req_buffer_pressure, "i", int, 0444,
51 "set non-zero to put pressure on request buffer pools");
52 CFS_MODULE_PARM(at_min, "i", int, 0644,
53 "Adaptive timeout minimum (sec)");
54 CFS_MODULE_PARM(at_max, "i", int, 0644,
55 "Adaptive timeout maximum (sec)");
56 CFS_MODULE_PARM(at_history, "i", int, 0644,
57 "Adaptive timeouts remember the slowest event that took place "
58 "within this period (sec)");
59 CFS_MODULE_PARM(at_early_margin, "i", int, 0644,
60 "How soon before an RPC deadline to send an early reply");
61 CFS_MODULE_PARM(at_extra, "i", int, 0644,
62 "How much extra time to give with each early reply");
66 static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc);
68 static CFS_LIST_HEAD(ptlrpc_all_services);
69 cfs_spinlock_t ptlrpc_all_services_lock;
72 ptlrpc_alloc_request_buffer (int size)
76 if (size > SVC_BUF_VMALLOC_THRESHOLD)
77 OBD_VMALLOC(ptr, size);
85 ptlrpc_free_request_buffer (char *ptr, int size)
87 if (size > SVC_BUF_VMALLOC_THRESHOLD)
93 struct ptlrpc_request_buffer_desc *
94 ptlrpc_alloc_rqbd (struct ptlrpc_service *svc)
96 struct ptlrpc_request_buffer_desc *rqbd;
102 rqbd->rqbd_service = svc;
103 rqbd->rqbd_refcount = 0;
104 rqbd->rqbd_cbid.cbid_fn = request_in_callback;
105 rqbd->rqbd_cbid.cbid_arg = rqbd;
106 CFS_INIT_LIST_HEAD(&rqbd->rqbd_reqs);
107 rqbd->rqbd_buffer = ptlrpc_alloc_request_buffer(svc->srv_buf_size);
109 if (rqbd->rqbd_buffer == NULL) {
114 cfs_spin_lock(&svc->srv_lock);
115 cfs_list_add(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
117 cfs_spin_unlock(&svc->srv_lock);
123 ptlrpc_free_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
125 struct ptlrpc_service *svc = rqbd->rqbd_service;
127 LASSERT (rqbd->rqbd_refcount == 0);
128 LASSERT (cfs_list_empty(&rqbd->rqbd_reqs));
130 cfs_spin_lock(&svc->srv_lock);
131 cfs_list_del(&rqbd->rqbd_list);
133 cfs_spin_unlock(&svc->srv_lock);
135 ptlrpc_free_request_buffer (rqbd->rqbd_buffer, svc->srv_buf_size);
140 ptlrpc_grow_req_bufs(struct ptlrpc_service *svc)
142 struct ptlrpc_request_buffer_desc *rqbd;
145 CDEBUG(D_RPCTRACE, "%s: allocate %d new %d-byte reqbufs (%d/%d left)\n",
146 svc->srv_name, svc->srv_nbuf_per_group, svc->srv_buf_size,
147 svc->srv_nrqbd_receiving, svc->srv_nbufs);
148 for (i = 0; i < svc->srv_nbuf_per_group; i++) {
149 rqbd = ptlrpc_alloc_rqbd(svc);
152 CERROR ("%s: Can't allocate request buffer\n",
157 if (ptlrpc_server_post_idle_rqbds(svc) < 0)
165 ptlrpc_save_lock(struct ptlrpc_request *req,
166 struct lustre_handle *lock, int mode, int no_ack)
168 struct ptlrpc_reply_state *rs = req->rq_reply_state;
172 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
174 if (req->rq_export->exp_disconnected) {
175 ldlm_lock_decref(lock, mode);
177 idx = rs->rs_nlocks++;
178 rs->rs_locks[idx] = *lock;
179 rs->rs_modes[idx] = mode;
180 rs->rs_difficult = 1;
181 rs->rs_no_ack = !!no_ack;
187 #define HRT_RUNNING 0
188 #define HRT_STOPPING 1
190 struct ptlrpc_hr_thread {
191 cfs_spinlock_t hrt_lock;
192 unsigned long hrt_flags;
193 cfs_waitq_t hrt_wait;
194 cfs_list_t hrt_queue;
195 cfs_completion_t hrt_completion;
198 struct ptlrpc_hr_service {
202 struct ptlrpc_hr_thread hr_threads[0];
206 cfs_list_t rsb_replies;
207 struct ptlrpc_service *rsb_svc;
208 unsigned int rsb_n_replies;
212 * A pointer to per-node reply handling service.
214 static struct ptlrpc_hr_service *ptlrpc_hr = NULL;
217 * maximum mumber of replies scheduled in one batch
219 #define MAX_SCHEDULED 256
222 * Initialize a reply batch.
226 static void rs_batch_init(struct rs_batch *b)
228 memset(b, 0, sizeof *b);
229 CFS_INIT_LIST_HEAD(&b->rsb_replies);
233 * Choose an hr thread to dispatch requests to.
235 static unsigned int get_hr_thread_index(struct ptlrpc_hr_service *hr)
239 /* Concurrent modification of hr_index w/o any spinlock
240 protection is harmless as long as the result fits
241 [0..(hr_n_threads-1)] range and each thread gets near equal
244 hr->hr_index = (idx >= hr->hr_n_threads - 1) ? 0 : idx + 1;
249 * Dispatch all replies accumulated in the batch to one from
250 * dedicated reply handling threads.
254 static void rs_batch_dispatch(struct rs_batch *b)
256 if (b->rsb_n_replies != 0) {
257 struct ptlrpc_hr_service *hr = ptlrpc_hr;
260 idx = get_hr_thread_index(hr);
262 cfs_spin_lock(&hr->hr_threads[idx].hrt_lock);
263 cfs_list_splice_init(&b->rsb_replies,
264 &hr->hr_threads[idx].hrt_queue);
265 cfs_spin_unlock(&hr->hr_threads[idx].hrt_lock);
266 cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait);
267 b->rsb_n_replies = 0;
272 * Add a reply to a batch.
273 * Add one reply object to a batch, schedule batched replies if overload.
278 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
280 struct ptlrpc_service *svc = rs->rs_service;
282 if (svc != b->rsb_svc || b->rsb_n_replies >= MAX_SCHEDULED) {
283 if (b->rsb_svc != NULL) {
284 rs_batch_dispatch(b);
285 cfs_spin_unlock(&b->rsb_svc->srv_lock);
287 cfs_spin_lock(&svc->srv_lock);
290 cfs_spin_lock(&rs->rs_lock);
291 rs->rs_scheduled_ever = 1;
292 if (rs->rs_scheduled == 0) {
293 cfs_list_move(&rs->rs_list, &b->rsb_replies);
294 rs->rs_scheduled = 1;
297 rs->rs_committed = 1;
298 cfs_spin_unlock(&rs->rs_lock);
302 * Reply batch finalization.
303 * Dispatch remaining replies from the batch
304 * and release remaining spinlock.
