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 (c) 2002, 2010, Oracle and/or its affiliates. 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 * Part of Rep-Ack logic.
166 * Puts a lock and its mode into reply state assotiated to request reply.
169 ptlrpc_save_lock(struct ptlrpc_request *req,
170 struct lustre_handle *lock, int mode, int no_ack)
172 struct ptlrpc_reply_state *rs = req->rq_reply_state;
176 LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
178 if (req->rq_export->exp_disconnected) {
179 ldlm_lock_decref(lock, mode);
181 idx = rs->rs_nlocks++;
182 rs->rs_locks[idx] = *lock;
183 rs->rs_modes[idx] = mode;
184 rs->rs_difficult = 1;
185 rs->rs_no_ack = !!no_ack;
191 #define HRT_RUNNING 0
192 #define HRT_STOPPING 1
194 struct ptlrpc_hr_thread {
195 cfs_spinlock_t hrt_lock;
196 unsigned long hrt_flags;
197 cfs_waitq_t hrt_wait;
198 cfs_list_t hrt_queue;
199 cfs_completion_t hrt_completion;
202 struct ptlrpc_hr_service {
206 struct ptlrpc_hr_thread hr_threads[0];
210 cfs_list_t rsb_replies;
211 struct ptlrpc_service *rsb_svc;
212 unsigned int rsb_n_replies;
216 * A pointer to per-node reply handling service.
218 static struct ptlrpc_hr_service *ptlrpc_hr = NULL;
221 * maximum mumber of replies scheduled in one batch
223 #define MAX_SCHEDULED 256
226 * Initialize a reply batch.
230 static void rs_batch_init(struct rs_batch *b)
232 memset(b, 0, sizeof *b);
233 CFS_INIT_LIST_HEAD(&b->rsb_replies);
237 * Choose an hr thread to dispatch requests to.
239 static unsigned int get_hr_thread_index(struct ptlrpc_hr_service *hr)
243 /* Concurrent modification of hr_index w/o any spinlock
244 protection is harmless as long as the result fits
245 [0..(hr_n_threads-1)] range and each thread gets near equal
248 hr->hr_index = (idx >= hr->hr_n_threads - 1) ? 0 : idx + 1;
253 * Dispatch all replies accumulated in the batch to one from
254 * dedicated reply handling threads.
258 static void rs_batch_dispatch(struct rs_batch *b)
260 if (b->rsb_n_replies != 0) {
261 struct ptlrpc_hr_service *hr = ptlrpc_hr;
264 idx = get_hr_thread_index(hr);
266 cfs_spin_lock(&hr->hr_threads[idx].hrt_lock);
267 cfs_list_splice_init(&b->rsb_replies,
268 &hr->hr_threads[idx].hrt_queue);
269 cfs_spin_unlock(&hr->hr_threads[idx].hrt_lock);
270 cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait);
271 b->rsb_n_replies = 0;
276 * Add a reply to a batch.
277 * Add one reply object to a batch, schedule batched replies if overload.
282 static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
284 struct ptlrpc_service *svc = rs->rs_service;
286 if (svc != b->rsb_svc || b->rsb_n_replies >= MAX_SCHEDULED) {
287 if (b->rsb_svc != NULL) {
288 rs_batch_dispatch(b);
289 cfs_spin_unlock(&b->rsb_svc->srv_rs_lock);
291 cfs_spin_lock(&svc->srv_rs_lock);
294 cfs_spin_lock(&rs->rs_lock);
295 rs->rs_scheduled_ever = 1;
296 if (rs->rs_scheduled == 0) {
297 cfs_list_move(&rs->rs_list, &b->rsb_replies);
298 rs->rs_scheduled = 1;
301 rs->rs_committed = 1;
302 cfs_spin_unlock(&rs->rs_lock);
306 * Reply batch finalization.
307 * Dispatch remaining replies from the batch
308 * and release remaining spinlock.
312 static void rs_batch_fini(struct rs_batch *b)
314 if (b->rsb_svc != 0) {
315 rs_batch_dispatch(b);
316 cfs_spin_unlock(&b->rsb_svc->srv_rs_lock);
320 #define DECLARE_RS_BATCH(b) struct rs_batch b
322 #else /* __KERNEL__ */
324 #define rs_batch_init(b) do{}while(0)
325 #define rs_batch_fini(b) do{}while(0)
326 #define rs_batch_add(b, r) ptlrpc_schedule_difficult_reply(r)
327 #define DECLARE_RS_BATCH(b)
329 #endif /* __KERNEL__ */
332 * Put reply state into a queue for processing because we received
333 * ACK from the client
335 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
338 struct ptlrpc_hr_service *hr = ptlrpc_hr;
342 LASSERT(cfs_list_empty(&rs->rs_list));
344 idx = get_hr_thread_index(hr);
345 cfs_spin_lock(&hr->hr_threads[idx].hrt_lock);
346 cfs_list_add_tail(&rs->rs_list, &hr->hr_threads[idx].hrt_queue);
347 cfs_spin_unlock(&hr->hr_threads[idx].hrt_lock);
348 cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait);
351 cfs_list_add_tail(&rs->rs_list, &rs->rs_service->srv_reply_queue);
356 ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs)
360 LASSERT_SPIN_LOCKED(&rs->rs_service->srv_rs_lock);
361 LASSERT_SPIN_LOCKED(&rs->rs_lock);
362 LASSERT (rs->rs_difficult);
363 rs->rs_scheduled_ever = 1; /* flag any notification attempt */
365 if (rs->rs_scheduled) { /* being set up or already notified */
370 rs->rs_scheduled = 1;
371 cfs_list_del_init(&rs->rs_list);
372 ptlrpc_dispatch_difficult_reply(rs);
376 void ptlrpc_commit_replies(struct obd_export *exp)
378 struct ptlrpc_reply_state *rs, *nxt;
379 DECLARE_RS_BATCH(batch);
382 rs_batch_init(&batch);
383 /* Find any replies that have been committed and get their service
384 * to attend to complete them. */
386 /* CAVEAT EMPTOR: spinlock ordering!!! */
387 cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
388 cfs_list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
390 LASSERT (rs->rs_difficult);
391 /* VBR: per-export last_committed */
392 LASSERT(rs->rs_export);
393 if (rs->rs_transno <= exp->exp_last_committed) {
394 cfs_list_del_init(&rs->rs_obd_list);
395 rs_batch_add(&batch, rs);
398 cfs_spin_unlock(&exp->exp_uncommitted_replies_lock);
399 rs_batch_fini(&batch);
404 ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc)
406 struct ptlrpc_request_buffer_desc *rqbd;
411 cfs_spin_lock(&svc->srv_lock);
413 if (cfs_list_empty (&svc->srv_idle_rqbds)) {
414 cfs_spin_unlock(&svc->srv_lock);
418 rqbd = cfs_list_entry(svc->srv_idle_rqbds.next,
419 struct ptlrpc_request_buffer_desc,
421 cfs_list_del (&rqbd->rqbd_list);
423 /* assume we will post successfully */
424 svc->srv_nrqbd_receiving++;
425 cfs_list_add (&rqbd->rqbd_list, &svc->srv_active_rqbds);
427 cfs_spin_unlock(&svc->srv_lock);
429 rc = ptlrpc_register_rqbd(rqbd);
436 cfs_spin_lock(&svc->srv_lock);
438 svc->srv_nrqbd_receiving--;
439 cfs_list_del(&rqbd->rqbd_list);
440 cfs_list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
442 /* Don't complain if no request buffers are posted right now; LNET
443 * won't drop requests because we set the portal lazy! */
445 cfs_spin_unlock(&svc->srv_lock);
451 * Start a service with parameters from struct ptlrpc_service_conf \a c
452 * as opposed to directly calling ptlrpc_init_svc with tons of arguments.
454 struct ptlrpc_service *ptlrpc_init_svc_conf(struct ptlrpc_service_conf *c,
455 svc_handler_t h, char *name,
456 struct proc_dir_entry *proc_entry,
457 svc_req_printfn_t prntfn,
460 return ptlrpc_init_svc(c->psc_nbufs, c->psc_bufsize,
461 c->psc_max_req_size, c->psc_max_reply_size,
462 c->psc_req_portal, c->psc_rep_portal,
463 c->psc_watchdog_factor,
465 prntfn, c->psc_min_threads, c->psc_max_threads,
466 threadname, c->psc_ctx_tags, NULL);
468 EXPORT_SYMBOL(ptlrpc_init_svc_conf);
470 static void ptlrpc_at_timer(unsigned long castmeharder)
472 struct ptlrpc_service *svc = (struct ptlrpc_service *)castmeharder;
473 svc->srv_at_check = 1;
474 svc->srv_at_checktime = cfs_time_current();
475 cfs_waitq_signal(&svc->srv_waitq);
479 * Initialize service on a given portal.
480 * This includes starting serving threads , allocating and posting rqbds and
482 * \a nbufs is how many buffers to post
483 * \a bufsize is buffer size to post
484 * \a max_req_size - maximum request size to be accepted for this service
485 * \a max_reply_size maximum reply size this service can ever send
486 * \a req_portal - portal to listed for requests on
487 * \a rep_portal - portal of where to send replies to
488 * \a watchdog_factor soft watchdog timeout multiplifier to print stuck service traces.
489 * \a handler - function to process every new request
490 * \a name - service name
491 * \a proc_entry - entry in the /proc tree for sttistics reporting
492 * \a min_threads \a max_threads - min/max number of service threads to start.
493 * \a threadname should be 11 characters or less - 3 will be added on
494 * \a hp_handler - function to determine priority of the request, also called
495 * on every new request.
