4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2010, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #define DEBUG_SUBSYSTEM S_RPC
34 #include "../include/obd_support.h"
35 #include "../include/obd_class.h"
36 #include "../include/lustre_net.h"
37 #include "../include/lu_object.h"
38 #include "../../include/linux/lnet/types.h"
39 #include "ptlrpc_internal.h"
41 /* The following are visible and mutable through /sys/module/ptlrpc */
42 int test_req_buffer_pressure
;
43 module_param(test_req_buffer_pressure
, int, 0444);
44 MODULE_PARM_DESC(test_req_buffer_pressure
, "set non-zero to put pressure on request buffer pools");
45 module_param(at_min
, int, 0644);
46 MODULE_PARM_DESC(at_min
, "Adaptive timeout minimum (sec)");
47 module_param(at_max
, int, 0644);
48 MODULE_PARM_DESC(at_max
, "Adaptive timeout maximum (sec)");
49 module_param(at_history
, int, 0644);
50 MODULE_PARM_DESC(at_history
,
51 "Adaptive timeouts remember the slowest event that took place within this period (sec)");
52 module_param(at_early_margin
, int, 0644);
53 MODULE_PARM_DESC(at_early_margin
, "How soon before an RPC deadline to send an early reply");
54 module_param(at_extra
, int, 0644);
55 MODULE_PARM_DESC(at_extra
, "How much extra time to give with each early reply");
58 static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part
*svcpt
);
59 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request
*req
);
60 static void ptlrpc_at_remove_timed(struct ptlrpc_request
*req
);
62 /** Holds a list of all PTLRPC services */
63 LIST_HEAD(ptlrpc_all_services
);
64 /** Used to protect the \e ptlrpc_all_services list */
65 struct mutex ptlrpc_all_services_mutex
;
67 static struct ptlrpc_request_buffer_desc
*
68 ptlrpc_alloc_rqbd(struct ptlrpc_service_part
*svcpt
)
70 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
71 struct ptlrpc_request_buffer_desc
*rqbd
;
73 rqbd
= kzalloc_node(sizeof(*rqbd
), GFP_NOFS
,
74 cfs_cpt_spread_node(svc
->srv_cptable
,
79 rqbd
->rqbd_svcpt
= svcpt
;
80 rqbd
->rqbd_refcount
= 0;
81 rqbd
->rqbd_cbid
.cbid_fn
= request_in_callback
;
82 rqbd
->rqbd_cbid
.cbid_arg
= rqbd
;
83 INIT_LIST_HEAD(&rqbd
->rqbd_reqs
);
84 rqbd
->rqbd_buffer
= libcfs_kvzalloc_cpt(svc
->srv_cptable
,
88 if (!rqbd
->rqbd_buffer
) {
93 spin_lock(&svcpt
->scp_lock
);
94 list_add(&rqbd
->rqbd_list
, &svcpt
->scp_rqbd_idle
);
95 svcpt
->scp_nrqbds_total
++;
96 spin_unlock(&svcpt
->scp_lock
);
102 ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc
*rqbd
)
104 struct ptlrpc_service_part
*svcpt
= rqbd
->rqbd_svcpt
;
106 LASSERT(rqbd
->rqbd_refcount
== 0);
107 LASSERT(list_empty(&rqbd
->rqbd_reqs
));
109 spin_lock(&svcpt
->scp_lock
);
110 list_del(&rqbd
->rqbd_list
);
111 svcpt
->scp_nrqbds_total
--;
112 spin_unlock(&svcpt
->scp_lock
);
114 kvfree(rqbd
->rqbd_buffer
);
119 ptlrpc_grow_req_bufs(struct ptlrpc_service_part
*svcpt
, int post
)
121 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
122 struct ptlrpc_request_buffer_desc
*rqbd
;
126 if (svcpt
->scp_rqbd_allocating
)
129 spin_lock(&svcpt
->scp_lock
);
130 /* check again with lock */
131 if (svcpt
->scp_rqbd_allocating
) {
132 /* NB: we might allow more than one thread in the future */
133 LASSERT(svcpt
->scp_rqbd_allocating
== 1);
134 spin_unlock(&svcpt
->scp_lock
);
138 svcpt
->scp_rqbd_allocating
++;
139 spin_unlock(&svcpt
->scp_lock
);
141 for (i
= 0; i
< svc
->srv_nbuf_per_group
; i
++) {
142 /* NB: another thread might have recycled enough rqbds, we
143 * need to make sure it wouldn't over-allocate, see LU-1212.
145 if (svcpt
->scp_nrqbds_posted
>= svc
->srv_nbuf_per_group
)
148 rqbd
= ptlrpc_alloc_rqbd(svcpt
);
151 CERROR("%s: Can't allocate request buffer\n",
158 spin_lock(&svcpt
->scp_lock
);
160 LASSERT(svcpt
->scp_rqbd_allocating
== 1);
161 svcpt
->scp_rqbd_allocating
--;
163 spin_unlock(&svcpt
->scp_lock
);
166 "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n",
167 svc
->srv_name
, i
, svc
->srv_buf_size
, svcpt
->scp_nrqbds_posted
,
168 svcpt
->scp_nrqbds_total
, rc
);
172 rc
= ptlrpc_server_post_idle_rqbds(svcpt
);
177 struct ptlrpc_hr_partition
;
179 struct ptlrpc_hr_thread
{
180 int hrt_id
; /* thread ID */
182 wait_queue_head_t hrt_waitq
;
183 struct list_head hrt_queue
; /* RS queue */
184 struct ptlrpc_hr_partition
*hrt_partition
;
187 struct ptlrpc_hr_partition
{
188 /* # of started threads */
189 atomic_t hrp_nstarted
;
190 /* # of stopped threads */
191 atomic_t hrp_nstopped
;
192 /* cpu partition id */
194 /* round-robin rotor for choosing thread */
196 /* total number of threads on this partition */
199 struct ptlrpc_hr_thread
*hrp_thrs
;
202 #define HRT_RUNNING 0
203 #define HRT_STOPPING 1
205 struct ptlrpc_hr_service
{
206 /* CPU partition table, it's just cfs_cpt_table for now */
207 struct cfs_cpt_table
*hr_cpt_table
;
208 /** controller sleep waitq */
209 wait_queue_head_t hr_waitq
;
210 unsigned int hr_stopping
;
211 /** roundrobin rotor for non-affinity service */
212 unsigned int hr_rotor
;
214 struct ptlrpc_hr_partition
**hr_partitions
;
217 /** reply handling service. */
218 static struct ptlrpc_hr_service ptlrpc_hr
;
221 * Choose an hr thread to dispatch requests to.
223 static struct ptlrpc_hr_thread
*
224 ptlrpc_hr_select(struct ptlrpc_service_part
*svcpt
)
226 struct ptlrpc_hr_partition
*hrp
;
229 if (svcpt
->scp_cpt
>= 0 &&
230 svcpt
->scp_service
->srv_cptable
== ptlrpc_hr
.hr_cpt_table
) {
231 /* directly match partition */
232 hrp
= ptlrpc_hr
.hr_partitions
[svcpt
->scp_cpt
];
235 rotor
= ptlrpc_hr
.hr_rotor
++;
236 rotor
%= cfs_cpt_number(ptlrpc_hr
.hr_cpt_table
);
238 hrp
= ptlrpc_hr
.hr_partitions
[rotor
];
241 rotor
= hrp
->hrp_rotor
++;
242 return &hrp
->hrp_thrs
[rotor
% hrp
->hrp_nthrs
];
246 * Put reply state into a queue for processing because we received
247 * ACK from the client
249 void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state
*rs
)
251 struct ptlrpc_hr_thread
*hrt
;
253 LASSERT(list_empty(&rs
->rs_list
));
255 hrt
= ptlrpc_hr_select(rs
->rs_svcpt
);
257 spin_lock(&hrt
->hrt_lock
);
258 list_add_tail(&rs
->rs_list
, &hrt
->hrt_queue
);
259 spin_unlock(&hrt
->hrt_lock
);
261 wake_up(&hrt
->hrt_waitq
);
265 ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state
*rs
)
267 assert_spin_locked(&rs
->rs_svcpt
->scp_rep_lock
);
268 assert_spin_locked(&rs
->rs_lock
);
269 LASSERT(rs
->rs_difficult
);
270 rs
->rs_scheduled_ever
= 1; /* flag any notification attempt */
272 if (rs
->rs_scheduled
) { /* being set up or already notified */
276 rs
->rs_scheduled
= 1;
277 list_del_init(&rs
->rs_list
);
278 ptlrpc_dispatch_difficult_reply(rs
);
280 EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply
);
283 ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part
*svcpt
)
285 struct ptlrpc_request_buffer_desc
*rqbd
;
290 spin_lock(&svcpt
->scp_lock
);
292 if (list_empty(&svcpt
->scp_rqbd_idle
)) {
293 spin_unlock(&svcpt
->scp_lock
);
297 rqbd
= list_entry(svcpt
->scp_rqbd_idle
.next
,
298 struct ptlrpc_request_buffer_desc
,
300 list_del(&rqbd
->rqbd_list
);
302 /* assume we will post successfully */
303 svcpt
->scp_nrqbds_posted
++;
304 list_add(&rqbd
->rqbd_list
, &svcpt
->scp_rqbd_posted
);
306 spin_unlock(&svcpt
->scp_lock
);
308 rc
= ptlrpc_register_rqbd(rqbd
);
315 spin_lock(&svcpt
->scp_lock
);
317 svcpt
->scp_nrqbds_posted
--;
318 list_del(&rqbd
->rqbd_list
);
319 list_add_tail(&rqbd
->rqbd_list
, &svcpt
->scp_rqbd_idle
);
321 /* Don't complain if no request buffers are posted right now; LNET
322 * won't drop requests because we set the portal lazy!
325 spin_unlock(&svcpt
->scp_lock
);
330 static void ptlrpc_at_timer(unsigned long castmeharder
)
332 struct ptlrpc_service_part
*svcpt
;
334 svcpt
= (struct ptlrpc_service_part
*)castmeharder
;
336 svcpt
->scp_at_check
= 1;
337 svcpt
->scp_at_checktime
= cfs_time_current();
338 wake_up(&svcpt
->scp_waitq
);
342 ptlrpc_server_nthreads_check(struct ptlrpc_service
*svc
,
343 struct ptlrpc_service_conf
*conf
)
345 struct ptlrpc_service_thr_conf
*tc
= &conf
->psc_thr
;
352 * Common code for estimating & validating threads number.