308 static void rs_batch_fini(struct rs_batch *b)
310 if (b->rsb_svc != 0) {
311 rs_batch_dispatch(b);
312 cfs_spin_unlock(&b->rsb_svc->srv_lock);
316 #define DECLARE_RS_BATCH(b) struct rs_batch b
318 #else /* __KERNEL__ */
320 #define rs_batch_init(b) do{}while(0)
321 #define rs_batch_fini(b) do{}while(0)
322 #define rs_batch_add(b, r) ptlrpc_schedule_difficult_reply(r)
323 #define DECLARE_RS_BATCH(b)
325 #endif /* __KERNEL__ */
327 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
330 struct ptlrpc_hr_service *hr = ptlrpc_hr;
334 LASSERT(cfs_list_empty(&rs->rs_list));
336 idx = get_hr_thread_index(hr);
337 cfs_spin_lock(&hr->hr_threads[idx].hrt_lock);
338 cfs_list_add_tail(&rs->rs_list, &hr->hr_threads[idx].hrt_queue);
339 cfs_spin_unlock(&hr->hr_threads[idx].hrt_lock);
340 cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait);
343 cfs_list_add_tail(&rs->rs_list, &rs->rs_service->srv_reply_queue);
348 ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs)
352 LASSERT_SPIN_LOCKED(&rs->rs_service->srv_lock);
353 LASSERT_SPIN_LOCKED(&rs->rs_lock);
354 LASSERT (rs->rs_difficult);
355 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
357 if (rs->rs_scheduled) { /* being set up or already notified */
362 rs->rs_scheduled = 1;
363 cfs_list_del_init(&rs->rs_list);
364 ptlrpc_dispatch_difficult_reply(rs);
368 void ptlrpc_commit_replies(struct obd_export *exp)
370 struct ptlrpc_reply_state *rs, *nxt;
371 DECLARE_RS_BATCH(batch);
374 rs_batch_init(&batch);
375 /* Find any replies that have been committed and get their service
376 * to attend to complete them. */
378 /* CAVEAT EMPTOR: spinlock ordering!!! */
379 cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
380 cfs_list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
382 LASSERT (rs->rs_difficult);
383 /* VBR: per-export last_committed */
384 LASSERT(rs->rs_export);
385 if (rs->rs_transno <= exp->exp_last_committed) {
386 cfs_list_del_init(&rs->rs_obd_list);
387 rs_batch_add(&batch, rs);
390 cfs_spin_unlock(&exp->exp_uncommitted_replies_lock);
391 rs_batch_fini(&batch);
396 ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc)
398 struct ptlrpc_request_buffer_desc *rqbd;
403 cfs_spin_lock(&svc->srv_lock);
405 if (cfs_list_empty (&svc->srv_idle_rqbds)) {
406 cfs_spin_unlock(&svc->srv_lock);
410 rqbd = cfs_list_entry(svc->srv_idle_rqbds.next,
411 struct ptlrpc_request_buffer_desc,
413 cfs_list_del (&rqbd->rqbd_list);
415 /* assume we will post successfully */
416 svc->srv_nrqbd_receiving++;
417 cfs_list_add (&rqbd->rqbd_list, &svc->srv_active_rqbds);
419 cfs_spin_unlock(&svc->srv_lock);
421 rc = ptlrpc_register_rqbd(rqbd);
428 cfs_spin_lock(&svc->srv_lock);
430 svc->srv_nrqbd_receiving--;
431 cfs_list_del(&rqbd->rqbd_list);
432 cfs_list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
434 /* Don't complain if no request buffers are posted right now; LNET
435 * won't drop requests because we set the portal lazy! */
437 cfs_spin_unlock(&svc->srv_lock);
442 struct ptlrpc_service *ptlrpc_init_svc_conf(struct ptlrpc_service_conf *c,
443 svc_handler_t h, char *name,
444 struct proc_dir_entry *proc_entry,
445 svcreq_printfn_t prntfn,
448 return ptlrpc_init_svc(c->psc_nbufs, c->psc_bufsize,
449 c->psc_max_req_size, c->psc_max_reply_size,
450 c->psc_req_portal, c->psc_rep_portal,
451 c->psc_watchdog_factor,
453 prntfn, c->psc_min_threads, c->psc_max_threads,
454 threadname, c->psc_ctx_tags, NULL);
456 EXPORT_SYMBOL(ptlrpc_init_svc_conf);
458 static void ptlrpc_at_timer(unsigned long castmeharder)
460 struct ptlrpc_service *svc = (struct ptlrpc_service *)castmeharder;
461 svc->srv_at_check = 1;
462 svc->srv_at_checktime = cfs_time_current();
463 cfs_waitq_signal(&svc->srv_waitq);
466 /* @threadname should be 11 characters or less - 3 will be added on */
467 struct ptlrpc_service *
468 ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size, int max_reply_size,
469 int req_portal, int rep_portal, int watchdog_factor,
470 svc_handler_t handler, char *name,
471 cfs_proc_dir_entry_t *proc_entry,
472 svcreq_printfn_t svcreq_printfn,
473 int min_threads, int max_threads,
474 char *threadname, __u32 ctx_tags,
475 svc_hpreq_handler_t hp_handler)
478 struct ptlrpc_at_array *array;
479 struct ptlrpc_service *service;
480 unsigned int size, index;
484 LASSERT (bufsize >= max_req_size + SPTLRPC_MAX_PAYLOAD);
485 LASSERT (ctx_tags != 0);
487 OBD_ALLOC_PTR(service);
491 /* First initialise enough for early teardown */
493 service->srv_name = name;
494 cfs_spin_lock_init(&service->srv_lock);
495 CFS_INIT_LIST_HEAD(&service->srv_threads);
496 cfs_waitq_init(&service->srv_waitq);
498 service->srv_nbuf_per_group = test_req_buffer_pressure ? 1 : nbufs;
499 service->srv_max_req_size = max_req_size + SPTLRPC_MAX_PAYLOAD;
500 service->srv_buf_size = bufsize;
501 service->srv_rep_portal = rep_portal;
502 service->srv_req_portal = req_portal;
503 service->srv_watchdog_factor = watchdog_factor;
504 service->srv_handler = handler;
505 service->srv_request_history_print_fn = svcreq_printfn;
506 service->srv_request_seq = 1; /* valid seq #s start at 1 */
507 service->srv_request_max_cull_seq = 0;
508 service->srv_threads_min = min_threads;
509 service->srv_threads_max = max_threads;
510 service->srv_thread_name = threadname;
511 service->srv_ctx_tags = ctx_tags;
512 service->srv_hpreq_handler = hp_handler;
513 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
514 service->srv_hpreq_count = 0;
515 service->srv_n_hpreq = 0;
517 rc = LNetSetLazyPortal(service->srv_req_portal);
520 CFS_INIT_LIST_HEAD(&service->srv_request_queue);
521 CFS_INIT_LIST_HEAD(&service->srv_request_hpq);
522 CFS_INIT_LIST_HEAD(&service->srv_idle_rqbds);
523 CFS_INIT_LIST_HEAD(&service->srv_active_rqbds);
524 CFS_INIT_LIST_HEAD(&service->srv_history_rqbds);
525 CFS_INIT_LIST_HEAD(&service->srv_request_history);
526 CFS_INIT_LIST_HEAD(&service->srv_active_replies);
528 CFS_INIT_LIST_HEAD(&service->srv_reply_queue);
530 CFS_INIT_LIST_HEAD(&service->srv_free_rs_list);
531 cfs_waitq_init(&service->srv_free_rs_waitq);
532 cfs_atomic_set(&service->srv_n_difficult_replies, 0);
534 cfs_spin_lock_init(&service->srv_at_lock);
535 CFS_INIT_LIST_HEAD(&service->srv_req_in_queue);
537 array = &service->srv_at_array;
538 size = at_est2timeout(at_max);
539 array->paa_size = size;
540 array->paa_count = 0;
541 array->paa_deadline = -1;
543 /* allocate memory for srv_at_array (ptlrpc_at_array) */
544 OBD_ALLOC(array->paa_reqs_array, sizeof(cfs_list_t) * size);
545 if (array->paa_reqs_array == NULL)
548 for (index = 0; index < size; index++)
549 CFS_INIT_LIST_HEAD(&array->paa_reqs_array[index]);
551 OBD_ALLOC(array->paa_reqs_count, sizeof(__u32) * size);
552 if (array->paa_reqs_count == NULL)
555 cfs_timer_init(&service->srv_at_timer, ptlrpc_at_timer, service);
556 /* At SOW, service time should be quick; 10s seems generous. If client
557 timeout is less than this, we'll be sending an early reply. */
558 at_init(&service->srv_at_estimate, 10, 0);
560 cfs_spin_lock (&ptlrpc_all_services_lock);
561 cfs_list_add (&service->srv_list, &ptlrpc_all_services);
562 cfs_spin_unlock (&ptlrpc_all_services_lock);
564 /* Now allocate the request buffers */
565 rc = ptlrpc_grow_req_bufs(service);
566 /* We shouldn't be under memory pressure at startup, so
567 * fail if we can't post all our buffers at this time. */
571 /* Now allocate pool of reply buffers */
572 /* Increase max reply size to next power of two */
573 service->srv_max_reply_size = 1;
574 while (service->srv_max_reply_size <
575 max_reply_size + SPTLRPC_MAX_PAYLOAD)
576 service->srv_max_reply_size <<= 1;
578 if (proc_entry != NULL)
579 ptlrpc_lprocfs_register_service(proc_entry, service);
581 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
582 service->srv_name, service->srv_req_portal);
586 ptlrpc_unregister_service(service);
591 * to actually free the request, must be called without holding svc_lock.
592 * note it's caller's responsibility to unlink req->rq_list.
594 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
596 LASSERT(cfs_atomic_read(&req->rq_refcount) == 0);
597 LASSERT(cfs_list_empty(&req->rq_timed_list));
599 /* DEBUG_REQ() assumes the reply state of a request with a valid
600 * ref will not be destroyed until that reference is dropped. */
601 ptlrpc_req_drop_rs(req);
603 sptlrpc_svc_ctx_decref(req);
605 if (req != &req->rq_rqbd->rqbd_req) {
606 /* NB request buffers use an embedded
607 * req if the incoming req unlinked the
608 * MD; this isn't one of them! */
609 OBD_FREE(req, sizeof(*req));
614 * increment the number of active requests consuming service threads.
616 void ptlrpc_server_active_request_inc(struct ptlrpc_request *req)
618 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
619 struct ptlrpc_service *svc = rqbd->rqbd_service;
621 cfs_spin_lock(&svc->srv_lock);
622 svc->srv_n_active_reqs++;
623 cfs_spin_unlock(&svc->srv_lock);
627 * decrement the number of active requests consuming service threads.
629 void ptlrpc_server_active_request_dec(struct ptlrpc_request *req)
631 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
632 struct ptlrpc_service *svc = rqbd->rqbd_service;
634 cfs_spin_lock(&svc->srv_lock);
635 svc->srv_n_active_reqs--;
636 cfs_spin_unlock(&svc->srv_lock);
640 * drop a reference count of the request. if it reaches 0, we either
641 * put it into history list, or free it immediately.
643 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
645 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
646 struct ptlrpc_service *svc = rqbd->rqbd_service;
651 if (!cfs_atomic_dec_and_test(&req->rq_refcount))
654 cfs_spin_lock(&svc->srv_at_lock);
655 if (req->rq_at_linked) {
656 struct ptlrpc_at_array *array = &svc->srv_at_array;
657 __u32 index = req->rq_at_index;
659 LASSERT(!cfs_list_empty(&req->rq_timed_list));
660 cfs_list_del_init(&req->rq_timed_list);
661 req->rq_at_linked = 0;
662 array->paa_reqs_count[index]--;
665 LASSERT(cfs_list_empty(&req->rq_timed_list));
666 cfs_spin_unlock(&svc->srv_at_lock);
668 /* finalize request */
669 if (req->rq_export) {
670 class_export_put(req->rq_export);
671 req->rq_export = NULL;
674 cfs_spin_lock(&svc->srv_lock);
676 svc->srv_n_active_reqs--;
677 cfs_list_add(&req->rq_list, &rqbd->rqbd_reqs);
679 refcount = --(rqbd->rqbd_refcount);
681 /* request buffer is now idle: add to history */
682 cfs_list_del(&rqbd->rqbd_list);
683 cfs_list_add_tail(&rqbd->rqbd_list, &svc->srv_history_rqbds);
684 svc->srv_n_history_rqbds++;
686 /* cull some history?