497 struct ptlrpc_service *
498 ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size, int max_reply_size,
499 int req_portal, int rep_portal, int watchdog_factor,
500 svc_handler_t handler, char *name,
501 cfs_proc_dir_entry_t *proc_entry,
502 svc_req_printfn_t svcreq_printfn,
503 int min_threads, int max_threads,
504 char *threadname, __u32 ctx_tags,
505 svc_hpreq_handler_t hp_handler)
508 struct ptlrpc_at_array *array;
509 struct ptlrpc_service *service;
510 unsigned int size, index;
514 LASSERT (bufsize >= max_req_size + SPTLRPC_MAX_PAYLOAD);
515 LASSERT (ctx_tags != 0);
517 OBD_ALLOC_PTR(service);
521 /* First initialise enough for early teardown */
523 service->srv_name = name;
524 cfs_spin_lock_init(&service->srv_lock);
525 cfs_spin_lock_init(&service->srv_rq_lock);
526 cfs_spin_lock_init(&service->srv_rs_lock);
527 CFS_INIT_LIST_HEAD(&service->srv_threads);
528 cfs_waitq_init(&service->srv_waitq);
530 service->srv_nbuf_per_group = test_req_buffer_pressure ? 1 : nbufs;
531 service->srv_max_req_size = max_req_size + SPTLRPC_MAX_PAYLOAD;
532 service->srv_buf_size = bufsize;
533 service->srv_rep_portal = rep_portal;
534 service->srv_req_portal = req_portal;
535 service->srv_watchdog_factor = watchdog_factor;
536 service->srv_handler = handler;
537 service->srv_req_printfn = svcreq_printfn;
538 service->srv_request_seq = 1; /* valid seq #s start at 1 */
539 service->srv_request_max_cull_seq = 0;
540 service->srv_threads_min = min_threads;
541 service->srv_threads_max = max_threads;
542 service->srv_thread_name = threadname;
543 service->srv_ctx_tags = ctx_tags;
544 service->srv_hpreq_handler = hp_handler;
545 service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
546 service->srv_hpreq_count = 0;
547 service->srv_n_active_hpreq = 0;
549 rc = LNetSetLazyPortal(service->srv_req_portal);
552 CFS_INIT_LIST_HEAD(&service->srv_request_queue);
553 CFS_INIT_LIST_HEAD(&service->srv_request_hpq);
554 CFS_INIT_LIST_HEAD(&service->srv_idle_rqbds);
555 CFS_INIT_LIST_HEAD(&service->srv_active_rqbds);
556 CFS_INIT_LIST_HEAD(&service->srv_history_rqbds);
557 CFS_INIT_LIST_HEAD(&service->srv_request_history);
558 CFS_INIT_LIST_HEAD(&service->srv_active_replies);
560 CFS_INIT_LIST_HEAD(&service->srv_reply_queue);
562 CFS_INIT_LIST_HEAD(&service->srv_free_rs_list);
563 cfs_waitq_init(&service->srv_free_rs_waitq);
564 cfs_atomic_set(&service->srv_n_difficult_replies, 0);
566 cfs_spin_lock_init(&service->srv_at_lock);
567 CFS_INIT_LIST_HEAD(&service->srv_req_in_queue);
569 array = &service->srv_at_array;
570 size = at_est2timeout(at_max);
571 array->paa_size = size;
572 array->paa_count = 0;
573 array->paa_deadline = -1;
575 /* allocate memory for srv_at_array (ptlrpc_at_array) */
576 OBD_ALLOC(array->paa_reqs_array, sizeof(cfs_list_t) * size);
577 if (array->paa_reqs_array == NULL)
580 for (index = 0; index < size; index++)
581 CFS_INIT_LIST_HEAD(&array->paa_reqs_array[index]);
583 OBD_ALLOC(array->paa_reqs_count, sizeof(__u32) * size);
584 if (array->paa_reqs_count == NULL)
587 cfs_timer_init(&service->srv_at_timer, ptlrpc_at_timer, service);
588 /* At SOW, service time should be quick; 10s seems generous. If client
589 timeout is less than this, we'll be sending an early reply. */
590 at_init(&service->srv_at_estimate, 10, 0);
592 cfs_spin_lock (&ptlrpc_all_services_lock);
593 cfs_list_add (&service->srv_list, &ptlrpc_all_services);
594 cfs_spin_unlock (&ptlrpc_all_services_lock);
596 /* Now allocate the request buffers */
597 rc = ptlrpc_grow_req_bufs(service);
598 /* We shouldn't be under memory pressure at startup, so
599 * fail if we can't post all our buffers at this time. */
603 /* Now allocate pool of reply buffers */
604 /* Increase max reply size to next power of two */
605 service->srv_max_reply_size = 1;
606 while (service->srv_max_reply_size <
607 max_reply_size + SPTLRPC_MAX_PAYLOAD)
608 service->srv_max_reply_size <<= 1;
610 if (proc_entry != NULL)
611 ptlrpc_lprocfs_register_service(proc_entry, service);
613 CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
614 service->srv_name, service->srv_req_portal);
618 ptlrpc_unregister_service(service);
623 * to actually free the request, must be called without holding svc_lock.
624 * note it's caller's responsibility to unlink req->rq_list.
626 static void ptlrpc_server_free_request(struct ptlrpc_request *req)
628 LASSERT(cfs_atomic_read(&req->rq_refcount) == 0);
629 LASSERT(cfs_list_empty(&req->rq_timed_list));
631 /* DEBUG_REQ() assumes the reply state of a request with a valid
632 * ref will not be destroyed until that reference is dropped. */
633 ptlrpc_req_drop_rs(req);
635 sptlrpc_svc_ctx_decref(req);
637 if (req != &req->rq_rqbd->rqbd_req) {
638 /* NB request buffers use an embedded
639 * req if the incoming req unlinked the
640 * MD; this isn't one of them! */
641 OBD_FREE(req, sizeof(*req));
646 * increment the number of active requests consuming service threads.
648 void ptlrpc_server_active_request_inc(struct ptlrpc_request *req)
650 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
651 struct ptlrpc_service *svc = rqbd->rqbd_service;
653 cfs_spin_lock(&svc->srv_rq_lock);
654 svc->srv_n_active_reqs++;
655 cfs_spin_unlock(&svc->srv_rq_lock);
659 * decrement the number of active requests consuming service threads.
661 void ptlrpc_server_active_request_dec(struct ptlrpc_request *req)
663 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
664 struct ptlrpc_service *svc = rqbd->rqbd_service;
666 cfs_spin_lock(&svc->srv_rq_lock);
667 svc->srv_n_active_reqs--;
668 cfs_spin_unlock(&svc->srv_rq_lock);
672 * drop a reference count of the request. if it reaches 0, we either
673 * put it into history list, or free it immediately.
675 void ptlrpc_server_drop_request(struct ptlrpc_request *req)
677 struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
678 struct ptlrpc_service *svc = rqbd->rqbd_service;
683 if (!cfs_atomic_dec_and_test(&req->rq_refcount))
686 cfs_spin_lock(&svc->srv_at_lock);
687 if (req->rq_at_linked) {
688 struct ptlrpc_at_array *array = &svc->srv_at_array;
689 __u32 index = req->rq_at_index;
691 LASSERT(!cfs_list_empty(&req->rq_timed_list));
692 cfs_list_del_init(&req->rq_timed_list);
693 cfs_spin_lock(&req->rq_lock);
694 req->rq_at_linked = 0;
695 cfs_spin_unlock(&req->rq_lock);
696 array->paa_reqs_count[index]--;
699 LASSERT(cfs_list_empty(&req->rq_timed_list));
700 cfs_spin_unlock(&svc->srv_at_lock);
702 /* finalize request */
703 if (req->rq_export) {
704 class_export_put(req->rq_export);
705 req->rq_export = NULL;
708 cfs_spin_lock(&svc->srv_lock);
710 cfs_list_add(&req->rq_list, &rqbd->rqbd_reqs);
712 refcount = --(rqbd->rqbd_refcount);
714 /* request buffer is now idle: add to history */
715 cfs_list_del(&rqbd->rqbd_list);
716 cfs_list_add_tail(&rqbd->rqbd_list, &svc->srv_history_rqbds);
717 svc->srv_n_history_rqbds++;
719 /* cull some history?
720 * I expect only about 1 or 2 rqbds need to be recycled here */
721 while (svc->srv_n_history_rqbds > svc->srv_max_history_rqbds) {
722 rqbd = cfs_list_entry(svc->srv_history_rqbds.next,
723 struct ptlrpc_request_buffer_desc,
726 cfs_list_del(&rqbd->rqbd_list);
727 svc->srv_n_history_rqbds--;
729 /* remove rqbd's reqs from svc's req history while
730 * I've got the service lock */
731 cfs_list_for_each(tmp, &rqbd->rqbd_reqs) {
732 req = cfs_list_entry(tmp, struct ptlrpc_request,
734 /* Track the highest culled req seq */
735 if (req->rq_history_seq >
736 svc->srv_request_max_cull_seq)
737 svc->srv_request_max_cull_seq =
739 cfs_list_del(&req->rq_history_list);
742 cfs_spin_unlock(&svc->srv_lock);
744 cfs_list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
745 req = cfs_list_entry(rqbd->rqbd_reqs.next,
746 struct ptlrpc_request,
748 cfs_list_del(&req->rq_list);
749 ptlrpc_server_free_request(req);
752 cfs_spin_lock(&svc->srv_lock);
754 * now all reqs including the embedded req has been
755 * disposed, schedule request buffer for re-use.
757 LASSERT(cfs_atomic_read(&rqbd->rqbd_req.rq_refcount) ==
759 cfs_list_add_tail(&rqbd->rqbd_list,
760 &svc->srv_idle_rqbds);
763 cfs_spin_unlock(&svc->srv_lock);
764 } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
765 /* If we are low on memory, we are not interested in history */
766 cfs_list_del(&req->rq_list);
767 cfs_list_del_init(&req->rq_history_list);
768 cfs_spin_unlock(&svc->srv_lock);
770 ptlrpc_server_free_request(req);
772 cfs_spin_unlock(&svc->srv_lock);
777 * to finish a request: stop sending more early replies, and release
778 * the request. should be called after we finished handling the request.
780 static void ptlrpc_server_finish_request(struct ptlrpc_service *svc,
781 struct ptlrpc_request *req)
783 cfs_spin_lock(&svc->srv_rq_lock);
784 svc->srv_n_active_reqs--;
786 svc->srv_n_active_hpreq--;
787 cfs_spin_unlock(&svc->srv_rq_lock);
789 ptlrpc_server_drop_request(req);
793 * This function makes sure dead exports are evicted in a timely manner.
794 * This function is only called when some export receives a message (i.e.,
795 * the network is up.)