353 * CPT affinity service could have percpt thread-pool instead
354 * of a global thread-pool, which means user might not always
355 * get the threads number they give it in conf::tc_nthrs_user
356 * even they did set. It's because we need to validate threads
357 * number for each CPT to guarantee each pool will have enough
358 * threads to keep the service healthy.
360 init
= PTLRPC_NTHRS_INIT
+ (svc
->srv_ops
.so_hpreq_handler
!= NULL
);
361 init
= max_t(int, init
, tc
->tc_nthrs_init
);
363 /* NB: please see comments in lustre_lnet.h for definition
364 * details of these members
366 LASSERT(tc
->tc_nthrs_max
!= 0);
368 if (tc
->tc_nthrs_user
!= 0) {
369 /* In case there is a reason to test a service with many
370 * threads, we give a less strict check here, it can
371 * be up to 8 * nthrs_max
373 total
= min(tc
->tc_nthrs_max
* 8, tc
->tc_nthrs_user
);
374 nthrs
= total
/ svc
->srv_ncpts
;
375 init
= max(init
, nthrs
);
379 total
= tc
->tc_nthrs_max
;
380 if (tc
->tc_nthrs_base
== 0) {
381 /* don't care about base threads number per partition,
382 * this is most for non-affinity service
384 nthrs
= total
/ svc
->srv_ncpts
;
388 nthrs
= tc
->tc_nthrs_base
;
389 if (svc
->srv_ncpts
== 1) {
392 /* NB: Increase the base number if it's single partition
393 * and total number of cores/HTs is larger or equal to 4.
394 * result will always < 2 * nthrs_base
396 weight
= cfs_cpt_weight(svc
->srv_cptable
, CFS_CPT_ANY
);
397 for (i
= 1; (weight
>> (i
+ 1)) != 0 && /* >= 4 cores/HTs */
398 (tc
->tc_nthrs_base
>> i
) != 0; i
++)
399 nthrs
+= tc
->tc_nthrs_base
>> i
;
402 if (tc
->tc_thr_factor
!= 0) {
403 int factor
= tc
->tc_thr_factor
;
407 * User wants to increase number of threads with for
408 * each CPU core/HT, most likely the factor is larger then
409 * one thread/core because service threads are supposed to
410 * be blocked by lock or wait for IO.
413 * Amdahl's law says that adding processors wouldn't give
414 * a linear increasing of parallelism, so it's nonsense to
415 * have too many threads no matter how many cores/HTs
418 /* weight is # of HTs */
419 if (cpumask_weight(topology_sibling_cpumask(0)) > 1) {
420 /* depress thread factor for hyper-thread */
421 factor
= factor
- (factor
>> 1) + (factor
>> 3);
424 weight
= cfs_cpt_weight(svc
->srv_cptable
, 0);
427 for (; factor
> 0 && weight
> 0; factor
--, weight
-= fade
)
428 nthrs
+= min(weight
, fade
) * factor
;
431 if (nthrs
* svc
->srv_ncpts
> tc
->tc_nthrs_max
) {
432 nthrs
= max(tc
->tc_nthrs_base
,
433 tc
->tc_nthrs_max
/ svc
->srv_ncpts
);
436 nthrs
= max(nthrs
, tc
->tc_nthrs_init
);
437 svc
->srv_nthrs_cpt_limit
= nthrs
;
438 svc
->srv_nthrs_cpt_init
= init
;
440 if (nthrs
* svc
->srv_ncpts
> tc
->tc_nthrs_max
) {
441 CDEBUG(D_OTHER
, "%s: This service may have more threads (%d) than the given soft limit (%d)\n",
442 svc
->srv_name
, nthrs
* svc
->srv_ncpts
,
448 * Initialize percpt data for a service
451 ptlrpc_service_part_init(struct ptlrpc_service
*svc
,
452 struct ptlrpc_service_part
*svcpt
, int cpt
)
454 struct ptlrpc_at_array
*array
;
459 svcpt
->scp_cpt
= cpt
;
460 INIT_LIST_HEAD(&svcpt
->scp_threads
);
462 /* rqbd and incoming request queue */
463 spin_lock_init(&svcpt
->scp_lock
);
464 INIT_LIST_HEAD(&svcpt
->scp_rqbd_idle
);
465 INIT_LIST_HEAD(&svcpt
->scp_rqbd_posted
);
466 INIT_LIST_HEAD(&svcpt
->scp_req_incoming
);
467 init_waitqueue_head(&svcpt
->scp_waitq
);
468 /* history request & rqbd list */
469 INIT_LIST_HEAD(&svcpt
->scp_hist_reqs
);
470 INIT_LIST_HEAD(&svcpt
->scp_hist_rqbds
);
472 /* active requests and hp requests */
473 spin_lock_init(&svcpt
->scp_req_lock
);
476 spin_lock_init(&svcpt
->scp_rep_lock
);
477 INIT_LIST_HEAD(&svcpt
->scp_rep_active
);
478 INIT_LIST_HEAD(&svcpt
->scp_rep_idle
);
479 init_waitqueue_head(&svcpt
->scp_rep_waitq
);
480 atomic_set(&svcpt
->scp_nreps_difficult
, 0);
482 /* adaptive timeout */
483 spin_lock_init(&svcpt
->scp_at_lock
);
484 array
= &svcpt
->scp_at_array
;
486 size
= at_est2timeout(at_max
);
487 array
->paa_size
= size
;
488 array
->paa_count
= 0;
489 array
->paa_deadline
= -1;
491 /* allocate memory for scp_at_array (ptlrpc_at_array) */
492 array
->paa_reqs_array
=
493 kzalloc_node(sizeof(struct list_head
) * size
, GFP_NOFS
,
494 cfs_cpt_spread_node(svc
->srv_cptable
, cpt
));
495 if (!array
->paa_reqs_array
)
498 for (index
= 0; index
< size
; index
++)
499 INIT_LIST_HEAD(&array
->paa_reqs_array
[index
]);
501 array
->paa_reqs_count
=
502 kzalloc_node(sizeof(__u32
) * size
, GFP_NOFS
,
503 cfs_cpt_spread_node(svc
->srv_cptable
, cpt
));
504 if (!array
->paa_reqs_count
)
505 goto free_reqs_array
;
507 setup_timer(&svcpt
->scp_at_timer
, ptlrpc_at_timer
,
508 (unsigned long)svcpt
);
510 /* At SOW, service time should be quick; 10s seems generous. If client
511 * timeout is less than this, we'll be sending an early reply.
513 at_init(&svcpt
->scp_at_estimate
, 10, 0);
515 /* assign this before call ptlrpc_grow_req_bufs */
516 svcpt
->scp_service
= svc
;
517 /* Now allocate the request buffers, but don't post them now */
518 rc
= ptlrpc_grow_req_bufs(svcpt
, 0);
519 /* We shouldn't be under memory pressure at startup, so
520 * fail if we can't allocate all our buffers at this time.
523 goto free_reqs_count
;
528 kfree(array
->paa_reqs_count
);
529 array
->paa_reqs_count
= NULL
;
531 kfree(array
->paa_reqs_array
);
532 array
->paa_reqs_array
= NULL
;
538 * Initialize service on a given portal.
539 * This includes starting serving threads , allocating and posting rqbds and
542 struct ptlrpc_service
*
543 ptlrpc_register_service(struct ptlrpc_service_conf
*conf
,
545 struct dentry
*debugfs_entry
)
547 struct ptlrpc_service_cpt_conf
*cconf
= &conf
->psc_cpt
;
548 struct ptlrpc_service
*service
;
549 struct ptlrpc_service_part
*svcpt
;
550 struct cfs_cpt_table
*cptable
;
557 LASSERT(conf
->psc_buf
.bc_nbufs
> 0);
558 LASSERT(conf
->psc_buf
.bc_buf_size
>=
559 conf
->psc_buf
.bc_req_max_size
+ SPTLRPC_MAX_PAYLOAD
);
560 LASSERT(conf
->psc_thr
.tc_ctx_tags
!= 0);
562 cptable
= cconf
->cc_cptable
;
564 cptable
= cfs_cpt_table
;
566 if (!conf
->psc_thr
.tc_cpu_affinity
) {
569 ncpts
= cfs_cpt_number(cptable
);
570 if (cconf
->cc_pattern
) {
571 struct cfs_expr_list
*el
;
573 rc
= cfs_expr_list_parse(cconf
->cc_pattern
,
574 strlen(cconf
->cc_pattern
),
577 CERROR("%s: invalid CPT pattern string: %s",
578 conf
->psc_name
, cconf
->cc_pattern
);
579 return ERR_PTR(-EINVAL
);
582 rc
= cfs_expr_list_values(el
, ncpts
, &cpts
);
583 cfs_expr_list_free(el
);
585 CERROR("%s: failed to parse CPT array %s: %d\n",
586 conf
->psc_name
, cconf
->cc_pattern
, rc
);
588 return ERR_PTR(rc
< 0 ? rc
: -EINVAL
);
594 service
= kzalloc(offsetof(struct ptlrpc_service
, srv_parts
[ncpts
]),
598 return ERR_PTR(-ENOMEM
);
601 service
->srv_cptable
= cptable
;
602 service
->srv_cpts
= cpts
;
603 service
->srv_ncpts
= ncpts
;
605 service
->srv_cpt_bits
= 0; /* it's zero already, easy to read... */
606 while ((1 << service
->srv_cpt_bits
) < cfs_cpt_number(cptable
))
607 service
->srv_cpt_bits
++;
610 spin_lock_init(&service
->srv_lock
);
611 service
->srv_name
= conf
->psc_name
;
612 service
->srv_watchdog_factor
= conf
->psc_watchdog_factor
;
613 INIT_LIST_HEAD(&service
->srv_list
); /* for safety of cleanup */
615 /* buffer configuration */
616 service
->srv_nbuf_per_group
= test_req_buffer_pressure
?