687 * I expect only about 1 or 2 rqbds need to be recycled here */
688 while (svc->srv_n_history_rqbds > svc->srv_max_history_rqbds) {
689 rqbd = cfs_list_entry(svc->srv_history_rqbds.next,
690 struct ptlrpc_request_buffer_desc,
693 cfs_list_del(&rqbd->rqbd_list);
694 svc->srv_n_history_rqbds--;
696 /* remove rqbd's reqs from svc's req history while
697 * I've got the service lock */
698 cfs_list_for_each(tmp, &rqbd->rqbd_reqs) {
699 req = cfs_list_entry(tmp, struct ptlrpc_request,
701 /* Track the highest culled req seq */
702 if (req->rq_history_seq >
703 svc->srv_request_max_cull_seq)
704 svc->srv_request_max_cull_seq =
706 cfs_list_del(&req->rq_history_list);
709 cfs_spin_unlock(&svc->srv_lock);
711 cfs_list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
712 req = cfs_list_entry(rqbd->rqbd_reqs.next,
713 struct ptlrpc_request,
715 cfs_list_del(&req->rq_list);
716 ptlrpc_server_free_request(req);
719 cfs_spin_lock(&svc->srv_lock);
721 * now all reqs including the embedded req has been
722 * disposed, schedule request buffer for re-use.
724 LASSERT(cfs_atomic_read(&rqbd->rqbd_req.rq_refcount) ==
726 cfs_list_add_tail(&rqbd->rqbd_list,
727 &svc->srv_idle_rqbds);
730 cfs_spin_unlock(&svc->srv_lock);
731 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
732 /* If we are low on memory, we are not interested in history */
733 cfs_list_del(&req->rq_list);
734 cfs_list_del_init(&req->rq_history_list);
735 cfs_spin_unlock(&svc->srv_lock);
737 ptlrpc_server_free_request(req);
739 cfs_spin_unlock(&svc->srv_lock);
744 * to finish a request: stop sending more early replies, and release
745 * the request. should be called after we finished handling the request.
747 static void ptlrpc_server_finish_request(struct ptlrpc_request *req)
749 ptlrpc_server_drop_request(req);
752 /* This function makes sure dead exports are evicted in a timely manner.
753 This function is only called when some export receives a message (i.e.,
754 the network is up.) */
755 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
757 struct obd_export *oldest_exp;
758 time_t oldest_time, new_time;
764 /* Compensate for slow machines, etc, by faking our request time
765 into the future. Although this can break the strict time-ordering
766 of the list, we can be really lazy here - we don't have to evict
767 at the exact right moment. Eventually, all silent exports
768 will make it to the top of the list. */
770 /* Do not pay attention on 1sec or smaller renewals. */
771 new_time = cfs_time_current_sec() + extra_delay;
772 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
775 exp->exp_last_request_time = new_time;
776 CDEBUG(D_HA, "updating export %s at "CFS_TIME_T" exp %p\n",
777 exp->exp_client_uuid.uuid,
778 exp->exp_last_request_time, exp);
780 /* exports may get disconnected from the chain even though the
781 export has references, so we must keep the spin lock while
782 manipulating the lists */
783 cfs_spin_lock(&exp->exp_obd->obd_dev_lock);
785 if (cfs_list_empty(&exp->exp_obd_chain_timed)) {
786 /* this one is not timed */
787 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
791 cfs_list_move_tail(&exp->exp_obd_chain_timed,
792 &exp->exp_obd->obd_exports_timed);
794 oldest_exp = cfs_list_entry(exp->exp_obd->obd_exports_timed.next,
795 struct obd_export, exp_obd_chain_timed);
796 oldest_time = oldest_exp->exp_last_request_time;
797 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
799 if (exp->exp_obd->obd_recovering) {
800 /* be nice to everyone during recovery */
805 /* Note - racing to start/reset the obd_eviction timer is safe */
806 if (exp->exp_obd->obd_eviction_timer == 0) {
807 /* Check if the oldest entry is expired. */
808 if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
810 /* We need a second timer, in case the net was down and
811 * it just came back. Since the pinger may skip every
812 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
813 * we better wait for 3. */
814 exp->exp_obd->obd_eviction_timer =
815 cfs_time_current_sec() + 3 * PING_INTERVAL;
816 CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
817 exp->exp_obd->obd_name,
818 obd_export_nid2str(oldest_exp), oldest_time);
821 if (cfs_time_current_sec() >
822 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
823 /* The evictor won't evict anyone who we've heard from
824 * recently, so we don't have to check before we start
826 if (!ping_evictor_wake(exp))
827 exp->exp_obd->obd_eviction_timer = 0;
834 static int ptlrpc_check_req(struct ptlrpc_request *req)
836 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
837 req->rq_export->exp_conn_cnt)) {
838 DEBUG_REQ(D_ERROR, req,
839 "DROPPING req from old connection %d < %d",
840 lustre_msg_get_conn_cnt(req->rq_reqmsg),
841 req->rq_export->exp_conn_cnt);
844 if (unlikely(req->rq_export->exp_obd &&
845 req->rq_export->exp_obd->obd_fail)) {
846 /* Failing over, don't handle any more reqs, send
847 error response instead. */
848 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
849 req, req->rq_export->exp_obd->obd_name);
850 req->rq_status = -ENODEV;
858 static void ptlrpc_at_set_timer(struct ptlrpc_service *svc)
860 struct ptlrpc_at_array *array = &svc->srv_at_array;
863 cfs_spin_lock(&svc->srv_at_lock);
864 if (array->paa_count == 0) {
865 cfs_timer_disarm(&svc->srv_at_timer);
866 cfs_spin_unlock(&svc->srv_at_lock);
870 /* Set timer for closest deadline */
871 next = (__s32)(array->paa_deadline - cfs_time_current_sec() -
874 ptlrpc_at_timer((unsigned long)svc);
876 cfs_timer_arm(&svc->srv_at_timer, cfs_time_shift(next));
877 cfs_spin_unlock(&svc->srv_at_lock);
878 CDEBUG(D_INFO, "armed %s at %+ds\n", svc->srv_name, next);
881 /* Add rpc to early reply check list */
882 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
884 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
885 struct ptlrpc_request *rq = NULL;
886 struct ptlrpc_at_array *array = &svc->srv_at_array;
893 if (req->rq_no_reply)
896 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
899 cfs_spin_lock(&svc->srv_at_lock);
900 LASSERT(cfs_list_empty(&req->rq_timed_list));
902 index = (unsigned long)req->rq_deadline % array->paa_size;
903 if (array->paa_reqs_count[index] > 0) {
904 /* latest rpcs will have the latest deadlines in the list,
905 * so search backward. */
906 cfs_list_for_each_entry_reverse(rq,
907 &array->paa_reqs_array[index],
909 if (req->rq_deadline >= rq->rq_deadline) {
910 cfs_list_add(&req->rq_timed_list,
917 /* Add the request at the head of the list */
918 if (cfs_list_empty(&req->rq_timed_list))
919 cfs_list_add(&req->rq_timed_list,
920 &array->paa_reqs_array[index]);
922 req->rq_at_linked = 1;
923 req->rq_at_index = index;
924 array->paa_reqs_count[index]++;
926 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
927 array->paa_deadline = req->rq_deadline;
930 cfs_spin_unlock(&svc->srv_at_lock);
933 ptlrpc_at_set_timer(svc);
938 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
940 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
941 struct ptlrpc_request *reqcopy;
942 struct lustre_msg *reqmsg;
943 cfs_duration_t olddl = req->rq_deadline - cfs_time_current_sec();
948 /* deadline is when the client expects us to reply, margin is the
949 difference between clients' and servers' expectations */
950 DEBUG_REQ(D_ADAPTTO, req,
951 "%ssending early reply (deadline %+lds, margin %+lds) for "
952 "%d+%d", AT_OFF ? "AT off - not " : "",
953 olddl, olddl - at_get(&svc->srv_at_estimate),
954 at_get(&svc->srv_at_estimate), at_extra);
960 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), "
961 "not sending early reply. Consider increasing "
962 "at_early_margin (%d)?", olddl, at_early_margin);
964 /* Return an error so we're not re-added to the timed list. */
968 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
969 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
970 "but no AT support");
974 if (req->rq_export &&
975 lustre_msg_get_flags(req->rq_reqmsg) &
976 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
978 * Use at_extra as early reply period for recovery requests but
979 * make sure it is not bigger than recovery time / 4
981 at_add(&svc->srv_at_estimate,
983 req->rq_export->exp_obd->obd_recovery_timeout / 4));
985 /* Fake our processing time into the future to ask the clients
986 * for some extra amount of time */
987 at_add(&svc->srv_at_estimate, at_extra);
990 newdl = cfs_time_current_sec() + at_get(&svc->srv_at_estimate);
991 if (req->rq_deadline >= newdl) {
992 /* We're not adding any time, no need to send an early reply
993 (e.g. maybe at adaptive_max) */
994 DEBUG_REQ(D_WARNING, req, "Couldn't add any time ("
995 CFS_DURATION_T"/"CFS_DURATION_T"), "
996 "not sending early reply\n", olddl,
997 cfs_time_sub(newdl, cfs_time_current_sec()));
1001 OBD_ALLOC(reqcopy, sizeof *reqcopy);
1002 if (reqcopy == NULL)
1004 OBD_ALLOC(reqmsg, req->rq_reqlen);
1006 OBD_FREE(reqcopy, sizeof *reqcopy);
1011 reqcopy->rq_reply_state = NULL;
1012 reqcopy->rq_rep_swab_mask = 0;
1013 reqcopy->rq_pack_bulk = 0;
1014 reqcopy->rq_pack_udesc = 0;
1015 reqcopy->rq_packed_final = 0;
1016 sptlrpc_svc_ctx_addref(reqcopy);
1017 /* We only need the reqmsg for the magic */
1018 reqcopy->rq_reqmsg = reqmsg;
1019 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1021 LASSERT(cfs_atomic_read(&req->rq_refcount));
1022 /** if it is last refcount then early reply isn't needed */
1023 if (cfs_atomic_read(&req->rq_refcount) == 1) {
1024 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1025 "abort sending early reply\n");
1026 GOTO(out, rc = -EINVAL);
1029 /* Connection ref */
1030 reqcopy->rq_export = class_conn2export(
1031 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1032 if (reqcopy->rq_export == NULL)
1033 GOTO(out, rc = -ENODEV);
1036 class_export_rpc_get(reqcopy->rq_export);
1037 if (reqcopy->rq_export->exp_obd &&
1038 reqcopy->rq_export->exp_obd->obd_fail)
1039 GOTO(out_put, rc = -ENODEV);
1041 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1045 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1048 /* Adjust our own deadline to what we told the client */
1049 req->rq_deadline = newdl;
1050 req->rq_early_count++; /* number sent, server side */
1052 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1055 /* Free the (early) reply state from lustre_pack_reply.