797 static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
799 struct obd_export *oldest_exp;
800 time_t oldest_time, new_time;
806 /* Compensate for slow machines, etc, by faking our request time
807 into the future. Although this can break the strict time-ordering
808 of the list, we can be really lazy here - we don't have to evict
809 at the exact right moment. Eventually, all silent exports
810 will make it to the top of the list. */
812 /* Do not pay attention on 1sec or smaller renewals. */
813 new_time = cfs_time_current_sec() + extra_delay;
814 if (exp->exp_last_request_time + 1 /*second */ >= new_time)
817 exp->exp_last_request_time = new_time;
818 CDEBUG(D_HA, "updating export %s at "CFS_TIME_T" exp %p\n",
819 exp->exp_client_uuid.uuid,
820 exp->exp_last_request_time, exp);
822 /* exports may get disconnected from the chain even though the
823 export has references, so we must keep the spin lock while
824 manipulating the lists */
825 cfs_spin_lock(&exp->exp_obd->obd_dev_lock);
827 if (cfs_list_empty(&exp->exp_obd_chain_timed)) {
828 /* this one is not timed */
829 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
833 cfs_list_move_tail(&exp->exp_obd_chain_timed,
834 &exp->exp_obd->obd_exports_timed);
836 oldest_exp = cfs_list_entry(exp->exp_obd->obd_exports_timed.next,
837 struct obd_export, exp_obd_chain_timed);
838 oldest_time = oldest_exp->exp_last_request_time;
839 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
841 if (exp->exp_obd->obd_recovering) {
842 /* be nice to everyone during recovery */
847 /* Note - racing to start/reset the obd_eviction timer is safe */
848 if (exp->exp_obd->obd_eviction_timer == 0) {
849 /* Check if the oldest entry is expired. */
850 if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
852 /* We need a second timer, in case the net was down and
853 * it just came back. Since the pinger may skip every
854 * other PING_INTERVAL (see note in ptlrpc_pinger_main),
855 * we better wait for 3. */
856 exp->exp_obd->obd_eviction_timer =
857 cfs_time_current_sec() + 3 * PING_INTERVAL;
858 CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
859 exp->exp_obd->obd_name,
860 obd_export_nid2str(oldest_exp), oldest_time);
863 if (cfs_time_current_sec() >
864 (exp->exp_obd->obd_eviction_timer + extra_delay)) {
865 /* The evictor won't evict anyone who we've heard from
866 * recently, so we don't have to check before we start
868 if (!ping_evictor_wake(exp))
869 exp->exp_obd->obd_eviction_timer = 0;
877 * Sanity check request \a req.
878 * Return 0 if all is ok, error code otherwise.
880 static int ptlrpc_check_req(struct ptlrpc_request *req)
882 if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
883 req->rq_export->exp_conn_cnt)) {
884 DEBUG_REQ(D_ERROR, req,
885 "DROPPING req from old connection %d < %d",
886 lustre_msg_get_conn_cnt(req->rq_reqmsg),
887 req->rq_export->exp_conn_cnt);
890 if (unlikely(req->rq_export->exp_obd &&
891 req->rq_export->exp_obd->obd_fail)) {
892 /* Failing over, don't handle any more reqs, send
893 error response instead. */
894 CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
895 req, req->rq_export->exp_obd->obd_name);
896 req->rq_status = -ENODEV;
904 static void ptlrpc_at_set_timer(struct ptlrpc_service *svc)
906 struct ptlrpc_at_array *array = &svc->srv_at_array;
909 cfs_spin_lock(&svc->srv_at_lock);
910 if (array->paa_count == 0) {
911 cfs_timer_disarm(&svc->srv_at_timer);
912 cfs_spin_unlock(&svc->srv_at_lock);
916 /* Set timer for closest deadline */
917 next = (__s32)(array->paa_deadline - cfs_time_current_sec() -
920 ptlrpc_at_timer((unsigned long)svc);
922 cfs_timer_arm(&svc->srv_at_timer, cfs_time_shift(next));
923 cfs_spin_unlock(&svc->srv_at_lock);
924 CDEBUG(D_INFO, "armed %s at %+ds\n", svc->srv_name, next);
927 /* Add rpc to early reply check list */
928 static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
930 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
931 struct ptlrpc_request *rq = NULL;
932 struct ptlrpc_at_array *array = &svc->srv_at_array;
939 if (req->rq_no_reply)
942 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
945 cfs_spin_lock(&svc->srv_at_lock);
946 LASSERT(cfs_list_empty(&req->rq_timed_list));
948 index = (unsigned long)req->rq_deadline % array->paa_size;
949 if (array->paa_reqs_count[index] > 0) {
950 /* latest rpcs will have the latest deadlines in the list,
951 * so search backward. */
952 cfs_list_for_each_entry_reverse(rq,
953 &array->paa_reqs_array[index],
955 if (req->rq_deadline >= rq->rq_deadline) {
956 cfs_list_add(&req->rq_timed_list,
963 /* Add the request at the head of the list */
964 if (cfs_list_empty(&req->rq_timed_list))
965 cfs_list_add(&req->rq_timed_list,
966 &array->paa_reqs_array[index]);
968 cfs_spin_lock(&req->rq_lock);
969 req->rq_at_linked = 1;
970 cfs_spin_unlock(&req->rq_lock);
971 req->rq_at_index = index;
972 array->paa_reqs_count[index]++;
974 if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
975 array->paa_deadline = req->rq_deadline;
978 cfs_spin_unlock(&svc->srv_at_lock);
981 ptlrpc_at_set_timer(svc);
986 static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
988 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
989 struct ptlrpc_request *reqcopy;
990 struct lustre_msg *reqmsg;
991 cfs_duration_t olddl = req->rq_deadline - cfs_time_current_sec();
996 /* deadline is when the client expects us to reply, margin is the
997 difference between clients' and servers' expectations */
998 DEBUG_REQ(D_ADAPTTO, req,
999 "%ssending early reply (deadline %+lds, margin %+lds) for "
1000 "%d+%d", AT_OFF ? "AT off - not " : "",
1001 olddl, olddl - at_get(&svc->srv_at_estimate),
1002 at_get(&svc->srv_at_estimate), at_extra);
1008 DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), "
1009 "not sending early reply. Consider increasing "
1010 "at_early_margin (%d)?", olddl, at_early_margin);
1012 /* Return an error so we're not re-added to the timed list. */
1016 if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
1017 DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
1018 "but no AT support");
1022 if (req->rq_export &&
1023 lustre_msg_get_flags(req->rq_reqmsg) &
1024 (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
1025 /* During recovery, we don't want to send too many early
1026 * replies, but on the other hand we want to make sure the
1027 * client has enough time to resend if the rpc is lost. So
1028 * during the recovery period send at least 4 early replies,
1029 * spacing them every at_extra if we can. at_estimate should
1030 * always equal this fixed value during recovery. */
1031 at_measured(&svc->srv_at_estimate, min(at_extra,
1032 req->rq_export->exp_obd->obd_recovery_timeout / 4));
1034 /* Fake our processing time into the future to ask the clients
1035 * for some extra amount of time */
1036 at_measured(&svc->srv_at_estimate, at_extra +
1037 cfs_time_current_sec() -
1038 req->rq_arrival_time.tv_sec);
1040 /* Check to see if we've actually increased the deadline -
1041 * we may be past adaptive_max */
1042 if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
1043 at_get(&svc->srv_at_estimate)) {
1044 DEBUG_REQ(D_WARNING, req, "Couldn't add any time "
1045 "(%ld/%ld), not sending early reply\n",
1046 olddl, req->rq_arrival_time.tv_sec +
1047 at_get(&svc->srv_at_estimate) -
1048 cfs_time_current_sec());
1052 newdl = cfs_time_current_sec() + at_get(&svc->srv_at_estimate);
1054 OBD_ALLOC(reqcopy, sizeof *reqcopy);
1055 if (reqcopy == NULL)
1057 OBD_ALLOC(reqmsg, req->rq_reqlen);
1059 OBD_FREE(reqcopy, sizeof *reqcopy);
1064 reqcopy->rq_reply_state = NULL;
1065 reqcopy->rq_rep_swab_mask = 0;
1066 reqcopy->rq_pack_bulk = 0;
1067 reqcopy->rq_pack_udesc = 0;
1068 reqcopy->rq_packed_final = 0;
1069 sptlrpc_svc_ctx_addref(reqcopy);
1070 /* We only need the reqmsg for the magic */
1071 reqcopy->rq_reqmsg = reqmsg;
1072 memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1074 LASSERT(cfs_atomic_read(&req->rq_refcount));
1075 /** if it is last refcount then early reply isn't needed */
1076 if (cfs_atomic_read(&req->rq_refcount) == 1) {
1077 DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
1078 "abort sending early reply\n");
1079 GOTO(out, rc = -EINVAL);
1082 /* Connection ref */
1083 reqcopy->rq_export = class_conn2export(
1084 lustre_msg_get_handle(reqcopy->rq_reqmsg));
1085 if (reqcopy->rq_export == NULL)
1086 GOTO(out, rc = -ENODEV);
1089 class_export_rpc_get(reqcopy->rq_export);
1090 if (reqcopy->rq_export->exp_obd &&
1091 reqcopy->rq_export->exp_obd->obd_fail)
1092 GOTO(out_put, rc = -ENODEV);
1094 rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
1098 rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
1101 /* Adjust our own deadline to what we told the client */
1102 req->rq_deadline = newdl;
1103 req->rq_early_count++; /* number sent, server side */
1105 DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
1108 /* Free the (early) reply state from lustre_pack_reply.