617 1 : conf
->psc_buf
.bc_nbufs
;
618 service
->srv_max_req_size
= conf
->psc_buf
.bc_req_max_size
+
620 service
->srv_buf_size
= conf
->psc_buf
.bc_buf_size
;
621 service
->srv_rep_portal
= conf
->psc_buf
.bc_rep_portal
;
622 service
->srv_req_portal
= conf
->psc_buf
.bc_req_portal
;
624 /* Increase max reply size to next power of two */
625 service
->srv_max_reply_size
= 1;
626 while (service
->srv_max_reply_size
<
627 conf
->psc_buf
.bc_rep_max_size
+ SPTLRPC_MAX_PAYLOAD
)
628 service
->srv_max_reply_size
<<= 1;
630 service
->srv_thread_name
= conf
->psc_thr
.tc_thr_name
;
631 service
->srv_ctx_tags
= conf
->psc_thr
.tc_ctx_tags
;
632 service
->srv_hpreq_ratio
= PTLRPC_SVC_HP_RATIO
;
633 service
->srv_ops
= conf
->psc_ops
;
635 for (i
= 0; i
< ncpts
; i
++) {
636 if (!conf
->psc_thr
.tc_cpu_affinity
)
639 cpt
= cpts
? cpts
[i
] : i
;
641 svcpt
= kzalloc_node(sizeof(*svcpt
), GFP_NOFS
,
642 cfs_cpt_spread_node(cptable
, cpt
));
648 service
->srv_parts
[i
] = svcpt
;
649 rc
= ptlrpc_service_part_init(service
, svcpt
, cpt
);
654 ptlrpc_server_nthreads_check(service
, conf
);
656 rc
= LNetSetLazyPortal(service
->srv_req_portal
);
659 mutex_lock(&ptlrpc_all_services_mutex
);
660 list_add(&service
->srv_list
, &ptlrpc_all_services
);
661 mutex_unlock(&ptlrpc_all_services_mutex
);
664 rc
= ptlrpc_sysfs_register_service(parent
, service
);
669 if (!IS_ERR_OR_NULL(debugfs_entry
))
670 ptlrpc_ldebugfs_register_service(debugfs_entry
, service
);
672 rc
= ptlrpc_service_nrs_setup(service
);
676 CDEBUG(D_NET
, "%s: Started, listening on portal %d\n",
677 service
->srv_name
, service
->srv_req_portal
);
679 rc
= ptlrpc_start_threads(service
);
681 CERROR("Failed to start threads for service %s: %d\n",
682 service
->srv_name
, rc
);
688 ptlrpc_unregister_service(service
);
691 EXPORT_SYMBOL(ptlrpc_register_service
);
694 * to actually free the request, must be called without holding svc_lock.
695 * note it's caller's responsibility to unlink req->rq_list.
697 static void ptlrpc_server_free_request(struct ptlrpc_request
*req
)
699 LASSERT(atomic_read(&req
->rq_refcount
) == 0);
700 LASSERT(list_empty(&req
->rq_timed_list
));
702 /* DEBUG_REQ() assumes the reply state of a request with a valid
703 * ref will not be destroyed until that reference is dropped.
705 ptlrpc_req_drop_rs(req
);
707 sptlrpc_svc_ctx_decref(req
);
709 if (req
!= &req
->rq_rqbd
->rqbd_req
) {
710 /* NB request buffers use an embedded
711 * req if the incoming req unlinked the
712 * MD; this isn't one of them!
714 ptlrpc_request_cache_free(req
);
719 * drop a reference count of the request. if it reaches 0, we either
720 * put it into history list, or free it immediately.
722 static void ptlrpc_server_drop_request(struct ptlrpc_request
*req
)
724 struct ptlrpc_request_buffer_desc
*rqbd
= req
->rq_rqbd
;
725 struct ptlrpc_service_part
*svcpt
= rqbd
->rqbd_svcpt
;
726 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
728 struct list_head
*tmp
;
729 struct list_head
*nxt
;
731 if (!atomic_dec_and_test(&req
->rq_refcount
))
734 if (req
->rq_at_linked
) {
735 spin_lock(&svcpt
->scp_at_lock
);
736 /* recheck with lock, in case it's unlinked by
737 * ptlrpc_at_check_timed()
739 if (likely(req
->rq_at_linked
))
740 ptlrpc_at_remove_timed(req
);
741 spin_unlock(&svcpt
->scp_at_lock
);
744 LASSERT(list_empty(&req
->rq_timed_list
));
746 /* finalize request */
747 if (req
->rq_export
) {
748 class_export_put(req
->rq_export
);
749 req
->rq_export
= NULL
;
752 spin_lock(&svcpt
->scp_lock
);
754 list_add(&req
->rq_list
, &rqbd
->rqbd_reqs
);
756 refcount
= --(rqbd
->rqbd_refcount
);
758 /* request buffer is now idle: add to history */
759 list_del(&rqbd
->rqbd_list
);
761 list_add_tail(&rqbd
->rqbd_list
, &svcpt
->scp_hist_rqbds
);
762 svcpt
->scp_hist_nrqbds
++;
764 /* cull some history?
765 * I expect only about 1 or 2 rqbds need to be recycled here
767 while (svcpt
->scp_hist_nrqbds
> svc
->srv_hist_nrqbds_cpt_max
) {
768 rqbd
= list_entry(svcpt
->scp_hist_rqbds
.next
,
769 struct ptlrpc_request_buffer_desc
,
772 list_del(&rqbd
->rqbd_list
);
773 svcpt
->scp_hist_nrqbds
--;
775 /* remove rqbd's reqs from svc's req history while
776 * I've got the service lock
778 list_for_each(tmp
, &rqbd
->rqbd_reqs
) {
779 req
= list_entry(tmp
, struct ptlrpc_request
,
781 /* Track the highest culled req seq */
782 if (req
->rq_history_seq
>
783 svcpt
->scp_hist_seq_culled
) {
784 svcpt
->scp_hist_seq_culled
=
787 list_del(&req
->rq_history_list
);
790 spin_unlock(&svcpt
->scp_lock
);
792 list_for_each_safe(tmp
, nxt
, &rqbd
->rqbd_reqs
) {
793 req
= list_entry(rqbd
->rqbd_reqs
.next
,
794 struct ptlrpc_request
,
796 list_del(&req
->rq_list
);
797 ptlrpc_server_free_request(req
);
800 spin_lock(&svcpt
->scp_lock
);
802 * now all reqs including the embedded req has been
803 * disposed, schedule request buffer for re-use.
805 LASSERT(atomic_read(&rqbd
->rqbd_req
.rq_refcount
) ==
807 list_add_tail(&rqbd
->rqbd_list
, &svcpt
->scp_rqbd_idle
);
810 spin_unlock(&svcpt
->scp_lock
);
811 } else if (req
->rq_reply_state
&& req
->rq_reply_state
->rs_prealloc
) {
812 /* If we are low on memory, we are not interested in history */
813 list_del(&req
->rq_list
);
814 list_del_init(&req
->rq_history_list
);
816 /* Track the highest culled req seq */
817 if (req
->rq_history_seq
> svcpt
->scp_hist_seq_culled
)
818 svcpt
->scp_hist_seq_culled
= req
->rq_history_seq
;
820 spin_unlock(&svcpt
->scp_lock
);
822 ptlrpc_server_free_request(req
);
824 spin_unlock(&svcpt
->scp_lock
);
829 * to finish a request: stop sending more early replies, and release
832 static void ptlrpc_server_finish_request(struct ptlrpc_service_part
*svcpt
,
833 struct ptlrpc_request
*req
)
835 ptlrpc_server_hpreq_fini(req
);
837 if (req
->rq_session
.lc_thread
) {
838 lu_context_exit(&req
->rq_session
);
839 lu_context_fini(&req
->rq_session
);
842 ptlrpc_server_drop_request(req
);
846 * to finish a active request: stop sending more early replies, and release
847 * the request. should be called after we finished handling the request.
849 static void ptlrpc_server_finish_active_request(
850 struct ptlrpc_service_part
*svcpt
,
851 struct ptlrpc_request
*req
)
853 spin_lock(&svcpt
->scp_req_lock
);
854 ptlrpc_nrs_req_stop_nolock(req
);
855 svcpt
->scp_nreqs_active
--;
857 svcpt
->scp_nhreqs_active
--;
858 spin_unlock(&svcpt
->scp_req_lock
);
860 ptlrpc_nrs_req_finalize(req
);
863 class_export_rpc_dec(req
->rq_export
);
865 ptlrpc_server_finish_request(svcpt
, req
);
869 * Sanity check request \a req.
870 * Return 0 if all is ok, error code otherwise.
872 static int ptlrpc_check_req(struct ptlrpc_request
*req
)
874 struct obd_device
*obd
= req
->rq_export
->exp_obd
;
877 if (unlikely(lustre_msg_get_conn_cnt(req
->rq_reqmsg
) <
878 req
->rq_export
->exp_conn_cnt
)) {
879 DEBUG_REQ(D_RPCTRACE
, req
,
880 "DROPPING req from old connection %d < %d",
881 lustre_msg_get_conn_cnt(req
->rq_reqmsg
),
882 req
->rq_export
->exp_conn_cnt
);
885 if (unlikely(!obd
|| obd
->obd_fail
)) {
887 * Failing over, don't handle any more reqs, send
888 * error response instead.
890 CDEBUG(D_RPCTRACE
, "Dropping req %p for failed obd %s\n",
891 req
, obd
? obd
->obd_name
: "unknown");
893 } else if (lustre_msg_get_flags(req
->rq_reqmsg
) &
894 (MSG_REPLAY
| MSG_REQ_REPLAY_DONE
)) {
895 DEBUG_REQ(D_ERROR
, req
, "Invalid replay without recovery");
896 class_fail_export(req
->rq_export
);
898 } else if (lustre_msg_get_transno(req
->rq_reqmsg
) != 0) {
899 DEBUG_REQ(D_ERROR
, req
,
900 "Invalid req with transno %llu without recovery",
901 lustre_msg_get_transno(req
->rq_reqmsg
));
902 class_fail_export(req
->rq_export
);
906 if (unlikely(rc
< 0)) {
913 static void ptlrpc_at_set_timer(struct ptlrpc_service_part
*svcpt
)
915 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
918 if (array
->paa_count
== 0) {
919 del_timer(&svcpt
->scp_at_timer
);
923 /* Set timer for closest deadline */
924 next
= (__s32
)(array
->paa_deadline
- ktime_get_real_seconds() -
927 ptlrpc_at_timer((unsigned long)svcpt
);
929 mod_timer(&svcpt
->scp_at_timer
, cfs_time_shift(next
));
930 CDEBUG(D_INFO
, "armed %s at %+ds\n",
931 svcpt
->scp_service
->srv_name
, next
);
935 /* Add rpc to early reply check list */
936 static int ptlrpc_at_add_timed(struct ptlrpc_request
*req
)
938 struct ptlrpc_service_part
*svcpt
= req
->rq_rqbd
->rqbd_svcpt
;
939 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
940 struct ptlrpc_request
*rq
= NULL
;
946 if (req
->rq_no_reply
)
949 if ((lustre_msghdr_get_flags(req
->rq_reqmsg
) & MSGHDR_AT_SUPPORT
) == 0)
952 spin_lock(&svcpt
->scp_at_lock
);
953 LASSERT(list_empty(&req
->rq_timed_list
));
955 div_u64_rem(req
->rq_deadline
, array
->paa_size
, &index
);
956 if (array
->paa_reqs_count
[index
] > 0) {
957 /* latest rpcs will have the latest deadlines in the list,
958 * so search backward.