1056 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1057 ptlrpc_req_drop_rs(reqcopy);
1060 class_export_rpc_put(reqcopy->rq_export);
1061 class_export_put(reqcopy->rq_export);
1063 sptlrpc_svc_ctx_decref(reqcopy);
1064 OBD_FREE(reqmsg, req->rq_reqlen);
1065 OBD_FREE(reqcopy, sizeof *reqcopy);
1069 /* Send early replies to everybody expiring within at_early_margin
1070 asking for at_extra time */
1071 static int ptlrpc_at_check_timed(struct ptlrpc_service *svc)
1073 struct ptlrpc_request *rq, *n;
1074 cfs_list_t work_list;
1075 struct ptlrpc_at_array *array = &svc->srv_at_array;
1078 time_t now = cfs_time_current_sec();
1079 cfs_duration_t delay;
1080 int first, counter = 0;
1083 cfs_spin_lock(&svc->srv_at_lock);
1084 if (svc->srv_at_check == 0) {
1085 cfs_spin_unlock(&svc->srv_at_lock);
1088 delay = cfs_time_sub(cfs_time_current(), svc->srv_at_checktime);
1089 svc->srv_at_check = 0;
1091 if (array->paa_count == 0) {
1092 cfs_spin_unlock(&svc->srv_at_lock);
1096 /* The timer went off, but maybe the nearest rpc already completed. */
1097 first = array->paa_deadline - now;
1098 if (first > at_early_margin) {
1099 /* We've still got plenty of time. Reset the timer. */
1100 cfs_spin_unlock(&svc->srv_at_lock);
1101 ptlrpc_at_set_timer(svc);
1105 /* We're close to a timeout, and we don't know how much longer the
1106 server will take. Send early replies to everyone expiring soon. */
1107 CFS_INIT_LIST_HEAD(&work_list);
1109 index = (unsigned long)array->paa_deadline % array->paa_size;
1110 count = array->paa_count;
1112 count -= array->paa_reqs_count[index];
1113 cfs_list_for_each_entry_safe(rq, n,
1114 &array->paa_reqs_array[index],
1116 if (rq->rq_deadline <= now + at_early_margin) {
1117 cfs_list_del_init(&rq->rq_timed_list);
1119 * ptlrpc_server_drop_request() may drop
1120 * refcount to 0 already. Let's check this and
1121 * don't add entry to work_list
1123 if (likely(cfs_atomic_inc_not_zero(&rq->rq_refcount)))
1124 cfs_list_add(&rq->rq_timed_list, &work_list);
1126 array->paa_reqs_count[index]--;
1128 rq->rq_at_linked = 0;
1132 /* update the earliest deadline */
1133 if (deadline == -1 || rq->rq_deadline < deadline)
1134 deadline = rq->rq_deadline;
1139 if (++index >= array->paa_size)
1142 array->paa_deadline = deadline;
1143 cfs_spin_unlock(&svc->srv_at_lock);
1145 /* we have a new earliest deadline, restart the timer */
1146 ptlrpc_at_set_timer(svc);
1148 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1149 "replies\n", first, at_extra, counter);
1151 /* We're already past request deadlines before we even get a
1152 chance to send early replies */
1153 LCONSOLE_WARN("%s: This server is not able to keep up with "
1154 "request traffic (cpu-bound).\n", svc->srv_name);
1155 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
1156 "delay="CFS_DURATION_T"(jiff)\n",
1157 counter, svc->srv_n_queued_reqs, svc->srv_n_active_reqs,
1158 at_get(&svc->srv_at_estimate), delay);
1161 /* we took additional refcount so entries can't be deleted from list, no
1162 * locking is needed */
1163 while (!cfs_list_empty(&work_list)) {
1164 rq = cfs_list_entry(work_list.next, struct ptlrpc_request,
1166 cfs_list_del_init(&rq->rq_timed_list);
1168 if (ptlrpc_at_send_early_reply(rq) == 0)
1169 ptlrpc_at_add_timed(rq);
1171 ptlrpc_server_drop_request(rq);
1178 * Put the request to the export list if the request may become
1179 * a high priority one.
1181 static int ptlrpc_hpreq_init(struct ptlrpc_service *svc,
1182 struct ptlrpc_request *req)
1187 if (svc->srv_hpreq_handler) {
1188 rc = svc->srv_hpreq_handler(req);
1192 if (req->rq_export && req->rq_ops) {
1193 cfs_spin_lock(&req->rq_export->exp_lock);
1194 cfs_list_add(&req->rq_exp_list,
1195 &req->rq_export->exp_queued_rpc);
1196 cfs_spin_unlock(&req->rq_export->exp_lock);
1202 /** Remove the request from the export list. */
1203 static void ptlrpc_hpreq_fini(struct ptlrpc_request *req)
1206 if (req->rq_export && req->rq_ops) {
1207 cfs_spin_lock(&req->rq_export->exp_lock);
1208 cfs_list_del_init(&req->rq_exp_list);
1209 cfs_spin_unlock(&req->rq_export->exp_lock);
1215 * Make the request a high priority one.
1217 * All the high priority requests are queued in a separate FIFO
1218 * ptlrpc_service::srv_request_hpq list which is parallel to
1219 * ptlrpc_service::srv_request_queue list but has a higher priority
1222 * \see ptlrpc_server_handle_request().
1224 static void ptlrpc_hpreq_reorder_nolock(struct ptlrpc_service *svc,
1225 struct ptlrpc_request *req)
1228 LASSERT(svc != NULL);
1229 cfs_spin_lock(&req->rq_lock);
1230 if (req->rq_hp == 0) {
1231 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1233 /* Add to the high priority queue. */
1234 cfs_list_move_tail(&req->rq_list, &svc->srv_request_hpq);
1236 if (opc != OBD_PING)
1237 DEBUG_REQ(D_NET, req, "high priority req");
1239 cfs_spin_unlock(&req->rq_lock);
1243 void ptlrpc_hpreq_reorder(struct ptlrpc_request *req)
1245 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
1248 cfs_spin_lock(&svc->srv_lock);
1249 /* It may happen that the request is already taken for the processing
1250 * but still in the export list, do not re-add it into the HP list. */
1251 if (req->rq_phase == RQ_PHASE_NEW)
1252 ptlrpc_hpreq_reorder_nolock(svc, req);
1253 cfs_spin_unlock(&svc->srv_lock);
1257 /** Check if the request is a high priority one. */
1258 static int ptlrpc_server_hpreq_check(struct ptlrpc_request *req)
1263 /* Check by request opc. */
1264 opc = lustre_msg_get_opc(req->rq_reqmsg);
1265 if (opc == OBD_PING)
1268 /* Perform request specific check. */
1269 if (req->rq_ops && req->rq_ops->hpreq_check)
1270 rc = req->rq_ops->hpreq_check(req);
1274 /** Check if a request is a high priority one. */
1275 static int ptlrpc_server_request_add(struct ptlrpc_service *svc,
1276 struct ptlrpc_request *req)
1281 rc = ptlrpc_server_hpreq_check(req);
1285 cfs_spin_lock(&svc->srv_lock);
1286 /* Before inserting the request into the queue, check if it is not
1287 * inserted yet, or even already handled -- it may happen due to
1288 * a racing ldlm_server_blocking_ast(). */
1289 if (req->rq_phase == RQ_PHASE_NEW && cfs_list_empty(&req->rq_list)) {
1291 ptlrpc_hpreq_reorder_nolock(svc, req);
1293 cfs_list_add_tail(&req->rq_list,
1294 &svc->srv_request_queue);
1296 cfs_spin_unlock(&svc->srv_lock);
1301 /* Only allow normal priority requests on a service that has a high-priority
1302 * queue if forced (i.e. cleanup), if there are other high priority requests
1303 * already being processed (i.e. those threads can service more high-priority
1304 * requests), or if there are enough idle threads that a later thread can do
1305 * a high priority request. */
1306 static int ptlrpc_server_allow_normal(struct ptlrpc_service *svc, int force)
1308 return force || !svc->srv_hpreq_handler || svc->srv_n_hpreq > 0 ||
1309 svc->srv_n_active_reqs < svc->srv_threads_running - 2;
1312 static struct ptlrpc_request *
1313 ptlrpc_server_request_get(struct ptlrpc_service *svc, int force)
1315 struct ptlrpc_request *req = NULL;
1318 if (ptlrpc_server_allow_normal(svc, force) &&
1319 !cfs_list_empty(&svc->srv_request_queue) &&
1320 (cfs_list_empty(&svc->srv_request_hpq) ||
1321 svc->srv_hpreq_count >= svc->srv_hpreq_ratio)) {
1322 req = cfs_list_entry(svc->srv_request_queue.next,
1323 struct ptlrpc_request, rq_list);
1324 svc->srv_hpreq_count = 0;
1325 } else if (!cfs_list_empty(&svc->srv_request_hpq)) {
1326 req = cfs_list_entry(svc->srv_request_hpq.next,
1327 struct ptlrpc_request, rq_list);
1328 svc->srv_hpreq_count++;
1333 static int ptlrpc_server_request_pending(struct ptlrpc_service *svc, int force)
1335 return ((ptlrpc_server_allow_normal(svc, force) &&
1336 !cfs_list_empty(&svc->srv_request_queue)) ||
1337 !cfs_list_empty(&svc->srv_request_hpq));
1340 /* Handle freshly incoming reqs, add to timed early reply list,
1341 pass on to regular request queue */
1343 ptlrpc_server_handle_req_in(struct ptlrpc_service *svc)
1345 struct ptlrpc_request *req;
1352 cfs_spin_lock(&svc->srv_lock);
1353 if (cfs_list_empty(&svc->srv_req_in_queue)) {
1354 cfs_spin_unlock(&svc->srv_lock);
1358 req = cfs_list_entry(svc->srv_req_in_queue.next,
1359 struct ptlrpc_request, rq_list);
1360 cfs_list_del_init (&req->rq_list);
1361 /* Consider this still a "queued" request as far as stats are
1363 cfs_spin_unlock(&svc->srv_lock);
1365 /* go through security check/transform */
1366 rc = sptlrpc_svc_unwrap_request(req);
1370 case SECSVC_COMPLETE:
1371 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1380 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1381 * redo it wouldn't be harmful.