1109 (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
1110 ptlrpc_req_drop_rs(reqcopy);
1113 class_export_rpc_put(reqcopy->rq_export);
1114 class_export_put(reqcopy->rq_export);
1116 sptlrpc_svc_ctx_decref(reqcopy);
1117 OBD_FREE(reqmsg, req->rq_reqlen);
1118 OBD_FREE(reqcopy, sizeof *reqcopy);
1122 /* Send early replies to everybody expiring within at_early_margin
1123 asking for at_extra time */
1124 static int ptlrpc_at_check_timed(struct ptlrpc_service *svc)
1126 struct ptlrpc_request *rq, *n;
1127 cfs_list_t work_list;
1128 struct ptlrpc_at_array *array = &svc->srv_at_array;
1131 time_t now = cfs_time_current_sec();
1132 cfs_duration_t delay;
1133 int first, counter = 0;
1136 cfs_spin_lock(&svc->srv_at_lock);
1137 if (svc->srv_at_check == 0) {
1138 cfs_spin_unlock(&svc->srv_at_lock);
1141 delay = cfs_time_sub(cfs_time_current(), svc->srv_at_checktime);
1142 svc->srv_at_check = 0;
1144 if (array->paa_count == 0) {
1145 cfs_spin_unlock(&svc->srv_at_lock);
1149 /* The timer went off, but maybe the nearest rpc already completed. */
1150 first = array->paa_deadline - now;
1151 if (first > at_early_margin) {
1152 /* We've still got plenty of time. Reset the timer. */
1153 cfs_spin_unlock(&svc->srv_at_lock);
1154 ptlrpc_at_set_timer(svc);
1158 /* We're close to a timeout, and we don't know how much longer the
1159 server will take. Send early replies to everyone expiring soon. */
1160 CFS_INIT_LIST_HEAD(&work_list);
1162 index = (unsigned long)array->paa_deadline % array->paa_size;
1163 count = array->paa_count;
1165 count -= array->paa_reqs_count[index];
1166 cfs_list_for_each_entry_safe(rq, n,
1167 &array->paa_reqs_array[index],
1169 if (rq->rq_deadline <= now + at_early_margin) {
1170 cfs_list_del_init(&rq->rq_timed_list);
1172 * ptlrpc_server_drop_request() may drop
1173 * refcount to 0 already. Let's check this and
1174 * don't add entry to work_list
1176 if (likely(cfs_atomic_inc_not_zero(&rq->rq_refcount)))
1177 cfs_list_add(&rq->rq_timed_list, &work_list);
1179 array->paa_reqs_count[index]--;
1181 cfs_spin_lock(&rq->rq_lock);
1182 rq->rq_at_linked = 0;
1183 cfs_spin_unlock(&rq->rq_lock);
1187 /* update the earliest deadline */
1188 if (deadline == -1 || rq->rq_deadline < deadline)
1189 deadline = rq->rq_deadline;
1194 if (++index >= array->paa_size)
1197 array->paa_deadline = deadline;
1198 cfs_spin_unlock(&svc->srv_at_lock);
1200 /* we have a new earliest deadline, restart the timer */
1201 ptlrpc_at_set_timer(svc);
1203 CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
1204 "replies\n", first, at_extra, counter);
1206 /* We're already past request deadlines before we even get a
1207 chance to send early replies */
1208 LCONSOLE_WARN("%s: This server is not able to keep up with "
1209 "request traffic (cpu-bound).\n", svc->srv_name);
1210 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
1211 "delay="CFS_DURATION_T"(jiff)\n",
1212 counter, svc->srv_n_queued_reqs, svc->srv_n_active_reqs,
1213 at_get(&svc->srv_at_estimate), delay);
1216 /* we took additional refcount so entries can't be deleted from list, no
1217 * locking is needed */
1218 while (!cfs_list_empty(&work_list)) {
1219 rq = cfs_list_entry(work_list.next, struct ptlrpc_request,
1221 cfs_list_del_init(&rq->rq_timed_list);
1223 if (ptlrpc_at_send_early_reply(rq) == 0)
1224 ptlrpc_at_add_timed(rq);
1226 ptlrpc_server_drop_request(rq);
1233 * Put the request to the export list if the request may become
1234 * a high priority one.
1236 static int ptlrpc_hpreq_init(struct ptlrpc_service *svc,
1237 struct ptlrpc_request *req)
1242 if (svc->srv_hpreq_handler) {
1243 rc = svc->srv_hpreq_handler(req);
1247 if (req->rq_export && req->rq_ops) {
1248 cfs_spin_lock_bh(&req->rq_export->exp_rpc_lock);
1249 cfs_list_add(&req->rq_exp_list,
1250 &req->rq_export->exp_queued_rpc);
1251 cfs_spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1257 /** Remove the request from the export list. */
1258 static void ptlrpc_hpreq_fini(struct ptlrpc_request *req)
1261 if (req->rq_export && req->rq_ops) {
1262 cfs_spin_lock_bh(&req->rq_export->exp_rpc_lock);
1263 cfs_list_del_init(&req->rq_exp_list);
1264 cfs_spin_unlock_bh(&req->rq_export->exp_rpc_lock);
1270 * Make the request a high priority one.
1272 * All the high priority requests are queued in a separate FIFO
1273 * ptlrpc_service::srv_request_hpq list which is parallel to
1274 * ptlrpc_service::srv_request_queue list but has a higher priority
1277 * \see ptlrpc_server_handle_request().
1279 static void ptlrpc_hpreq_reorder_nolock(struct ptlrpc_service *svc,
1280 struct ptlrpc_request *req)
1283 LASSERT(svc != NULL);
1284 cfs_spin_lock(&req->rq_lock);
1285 if (req->rq_hp == 0) {
1286 int opc = lustre_msg_get_opc(req->rq_reqmsg);
1288 /* Add to the high priority queue. */
1289 cfs_list_move_tail(&req->rq_list, &svc->srv_request_hpq);
1291 if (opc != OBD_PING)
1292 DEBUG_REQ(D_NET, req, "high priority req");
1294 cfs_spin_unlock(&req->rq_lock);
1299 * \see ptlrpc_hpreq_reorder_nolock
1301 void ptlrpc_hpreq_reorder(struct ptlrpc_request *req)
1303 struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
1306 cfs_spin_lock(&svc->srv_rq_lock);
1307 /* It may happen that the request is already taken for the processing
1308 * but still in the export list, do not re-add it into the HP list. */
1309 if (req->rq_phase == RQ_PHASE_NEW)
1310 ptlrpc_hpreq_reorder_nolock(svc, req);
1311 cfs_spin_unlock(&svc->srv_rq_lock);
1315 /** Check if the request is a high priority one. */
1316 static int ptlrpc_server_hpreq_check(struct ptlrpc_request *req)
1321 /* Check by request opc. */
1322 opc = lustre_msg_get_opc(req->rq_reqmsg);
1323 if (opc == OBD_PING)
1326 /* Perform request specific check. */
1327 if (req->rq_ops && req->rq_ops->hpreq_check)
1328 rc = req->rq_ops->hpreq_check(req);
1332 /** Check if a request is a high priority one. */
1333 static int ptlrpc_server_request_add(struct ptlrpc_service *svc,
1334 struct ptlrpc_request *req)
1339 rc = ptlrpc_server_hpreq_check(req);
1343 cfs_spin_lock(&svc->srv_rq_lock);
1344 /* Before inserting the request into the queue, check if it is not
1345 * inserted yet, or even already handled -- it may happen due to
1346 * a racing ldlm_server_blocking_ast(). */
1347 if (req->rq_phase == RQ_PHASE_NEW && cfs_list_empty(&req->rq_list)) {
1349 ptlrpc_hpreq_reorder_nolock(svc, req);
1351 cfs_list_add_tail(&req->rq_list,
1352 &svc->srv_request_queue);
1354 cfs_spin_unlock(&svc->srv_rq_lock);
1360 * Allow to handle high priority request
1361 * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock
1362 * to get reliable result
1364 static int ptlrpc_server_allow_high(struct ptlrpc_service *svc, int force)
1369 if (svc->srv_n_active_reqs >= svc->srv_threads_running - 1)
1372 return cfs_list_empty(&svc->srv_request_queue) ||
1373 svc->srv_hpreq_count < svc->srv_hpreq_ratio;
1376 static int ptlrpc_server_high_pending(struct ptlrpc_service *svc, int force)
1378 return ptlrpc_server_allow_high(svc, force) &&
1379 !cfs_list_empty(&svc->srv_request_hpq);
1383 * Only allow normal priority requests on a service that has a high-priority
1384 * queue if forced (i.e. cleanup), if there are other high priority requests
1385 * already being processed (i.e. those threads can service more high-priority
1386 * requests), or if there are enough idle threads that a later thread can do
1387 * a high priority request.
1388 * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock
1389 * to get reliable result
1391 static int ptlrpc_server_allow_normal(struct ptlrpc_service *svc, int force)
1394 svc->srv_n_active_reqs < svc->srv_threads_running - 2)
1397 if (svc->srv_n_active_reqs >= svc->srv_threads_running - 1)
1400 return svc->srv_n_active_hpreq > 0 || svc->srv_hpreq_handler == NULL;
1403 static int ptlrpc_server_normal_pending(struct ptlrpc_service *svc, int force)
1405 return ptlrpc_server_allow_normal(svc, force) &&
1406 !cfs_list_empty(&svc->srv_request_queue);
1410 * Returns true if there are requests available in incoming
1411 * request queue for processing and it is allowed to fetch them.
1412 * User can call it w/o any lock but need to hold ptlrpc_service::srv_rq_lock
1413 * to get reliable result
1414 * \see ptlrpc_server_allow_normal
1415 * \see ptlrpc_server_allow high
1418 ptlrpc_server_request_pending(struct ptlrpc_service *svc, int force)
1420 return ptlrpc_server_high_pending(svc, force) ||
1421 ptlrpc_server_normal_pending(svc, force);
1425 * Fetch a request for processing from queue of unprocessed requests.
1426 * Favors high-priority requests.
1427 * Returns a pointer to fetched request.
1429 static struct ptlrpc_request *
1430 ptlrpc_server_request_get(struct ptlrpc_service *svc, int force)
1432 struct ptlrpc_request *req;
1435 if (ptlrpc_server_high_pending(svc, force)) {
1436 req = cfs_list_entry(svc->srv_request_hpq.next,
1437 struct ptlrpc_request, rq_list);
1438 svc->srv_hpreq_count++;
1443 if (ptlrpc_server_normal_pending(svc, force)) {
1444 req = cfs_list_entry(svc->srv_request_queue.next,
1445 struct ptlrpc_request, rq_list);
1446 svc->srv_hpreq_count = 0;
1453 * Handle freshly incoming reqs, add to timed early reply list,
1454 * pass on to regular request queue.