960 list_for_each_entry_reverse(rq
, &array
->paa_reqs_array
[index
],
962 if (req
->rq_deadline
>= rq
->rq_deadline
) {
963 list_add(&req
->rq_timed_list
,
970 /* Add the request at the head of the list */
971 if (list_empty(&req
->rq_timed_list
))
972 list_add(&req
->rq_timed_list
, &array
->paa_reqs_array
[index
]);
974 spin_lock(&req
->rq_lock
);
975 req
->rq_at_linked
= 1;
976 spin_unlock(&req
->rq_lock
);
977 req
->rq_at_index
= index
;
978 array
->paa_reqs_count
[index
]++;
980 if (array
->paa_count
== 1 || array
->paa_deadline
> req
->rq_deadline
) {
981 array
->paa_deadline
= req
->rq_deadline
;
982 ptlrpc_at_set_timer(svcpt
);
984 spin_unlock(&svcpt
->scp_at_lock
);
990 ptlrpc_at_remove_timed(struct ptlrpc_request
*req
)
992 struct ptlrpc_at_array
*array
;
994 array
= &req
->rq_rqbd
->rqbd_svcpt
->scp_at_array
;
996 /* NB: must call with hold svcpt::scp_at_lock */
997 LASSERT(!list_empty(&req
->rq_timed_list
));
998 list_del_init(&req
->rq_timed_list
);
1000 spin_lock(&req
->rq_lock
);
1001 req
->rq_at_linked
= 0;
1002 spin_unlock(&req
->rq_lock
);
1004 array
->paa_reqs_count
[req
->rq_at_index
]--;
1009 * Attempt to extend the request deadline by sending an early reply to the
1012 static int ptlrpc_at_send_early_reply(struct ptlrpc_request
*req
)
1014 struct ptlrpc_service_part
*svcpt
= req
->rq_rqbd
->rqbd_svcpt
;
1015 struct ptlrpc_request
*reqcopy
;
1016 struct lustre_msg
*reqmsg
;
1017 long olddl
= req
->rq_deadline
- ktime_get_real_seconds();
1021 /* deadline is when the client expects us to reply, margin is the
1022 * difference between clients' and servers' expectations
1024 DEBUG_REQ(D_ADAPTTO
, req
,
1025 "%ssending early reply (deadline %+lds, margin %+lds) for %d+%d",
1026 AT_OFF
? "AT off - not " : "",
1027 olddl
, olddl
- at_get(&svcpt
->scp_at_estimate
),
1028 at_get(&svcpt
->scp_at_estimate
), at_extra
);
1034 DEBUG_REQ(D_WARNING
, req
, "Already past deadline (%+lds), not sending early reply. Consider increasing at_early_margin (%d)?",
1035 olddl
, at_early_margin
);
1037 /* Return an error so we're not re-added to the timed list. */
1041 if (!(lustre_msghdr_get_flags(req
->rq_reqmsg
) & MSGHDR_AT_SUPPORT
)) {
1042 DEBUG_REQ(D_INFO
, req
, "Wanted to ask client for more time, but no AT support");
1047 * We want to extend the request deadline by at_extra seconds,
1048 * so we set our service estimate to reflect how much time has
1049 * passed since this request arrived plus an additional
1050 * at_extra seconds. The client will calculate the new deadline
1051 * based on this service estimate (plus some additional time to
1052 * account for network latency). See ptlrpc_at_recv_early_reply
1054 at_measured(&svcpt
->scp_at_estimate
, at_extra
+
1055 ktime_get_real_seconds() - req
->rq_arrival_time
.tv_sec
);
1056 newdl
= req
->rq_arrival_time
.tv_sec
+ at_get(&svcpt
->scp_at_estimate
);
1058 /* Check to see if we've actually increased the deadline -
1059 * we may be past adaptive_max
1061 if (req
->rq_deadline
>= newdl
) {
1062 DEBUG_REQ(D_WARNING
, req
, "Couldn't add any time (%ld/%lld), not sending early reply\n",
1063 olddl
, newdl
- ktime_get_real_seconds());
1067 reqcopy
= ptlrpc_request_cache_alloc(GFP_NOFS
);
1070 reqmsg
= libcfs_kvzalloc(req
->rq_reqlen
, GFP_NOFS
);
1077 reqcopy
->rq_reply_state
= NULL
;
1078 reqcopy
->rq_rep_swab_mask
= 0;
1079 reqcopy
->rq_pack_bulk
= 0;
1080 reqcopy
->rq_pack_udesc
= 0;
1081 reqcopy
->rq_packed_final
= 0;
1082 sptlrpc_svc_ctx_addref(reqcopy
);
1083 /* We only need the reqmsg for the magic */
1084 reqcopy
->rq_reqmsg
= reqmsg
;
1085 memcpy(reqmsg
, req
->rq_reqmsg
, req
->rq_reqlen
);
1087 LASSERT(atomic_read(&req
->rq_refcount
));
1088 /** if it is last refcount then early reply isn't needed */
1089 if (atomic_read(&req
->rq_refcount
) == 1) {
1090 DEBUG_REQ(D_ADAPTTO
, reqcopy
, "Normal reply already sent out, abort sending early reply\n");
1095 /* Connection ref */
1096 reqcopy
->rq_export
= class_conn2export(
1097 lustre_msg_get_handle(reqcopy
->rq_reqmsg
));
1098 if (!reqcopy
->rq_export
) {
1104 class_export_rpc_inc(reqcopy
->rq_export
);
1105 if (reqcopy
->rq_export
->exp_obd
&&
1106 reqcopy
->rq_export
->exp_obd
->obd_fail
) {
1111 rc
= lustre_pack_reply_flags(reqcopy
, 1, NULL
, NULL
, LPRFL_EARLY_REPLY
);
1115 rc
= ptlrpc_send_reply(reqcopy
, PTLRPC_REPLY_EARLY
);
1118 /* Adjust our own deadline to what we told the client */
1119 req
->rq_deadline
= newdl
;
1120 req
->rq_early_count
++; /* number sent, server side */
1122 DEBUG_REQ(D_ERROR
, req
, "Early reply send failed %d", rc
);
1125 /* Free the (early) reply state from lustre_pack_reply.
1126 * (ptlrpc_send_reply takes it's own rs ref, so this is safe here)
1128 ptlrpc_req_drop_rs(reqcopy
);
1131 class_export_rpc_dec(reqcopy
->rq_export
);
1132 class_export_put(reqcopy
->rq_export
);
1134 sptlrpc_svc_ctx_decref(reqcopy
);
1137 ptlrpc_request_cache_free(reqcopy
);
1141 /* Send early replies to everybody expiring within at_early_margin
1142 * asking for at_extra time
1144 static void ptlrpc_at_check_timed(struct ptlrpc_service_part
*svcpt
)
1146 struct ptlrpc_at_array
*array
= &svcpt
->scp_at_array
;
1147 struct ptlrpc_request
*rq
, *n
;
1148 struct list_head work_list
;
1151 time64_t now
= ktime_get_real_seconds();
1153 int first
, counter
= 0;
1155 spin_lock(&svcpt
->scp_at_lock
);
1156 if (svcpt
->scp_at_check
== 0) {
1157 spin_unlock(&svcpt
->scp_at_lock
);
1160 delay
= cfs_time_sub(cfs_time_current(), svcpt
->scp_at_checktime
);
1161 svcpt
->scp_at_check
= 0;
1163 if (array
->paa_count
== 0) {
1164 spin_unlock(&svcpt
->scp_at_lock
);
1168 /* The timer went off, but maybe the nearest rpc already completed. */
1169 first
= array
->paa_deadline
- now
;
1170 if (first
> at_early_margin
) {
1171 /* We've still got plenty of time. Reset the timer. */
1172 ptlrpc_at_set_timer(svcpt
);
1173 spin_unlock(&svcpt
->scp_at_lock
);
1177 /* We're close to a timeout, and we don't know how much longer the
1178 * server will take. Send early replies to everyone expiring soon.
1180 INIT_LIST_HEAD(&work_list
);
1182 div_u64_rem(array
->paa_deadline
, array
->paa_size
, &index
);
1183 count
= array
->paa_count
;
1185 count
-= array
->paa_reqs_count
[index
];
1186 list_for_each_entry_safe(rq
, n
, &array
->paa_reqs_array
[index
],
1188 if (rq
->rq_deadline
> now
+ at_early_margin
) {
1189 /* update the earliest deadline */
1190 if (deadline
== -1 ||
1191 rq
->rq_deadline
< deadline
)
1192 deadline
= rq
->rq_deadline
;
1196 ptlrpc_at_remove_timed(rq
);
1198 * ptlrpc_server_drop_request() may drop
1199 * refcount to 0 already. Let's check this and
1200 * don't add entry to work_list
1202 if (likely(atomic_inc_not_zero(&rq
->rq_refcount
)))
1203 list_add(&rq
->rq_timed_list
, &work_list
);
1207 if (++index
>= array
->paa_size
)
1210 array
->paa_deadline
= deadline
;
1211 /* we have a new earliest deadline, restart the timer */
1212 ptlrpc_at_set_timer(svcpt
);
1214 spin_unlock(&svcpt
->scp_at_lock
);
1216 CDEBUG(D_ADAPTTO
, "timeout in %+ds, asking for %d secs on %d early replies\n",
1217 first
, at_extra
, counter
);
1219 /* We're already past request deadlines before we even get a
1220 * chance to send early replies
1222 LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
1223 svcpt
->scp_service
->srv_name
);
1224 CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%ld(jiff)\n",
1225 counter
, svcpt
->scp_nreqs_incoming
,
1226 svcpt
->scp_nreqs_active
,
1227 at_get(&svcpt
->scp_at_estimate
), delay
);
1230 /* we took additional refcount so entries can't be deleted from list, no
1233 while (!list_empty(&work_list
)) {
1234 rq
= list_entry(work_list
.next
, struct ptlrpc_request
,
1236 list_del_init(&rq
->rq_timed_list
);
1238 if (ptlrpc_at_send_early_reply(rq
) == 0)
1239 ptlrpc_at_add_timed(rq
);
1241 ptlrpc_server_drop_request(rq
);
1246 * Put the request to the export list if the request may become
1247 * a high priority one.