1383 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1384 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1386 CERROR("error unpacking request: ptl %d from %s "
1387 "x"LPU64"\n", svc->srv_req_portal,
1388 libcfs_id2str(req->rq_peer), req->rq_xid);
1393 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1395 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1396 LPU64"\n", svc->srv_req_portal,
1397 libcfs_id2str(req->rq_peer), req->rq_xid);
1401 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1402 lustre_msg_get_opc(req->rq_reqmsg) == obd_fail_val) {
1403 CERROR("drop incoming rpc opc %u, x"LPU64"\n",
1404 obd_fail_val, req->rq_xid);
1409 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1410 CERROR("wrong packet type received (type=%u) from %s\n",
1411 lustre_msg_get_type(req->rq_reqmsg),
1412 libcfs_id2str(req->rq_peer));
1416 switch(lustre_msg_get_opc(req->rq_reqmsg)) {
1419 req->rq_bulk_write = 1;
1423 req->rq_bulk_read = 1;
1427 CDEBUG(D_NET, "got req "LPU64"\n", req->rq_xid);
1429 req->rq_export = class_conn2export(
1430 lustre_msg_get_handle(req->rq_reqmsg));
1431 if (req->rq_export) {
1432 rc = ptlrpc_check_req(req);
1434 rc = sptlrpc_target_export_check(req->rq_export, req);
1436 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1437 "illegal security flavor,");
1442 ptlrpc_update_export_timer(req->rq_export, 0);
1445 /* req_in handling should/must be fast */
1446 if (cfs_time_current_sec() - req->rq_arrival_time.tv_sec > 5)
1447 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1448 cfs_time_sub(cfs_time_current_sec(),
1449 req->rq_arrival_time.tv_sec));
1451 /* Set rpc server deadline and add it to the timed list */
1452 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1453 MSGHDR_AT_SUPPORT) ?
1454 /* The max time the client expects us to take */
1455 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1456 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1457 if (unlikely(deadline == 0)) {
1458 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1462 ptlrpc_at_add_timed(req);
1463 rc = ptlrpc_hpreq_init(svc, req);
1467 /* Move it over to the request processing queue */
1468 rc = ptlrpc_server_request_add(svc, req);
1471 cfs_waitq_signal(&svc->srv_waitq);
1475 cfs_spin_lock(&svc->srv_lock);
1476 svc->srv_n_queued_reqs--;
1477 svc->srv_n_active_reqs++;
1478 cfs_spin_unlock(&svc->srv_lock);
1479 ptlrpc_server_finish_request(req);
1485 ptlrpc_server_handle_request(struct ptlrpc_service *svc,
1486 struct ptlrpc_thread *thread)
1488 struct obd_export *export = NULL;
1489 struct ptlrpc_request *request;
1490 struct timeval work_start;
1491 struct timeval work_end;
1499 cfs_spin_lock(&svc->srv_lock);
1500 if (unlikely(!ptlrpc_server_request_pending(svc, 0) ||
1503 /* !@%$# liblustre only has 1 thread */
1504 cfs_atomic_read(&svc->srv_n_difficult_replies) != 0 &&
1506 svc->srv_n_active_reqs >= (svc->srv_threads_running - 1)))) {
1507 /* Don't handle regular requests in the last thread, in order * re
1508 * to handle difficult replies (which might block other threads)
1509 * as well as handle any incoming reqs, early replies, etc.
1510 * That means we always need at least 2 service threads. */
1511 cfs_spin_unlock(&svc->srv_lock);
1515 request = ptlrpc_server_request_get(svc, 0);
1516 if (request == NULL) {
1517 cfs_spin_unlock(&svc->srv_lock);
1521 opc = lustre_msg_get_opc(request->rq_reqmsg);
1522 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1523 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1524 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1525 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1527 if (unlikely(fail_opc)) {
1528 if (request->rq_export && request->rq_ops) {
1529 cfs_spin_unlock(&svc->srv_lock);
1530 OBD_FAIL_TIMEOUT(fail_opc, 4);
1531 cfs_spin_lock(&svc->srv_lock);
1532 request = ptlrpc_server_request_get(svc, 0);
1533 if (request == NULL) {
1534 cfs_spin_unlock(&svc->srv_lock);
1537 LASSERT(ptlrpc_server_request_pending(svc, 0));
1541 cfs_list_del_init(&request->rq_list);
1542 svc->srv_n_queued_reqs--;
1543 svc->srv_n_active_reqs++;
1547 /* The phase is changed under the lock here because we need to know
1548 * the request is under processing (see ptlrpc_hpreq_reorder()). */
1549 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1550 cfs_spin_unlock(&svc->srv_lock);
1552 ptlrpc_hpreq_fini(request);
1554 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1555 libcfs_debug_dumplog();
1557 cfs_gettimeofday(&work_start);
1558 timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
1559 if (likely(svc->srv_stats != NULL)) {
1560 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1562 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1563 svc->srv_n_queued_reqs);
1564 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1565 svc->srv_n_active_reqs);
1566 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1567 at_get(&svc->srv_at_estimate));
1570 rc = lu_context_init(&request->rq_session,
1571 LCT_SESSION|LCT_REMEMBER|LCT_NOREF);
1573 CERROR("Failure to initialize session: %d\n", rc);
1576 request->rq_session.lc_thread = thread;
1577 request->rq_session.lc_cookie = 0x5;
1578 lu_context_enter(&request->rq_session);
1580 CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
1582 request->rq_svc_thread = thread;
1584 request->rq_svc_thread->t_env->le_ses = &request->rq_session;
1586 if (likely(request->rq_export)) {
1587 if (unlikely(ptlrpc_check_req(request)))
1589 ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
1590 export = class_export_rpc_get(request->rq_export);
1593 /* Discard requests queued for longer than the deadline.
1594 The deadline is increased if we send an early reply. */
1595 if (cfs_time_current_sec() > request->rq_deadline) {
1596 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s"
1597 ": deadline "CFS_DURATION_T":"CFS_DURATION_T"s ago\n",
1598 libcfs_id2str(request->rq_peer),
1599 cfs_time_sub(request->rq_deadline,
1600 request->rq_arrival_time.tv_sec),
1601 cfs_time_sub(cfs_time_current_sec(),
1602 request->rq_deadline));
1603 goto put_rpc_export;
1606 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
1607 "%s:%s+%d:%d:x"LPU64":%s:%d\n", cfs_curproc_comm(),
1608 (request->rq_export ?
1609 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1610 (request->rq_export ?
1611 cfs_atomic_read(&request->rq_export->exp_refcount) : -99),
1612 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1613 libcfs_id2str(request->rq_peer),
1614 lustre_msg_get_opc(request->rq_reqmsg));
1616 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1617 OBD_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, obd_fail_val);
1619 rc = svc->srv_handler(request);
1621 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1625 class_export_rpc_put(export);
1627 lu_context_exit(&request->rq_session);
1628 lu_context_fini(&request->rq_session);
1630 if (unlikely(cfs_time_current_sec() > request->rq_deadline)) {
1631 DEBUG_REQ(D_WARNING, request, "Request x"LPU64" took longer "
1632 "than estimated ("CFS_DURATION_T":"CFS_DURATION_T"s);"
1633 " client may timeout.",
1634 request->rq_xid, cfs_time_sub(request->rq_deadline,
1635 request->rq_arrival_time.tv_sec),
1636 cfs_time_sub(cfs_time_current_sec(),
1637 request->rq_deadline));
1640 cfs_gettimeofday(&work_end);
1641 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
1642 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
1643 "%s:%s+%d:%d:x"LPU64":%s:%d Request procesed in "
1644 "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
1646 (request->rq_export ?
1647 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1648 (request->rq_export ?
1649 cfs_atomic_read(&request->rq_export->exp_refcount) : -99),
1650 lustre_msg_get_status(request->rq_reqmsg),
1652 libcfs_id2str(request->rq_peer),
1653 lustre_msg_get_opc(request->rq_reqmsg),
1655 cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
1656 (request->rq_repmsg ?
1657 lustre_msg_get_transno(request->rq_repmsg) :
1658 request->rq_transno),
1660 (request->rq_repmsg ?