1455 * All incoming requests pass through here before getting into
1456 * ptlrpc_server_handle_req later on.
1459 ptlrpc_server_handle_req_in(struct ptlrpc_service *svc)
1461 struct ptlrpc_request *req;
1468 cfs_spin_lock(&svc->srv_lock);
1469 if (cfs_list_empty(&svc->srv_req_in_queue)) {
1470 cfs_spin_unlock(&svc->srv_lock);
1474 req = cfs_list_entry(svc->srv_req_in_queue.next,
1475 struct ptlrpc_request, rq_list);
1476 cfs_list_del_init (&req->rq_list);
1477 svc->srv_n_queued_reqs--;
1478 /* Consider this still a "queued" request as far as stats are
1480 cfs_spin_unlock(&svc->srv_lock);
1482 /* go through security check/transform */
1483 rc = sptlrpc_svc_unwrap_request(req);
1487 case SECSVC_COMPLETE:
1488 target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
1497 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1498 * redo it wouldn't be harmful.
1500 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
1501 rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
1503 CERROR("error unpacking request: ptl %d from %s "
1504 "x"LPU64"\n", svc->srv_req_portal,
1505 libcfs_id2str(req->rq_peer), req->rq_xid);
1510 rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
1512 CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
1513 LPU64"\n", svc->srv_req_portal,
1514 libcfs_id2str(req->rq_peer), req->rq_xid);
1518 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
1519 lustre_msg_get_opc(req->rq_reqmsg) == obd_fail_val) {
1520 CERROR("drop incoming rpc opc %u, x"LPU64"\n",
1521 obd_fail_val, req->rq_xid);
1526 if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
1527 CERROR("wrong packet type received (type=%u) from %s\n",
1528 lustre_msg_get_type(req->rq_reqmsg),
1529 libcfs_id2str(req->rq_peer));
1533 switch(lustre_msg_get_opc(req->rq_reqmsg)) {
1536 req->rq_bulk_write = 1;
1540 req->rq_bulk_read = 1;
1544 CDEBUG(D_NET, "got req "LPU64"\n", req->rq_xid);
1546 req->rq_export = class_conn2export(
1547 lustre_msg_get_handle(req->rq_reqmsg));
1548 if (req->rq_export) {
1549 rc = ptlrpc_check_req(req);
1551 rc = sptlrpc_target_export_check(req->rq_export, req);
1553 DEBUG_REQ(D_ERROR, req, "DROPPING req with "
1554 "illegal security flavor,");
1559 ptlrpc_update_export_timer(req->rq_export, 0);
1562 /* req_in handling should/must be fast */
1563 if (cfs_time_current_sec() - req->rq_arrival_time.tv_sec > 5)
1564 DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
1565 cfs_time_sub(cfs_time_current_sec(),
1566 req->rq_arrival_time.tv_sec));
1568 /* Set rpc server deadline and add it to the timed list */
1569 deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
1570 MSGHDR_AT_SUPPORT) ?
1571 /* The max time the client expects us to take */
1572 lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
1573 req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
1574 if (unlikely(deadline == 0)) {
1575 DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
1579 ptlrpc_at_add_timed(req);
1580 rc = ptlrpc_hpreq_init(svc, req);
1584 /* Move it over to the request processing queue */
1585 rc = ptlrpc_server_request_add(svc, req);
1588 cfs_waitq_signal(&svc->srv_waitq);
1592 cfs_spin_lock(&svc->srv_rq_lock);
1593 svc->srv_n_active_reqs++;
1594 cfs_spin_unlock(&svc->srv_rq_lock);
1595 ptlrpc_server_finish_request(svc, req);
1601 * Main incoming request handling logic.
1602 * Calls handler function from service to do actual processing.
1605 ptlrpc_server_handle_request(struct ptlrpc_service *svc,
1606 struct ptlrpc_thread *thread)
1608 struct obd_export *export = NULL;
1609 struct ptlrpc_request *request;
1610 struct timeval work_start;
1611 struct timeval work_end;
1619 cfs_spin_lock(&svc->srv_rq_lock);
1621 /* !@%$# liblustre only has 1 thread */
1622 if (cfs_atomic_read(&svc->srv_n_difficult_replies) != 0) {
1623 cfs_spin_unlock(&svc->srv_rq_lock);
1627 request = ptlrpc_server_request_get(svc, 0);
1628 if (request == NULL) {
1629 cfs_spin_unlock(&svc->srv_rq_lock);
1633 opc = lustre_msg_get_opc(request->rq_reqmsg);
1634 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
1635 fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
1636 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
1637 fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
1639 if (unlikely(fail_opc)) {
1640 if (request->rq_export && request->rq_ops) {
1641 cfs_spin_unlock(&svc->srv_rq_lock);
1642 OBD_FAIL_TIMEOUT(fail_opc, 4);
1643 cfs_spin_lock(&svc->srv_rq_lock);
1644 request = ptlrpc_server_request_get(svc, 0);
1645 if (request == NULL) {
1646 cfs_spin_unlock(&svc->srv_rq_lock);
1652 cfs_list_del_init(&request->rq_list);
1653 svc->srv_n_active_reqs++;
1655 svc->srv_n_active_hpreq++;
1657 /* The phase is changed under the lock here because we need to know
1658 * the request is under processing (see ptlrpc_hpreq_reorder()). */
1659 ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
1660 cfs_spin_unlock(&svc->srv_rq_lock);
1662 ptlrpc_hpreq_fini(request);
1664 if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
1665 libcfs_debug_dumplog();
1667 cfs_gettimeofday(&work_start);
1668 timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
1669 if (likely(svc->srv_stats != NULL)) {
1670 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
1672 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
1673 svc->srv_n_queued_reqs);
1674 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
1675 svc->srv_n_active_reqs);
1676 lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
1677 at_get(&svc->srv_at_estimate));
1680 rc = lu_context_init(&request->rq_session,
1681 LCT_SESSION|LCT_REMEMBER|LCT_NOREF);
1683 CERROR("Failure to initialize session: %d\n", rc);
1686 request->rq_session.lc_thread = thread;
1687 request->rq_session.lc_cookie = 0x5;
1688 lu_context_enter(&request->rq_session);
1690 CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
1692 request->rq_svc_thread = thread;
1694 request->rq_svc_thread->t_env->le_ses = &request->rq_session;
1696 if (likely(request->rq_export)) {
1697 if (unlikely(ptlrpc_check_req(request)))
1699 ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
1700 export = class_export_rpc_get(request->rq_export);
1703 /* Discard requests queued for longer than the deadline.
1704 The deadline is increased if we send an early reply. */
1705 if (cfs_time_current_sec() > request->rq_deadline) {
1706 DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s"
1707 ": deadline "CFS_DURATION_T":"CFS_DURATION_T"s ago\n",
1708 libcfs_id2str(request->rq_peer),
1709 cfs_time_sub(request->rq_deadline,
1710 request->rq_arrival_time.tv_sec),
1711 cfs_time_sub(cfs_time_current_sec(),
1712 request->rq_deadline));
1713 goto put_rpc_export;
1716 CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
1717 "%s:%s+%d:%d:x"LPU64":%s:%d\n", cfs_curproc_comm(),
1718 (request->rq_export ?
1719 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1720 (request->rq_export ?
1721 cfs_atomic_read(&request->rq_export->exp_refcount) : -99),
1722 lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
1723 libcfs_id2str(request->rq_peer),
1724 lustre_msg_get_opc(request->rq_reqmsg));
1726 if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
1727 OBD_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, obd_fail_val);
1729 rc = svc->srv_handler(request);
1731 ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
1735 class_export_rpc_put(export);
1737 lu_context_exit(&request->rq_session);
1738 lu_context_fini(&request->rq_session);
1740 if (unlikely(cfs_time_current_sec() > request->rq_deadline)) {
1741 DEBUG_REQ(D_WARNING, request, "Request x"LPU64" took longer "
1742 "than estimated ("CFS_DURATION_T":"CFS_DURATION_T"s);"
1743 " client may timeout.",
1744 request->rq_xid, cfs_time_sub(request->rq_deadline,
1745 request->rq_arrival_time.tv_sec),
1746 cfs_time_sub(cfs_time_current_sec(),
1747 request->rq_deadline));
1750 cfs_gettimeofday(&work_end);
1751 timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
1752 CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
1753 "%s:%s+%d:%d:x"LPU64":%s:%d Request procesed in "
1754 "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
1756 (request->rq_export ?
1757 (char *)request->rq_export->exp_client_uuid.uuid : "0"),
1758 (request->rq_export ?
1759 cfs_atomic_read(&request->rq_export->exp_refcount) : -99),
1760 lustre_msg_get_status(request->rq_reqmsg),
1762 libcfs_id2str(request->rq_peer),
1763 lustre_msg_get_opc(request->rq_reqmsg),
1765 cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
1766 (request->rq_repmsg ?
1767 lustre_msg_get_transno(request->rq_repmsg) :
1768 request->rq_transno),
1770 (request->rq_repmsg ?
1771 lustre_msg_get_status(request->rq_repmsg) : -999));
1772 if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
1773 __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
1774 int opc = opcode_offset(op);
1775 if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
1776 LASSERT(opc < LUSTRE_MAX_OPCODES);
1777 lprocfs_counter_add(svc->srv_stats,
1778 opc + EXTRA_MAX_OPCODES,
1782 if (unlikely(request->rq_early_count)) {
1783 DEBUG_REQ(D_ADAPTTO, request,
1784 "sent %d early replies before finishing in "
1786 request->rq_early_count,
1787 cfs_time_sub(work_end.tv_sec,
1788 request->rq_arrival_time.tv_sec));
1792 ptlrpc_server_finish_request(svc, request);
1798 * An internal function to process a single reply state object.