1249 static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part
*svcpt
,
1250 struct ptlrpc_request
*req
)
1254 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
) {
1255 rc
= svcpt
->scp_service
->srv_ops
.so_hpreq_handler(req
);
1260 if (req
->rq_export
&& req
->rq_ops
) {
1261 /* Perform request specific check. We should do this check
1262 * before the request is added into exp_hp_rpcs list otherwise
1263 * it may hit swab race at LU-1044.
1265 if (req
->rq_ops
->hpreq_check
) {
1266 rc
= req
->rq_ops
->hpreq_check(req
);
1267 if (rc
== -ESTALE
) {
1268 req
->rq_status
= rc
;
1271 /** can only return error,
1272 * 0 for normal request,
1273 * or 1 for high priority request
1278 spin_lock_bh(&req
->rq_export
->exp_rpc_lock
);
1279 list_add(&req
->rq_exp_list
, &req
->rq_export
->exp_hp_rpcs
);
1280 spin_unlock_bh(&req
->rq_export
->exp_rpc_lock
);
1283 ptlrpc_nrs_req_initialize(svcpt
, req
, rc
);
1288 /** Remove the request from the export list. */
1289 static void ptlrpc_server_hpreq_fini(struct ptlrpc_request
*req
)
1291 if (req
->rq_export
&& req
->rq_ops
) {
1292 /* refresh lock timeout again so that client has more
1293 * room to send lock cancel RPC.
1295 if (req
->rq_ops
->hpreq_fini
)
1296 req
->rq_ops
->hpreq_fini(req
);
1298 spin_lock_bh(&req
->rq_export
->exp_rpc_lock
);
1299 list_del_init(&req
->rq_exp_list
);
1300 spin_unlock_bh(&req
->rq_export
->exp_rpc_lock
);
1304 static int ptlrpc_server_request_add(struct ptlrpc_service_part
*svcpt
,
1305 struct ptlrpc_request
*req
)
1309 rc
= ptlrpc_server_hpreq_init(svcpt
, req
);
1313 ptlrpc_nrs_req_add(svcpt
, req
, !!rc
);
1319 * Allow to handle high priority request
1320 * User can call it w/o any lock but need to hold
1321 * ptlrpc_service_part::scp_req_lock to get reliable result
1323 static bool ptlrpc_server_allow_high(struct ptlrpc_service_part
*svcpt
,
1326 int running
= svcpt
->scp_nthrs_running
;
1328 if (!nrs_svcpt_has_hp(svcpt
))
1334 if (unlikely(svcpt
->scp_service
->srv_req_portal
== MDS_REQUEST_PORTAL
&&
1335 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND
))) {
1336 /* leave just 1 thread for normal RPCs */
1337 running
= PTLRPC_NTHRS_INIT
;
1338 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
)
1342 if (svcpt
->scp_nreqs_active
>= running
- 1)
1345 if (svcpt
->scp_nhreqs_active
== 0)
1348 return !ptlrpc_nrs_req_pending_nolock(svcpt
, false) ||
1349 svcpt
->scp_hreq_count
< svcpt
->scp_service
->srv_hpreq_ratio
;
1352 static bool ptlrpc_server_high_pending(struct ptlrpc_service_part
*svcpt
,
1355 return ptlrpc_server_allow_high(svcpt
, force
) &&
1356 ptlrpc_nrs_req_pending_nolock(svcpt
, true);
1360 * Only allow normal priority requests on a service that has a high-priority
1361 * queue if forced (i.e. cleanup), if there are other high priority requests
1362 * already being processed (i.e. those threads can service more high-priority
1363 * requests), or if there are enough idle threads that a later thread can do
1364 * a high priority request.
1365 * User can call it w/o any lock but need to hold
1366 * ptlrpc_service_part::scp_req_lock to get reliable result
1368 static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part
*svcpt
,
1371 int running
= svcpt
->scp_nthrs_running
;
1373 if (unlikely(svcpt
->scp_service
->srv_req_portal
== MDS_REQUEST_PORTAL
&&
1374 CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND
))) {
1375 /* leave just 1 thread for normal RPCs */
1376 running
= PTLRPC_NTHRS_INIT
;
1377 if (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
)
1382 svcpt
->scp_nreqs_active
< running
- 2)
1385 if (svcpt
->scp_nreqs_active
>= running
- 1)
1388 return svcpt
->scp_nhreqs_active
> 0 || !nrs_svcpt_has_hp(svcpt
);
1391 static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part
*svcpt
,
1394 return ptlrpc_server_allow_normal(svcpt
, force
) &&
1395 ptlrpc_nrs_req_pending_nolock(svcpt
, false);
1399 * Returns true if there are requests available in incoming
1400 * request queue for processing and it is allowed to fetch them.
1401 * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock
1402 * to get reliable result
1403 * \see ptlrpc_server_allow_normal
1404 * \see ptlrpc_server_allow high
1407 ptlrpc_server_request_pending(struct ptlrpc_service_part
*svcpt
, bool force
)
1409 return ptlrpc_server_high_pending(svcpt
, force
) ||
1410 ptlrpc_server_normal_pending(svcpt
, force
);
1414 * Fetch a request for processing from queue of unprocessed requests.
1415 * Favors high-priority requests.
1416 * Returns a pointer to fetched request.
1418 static struct ptlrpc_request
*
1419 ptlrpc_server_request_get(struct ptlrpc_service_part
*svcpt
, bool force
)
1421 struct ptlrpc_request
*req
= NULL
;
1423 spin_lock(&svcpt
->scp_req_lock
);
1425 if (ptlrpc_server_high_pending(svcpt
, force
)) {
1426 req
= ptlrpc_nrs_req_get_nolock(svcpt
, true, force
);
1428 svcpt
->scp_hreq_count
++;
1433 if (ptlrpc_server_normal_pending(svcpt
, force
)) {
1434 req
= ptlrpc_nrs_req_get_nolock(svcpt
, false, force
);
1436 svcpt
->scp_hreq_count
= 0;
1441 spin_unlock(&svcpt
->scp_req_lock
);
1445 svcpt
->scp_nreqs_active
++;
1447 svcpt
->scp_nhreqs_active
++;
1449 spin_unlock(&svcpt
->scp_req_lock
);
1451 if (likely(req
->rq_export
))
1452 class_export_rpc_inc(req
->rq_export
);
1458 * Handle freshly incoming reqs, add to timed early reply list,
1459 * pass on to regular request queue.
1460 * All incoming requests pass through here before getting into
1461 * ptlrpc_server_handle_req later on.
1464 ptlrpc_server_handle_req_in(struct ptlrpc_service_part
*svcpt
,
1465 struct ptlrpc_thread
*thread
)
1467 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
1468 struct ptlrpc_request
*req
;
1472 spin_lock(&svcpt
->scp_lock
);
1473 if (list_empty(&svcpt
->scp_req_incoming
)) {
1474 spin_unlock(&svcpt
->scp_lock
);
1478 req
= list_entry(svcpt
->scp_req_incoming
.next
,
1479 struct ptlrpc_request
, rq_list
);
1480 list_del_init(&req
->rq_list
);
1481 svcpt
->scp_nreqs_incoming
--;
1482 /* Consider this still a "queued" request as far as stats are
1485 spin_unlock(&svcpt
->scp_lock
);
1487 /* go through security check/transform */
1488 rc
= sptlrpc_svc_unwrap_request(req
);
1492 case SECSVC_COMPLETE
:
1493 target_send_reply(req
, 0, OBD_FAIL_MDS_ALL_REPLY_NET
);
1502 * for null-flavored rpc, msg has been unpacked by sptlrpc, although
1503 * redo it wouldn't be harmful.
1505 if (SPTLRPC_FLVR_POLICY(req
->rq_flvr
.sf_rpc
) != SPTLRPC_POLICY_NULL
) {
1506 rc
= ptlrpc_unpack_req_msg(req
, req
->rq_reqlen
);
1508 CERROR("error unpacking request: ptl %d from %s x%llu\n",
1509 svc
->srv_req_portal
, libcfs_id2str(req
->rq_peer
),
1515 rc
= lustre_unpack_req_ptlrpc_body(req
, MSG_PTLRPC_BODY_OFF
);
1517 CERROR("error unpacking ptlrpc body: ptl %d from %s x%llu\n",
1518 svc
->srv_req_portal
, libcfs_id2str(req
->rq_peer
),
1523 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC
) &&
1524 lustre_msg_get_opc(req
->rq_reqmsg
) == cfs_fail_val
) {
1525 CERROR("drop incoming rpc opc %u, x%llu\n",
1526 cfs_fail_val
, req
->rq_xid
);
1531 if (lustre_msg_get_type(req
->rq_reqmsg
) != PTL_RPC_MSG_REQUEST
) {
1532 CERROR("wrong packet type received (type=%u) from %s\n",
1533 lustre_msg_get_type(req
->rq_reqmsg
),
1534 libcfs_id2str(req
->rq_peer
));
1538 switch (lustre_msg_get_opc(req
->rq_reqmsg
)) {
1541 req
->rq_bulk_write
= 1;
1545 case MGS_CONFIG_READ
:
1546 req
->rq_bulk_read
= 1;
1550 CDEBUG(D_RPCTRACE
, "got req x%llu\n", req
->rq_xid
);
1552 req
->rq_export
= class_conn2export(
1553 lustre_msg_get_handle(req
->rq_reqmsg
));
1554 if (req
->rq_export
) {
1555 rc
= ptlrpc_check_req(req
);
1557 rc
= sptlrpc_target_export_check(req
->rq_export
, req
);
1559 DEBUG_REQ(D_ERROR
, req
, "DROPPING req with illegal security flavor,");
1566 /* req_in handling should/must be fast */
1567 if (ktime_get_real_seconds() - req
->rq_arrival_time
.tv_sec
> 5)
1568 DEBUG_REQ(D_WARNING
, req
, "Slow req_in handling " CFS_DURATION_T
"s",
1569 (long)(ktime_get_real_seconds() -
1570 req
->rq_arrival_time
.tv_sec
));
1572 /* Set rpc server deadline and add it to the timed list */
1573 deadline
= (lustre_msghdr_get_flags(req
->rq_reqmsg
) &
1574 MSGHDR_AT_SUPPORT
) ?