1661 lustre_msg_get_status(request->rq_repmsg) : -999));
1662 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
1663 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
1664 int opc = opcode_offset(op);
1665 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
1666 LASSERT(opc < LUSTRE_MAX_OPCODES);
1667 lprocfs_counter_add(svc->srv_stats,
1668 opc + EXTRA_MAX_OPCODES,
1672 if (unlikely(request->rq_early_count)) {
1673 DEBUG_REQ(D_ADAPTTO, request,
1674 "sent %d early replies before finishing in "
1676 request->rq_early_count,
1677 cfs_time_sub(work_end.tv_sec,
1678 request->rq_arrival_time.tv_sec));
1682 cfs_spin_lock(&svc->srv_lock);
1685 cfs_spin_unlock(&svc->srv_lock);
1686 ptlrpc_server_finish_request(request);
1692 * An internal function to process a single reply state object.
1695 ptlrpc_handle_rs (struct ptlrpc_reply_state *rs)
1697 struct ptlrpc_service *svc = rs->rs_service;
1698 struct obd_export *exp;
1699 struct obd_device *obd;
1704 exp = rs->rs_export;
1707 LASSERT (rs->rs_difficult);
1708 LASSERT (rs->rs_scheduled);
1709 LASSERT (cfs_list_empty(&rs->rs_list));
1711 cfs_spin_lock (&exp->exp_lock);
1712 /* Noop if removed already */
1713 cfs_list_del_init (&rs->rs_exp_list);
1714 cfs_spin_unlock (&exp->exp_lock);
1716 /* The disk commit callback holds exp_uncommitted_replies_lock while it
1717 * iterates over newly committed replies, removing them from
1718 * exp_uncommitted_replies. It then drops this lock and schedules the
1719 * replies it found for handling here.
1721 * We can avoid contention for exp_uncommitted_replies_lock between the
1722 * HRT threads and further commit callbacks by checking rs_committed
1723 * which is set in the commit callback while it holds both
1724 * rs_lock and exp_uncommitted_reples.
1726 * If we see rs_committed clear, the commit callback _may_ not have
1727 * handled this reply yet and we race with it to grab
1728 * exp_uncommitted_replies_lock before removing the reply from
1729 * exp_uncommitted_replies. Note that if we lose the race and the
1730 * reply has already been removed, list_del_init() is a noop.
1732 * If we see rs_committed set, we know the commit callback is handling,
1733 * or has handled this reply since store reordering might allow us to
1734 * see rs_committed set out of sequence. But since this is done
1735 * holding rs_lock, we can be sure it has all completed once we hold
1736 * rs_lock, which we do right next.
1738 if (!rs->rs_committed) {
1739 cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
1740 cfs_list_del_init(&rs->rs_obd_list);
1741 cfs_spin_unlock(&exp->exp_uncommitted_replies_lock);
1744 cfs_spin_lock(&rs->rs_lock);
1746 been_handled = rs->rs_handled;
1749 nlocks = rs->rs_nlocks; /* atomic "steal", but */
1750 rs->rs_nlocks = 0; /* locks still on rs_locks! */
1752 if (nlocks == 0 && !been_handled) {
1753 /* If we see this, we should already have seen the warning
1754 * in mds_steal_ack_locks() */
1755 CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
1758 rs->rs_xid, rs->rs_transno, rs->rs_opc,
1759 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1762 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
1763 cfs_spin_unlock(&rs->rs_lock);
1765 if (!been_handled && rs->rs_on_net) {
1766 LNetMDUnlink(rs->rs_md_h);
1767 /* Ignore return code; we're racing with
1771 while (nlocks-- > 0)
1772 ldlm_lock_decref(&rs->rs_locks[nlocks],
1773 rs->rs_modes[nlocks]);
1775 cfs_spin_lock(&rs->rs_lock);
1778 rs->rs_scheduled = 0;
1780 if (!rs->rs_on_net) {
1782 cfs_spin_unlock(&rs->rs_lock);
1784 class_export_put (exp);
1785 rs->rs_export = NULL;
1786 ptlrpc_rs_decref (rs);
1787 cfs_atomic_dec (&svc->srv_outstanding_replies);
1788 if (cfs_atomic_dec_and_test(&svc->srv_n_difficult_replies) &&
1789 svc->srv_is_stopping)
1790 cfs_waitq_broadcast(&svc->srv_waitq);
1794 /* still on the net; callback will schedule */
1795 cfs_spin_unlock(&rs->rs_lock);
1802 * Check whether given service has a reply available for processing
1805 * \param svc a ptlrpc service
1806 * \retval 0 no replies processed
1807 * \retval 1 one reply processed
1810 ptlrpc_server_handle_reply(struct ptlrpc_service *svc)
1812 struct ptlrpc_reply_state *rs = NULL;
1815 cfs_spin_lock(&svc->srv_lock);
1816 if (!cfs_list_empty(&svc->srv_reply_queue)) {
1817 rs = cfs_list_entry(svc->srv_reply_queue.prev,
1818 struct ptlrpc_reply_state,
1820 cfs_list_del_init(&rs->rs_list);
1822 cfs_spin_unlock(&svc->srv_lock);
1824 ptlrpc_handle_rs(rs);
1828 /* FIXME make use of timeout later */
1830 liblustre_check_services (void *arg)
1832 int did_something = 0;
1834 cfs_list_t *tmp, *nxt;
1837 /* I'm relying on being single threaded, not to have to lock
1838 * ptlrpc_all_services etc */
1839 cfs_list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
1840 struct ptlrpc_service *svc =
1841 cfs_list_entry (tmp, struct ptlrpc_service, srv_list);
1843 if (svc->srv_threads_running != 0) /* I've recursed */
1846 /* service threads can block for bulk, so this limits us
1847 * (arbitrarily) to recursing 1 stack frame per service.
1848 * Note that the problem with recursion is that we have to
1849 * unwind completely before our caller can resume. */
1851 svc->srv_threads_running++;
1854 rc = ptlrpc_server_handle_req_in(svc);
1855 rc |= ptlrpc_server_handle_reply(svc);
1856 rc |= ptlrpc_at_check_timed(svc);
1857 rc |= ptlrpc_server_handle_request(svc, NULL);
1858 rc |= (ptlrpc_server_post_idle_rqbds(svc) > 0);
1859 did_something |= rc;
1862 svc->srv_threads_running--;
1865 RETURN(did_something);
1867 #define ptlrpc_stop_all_threads(s) do {} while (0)
1869 #else /* __KERNEL__ */
1872 ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
1874 int avail = svc->srv_nrqbd_receiving;
1875 int low_water = test_req_buffer_pressure ? 0 :
1876 svc->srv_nbuf_per_group/2;
1878 /* NB I'm not locking; just looking. */
1880 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
1881 * allowed the request history to grow out of control. We could put a
1882 * sanity check on that here and cull some history if we need the
1885 if (avail <= low_water)
1886 ptlrpc_grow_req_bufs(svc);
1889 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR,
1894 ptlrpc_retry_rqbds(void *arg)
1896 struct ptlrpc_service *svc = (struct ptlrpc_service *)arg;
1898 svc->srv_rqbd_timeout = 0;
1899 return (-ETIMEDOUT);
1902 static int ptlrpc_main(void *arg)
1904 struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
1905 struct ptlrpc_service *svc = data->svc;
1906 struct ptlrpc_thread *thread = data->thread;
1907 struct obd_device *dev = data->dev;
1908 struct ptlrpc_reply_state *rs;
1909 #ifdef WITH_GROUP_INFO
1910 cfs_group_info_t *ginfo = NULL;
1913 int counter = 0, rc = 0;
1916 thread->t_pid = cfs_curproc_pid();
1917 cfs_daemonize_ctxt(data->name);
1919 #if defined(HAVE_NODE_TO_CPUMASK) && defined(CONFIG_NUMA)
1920 /* we need to do this before any per-thread allocation is done so that
1921 * we get the per-thread allocations on local node. bug 7342 */
1922 if (svc->srv_cpu_affinity) {
1925 for (cpu = 0, num_cpu = 0; cpu < cfs_num_possible_cpus();
1927 if (!cfs_cpu_online(cpu))
1929 if (num_cpu == thread->t_id % cfs_num_online_cpus())
1933 cfs_set_cpus_allowed(cfs_current(),
1934 node_to_cpumask(cpu_to_node(cpu)));
1938 #ifdef WITH_GROUP_INFO
1939 ginfo = cfs_groups_alloc(0);
1945 cfs_set_current_groups(ginfo);
1946 cfs_put_group_info(ginfo);
1949 if (svc->srv_init != NULL) {
1950 rc = svc->srv_init(thread);
1955 rc = lu_context_init(&env.le_ctx,
1956 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
1960 thread->t_env = &env;
1961 env.le_ctx.lc_thread = thread;
1962 env.le_ctx.lc_cookie = 0x6;
1964 /* Alloc reply state structure for this one */
1965 OBD_ALLOC_GFP(rs, svc->srv_max_reply_size, CFS_ALLOC_STD);
1971 cfs_spin_lock(&svc->srv_lock);
1972 /* SVC_STOPPING may already be set here if someone else is trying
1973 * to stop the service while this new thread has been dynamically
1974 * forked. We still set SVC_RUNNING to let our creator know that
1975 * we are now running, however we will exit as soon as possible */
1976 thread->t_flags |= SVC_RUNNING;
1977 cfs_spin_unlock(&svc->srv_lock);
1980 * wake up our creator. Note: @data is invalid after this point,
1981 * because it's allocated on ptlrpc_start_thread() stack.