1801 ptlrpc_handle_rs (struct ptlrpc_reply_state *rs)
1803 struct ptlrpc_service *svc = rs->rs_service;
1804 struct obd_export *exp;
1805 struct obd_device *obd;
1810 exp = rs->rs_export;
1813 LASSERT (rs->rs_difficult);
1814 LASSERT (rs->rs_scheduled);
1815 LASSERT (cfs_list_empty(&rs->rs_list));
1817 cfs_spin_lock (&exp->exp_lock);
1818 /* Noop if removed already */
1819 cfs_list_del_init (&rs->rs_exp_list);
1820 cfs_spin_unlock (&exp->exp_lock);
1822 /* The disk commit callback holds exp_uncommitted_replies_lock while it
1823 * iterates over newly committed replies, removing them from
1824 * exp_uncommitted_replies. It then drops this lock and schedules the
1825 * replies it found for handling here.
1827 * We can avoid contention for exp_uncommitted_replies_lock between the
1828 * HRT threads and further commit callbacks by checking rs_committed
1829 * which is set in the commit callback while it holds both
1830 * rs_lock and exp_uncommitted_reples.
1832 * If we see rs_committed clear, the commit callback _may_ not have
1833 * handled this reply yet and we race with it to grab
1834 * exp_uncommitted_replies_lock before removing the reply from
1835 * exp_uncommitted_replies. Note that if we lose the race and the
1836 * reply has already been removed, list_del_init() is a noop.
1838 * If we see rs_committed set, we know the commit callback is handling,
1839 * or has handled this reply since store reordering might allow us to
1840 * see rs_committed set out of sequence. But since this is done
1841 * holding rs_lock, we can be sure it has all completed once we hold
1842 * rs_lock, which we do right next.
1844 if (!rs->rs_committed) {
1845 cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
1846 cfs_list_del_init(&rs->rs_obd_list);
1847 cfs_spin_unlock(&exp->exp_uncommitted_replies_lock);
1850 cfs_spin_lock(&rs->rs_lock);
1852 been_handled = rs->rs_handled;
1855 nlocks = rs->rs_nlocks; /* atomic "steal", but */
1856 rs->rs_nlocks = 0; /* locks still on rs_locks! */
1858 if (nlocks == 0 && !been_handled) {
1859 /* If we see this, we should already have seen the warning
1860 * in mds_steal_ack_locks() */
1861 CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
1864 rs->rs_xid, rs->rs_transno, rs->rs_opc,
1865 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1868 if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
1869 cfs_spin_unlock(&rs->rs_lock);
1871 if (!been_handled && rs->rs_on_net) {
1872 LNetMDUnlink(rs->rs_md_h);
1873 /* Ignore return code; we're racing with
1877 while (nlocks-- > 0)
1878 ldlm_lock_decref(&rs->rs_locks[nlocks],
1879 rs->rs_modes[nlocks]);
1881 cfs_spin_lock(&rs->rs_lock);
1884 rs->rs_scheduled = 0;
1886 if (!rs->rs_on_net) {
1888 cfs_spin_unlock(&rs->rs_lock);
1890 class_export_put (exp);
1891 rs->rs_export = NULL;
1892 ptlrpc_rs_decref (rs);
1893 if (cfs_atomic_dec_and_test(&svc->srv_n_difficult_replies) &&
1894 svc->srv_is_stopping)
1895 cfs_waitq_broadcast(&svc->srv_waitq);
1899 /* still on the net; callback will schedule */
1900 cfs_spin_unlock(&rs->rs_lock);
1907 * Check whether given service has a reply available for processing
1910 * \param svc a ptlrpc service
1911 * \retval 0 no replies processed
1912 * \retval 1 one reply processed
1915 ptlrpc_server_handle_reply(struct ptlrpc_service *svc)
1917 struct ptlrpc_reply_state *rs = NULL;
1920 cfs_spin_lock(&svc->srv_rs_lock);
1921 if (!cfs_list_empty(&svc->srv_reply_queue)) {
1922 rs = cfs_list_entry(svc->srv_reply_queue.prev,
1923 struct ptlrpc_reply_state,
1925 cfs_list_del_init(&rs->rs_list);
1927 cfs_spin_unlock(&svc->srv_rs_lock);
1929 ptlrpc_handle_rs(rs);
1933 /* FIXME make use of timeout later */
1935 liblustre_check_services (void *arg)
1937 int did_something = 0;
1939 cfs_list_t *tmp, *nxt;
1942 /* I'm relying on being single threaded, not to have to lock
1943 * ptlrpc_all_services etc */
1944 cfs_list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
1945 struct ptlrpc_service *svc =
1946 cfs_list_entry (tmp, struct ptlrpc_service, srv_list);
1948 if (svc->srv_threads_running != 0) /* I've recursed */
1951 /* service threads can block for bulk, so this limits us
1952 * (arbitrarily) to recursing 1 stack frame per service.
1953 * Note that the problem with recursion is that we have to
1954 * unwind completely before our caller can resume. */
1956 svc->srv_threads_running++;
1959 rc = ptlrpc_server_handle_req_in(svc);
1960 rc |= ptlrpc_server_handle_reply(svc);
1961 rc |= ptlrpc_at_check_timed(svc);
1962 rc |= ptlrpc_server_handle_request(svc, NULL);
1963 rc |= (ptlrpc_server_post_idle_rqbds(svc) > 0);
1964 did_something |= rc;
1967 svc->srv_threads_running--;
1970 RETURN(did_something);
1972 #define ptlrpc_stop_all_threads(s) do {} while (0)
1974 #else /* __KERNEL__ */
1977 ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
1979 int avail = svc->srv_nrqbd_receiving;
1980 int low_water = test_req_buffer_pressure ? 0 :
1981 svc->srv_nbuf_per_group/2;
1983 /* NB I'm not locking; just looking. */
1985 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
1986 * allowed the request history to grow out of control. We could put a
1987 * sanity check on that here and cull some history if we need the
1990 if (avail <= low_water)
1991 ptlrpc_grow_req_bufs(svc);
1994 lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR,
1999 ptlrpc_retry_rqbds(void *arg)
2001 struct ptlrpc_service *svc = (struct ptlrpc_service *)arg;
2003 svc->srv_rqbd_timeout = 0;
2004 return (-ETIMEDOUT);
2008 ptlrpc_threads_enough(struct ptlrpc_service *svc)
2010 return svc->srv_n_active_reqs <
2011 svc->srv_threads_running - 1 - (svc->srv_hpreq_handler != NULL);
2015 * allowed to create more threads
2016 * user can call it w/o any lock but need to hold ptlrpc_service::srv_lock to
2017 * get reliable result
2020 ptlrpc_threads_increasable(struct ptlrpc_service *svc)
2022 return svc->srv_threads_running +
2023 svc->srv_threads_starting < svc->srv_threads_max;
2027 * too many requests and allowed to create more threads
2030 ptlrpc_threads_need_create(struct ptlrpc_service *svc)
2032 return !ptlrpc_threads_enough(svc) && ptlrpc_threads_increasable(svc);
2036 ptlrpc_thread_stopping(struct ptlrpc_thread *thread)
2038 return (thread->t_flags & SVC_STOPPING) != 0 ||
2039 thread->t_svc->srv_is_stopping;
2043 ptlrpc_rqbd_pending(struct ptlrpc_service *svc)
2045 return !cfs_list_empty(&svc->srv_idle_rqbds) &&
2046 svc->srv_rqbd_timeout == 0;
2050 ptlrpc_at_check(struct ptlrpc_service *svc)
2052 return svc->srv_at_check;
2056 * requests wait on preprocessing
2057 * user can call it w/o any lock but need to hold ptlrpc_service::srv_lock to
2058 * get reliable result
2061 ptlrpc_server_request_waiting(struct ptlrpc_service *svc)
2063 return !cfs_list_empty(&svc->srv_req_in_queue);
2067 * Main thread body for service threads.
2068 * Waits in a loop waiting for new requests to process to appear.
2069 * Every time an incoming requests is added to its queue, a waitq
2070 * is woken up and one of the threads will handle it.
2072 static int ptlrpc_main(void *arg)
2074 struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
2075 struct ptlrpc_service *svc = data->svc;
2076 struct ptlrpc_thread *thread = data->thread;
2077 struct ptlrpc_reply_state *rs;
2078 #ifdef WITH_GROUP_INFO
2079 cfs_group_info_t *ginfo = NULL;
2082 int counter = 0, rc = 0;
2085 thread->t_pid = cfs_curproc_pid();
2086 cfs_daemonize_ctxt(data->name);
2088 #if defined(HAVE_NODE_TO_CPUMASK) && defined(CONFIG_NUMA)
2089 /* we need to do this before any per-thread allocation is done so that
2090 * we get the per-thread allocations on local node. bug 7342 */
2091 if (svc->srv_cpu_affinity) {
2094 for (cpu = 0, num_cpu = 0; cpu < cfs_num_possible_cpus();
2096 if (!cfs_cpu_online(cpu))
2098 if (num_cpu == thread->t_id % cfs_num_online_cpus())
2102 cfs_set_cpus_allowed(cfs_current(),
2103 node_to_cpumask(cpu_to_node(cpu)));
2107 #ifdef WITH_GROUP_INFO
2108 ginfo = cfs_groups_alloc(0);
2114 cfs_set_current_groups(ginfo);
2115 cfs_put_group_info(ginfo);
2118 if (svc->srv_init != NULL) {
2119 rc = svc->srv_init(thread);
2124 rc = lu_context_init(&env.le_ctx,
2125 svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
2129 thread->t_env = &env;
2130 env.le_ctx.lc_thread = thread;
2131 env.le_ctx.lc_cookie = 0x6;
2133 /* Alloc reply state structure for this one */
2134 OBD_ALLOC_GFP(rs, svc->srv_max_reply_size, CFS_ALLOC_STD);
2140 cfs_spin_lock(&svc->srv_lock);
2142 LASSERT((thread->t_flags & SVC_STARTING) != 0);
2143 thread->t_flags &= ~SVC_STARTING;
2144 svc->srv_threads_starting--;
2146 /* SVC_STOPPING may already be set here if someone else is trying
2147 * to stop the service while this new thread has been dynamically
2148 * forked. We still set SVC_RUNNING to let our creator know that
2149 * we are now running, however we will exit as soon as possible */
2150 thread->t_flags |= SVC_RUNNING;
2151 svc->srv_threads_running++;
2152 cfs_spin_unlock(&svc->srv_lock);
2155 * wake up our creator. Note: @data is invalid after this point,
2156 * because it's allocated on ptlrpc_start_thread() stack.