1575 /* The max time the client expects us to take */
1576 lustre_msg_get_timeout(req
->rq_reqmsg
) : obd_timeout
;
1577 req
->rq_deadline
= req
->rq_arrival_time
.tv_sec
+ deadline
;
1578 if (unlikely(deadline
== 0)) {
1579 DEBUG_REQ(D_ERROR
, req
, "Dropping request with 0 timeout");
1583 req
->rq_svc_thread
= thread
;
1585 /* initialize request session, it is needed for request
1586 * processing by target
1588 rc
= lu_context_init(&req
->rq_session
,
1589 LCT_SERVER_SESSION
| LCT_NOREF
);
1591 CERROR("%s: failure to initialize session: rc = %d\n",
1592 thread
->t_name
, rc
);
1595 req
->rq_session
.lc_thread
= thread
;
1596 lu_context_enter(&req
->rq_session
);
1597 req
->rq_svc_thread
->t_env
->le_ses
= &req
->rq_session
;
1600 ptlrpc_at_add_timed(req
);
1602 /* Move it over to the request processing queue */
1603 rc
= ptlrpc_server_request_add(svcpt
, req
);
1607 wake_up(&svcpt
->scp_waitq
);
1611 ptlrpc_server_finish_request(svcpt
, req
);
1617 * Main incoming request handling logic.
1618 * Calls handler function from service to do actual processing.
1621 ptlrpc_server_handle_request(struct ptlrpc_service_part
*svcpt
,
1622 struct ptlrpc_thread
*thread
)
1624 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
1625 struct ptlrpc_request
*request
;
1626 struct timespec64 work_start
;
1627 struct timespec64 work_end
;
1628 struct timespec64 timediff
;
1629 struct timespec64 arrived
;
1630 unsigned long timediff_usecs
;
1631 unsigned long arrived_usecs
;
1634 request
= ptlrpc_server_request_get(svcpt
, false);
1638 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT
))
1639 fail_opc
= OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT
;
1640 else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT
))
1641 fail_opc
= OBD_FAIL_PTLRPC_HPREQ_TIMEOUT
;
1643 if (unlikely(fail_opc
)) {
1644 if (request
->rq_export
&& request
->rq_ops
)
1645 OBD_FAIL_TIMEOUT(fail_opc
, 4);
1648 ptlrpc_rqphase_move(request
, RQ_PHASE_INTERPRET
);
1650 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG
))
1651 libcfs_debug_dumplog();
1653 ktime_get_real_ts64(&work_start
);
1654 timediff
= timespec64_sub(work_start
, request
->rq_arrival_time
);
1655 timediff_usecs
= timediff
.tv_sec
* USEC_PER_SEC
+
1656 timediff
.tv_nsec
/ NSEC_PER_USEC
;
1657 if (likely(svc
->srv_stats
)) {
1658 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQWAIT_CNTR
,
1660 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQQDEPTH_CNTR
,
1661 svcpt
->scp_nreqs_incoming
);
1662 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_REQACTIVE_CNTR
,
1663 svcpt
->scp_nreqs_active
);
1664 lprocfs_counter_add(svc
->srv_stats
, PTLRPC_TIMEOUT
,
1665 at_get(&svcpt
->scp_at_estimate
));
1668 if (likely(request
->rq_export
)) {
1669 if (unlikely(ptlrpc_check_req(request
)))
1673 /* Discard requests queued for longer than the deadline.
1674 * The deadline is increased if we send an early reply.
1676 if (ktime_get_real_seconds() > request
->rq_deadline
) {
1677 DEBUG_REQ(D_ERROR
, request
, "Dropping timed-out request from %s: deadline " CFS_DURATION_T
":" CFS_DURATION_T
"s ago\n",
1678 libcfs_id2str(request
->rq_peer
),
1679 (long)(request
->rq_deadline
-
1680 request
->rq_arrival_time
.tv_sec
),
1681 (long)(ktime_get_real_seconds() -
1682 request
->rq_deadline
));
1686 CDEBUG(D_RPCTRACE
, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d\n",
1688 (request
->rq_export
?
1689 (char *)request
->rq_export
->exp_client_uuid
.uuid
: "0"),
1690 (request
->rq_export
?
1691 atomic_read(&request
->rq_export
->exp_refcount
) : -99),
1692 lustre_msg_get_status(request
->rq_reqmsg
), request
->rq_xid
,
1693 libcfs_id2str(request
->rq_peer
),
1694 lustre_msg_get_opc(request
->rq_reqmsg
));
1696 if (lustre_msg_get_opc(request
->rq_reqmsg
) != OBD_PING
)
1697 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ
, cfs_fail_val
);
1699 CDEBUG(D_NET
, "got req %llu\n", request
->rq_xid
);
1701 /* re-assign request and sesson thread to the current one */
1702 request
->rq_svc_thread
= thread
;
1704 LASSERT(request
->rq_session
.lc_thread
);
1705 request
->rq_session
.lc_thread
= thread
;
1706 request
->rq_session
.lc_cookie
= 0x55;
1707 thread
->t_env
->le_ses
= &request
->rq_session
;
1709 svc
->srv_ops
.so_req_handler(request
);
1711 ptlrpc_rqphase_move(request
, RQ_PHASE_COMPLETE
);
1714 if (unlikely(ktime_get_real_seconds() > request
->rq_deadline
)) {
1715 DEBUG_REQ(D_WARNING
, request
,
1716 "Request took longer than estimated (%lld:%llds); "
1717 "client may timeout.",
1718 (s64
)request
->rq_deadline
-
1719 request
->rq_arrival_time
.tv_sec
,
1720 (s64
)ktime_get_real_seconds() - request
->rq_deadline
);
1723 ktime_get_real_ts64(&work_end
);
1724 timediff
= timespec64_sub(work_end
, work_start
);
1725 timediff_usecs
= timediff
.tv_sec
* USEC_PER_SEC
+
1726 timediff
.tv_nsec
/ NSEC_PER_USEC
;
1727 arrived
= timespec64_sub(work_end
, request
->rq_arrival_time
);
1728 arrived_usecs
= arrived
.tv_sec
* USEC_PER_SEC
+
1729 arrived
.tv_nsec
/ NSEC_PER_USEC
;
1730 CDEBUG(D_RPCTRACE
, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d Request processed in %ldus (%ldus total) trans %llu rc %d/%d\n",
1732 (request
->rq_export
?
1733 (char *)request
->rq_export
->exp_client_uuid
.uuid
: "0"),
1734 (request
->rq_export
?
1735 atomic_read(&request
->rq_export
->exp_refcount
) : -99),
1736 lustre_msg_get_status(request
->rq_reqmsg
),
1738 libcfs_id2str(request
->rq_peer
),
1739 lustre_msg_get_opc(request
->rq_reqmsg
),
1742 (request
->rq_repmsg
?
1743 lustre_msg_get_transno(request
->rq_repmsg
) :
1744 request
->rq_transno
),
1746 (request
->rq_repmsg
?
1747 lustre_msg_get_status(request
->rq_repmsg
) : -999));
1748 if (likely(svc
->srv_stats
&& request
->rq_reqmsg
)) {
1749 __u32 op
= lustre_msg_get_opc(request
->rq_reqmsg
);
1750 int opc
= opcode_offset(op
);
1752 if (opc
> 0 && !(op
== LDLM_ENQUEUE
|| op
== MDS_REINT
)) {
1753 LASSERT(opc
< LUSTRE_MAX_OPCODES
);
1754 lprocfs_counter_add(svc
->srv_stats
,
1755 opc
+ EXTRA_MAX_OPCODES
,
1759 if (unlikely(request
->rq_early_count
)) {
1760 DEBUG_REQ(D_ADAPTTO
, request
,
1761 "sent %d early replies before finishing in %llds",
1762 request
->rq_early_count
,
1763 (s64
)work_end
.tv_sec
-
1764 request
->rq_arrival_time
.tv_sec
);
1767 ptlrpc_server_finish_active_request(svcpt
, request
);
1773 * An internal function to process a single reply state object.
1776 ptlrpc_handle_rs(struct ptlrpc_reply_state
*rs
)
1778 struct ptlrpc_service_part
*svcpt
= rs
->rs_svcpt
;
1779 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
1780 struct obd_export
*exp
;
1784 exp
= rs
->rs_export
;
1786 LASSERT(rs
->rs_difficult
);
1787 LASSERT(rs
->rs_scheduled
);
1788 LASSERT(list_empty(&rs
->rs_list
));
1790 spin_lock(&exp
->exp_lock
);
1791 /* Noop if removed already */
1792 list_del_init(&rs
->rs_exp_list
);
1793 spin_unlock(&exp
->exp_lock
);
1795 /* The disk commit callback holds exp_uncommitted_replies_lock while it
1796 * iterates over newly committed replies, removing them from
1797 * exp_uncommitted_replies. It then drops this lock and schedules the
1798 * replies it found for handling here.
1800 * We can avoid contention for exp_uncommitted_replies_lock between the
1801 * HRT threads and further commit callbacks by checking rs_committed
1802 * which is set in the commit callback while it holds both
1803 * rs_lock and exp_uncommitted_reples.
1805 * If we see rs_committed clear, the commit callback _may_ not have
1806 * handled this reply yet and we race with it to grab
1807 * exp_uncommitted_replies_lock before removing the reply from
1808 * exp_uncommitted_replies. Note that if we lose the race and the
1809 * reply has already been removed, list_del_init() is a noop.
1811 * If we see rs_committed set, we know the commit callback is handling,
1812 * or has handled this reply since store reordering might allow us to
1813 * see rs_committed set out of sequence. But since this is done
1814 * holding rs_lock, we can be sure it has all completed once we hold
1815 * rs_lock, which we do right next.