1983 cfs_waitq_signal(&thread->t_ctl_waitq);
1985 thread->t_watchdog = lc_watchdog_add(CFS_GET_TIMEOUT(svc), NULL, NULL);
1987 cfs_spin_lock(&svc->srv_lock);
1988 svc->srv_threads_running++;
1989 cfs_list_add(&rs->rs_list, &svc->srv_free_rs_list);
1990 cfs_spin_unlock(&svc->srv_lock);
1991 cfs_waitq_signal(&svc->srv_free_rs_waitq);
1993 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
1994 svc->srv_threads_running);
1996 /* XXX maintain a list of all managed devices: insert here */
1998 while (!(thread->t_flags & SVC_STOPPING) && !svc->srv_is_stopping) {
1999 /* Don't exit while there are replies to be handled */
2000 struct l_wait_info lwi = LWI_TIMEOUT(svc->srv_rqbd_timeout,
2001 ptlrpc_retry_rqbds, svc);
2003 lc_watchdog_disable(thread->t_watchdog);
2007 l_wait_event_exclusive (svc->srv_waitq,
2008 thread->t_flags & SVC_STOPPING ||
2009 svc->srv_is_stopping ||
2010 (!cfs_list_empty(&svc->srv_idle_rqbds) &&
2011 svc->srv_rqbd_timeout == 0) ||
2012 !cfs_list_empty(&svc->srv_req_in_queue) ||
2013 (ptlrpc_server_request_pending(svc, 0) &&
2014 (svc->srv_n_active_reqs <
2015 (svc->srv_threads_running - 1))) ||
2019 if (thread->t_flags & SVC_STOPPING || svc->srv_is_stopping)
2022 lc_watchdog_touch(thread->t_watchdog, CFS_GET_TIMEOUT(svc));
2024 ptlrpc_check_rqbd_pool(svc);
2026 if (svc->srv_threads_started < svc->srv_threads_max &&
2027 svc->srv_n_active_reqs >= (svc->srv_threads_started - 1))
2028 /* Ignore return code - we tried... */
2029 ptlrpc_start_thread(dev, svc);
2031 if (!cfs_list_empty(&svc->srv_req_in_queue)) {
2032 /* Process all incoming reqs before handling any */
2033 ptlrpc_server_handle_req_in(svc);
2034 /* but limit ourselves in case of flood */
2035 if (counter++ < 1000)
2040 if (svc->srv_at_check)
2041 ptlrpc_at_check_timed(svc);
2043 /* don't handle requests in the last thread */
2044 if (ptlrpc_server_request_pending(svc, 0) &&
2045 (svc->srv_n_active_reqs < (svc->srv_threads_running - 1))) {
2046 lu_context_enter(&env.le_ctx);
2047 ptlrpc_server_handle_request(svc, thread);
2048 lu_context_exit(&env.le_ctx);
2051 if (!cfs_list_empty(&svc->srv_idle_rqbds) &&
2052 ptlrpc_server_post_idle_rqbds(svc) < 0) {
2053 /* I just failed to repost request buffers. Wait
2054 * for a timeout (unless something else happens)
2055 * before I try again */
2056 svc->srv_rqbd_timeout = cfs_time_seconds(1)/10;
2057 CDEBUG(D_RPCTRACE,"Posted buffers: %d\n",
2058 svc->srv_nrqbd_receiving);
2062 lc_watchdog_delete(thread->t_watchdog);
2063 thread->t_watchdog = NULL;
2067 * deconstruct service specific state created by ptlrpc_start_thread()
2069 if (svc->srv_done != NULL)
2070 svc->srv_done(thread);
2072 lu_context_fini(&env.le_ctx);
2074 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2075 thread, thread->t_pid, thread->t_id, rc);
2077 cfs_spin_lock(&svc->srv_lock);
2078 svc->srv_threads_running--; /* must know immediately */
2080 thread->t_flags = SVC_STOPPED;
2082 cfs_waitq_signal(&thread->t_ctl_waitq);
2083 cfs_spin_unlock(&svc->srv_lock);
2088 struct ptlrpc_hr_args {
2091 struct ptlrpc_hr_service *hrs;
2094 static int hrt_dont_sleep(struct ptlrpc_hr_thread *t,
2095 cfs_list_t *replies)
2099 cfs_spin_lock(&t->hrt_lock);
2100 cfs_list_splice_init(&t->hrt_queue, replies);
2101 result = cfs_test_bit(HRT_STOPPING, &t->hrt_flags) ||
2102 !cfs_list_empty(replies);
2103 cfs_spin_unlock(&t->hrt_lock);
2107 static int ptlrpc_hr_main(void *arg)
2109 struct ptlrpc_hr_args * hr_args = arg;
2110 struct ptlrpc_hr_service *hr = hr_args->hrs;
2111 struct ptlrpc_hr_thread *t = &hr->hr_threads[hr_args->thread_index];
2112 char threadname[20];
2113 CFS_LIST_HEAD(replies);
2115 snprintf(threadname, sizeof(threadname),
2116 "ptlrpc_hr_%d", hr_args->thread_index);
2118 cfs_daemonize_ctxt(threadname);
2119 #if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK)
2120 cfs_set_cpus_allowed(cfs_current(),
2121 node_to_cpumask(cpu_to_node(hr_args->cpu_index)));
2123 cfs_set_bit(HRT_RUNNING, &t->hrt_flags);
2124 cfs_waitq_signal(&t->hrt_wait);
2126 while (!cfs_test_bit(HRT_STOPPING, &t->hrt_flags)) {
2128 l_cfs_wait_event(t->hrt_wait, hrt_dont_sleep(t, &replies));
2129 while (!cfs_list_empty(&replies)) {
2130 struct ptlrpc_reply_state *rs;
2132 rs = cfs_list_entry(replies.prev,
2133 struct ptlrpc_reply_state,
2135 cfs_list_del_init(&rs->rs_list);
2136 ptlrpc_handle_rs(rs);
2140 cfs_clear_bit(HRT_RUNNING, &t->hrt_flags);
2141 cfs_complete(&t->hrt_completion);
2146 static int ptlrpc_start_hr_thread(struct ptlrpc_hr_service *hr, int n, int cpu)
2148 struct ptlrpc_hr_thread *t = &hr->hr_threads[n];
2149 struct ptlrpc_hr_args args;
2153 args.thread_index = n;
2154 args.cpu_index = cpu;
2157 rc = cfs_kernel_thread(ptlrpc_hr_main, (void*)&args,
2158 CLONE_VM|CLONE_FILES);
2160 cfs_complete(&t->hrt_completion);
2163 l_cfs_wait_event(t->hrt_wait, cfs_test_bit(HRT_RUNNING, &t->hrt_flags));
2169 static void ptlrpc_stop_hr_thread(struct ptlrpc_hr_thread *t)
2173 cfs_set_bit(HRT_STOPPING, &t->hrt_flags);
2174 cfs_waitq_signal(&t->hrt_wait);
2175 cfs_wait_for_completion(&t->hrt_completion);
2180 static void ptlrpc_stop_hr_threads(struct ptlrpc_hr_service *hrs)
2185 for (n = 0; n < hrs->hr_n_threads; n++)
2186 ptlrpc_stop_hr_thread(&hrs->hr_threads[n]);
2191 static int ptlrpc_start_hr_threads(struct ptlrpc_hr_service *hr)
2194 int n, cpu, threads_started = 0;
2197 LASSERT(hr != NULL);
2198 LASSERT(hr->hr_n_threads > 0);
2200 for (n = 0, cpu = 0; n < hr->hr_n_threads; n++) {
2201 #if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK)
2202 while(!cfs_cpu_online(cpu)) {
2204 if (cpu >= cfs_num_possible_cpus())
2208 rc = ptlrpc_start_hr_thread(hr, n, cpu);
2214 if (threads_started == 0) {
2215 CERROR("No reply handling threads started\n");
2218 if (threads_started < hr->hr_n_threads) {
2219 CWARN("Started only %d reply handling threads from %d\n",
2220 threads_started, hr->hr_n_threads);
2221 hr->hr_n_threads = threads_started;
2226 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
2227 struct ptlrpc_thread *thread)
2229 struct l_wait_info lwi = { 0 };
2232 CDEBUG(D_RPCTRACE, "Stopping thread [ %p : %u ]\n",
2233 thread, thread->t_pid);
2235 cfs_spin_lock(&svc->srv_lock);
2236 /* let the thread know that we would like it to stop asap */
2237 thread->t_flags |= SVC_STOPPING;
2238 cfs_spin_unlock(&svc->srv_lock);
2240 cfs_waitq_broadcast(&svc->srv_waitq);
2241 l_wait_event(thread->t_ctl_waitq,
2242 (thread->t_flags & SVC_STOPPED), &lwi);
2244 cfs_spin_lock(&svc->srv_lock);
2245 cfs_list_del(&thread->t_link);
2246 cfs_spin_unlock(&svc->srv_lock);
2248 OBD_FREE_PTR(thread);
2252 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2254 struct ptlrpc_thread *thread;
2257 cfs_spin_lock(&svc->srv_lock);
2258 while (!cfs_list_empty(&svc->srv_threads)) {
2259 thread = cfs_list_entry(svc->srv_threads.next,
2260 struct ptlrpc_thread, t_link);
2262 cfs_spin_unlock(&svc->srv_lock);
2263 ptlrpc_stop_thread(svc, thread);
2264 cfs_spin_lock(&svc->srv_lock);
2267 cfs_spin_unlock(&svc->srv_lock);
2271 int ptlrpc_start_threads(struct obd_device *dev, struct ptlrpc_service *svc)
2276 /* We require 2 threads min - see note in
2277 ptlrpc_server_handle_request */
2278 LASSERT(svc->srv_threads_min >= 2);
2279 for (i = 0; i < svc->srv_threads_min; i++) {
2280 rc = ptlrpc_start_thread(dev, svc);
2281 /* We have enough threads, don't start more. b=15759 */
2285 CERROR("cannot start %s thread #%d: rc %d\n",
2286 svc->srv_thread_name, i, rc);
2287 ptlrpc_stop_all_threads(svc);
2294 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc)
2296 struct l_wait_info lwi = { 0 };
2297 struct ptlrpc_svc_data d;
2298 struct ptlrpc_thread *thread;
2303 CDEBUG(D_RPCTRACE, "%s started %d min %d max %d running %d\n",
2304 svc->srv_name, svc->srv_threads_started, svc->srv_threads_min,
2305 svc->srv_threads_max, svc->srv_threads_running);
2307 if (unlikely(svc->srv_is_stopping))
2310 if (unlikely(svc->srv_threads_started >= svc->srv_threads_max) ||
2311 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2312 svc->srv_threads_started == svc->srv_threads_min - 1))
2315 OBD_ALLOC_PTR(thread);
2318 cfs_waitq_init(&thread->t_ctl_waitq);
2320 cfs_spin_lock(&svc->srv_lock);
2321 if (svc->srv_threads_started >= svc->srv_threads_max) {
2322 cfs_spin_unlock(&svc->srv_lock);
2323 OBD_FREE_PTR(thread);
2326 cfs_list_add(&thread->t_link, &svc->srv_threads);
2327 id = svc->srv_threads_started++;
2328 cfs_spin_unlock(&svc->srv_lock);
2330 thread->t_svc = svc;
2332 sprintf(name, "%s_%02d", svc->srv_thread_name, id);
2338 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", name);
2340 /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
2341 * just drop the VM and FILES in cfs_daemonize_ctxt() right away.