2158 cfs_waitq_signal(&thread->t_ctl_waitq);
2160 thread->t_watchdog = lc_watchdog_add(CFS_GET_TIMEOUT(svc), NULL, NULL);
2162 cfs_spin_lock(&svc->srv_rs_lock);
2163 cfs_list_add(&rs->rs_list, &svc->srv_free_rs_list);
2164 cfs_waitq_signal(&svc->srv_free_rs_waitq);
2165 cfs_spin_unlock(&svc->srv_rs_lock);
2167 CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
2168 svc->srv_threads_running);
2170 /* XXX maintain a list of all managed devices: insert here */
2171 while (!ptlrpc_thread_stopping(thread)) {
2172 /* Don't exit while there are replies to be handled */
2173 struct l_wait_info lwi = LWI_TIMEOUT(svc->srv_rqbd_timeout,
2174 ptlrpc_retry_rqbds, svc);
2176 lc_watchdog_disable(thread->t_watchdog);
2180 l_wait_event_exclusive(svc->srv_waitq,
2181 ptlrpc_thread_stopping(thread) ||
2182 ptlrpc_server_request_waiting(svc) ||
2183 ptlrpc_server_request_pending(svc, 0) ||
2184 ptlrpc_rqbd_pending(svc) ||
2185 ptlrpc_at_check(svc), &lwi);
2187 if (ptlrpc_thread_stopping(thread))
2190 lc_watchdog_touch(thread->t_watchdog, CFS_GET_TIMEOUT(svc));
2192 ptlrpc_check_rqbd_pool(svc);
2194 if (ptlrpc_threads_need_create(svc)) {
2195 /* Ignore return code - we tried... */
2196 ptlrpc_start_thread(svc);
2199 /* Process all incoming reqs before handling any */
2200 if (ptlrpc_server_request_waiting(svc)) {
2201 ptlrpc_server_handle_req_in(svc);
2202 /* but limit ourselves in case of flood */
2203 if (counter++ < 100)
2208 if (ptlrpc_at_check(svc))
2209 ptlrpc_at_check_timed(svc);
2211 if (ptlrpc_server_request_pending(svc, 0)) {
2212 lu_context_enter(&env.le_ctx);
2213 ptlrpc_server_handle_request(svc, thread);
2214 lu_context_exit(&env.le_ctx);
2217 if (ptlrpc_rqbd_pending(svc) &&
2218 ptlrpc_server_post_idle_rqbds(svc) < 0) {
2219 /* I just failed to repost request buffers.
2220 * Wait for a timeout (unless something else
2221 * happens) before I try again */
2222 svc->srv_rqbd_timeout = cfs_time_seconds(1)/10;
2223 CDEBUG(D_RPCTRACE,"Posted buffers: %d\n",
2224 svc->srv_nrqbd_receiving);
2228 lc_watchdog_delete(thread->t_watchdog);
2229 thread->t_watchdog = NULL;
2233 * deconstruct service specific state created by ptlrpc_start_thread()
2235 if (svc->srv_done != NULL)
2236 svc->srv_done(thread);
2238 lu_context_fini(&env.le_ctx);
2240 CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
2241 thread, thread->t_pid, thread->t_id, rc);
2243 cfs_spin_lock(&svc->srv_lock);
2244 if ((thread->t_flags & SVC_STARTING) != 0) {
2245 svc->srv_threads_starting--;
2246 thread->t_flags &= ~SVC_STARTING;
2249 if ((thread->t_flags & SVC_RUNNING) != 0) {
2250 /* must know immediately */
2251 svc->srv_threads_running--;
2252 thread->t_flags &= ~SVC_RUNNING;
2256 thread->t_flags |= SVC_STOPPED;
2258 cfs_waitq_signal(&thread->t_ctl_waitq);
2259 cfs_spin_unlock(&svc->srv_lock);
2264 struct ptlrpc_hr_args {
2267 struct ptlrpc_hr_service *hrs;
2270 static int hrt_dont_sleep(struct ptlrpc_hr_thread *t,
2271 cfs_list_t *replies)
2275 cfs_spin_lock(&t->hrt_lock);
2276 cfs_list_splice_init(&t->hrt_queue, replies);
2277 result = cfs_test_bit(HRT_STOPPING, &t->hrt_flags) ||
2278 !cfs_list_empty(replies);
2279 cfs_spin_unlock(&t->hrt_lock);
2284 * Main body of "handle reply" function.
2285 * It processes acked reply states
2287 static int ptlrpc_hr_main(void *arg)
2289 struct ptlrpc_hr_args * hr_args = arg;
2290 struct ptlrpc_hr_service *hr = hr_args->hrs;
2291 struct ptlrpc_hr_thread *t = &hr->hr_threads[hr_args->thread_index];
2292 char threadname[20];
2293 CFS_LIST_HEAD(replies);
2295 snprintf(threadname, sizeof(threadname),
2296 "ptlrpc_hr_%d", hr_args->thread_index);
2298 cfs_daemonize_ctxt(threadname);
2299 #if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK)
2300 cfs_set_cpus_allowed(cfs_current(),
2301 node_to_cpumask(cpu_to_node(hr_args->cpu_index)));
2303 cfs_set_bit(HRT_RUNNING, &t->hrt_flags);
2304 cfs_waitq_signal(&t->hrt_wait);
2306 while (!cfs_test_bit(HRT_STOPPING, &t->hrt_flags)) {
2308 l_cfs_wait_event(t->hrt_wait, hrt_dont_sleep(t, &replies));
2309 while (!cfs_list_empty(&replies)) {
2310 struct ptlrpc_reply_state *rs;
2312 rs = cfs_list_entry(replies.prev,
2313 struct ptlrpc_reply_state,
2315 cfs_list_del_init(&rs->rs_list);
2316 ptlrpc_handle_rs(rs);
2320 cfs_clear_bit(HRT_RUNNING, &t->hrt_flags);
2321 cfs_complete(&t->hrt_completion);
2326 static int ptlrpc_start_hr_thread(struct ptlrpc_hr_service *hr, int n, int cpu)
2328 struct ptlrpc_hr_thread *t = &hr->hr_threads[n];
2329 struct ptlrpc_hr_args args;
2333 args.thread_index = n;
2334 args.cpu_index = cpu;
2337 rc = cfs_kernel_thread(ptlrpc_hr_main, (void*)&args,
2338 CLONE_VM|CLONE_FILES);
2340 cfs_complete(&t->hrt_completion);
2343 l_cfs_wait_event(t->hrt_wait, cfs_test_bit(HRT_RUNNING, &t->hrt_flags));
2349 static void ptlrpc_stop_hr_thread(struct ptlrpc_hr_thread *t)
2353 cfs_set_bit(HRT_STOPPING, &t->hrt_flags);
2354 cfs_waitq_signal(&t->hrt_wait);
2355 cfs_wait_for_completion(&t->hrt_completion);
2360 static void ptlrpc_stop_hr_threads(struct ptlrpc_hr_service *hrs)
2365 for (n = 0; n < hrs->hr_n_threads; n++)
2366 ptlrpc_stop_hr_thread(&hrs->hr_threads[n]);
2371 static int ptlrpc_start_hr_threads(struct ptlrpc_hr_service *hr)
2374 int n, cpu, threads_started = 0;
2377 LASSERT(hr != NULL);
2378 LASSERT(hr->hr_n_threads > 0);
2380 for (n = 0, cpu = 0; n < hr->hr_n_threads; n++) {
2381 #if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK)
2382 while(!cfs_cpu_online(cpu)) {
2384 if (cpu >= cfs_num_possible_cpus())
2388 rc = ptlrpc_start_hr_thread(hr, n, cpu);
2394 if (threads_started == 0) {
2395 CERROR("No reply handling threads started\n");
2398 if (threads_started < hr->hr_n_threads) {
2399 CWARN("Started only %d reply handling threads from %d\n",
2400 threads_started, hr->hr_n_threads);
2401 hr->hr_n_threads = threads_started;
2406 static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
2407 struct ptlrpc_thread *thread)
2409 struct l_wait_info lwi = { 0 };
2412 CDEBUG(D_RPCTRACE, "Stopping thread [ %p : %u ]\n",
2413 thread, thread->t_pid);
2415 cfs_spin_lock(&svc->srv_lock);
2416 /* let the thread know that we would like it to stop asap */
2417 thread->t_flags |= SVC_STOPPING;
2418 cfs_spin_unlock(&svc->srv_lock);
2420 cfs_waitq_broadcast(&svc->srv_waitq);
2421 l_wait_event(thread->t_ctl_waitq,
2422 (thread->t_flags & SVC_STOPPED), &lwi);
2424 cfs_spin_lock(&svc->srv_lock);
2425 cfs_list_del(&thread->t_link);
2426 cfs_spin_unlock(&svc->srv_lock);
2428 OBD_FREE_PTR(thread);
2433 * Stops all threads of a particular service \a svc
2435 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
2437 struct ptlrpc_thread *thread;
2440 cfs_spin_lock(&svc->srv_lock);
2441 while (!cfs_list_empty(&svc->srv_threads)) {
2442 thread = cfs_list_entry(svc->srv_threads.next,
2443 struct ptlrpc_thread, t_link);
2445 cfs_spin_unlock(&svc->srv_lock);
2446 ptlrpc_stop_thread(svc, thread);
2447 cfs_spin_lock(&svc->srv_lock);
2450 cfs_spin_unlock(&svc->srv_lock);
2454 int ptlrpc_start_threads(struct ptlrpc_service *svc)
2459 /* We require 2 threads min - see note in
2460 ptlrpc_server_handle_request */
2461 LASSERT(svc->srv_threads_min >= 2);
2462 for (i = 0; i < svc->srv_threads_min; i++) {
2463 rc = ptlrpc_start_thread(svc);
2464 /* We have enough threads, don't start more. b=15759 */
2465 if (rc == -EMFILE) {
2470 CERROR("cannot start %s thread #%d: rc %d\n",
2471 svc->srv_thread_name, i, rc);
2472 ptlrpc_stop_all_threads(svc);
2479 int ptlrpc_start_thread(struct ptlrpc_service *svc)
2481 struct l_wait_info lwi = { 0 };
2482 struct ptlrpc_svc_data d;
2483 struct ptlrpc_thread *thread;
2488 CDEBUG(D_RPCTRACE, "%s started %d min %d max %d running %d\n",
2489 svc->srv_name, svc->srv_threads_running, svc->srv_threads_min,
2490 svc->srv_threads_max, svc->srv_threads_running);
2492 if (unlikely(svc->srv_is_stopping))
2495 if (!ptlrpc_threads_increasable(svc) ||
2496 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
2497 svc->srv_threads_running == svc->srv_threads_min - 1))
2500 OBD_ALLOC_PTR(thread);
2503 cfs_waitq_init(&thread->t_ctl_waitq);
2505 cfs_spin_lock(&svc->srv_lock);
2506 if (!ptlrpc_threads_increasable(svc)) {
2507 cfs_spin_unlock(&svc->srv_lock);
2508 OBD_FREE_PTR(thread);
2512 svc->srv_threads_starting++;
2513 thread->t_id = svc->srv_threads_next_id++;
2514 thread->t_flags |= SVC_STARTING;
2515 thread->t_svc = svc;
2517 cfs_list_add(&thread->t_link, &svc->srv_threads);
2518 cfs_spin_unlock(&svc->srv_lock);
2520 sprintf(name, "%s_%02d", svc->srv_thread_name, thread->t_id);
2525 CDEBUG(D_RPCTRACE, "starting thread '%s'\n", name);
2527 /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
2528 * just drop the VM and FILES in cfs_daemonize_ctxt() right away.