1817 if (!rs
->rs_committed
) {
1818 spin_lock(&exp
->exp_uncommitted_replies_lock
);
1819 list_del_init(&rs
->rs_obd_list
);
1820 spin_unlock(&exp
->exp_uncommitted_replies_lock
);
1823 spin_lock(&rs
->rs_lock
);
1825 been_handled
= rs
->rs_handled
;
1828 nlocks
= rs
->rs_nlocks
; /* atomic "steal", but */
1829 rs
->rs_nlocks
= 0; /* locks still on rs_locks! */
1831 if (nlocks
== 0 && !been_handled
) {
1832 /* If we see this, we should already have seen the warning
1833 * in mds_steal_ack_locks()
1835 CDEBUG(D_HA
, "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n",
1837 rs
->rs_xid
, rs
->rs_transno
, rs
->rs_opc
,
1838 libcfs_nid2str(exp
->exp_connection
->c_peer
.nid
));
1841 if ((!been_handled
&& rs
->rs_on_net
) || nlocks
> 0) {
1842 spin_unlock(&rs
->rs_lock
);
1844 if (!been_handled
&& rs
->rs_on_net
) {
1845 LNetMDUnlink(rs
->rs_md_h
);
1846 /* Ignore return code; we're racing with completion */
1849 while (nlocks
-- > 0)
1850 ldlm_lock_decref(&rs
->rs_locks
[nlocks
],
1851 rs
->rs_modes
[nlocks
]);
1853 spin_lock(&rs
->rs_lock
);
1856 rs
->rs_scheduled
= 0;
1858 if (!rs
->rs_on_net
) {
1860 spin_unlock(&rs
->rs_lock
);
1862 class_export_put(exp
);
1863 rs
->rs_export
= NULL
;
1864 ptlrpc_rs_decref(rs
);
1865 if (atomic_dec_and_test(&svcpt
->scp_nreps_difficult
) &&
1866 svc
->srv_is_stopping
)
1867 wake_up_all(&svcpt
->scp_waitq
);
1871 /* still on the net; callback will schedule */
1872 spin_unlock(&rs
->rs_lock
);
1877 ptlrpc_check_rqbd_pool(struct ptlrpc_service_part
*svcpt
)
1879 int avail
= svcpt
->scp_nrqbds_posted
;
1880 int low_water
= test_req_buffer_pressure
? 0 :
1881 svcpt
->scp_service
->srv_nbuf_per_group
/ 2;
1883 /* NB I'm not locking; just looking. */
1885 /* CAVEAT EMPTOR: We might be allocating buffers here because we've
1886 * allowed the request history to grow out of control. We could put a
1887 * sanity check on that here and cull some history if we need the
1891 if (avail
<= low_water
)
1892 ptlrpc_grow_req_bufs(svcpt
, 1);
1894 if (svcpt
->scp_service
->srv_stats
) {
1895 lprocfs_counter_add(svcpt
->scp_service
->srv_stats
,
1896 PTLRPC_REQBUF_AVAIL_CNTR
, avail
);
1901 ptlrpc_retry_rqbds(void *arg
)
1903 struct ptlrpc_service_part
*svcpt
= arg
;
1905 svcpt
->scp_rqbd_timeout
= 0;
1910 ptlrpc_threads_enough(struct ptlrpc_service_part
*svcpt
)
1912 return svcpt
->scp_nreqs_active
<
1913 svcpt
->scp_nthrs_running
- 1 -
1914 (svcpt
->scp_service
->srv_ops
.so_hpreq_handler
!= NULL
);
1918 * allowed to create more threads
1919 * user can call it w/o any lock but need to hold
1920 * ptlrpc_service_part::scp_lock to get reliable result
1923 ptlrpc_threads_increasable(struct ptlrpc_service_part
*svcpt
)
1925 return svcpt
->scp_nthrs_running
+
1926 svcpt
->scp_nthrs_starting
<
1927 svcpt
->scp_service
->srv_nthrs_cpt_limit
;
1931 * too many requests and allowed to create more threads
1934 ptlrpc_threads_need_create(struct ptlrpc_service_part
*svcpt
)
1936 return !ptlrpc_threads_enough(svcpt
) &&
1937 ptlrpc_threads_increasable(svcpt
);
1941 ptlrpc_thread_stopping(struct ptlrpc_thread
*thread
)
1943 return thread_is_stopping(thread
) ||
1944 thread
->t_svcpt
->scp_service
->srv_is_stopping
;
1948 ptlrpc_rqbd_pending(struct ptlrpc_service_part
*svcpt
)
1950 return !list_empty(&svcpt
->scp_rqbd_idle
) &&
1951 svcpt
->scp_rqbd_timeout
== 0;
1955 ptlrpc_at_check(struct ptlrpc_service_part
*svcpt
)
1957 return svcpt
->scp_at_check
;
1961 * requests wait on preprocessing
1962 * user can call it w/o any lock but need to hold
1963 * ptlrpc_service_part::scp_lock to get reliable result
1966 ptlrpc_server_request_incoming(struct ptlrpc_service_part
*svcpt
)
1968 return !list_empty(&svcpt
->scp_req_incoming
);
1971 static __attribute__((__noinline__
)) int
1972 ptlrpc_wait_event(struct ptlrpc_service_part
*svcpt
,
1973 struct ptlrpc_thread
*thread
)
1975 /* Don't exit while there are replies to be handled */
1976 struct l_wait_info lwi
= LWI_TIMEOUT(svcpt
->scp_rqbd_timeout
,
1977 ptlrpc_retry_rqbds
, svcpt
);
1979 /* XXX: Add this back when libcfs watchdog is merged upstream
1980 lc_watchdog_disable(thread->t_watchdog);
1985 l_wait_event_exclusive_head(svcpt
->scp_waitq
,
1986 ptlrpc_thread_stopping(thread
) ||
1987 ptlrpc_server_request_incoming(svcpt
) ||
1988 ptlrpc_server_request_pending(svcpt
,
1990 ptlrpc_rqbd_pending(svcpt
) ||
1991 ptlrpc_at_check(svcpt
), &lwi
);
1993 if (ptlrpc_thread_stopping(thread
))
1997 lc_watchdog_touch(thread->t_watchdog,
1998 ptlrpc_server_get_timeout(svcpt));
2004 * Main thread body for service threads.
2005 * Waits in a loop waiting for new requests to process to appear.
2006 * Every time an incoming requests is added to its queue, a waitq
2007 * is woken up and one of the threads will handle it.
2009 static int ptlrpc_main(void *arg
)
2011 struct ptlrpc_thread
*thread
= arg
;
2012 struct ptlrpc_service_part
*svcpt
= thread
->t_svcpt
;
2013 struct ptlrpc_service
*svc
= svcpt
->scp_service
;
2014 struct ptlrpc_reply_state
*rs
;
2015 struct group_info
*ginfo
= NULL
;
2017 int counter
= 0, rc
= 0;
2019 thread
->t_pid
= current_pid();
2020 unshare_fs_struct();
2022 /* NB: we will call cfs_cpt_bind() for all threads, because we
2023 * might want to run lustre server only on a subset of system CPUs,
2024 * in that case ->scp_cpt is CFS_CPT_ANY
2026 rc
= cfs_cpt_bind(svc
->srv_cptable
, svcpt
->scp_cpt
);
2028 CWARN("%s: failed to bind %s on CPT %d\n",
2029 svc
->srv_name
, thread
->t_name
, svcpt
->scp_cpt
);
2032 ginfo
= groups_alloc(0);
2038 set_current_groups(ginfo
);
2039 put_group_info(ginfo
);
2041 if (svc
->srv_ops
.so_thr_init
) {
2042 rc
= svc
->srv_ops
.so_thr_init(thread
);
2047 env
= kzalloc(sizeof(*env
), GFP_NOFS
);
2053 rc
= lu_context_init(&env
->le_ctx
,
2054 svc
->srv_ctx_tags
| LCT_REMEMBER
| LCT_NOREF
);
2058 thread
->t_env
= env
;
2059 env
->le_ctx
.lc_thread
= thread
;
2060 env
->le_ctx
.lc_cookie
= 0x6;
2062 while (!list_empty(&svcpt
->scp_rqbd_idle
)) {
2063 rc
= ptlrpc_server_post_idle_rqbds(svcpt
);
2067 CERROR("Failed to post rqbd for %s on CPT %d: %d\n",
2068 svc
->srv_name
, svcpt
->scp_cpt
, rc
);
2072 /* Alloc reply state structure for this one */
2073 rs
= libcfs_kvzalloc(svc
->srv_max_reply_size
, GFP_NOFS
);
2079 spin_lock(&svcpt
->scp_lock
);
2081 LASSERT(thread_is_starting(thread
));
2082 thread_clear_flags(thread
, SVC_STARTING
);
2084 LASSERT(svcpt
->scp_nthrs_starting
== 1);
2085 svcpt
->scp_nthrs_starting
--;
2087 /* SVC_STOPPING may already be set here if someone else is trying
2088 * to stop the service while this new thread has been dynamically
2089 * forked. We still set SVC_RUNNING to let our creator know that
2090 * we are now running, however we will exit as soon as possible
2092 thread_add_flags(thread
, SVC_RUNNING
);
2093 svcpt
->scp_nthrs_running
++;
2094 spin_unlock(&svcpt
->scp_lock
);
2096 /* wake up our creator in case he's still waiting. */
2097 wake_up(&thread
->t_ctl_waitq
);
2100 thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt),
2104 spin_lock(&svcpt
->scp_rep_lock
);
2105 list_add(&rs
->rs_list
, &svcpt
->scp_rep_idle
);
2106 wake_up(&svcpt
->scp_rep_waitq
);
2107 spin_unlock(&svcpt
->scp_rep_lock
);
2109 CDEBUG(D_NET
, "service thread %d (#%d) started\n", thread
->t_id
,
2110 svcpt
->scp_nthrs_running
);
2112 /* XXX maintain a list of all managed devices: insert here */
2113 while (!ptlrpc_thread_stopping(thread
)) {
2114 if (ptlrpc_wait_event(svcpt
, thread
))
2117 ptlrpc_check_rqbd_pool(svcpt
);
2119 if (ptlrpc_threads_need_create(svcpt
)) {
2120 /* Ignore return code - we tried... */
2121 ptlrpc_start_thread(svcpt
, 0);
2124 /* Process all incoming reqs before handling any */
2125 if (ptlrpc_server_request_incoming(svcpt
)) {
2126 lu_context_enter(&env
->le_ctx
);
2128 ptlrpc_server_handle_req_in(svcpt
, thread
);
2129 lu_context_exit(&env
->le_ctx
);
2131 /* but limit ourselves in case of flood */
2132 if (counter
++ < 100)
2137 if (ptlrpc_at_check(svcpt
))
2138 ptlrpc_at_check_timed(svcpt
);
2140 if (ptlrpc_server_request_pending(svcpt
, false)) {
2141 lu_context_enter(&env
->le_ctx
);
2142 ptlrpc_server_handle_request(svcpt
, thread
);
2143 lu_context_exit(&env
->le_ctx
);
2146 if (ptlrpc_rqbd_pending(svcpt
) &&
2147 ptlrpc_server_post_idle_rqbds(svcpt
) < 0) {
2148 /* I just failed to repost request buffers.