2343 rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
2345 CERROR("cannot start thread '%s': rc %d\n", name, rc);
2347 cfs_spin_lock(&svc->srv_lock);
2348 cfs_list_del(&thread->t_link);
2349 --svc->srv_threads_started;
2350 cfs_spin_unlock(&svc->srv_lock);
2352 OBD_FREE(thread, sizeof(*thread));
2355 l_wait_event(thread->t_ctl_waitq,
2356 thread->t_flags & (SVC_RUNNING | SVC_STOPPED), &lwi);
2358 rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
2363 int ptlrpc_hr_init(void)
2366 int n_cpus = cfs_num_online_cpus();
2367 struct ptlrpc_hr_service *hr;
2372 LASSERT(ptlrpc_hr == NULL);
2374 size = offsetof(struct ptlrpc_hr_service, hr_threads[n_cpus]);
2375 OBD_ALLOC(hr, size);
2378 for (i = 0; i < n_cpus; i++) {
2379 struct ptlrpc_hr_thread *t = &hr->hr_threads[i];
2381 cfs_spin_lock_init(&t->hrt_lock);
2382 cfs_waitq_init(&t->hrt_wait);
2383 CFS_INIT_LIST_HEAD(&t->hrt_queue);
2384 cfs_init_completion(&t->hrt_completion);
2386 hr->hr_n_threads = n_cpus;
2390 rc = ptlrpc_start_hr_threads(hr);
2392 OBD_FREE(hr, hr->hr_size);
2398 void ptlrpc_hr_fini(void)
2400 if (ptlrpc_hr != NULL) {
2401 ptlrpc_stop_hr_threads(ptlrpc_hr);
2402 OBD_FREE(ptlrpc_hr, ptlrpc_hr->hr_size);
2407 #endif /* __KERNEL__ */
2410 * Wait until all already scheduled replies are processed.
2412 static void ptlrpc_wait_replies(struct ptlrpc_service *svc)
2416 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2418 rc = l_wait_event(svc->srv_waitq, cfs_atomic_read(&svc-> \
2419 srv_n_difficult_replies) == 0,
2423 CWARN("Unexpectedly long timeout %p\n", svc);
2427 int ptlrpc_unregister_service(struct ptlrpc_service *service)
2430 struct l_wait_info lwi;
2432 struct ptlrpc_reply_state *rs, *t;
2433 struct ptlrpc_at_array *array = &service->srv_at_array;
2436 service->srv_is_stopping = 1;
2437 cfs_timer_disarm(&service->srv_at_timer);
2439 ptlrpc_stop_all_threads(service);
2440 LASSERT(cfs_list_empty(&service->srv_threads));
2442 cfs_spin_lock (&ptlrpc_all_services_lock);
2443 cfs_list_del_init (&service->srv_list);
2444 cfs_spin_unlock (&ptlrpc_all_services_lock);
2446 ptlrpc_lprocfs_unregister_service(service);
2448 /* All history will be culled when the next request buffer is
2450 service->srv_max_history_rqbds = 0;
2452 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
2454 rc = LNetClearLazyPortal(service->srv_req_portal);
2457 /* Unlink all the request buffers. This forces a 'final' event with
2458 * its 'unlink' flag set for each posted rqbd */
2459 cfs_list_for_each(tmp, &service->srv_active_rqbds) {
2460 struct ptlrpc_request_buffer_desc *rqbd =
2461 cfs_list_entry(tmp, struct ptlrpc_request_buffer_desc,
2464 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2465 LASSERT (rc == 0 || rc == -ENOENT);
2468 /* Wait for the network to release any buffers it's currently
2471 cfs_spin_lock(&service->srv_lock);
2472 rc = service->srv_nrqbd_receiving;
2473 cfs_spin_unlock(&service->srv_lock);
2478 /* Network access will complete in finite time but the HUGE
2479 * timeout lets us CWARN for visibility of sluggish NALs */
2480 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
2481 cfs_time_seconds(1), NULL, NULL);
2482 rc = l_wait_event(service->srv_waitq,
2483 service->srv_nrqbd_receiving == 0,
2485 if (rc == -ETIMEDOUT)
2486 CWARN("Service %s waiting for request buffers\n",
2490 /* schedule all outstanding replies to terminate them */
2491 cfs_spin_lock(&service->srv_lock);
2492 while (!cfs_list_empty(&service->srv_active_replies)) {
2493 struct ptlrpc_reply_state *rs =
2494 cfs_list_entry(service->srv_active_replies.next,
2495 struct ptlrpc_reply_state, rs_list);
2496 cfs_spin_lock(&rs->rs_lock);
2497 ptlrpc_schedule_difficult_reply(rs);
2498 cfs_spin_unlock(&rs->rs_lock);
2500 cfs_spin_unlock(&service->srv_lock);
2502 /* purge the request queue. NB No new replies (rqbds all unlinked)
2503 * and no service threads, so I'm the only thread noodling the
2504 * request queue now */
2505 while (!cfs_list_empty(&service->srv_req_in_queue)) {
2506 struct ptlrpc_request *req =
2507 cfs_list_entry(service->srv_req_in_queue.next,
2508 struct ptlrpc_request,
2511 cfs_list_del(&req->rq_list);
2512 service->srv_n_queued_reqs--;
2513 service->srv_n_active_reqs++;
2514 ptlrpc_server_finish_request(req);
2516 while (ptlrpc_server_request_pending(service, 1)) {
2517 struct ptlrpc_request *req;
2519 req = ptlrpc_server_request_get(service, 1);
2520 cfs_list_del(&req->rq_list);
2521 service->srv_n_queued_reqs--;
2522 service->srv_n_active_reqs++;
2523 ptlrpc_hpreq_fini(req);
2524 ptlrpc_server_finish_request(req);
2526 LASSERT(service->srv_n_queued_reqs == 0);
2527 LASSERT(service->srv_n_active_reqs == 0);
2528 LASSERT(service->srv_n_history_rqbds == 0);
2529 LASSERT(cfs_list_empty(&service->srv_active_rqbds));
2531 /* Now free all the request buffers since nothing references them
2533 while (!cfs_list_empty(&service->srv_idle_rqbds)) {
2534 struct ptlrpc_request_buffer_desc *rqbd =
2535 cfs_list_entry(service->srv_idle_rqbds.next,
2536 struct ptlrpc_request_buffer_desc,
2539 ptlrpc_free_rqbd(rqbd);
2542 ptlrpc_wait_replies(service);
2544 cfs_list_for_each_entry_safe(rs, t, &service->srv_free_rs_list,
2546 cfs_list_del(&rs->rs_list);
2547 OBD_FREE(rs, service->srv_max_reply_size);
2550 /* In case somebody rearmed this in the meantime */
2551 cfs_timer_disarm(&service->srv_at_timer);
2553 if (array->paa_reqs_array != NULL) {
2554 OBD_FREE(array->paa_reqs_array,
2555 sizeof(cfs_list_t) * array->paa_size);
2556 array->paa_reqs_array = NULL;
2559 if (array->paa_reqs_count != NULL) {
2560 OBD_FREE(array->paa_reqs_count,
2561 sizeof(__u32) * array->paa_size);
2562 array->paa_reqs_count= NULL;
2565 OBD_FREE_PTR(service);
2569 /* Returns 0 if the service is healthy.
2571 * Right now, it just checks to make sure that requests aren't languishing
2572 * in the queue. We'll use this health check to govern whether a node needs
2573 * to be shot, so it's intentionally non-aggressive. */
2574 int ptlrpc_service_health_check(struct ptlrpc_service *svc)
2576 struct ptlrpc_request *request;
2577 struct timeval right_now;
2583 cfs_gettimeofday(&right_now);
2585 cfs_spin_lock(&svc->srv_lock);
2586 if (!ptlrpc_server_request_pending(svc, 1)) {
2587 cfs_spin_unlock(&svc->srv_lock);
2591 /* How long has the next entry been waiting? */
2592 if (cfs_list_empty(&svc->srv_request_queue))
2593 request = cfs_list_entry(svc->srv_request_hpq.next,
2594 struct ptlrpc_request, rq_list);
2596 request = cfs_list_entry(svc->srv_request_queue.next,
2597 struct ptlrpc_request, rq_list);
2598 timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
2599 cfs_spin_unlock(&svc->srv_lock);
2601 if ((timediff / ONE_MILLION) > (AT_OFF ? obd_timeout * 3/2 :
2603 CERROR("%s: unhealthy - request has been waiting %lds\n",
2604 svc->srv_name, timediff / ONE_MILLION);