2530 rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
2532 CERROR("cannot start thread '%s': rc %d\n", name, rc);
2534 cfs_spin_lock(&svc->srv_lock);
2535 cfs_list_del(&thread->t_link);
2536 --svc->srv_threads_starting;
2537 cfs_spin_unlock(&svc->srv_lock);
2539 OBD_FREE(thread, sizeof(*thread));
2542 l_wait_event(thread->t_ctl_waitq,
2543 thread->t_flags & (SVC_RUNNING | SVC_STOPPED), &lwi);
2545 rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
2550 int ptlrpc_hr_init(void)
2553 int n_cpus = cfs_num_online_cpus();
2554 struct ptlrpc_hr_service *hr;
2559 LASSERT(ptlrpc_hr == NULL);
2561 size = offsetof(struct ptlrpc_hr_service, hr_threads[n_cpus]);
2562 OBD_ALLOC(hr, size);
2565 for (i = 0; i < n_cpus; i++) {
2566 struct ptlrpc_hr_thread *t = &hr->hr_threads[i];
2568 cfs_spin_lock_init(&t->hrt_lock);
2569 cfs_waitq_init(&t->hrt_wait);
2570 CFS_INIT_LIST_HEAD(&t->hrt_queue);
2571 cfs_init_completion(&t->hrt_completion);
2573 hr->hr_n_threads = n_cpus;
2577 rc = ptlrpc_start_hr_threads(hr);
2579 OBD_FREE(hr, hr->hr_size);
2585 void ptlrpc_hr_fini(void)
2587 if (ptlrpc_hr != NULL) {
2588 ptlrpc_stop_hr_threads(ptlrpc_hr);
2589 OBD_FREE(ptlrpc_hr, ptlrpc_hr->hr_size);
2594 #endif /* __KERNEL__ */
2597 * Wait until all already scheduled replies are processed.
2599 static void ptlrpc_wait_replies(struct ptlrpc_service *svc)
2603 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
2605 rc = l_wait_event(svc->srv_waitq, cfs_atomic_read(&svc-> \
2606 srv_n_difficult_replies) == 0,
2610 CWARN("Unexpectedly long timeout %p\n", svc);
2614 int ptlrpc_unregister_service(struct ptlrpc_service *service)
2617 struct l_wait_info lwi;
2619 struct ptlrpc_reply_state *rs, *t;
2620 struct ptlrpc_at_array *array = &service->srv_at_array;
2623 service->srv_is_stopping = 1;
2624 cfs_timer_disarm(&service->srv_at_timer);
2626 ptlrpc_stop_all_threads(service);
2627 LASSERT(cfs_list_empty(&service->srv_threads));
2629 cfs_spin_lock (&ptlrpc_all_services_lock);
2630 cfs_list_del_init (&service->srv_list);
2631 cfs_spin_unlock (&ptlrpc_all_services_lock);
2633 ptlrpc_lprocfs_unregister_service(service);
2635 /* All history will be culled when the next request buffer is
2637 service->srv_max_history_rqbds = 0;
2639 CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
2641 rc = LNetClearLazyPortal(service->srv_req_portal);
2644 /* Unlink all the request buffers. This forces a 'final' event with
2645 * its 'unlink' flag set for each posted rqbd */
2646 cfs_list_for_each(tmp, &service->srv_active_rqbds) {
2647 struct ptlrpc_request_buffer_desc *rqbd =
2648 cfs_list_entry(tmp, struct ptlrpc_request_buffer_desc,
2651 rc = LNetMDUnlink(rqbd->rqbd_md_h);
2652 LASSERT (rc == 0 || rc == -ENOENT);
2655 /* Wait for the network to release any buffers it's currently
2658 cfs_spin_lock(&service->srv_lock);
2659 rc = service->srv_nrqbd_receiving;
2660 cfs_spin_unlock(&service->srv_lock);
2665 /* Network access will complete in finite time but the HUGE
2666 * timeout lets us CWARN for visibility of sluggish NALs */
2667 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
2668 cfs_time_seconds(1), NULL, NULL);
2669 rc = l_wait_event(service->srv_waitq,
2670 service->srv_nrqbd_receiving == 0,
2672 if (rc == -ETIMEDOUT)
2673 CWARN("Service %s waiting for request buffers\n",
2677 /* schedule all outstanding replies to terminate them */
2678 cfs_spin_lock(&service->srv_rs_lock);
2679 while (!cfs_list_empty(&service->srv_active_replies)) {
2680 struct ptlrpc_reply_state *rs =
2681 cfs_list_entry(service->srv_active_replies.next,
2682 struct ptlrpc_reply_state, rs_list);
2683 cfs_spin_lock(&rs->rs_lock);
2684 ptlrpc_schedule_difficult_reply(rs);
2685 cfs_spin_unlock(&rs->rs_lock);
2687 cfs_spin_unlock(&service->srv_rs_lock);
2689 /* purge the request queue. NB No new replies (rqbds all unlinked)
2690 * and no service threads, so I'm the only thread noodling the
2691 * request queue now */
2692 while (!cfs_list_empty(&service->srv_req_in_queue)) {
2693 struct ptlrpc_request *req =
2694 cfs_list_entry(service->srv_req_in_queue.next,
2695 struct ptlrpc_request,
2698 cfs_list_del(&req->rq_list);
2699 service->srv_n_queued_reqs--;
2700 service->srv_n_active_reqs++;
2701 ptlrpc_server_finish_request(service, req);
2703 while (ptlrpc_server_request_pending(service, 1)) {
2704 struct ptlrpc_request *req;
2706 req = ptlrpc_server_request_get(service, 1);
2707 cfs_list_del(&req->rq_list);
2708 service->srv_n_queued_reqs--;
2709 service->srv_n_active_reqs++;
2710 ptlrpc_hpreq_fini(req);
2711 ptlrpc_server_finish_request(service, req);
2713 LASSERT(service->srv_n_queued_reqs == 0);
2714 LASSERT(service->srv_n_active_reqs == 0);
2715 LASSERT(service->srv_n_history_rqbds == 0);
2716 LASSERT(cfs_list_empty(&service->srv_active_rqbds));
2718 /* Now free all the request buffers since nothing references them
2720 while (!cfs_list_empty(&service->srv_idle_rqbds)) {
2721 struct ptlrpc_request_buffer_desc *rqbd =
2722 cfs_list_entry(service->srv_idle_rqbds.next,
2723 struct ptlrpc_request_buffer_desc,
2726 ptlrpc_free_rqbd(rqbd);
2729 ptlrpc_wait_replies(service);
2731 cfs_list_for_each_entry_safe(rs, t, &service->srv_free_rs_list,
2733 cfs_list_del(&rs->rs_list);
2734 OBD_FREE(rs, service->srv_max_reply_size);
2737 /* In case somebody rearmed this in the meantime */
2738 cfs_timer_disarm(&service->srv_at_timer);
2740 if (array->paa_reqs_array != NULL) {
2741 OBD_FREE(array->paa_reqs_array,
2742 sizeof(cfs_list_t) * array->paa_size);
2743 array->paa_reqs_array = NULL;
2746 if (array->paa_reqs_count != NULL) {
2747 OBD_FREE(array->paa_reqs_count,
2748 sizeof(__u32) * array->paa_size);
2749 array->paa_reqs_count= NULL;
2752 OBD_FREE_PTR(service);
2757 * Returns 0 if the service is healthy.
2759 * Right now, it just checks to make sure that requests aren't languishing
2760 * in the queue. We'll use this health check to govern whether a node needs
2761 * to be shot, so it's intentionally non-aggressive. */
2762 int ptlrpc_service_health_check(struct ptlrpc_service *svc)
2764 struct ptlrpc_request *request;
2765 struct timeval right_now;
2771 cfs_gettimeofday(&right_now);
2773 cfs_spin_lock(&svc->srv_rq_lock);
2774 if (!ptlrpc_server_request_pending(svc, 1)) {
2775 cfs_spin_unlock(&svc->srv_rq_lock);
2779 /* How long has the next entry been waiting? */
2780 if (cfs_list_empty(&svc->srv_request_queue))
2781 request = cfs_list_entry(svc->srv_request_hpq.next,
2782 struct ptlrpc_request, rq_list);
2784 request = cfs_list_entry(svc->srv_request_queue.next,
2785 struct ptlrpc_request, rq_list);
2786 timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
2787 cfs_spin_unlock(&svc->srv_rq_lock);
2789 if ((timediff / ONE_MILLION) > (AT_OFF ? obd_timeout * 3/2 :
2791 CERROR("%s: unhealthy - request has been waiting %lds\n",
2792 svc->srv_name, timediff / ONE_MILLION);