2149 * Wait for a timeout (unless something else
2150 * happens) before I try again
2152 svcpt
->scp_rqbd_timeout
= cfs_time_seconds(1) / 10;
2153 CDEBUG(D_RPCTRACE
, "Posted buffers: %d\n",
2154 svcpt
->scp_nrqbds_posted
);
2159 lc_watchdog_delete(thread->t_watchdog);
2160 thread->t_watchdog = NULL;
2165 * deconstruct service specific state created by ptlrpc_start_thread()
2167 if (svc
->srv_ops
.so_thr_done
)
2168 svc
->srv_ops
.so_thr_done(thread
);
2171 lu_context_fini(&env
->le_ctx
);
2175 CDEBUG(D_RPCTRACE
, "service thread [ %p : %u ] %d exiting: rc %d\n",
2176 thread
, thread
->t_pid
, thread
->t_id
, rc
);
2178 spin_lock(&svcpt
->scp_lock
);
2179 if (thread_test_and_clear_flags(thread
, SVC_STARTING
))
2180 svcpt
->scp_nthrs_starting
--;
2182 if (thread_test_and_clear_flags(thread
, SVC_RUNNING
)) {
2183 /* must know immediately */
2184 svcpt
->scp_nthrs_running
--;
2188 thread_add_flags(thread
, SVC_STOPPED
);
2190 wake_up(&thread
->t_ctl_waitq
);
2191 spin_unlock(&svcpt
->scp_lock
);
2196 static int hrt_dont_sleep(struct ptlrpc_hr_thread
*hrt
,
2197 struct list_head
*replies
)
2201 spin_lock(&hrt
->hrt_lock
);
2203 list_splice_init(&hrt
->hrt_queue
, replies
);
2204 result
= ptlrpc_hr
.hr_stopping
|| !list_empty(replies
);
2206 spin_unlock(&hrt
->hrt_lock
);
2211 * Main body of "handle reply" function.
2212 * It processes acked reply states
2214 static int ptlrpc_hr_main(void *arg
)
2216 struct ptlrpc_hr_thread
*hrt
= arg
;
2217 struct ptlrpc_hr_partition
*hrp
= hrt
->hrt_partition
;
2219 char threadname
[20];
2222 snprintf(threadname
, sizeof(threadname
), "ptlrpc_hr%02d_%03d",
2223 hrp
->hrp_cpt
, hrt
->hrt_id
);
2224 unshare_fs_struct();
2226 rc
= cfs_cpt_bind(ptlrpc_hr
.hr_cpt_table
, hrp
->hrp_cpt
);
2228 CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n",
2229 threadname
, hrp
->hrp_cpt
, ptlrpc_hr
.hr_cpt_table
, rc
);
2232 atomic_inc(&hrp
->hrp_nstarted
);
2233 wake_up(&ptlrpc_hr
.hr_waitq
);
2235 while (!ptlrpc_hr
.hr_stopping
) {
2236 l_wait_condition(hrt
->hrt_waitq
, hrt_dont_sleep(hrt
, &replies
));
2238 while (!list_empty(&replies
)) {
2239 struct ptlrpc_reply_state
*rs
;
2241 rs
= list_entry(replies
.prev
, struct ptlrpc_reply_state
,
2243 list_del_init(&rs
->rs_list
);
2244 ptlrpc_handle_rs(rs
);
2248 atomic_inc(&hrp
->hrp_nstopped
);
2249 wake_up(&ptlrpc_hr
.hr_waitq
);
2254 static void ptlrpc_stop_hr_threads(void)
2256 struct ptlrpc_hr_partition
*hrp
;
2260 ptlrpc_hr
.hr_stopping
= 1;
2262 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2264 continue; /* uninitialized */
2265 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++)
2266 wake_up_all(&hrp
->hrp_thrs
[j
].hrt_waitq
);
2269 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2271 continue; /* uninitialized */
2272 wait_event(ptlrpc_hr
.hr_waitq
,
2273 atomic_read(&hrp
->hrp_nstopped
) ==
2274 atomic_read(&hrp
->hrp_nstarted
));
2278 static int ptlrpc_start_hr_threads(void)
2280 struct ptlrpc_hr_partition
*hrp
;
2284 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2287 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++) {
2288 struct ptlrpc_hr_thread
*hrt
= &hrp
->hrp_thrs
[j
];
2289 struct task_struct
*task
;
2291 task
= kthread_run(ptlrpc_hr_main
,
2293 "ptlrpc_hr%02d_%03d",
2294 hrp
->hrp_cpt
, hrt
->hrt_id
);
2300 wait_event(ptlrpc_hr
.hr_waitq
,
2301 atomic_read(&hrp
->hrp_nstarted
) == j
);
2304 CERROR("cannot start reply handler thread %d:%d: rc = %d\n",
2306 ptlrpc_stop_hr_threads();
2313 static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part
*svcpt
)
2315 struct l_wait_info lwi
= { 0 };
2316 struct ptlrpc_thread
*thread
;
2319 CDEBUG(D_INFO
, "Stopping threads for service %s\n",
2320 svcpt
->scp_service
->srv_name
);
2322 spin_lock(&svcpt
->scp_lock
);
2323 /* let the thread know that we would like it to stop asap */
2324 list_for_each_entry(thread
, &svcpt
->scp_threads
, t_link
) {
2325 CDEBUG(D_INFO
, "Stopping thread %s #%u\n",
2326 svcpt
->scp_service
->srv_thread_name
, thread
->t_id
);
2327 thread_add_flags(thread
, SVC_STOPPING
);
2330 wake_up_all(&svcpt
->scp_waitq
);
2332 while (!list_empty(&svcpt
->scp_threads
)) {
2333 thread
= list_entry(svcpt
->scp_threads
.next
,
2334 struct ptlrpc_thread
, t_link
);
2335 if (thread_is_stopped(thread
)) {
2336 list_del(&thread
->t_link
);
2337 list_add(&thread
->t_link
, &zombie
);
2340 spin_unlock(&svcpt
->scp_lock
);
2342 CDEBUG(D_INFO
, "waiting for stopping-thread %s #%u\n",
2343 svcpt
->scp_service
->srv_thread_name
, thread
->t_id
);
2344 l_wait_event(thread
->t_ctl_waitq
,
2345 thread_is_stopped(thread
), &lwi
);
2347 spin_lock(&svcpt
->scp_lock
);
2350 spin_unlock(&svcpt
->scp_lock
);
2352 while (!list_empty(&zombie
)) {
2353 thread
= list_entry(zombie
.next
,
2354 struct ptlrpc_thread
, t_link
);
2355 list_del(&thread
->t_link
);
2361 * Stops all threads of a particular service \a svc
2363 static void ptlrpc_stop_all_threads(struct ptlrpc_service
*svc
)
2365 struct ptlrpc_service_part
*svcpt
;
2368 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2369 if (svcpt
->scp_service
)
2370 ptlrpc_svcpt_stop_threads(svcpt
);
2374 int ptlrpc_start_threads(struct ptlrpc_service
*svc
)
2380 /* We require 2 threads min, see note in ptlrpc_server_handle_request */
2381 LASSERT(svc
->srv_nthrs_cpt_init
>= PTLRPC_NTHRS_INIT
);
2383 for (i
= 0; i
< svc
->srv_ncpts
; i
++) {
2384 for (j
= 0; j
< svc
->srv_nthrs_cpt_init
; j
++) {
2385 rc
= ptlrpc_start_thread(svc
->srv_parts
[i
], 1);
2391 /* We have enough threads, don't start more. b=15759 */
2398 CERROR("cannot start %s thread #%d_%d: rc %d\n",
2399 svc
->srv_thread_name
, i
, j
, rc
);
2400 ptlrpc_stop_all_threads(svc
);
2404 int ptlrpc_start_thread(struct ptlrpc_service_part
*svcpt
, int wait
)
2406 struct l_wait_info lwi
= { 0 };
2407 struct ptlrpc_thread
*thread
;
2408 struct ptlrpc_service
*svc
;
2409 struct task_struct
*task
;
2412 svc
= svcpt
->scp_service
;
2414 CDEBUG(D_RPCTRACE
, "%s[%d] started %d min %d max %d\n",
2415 svc
->srv_name
, svcpt
->scp_cpt
, svcpt
->scp_nthrs_running
,
2416 svc
->srv_nthrs_cpt_init
, svc
->srv_nthrs_cpt_limit
);
2419 if (unlikely(svc
->srv_is_stopping
))
2422 if (!ptlrpc_threads_increasable(svcpt
) ||
2423 (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS
) &&
2424 svcpt
->scp_nthrs_running
== svc
->srv_nthrs_cpt_init
- 1))
2427 thread
= kzalloc_node(sizeof(*thread
), GFP_NOFS
,
2428 cfs_cpt_spread_node(svc
->srv_cptable
,
2432 init_waitqueue_head(&thread
->t_ctl_waitq
);
2434 spin_lock(&svcpt
->scp_lock
);
2435 if (!ptlrpc_threads_increasable(svcpt
)) {
2436 spin_unlock(&svcpt
->scp_lock
);
2441 if (svcpt
->scp_nthrs_starting
!= 0) {
2442 /* serialize starting because some modules (obdfilter)
2443 * might require unique and contiguous t_id
2445 LASSERT(svcpt
->scp_nthrs_starting
== 1);
2446 spin_unlock(&svcpt
->scp_lock
);
2449 CDEBUG(D_INFO
, "Waiting for creating thread %s #%d\n",
2450 svc
->srv_thread_name
, svcpt
->scp_thr_nextid
);
2455 CDEBUG(D_INFO
, "Creating thread %s #%d race, retry later\n",
2456 svc
->srv_thread_name
, svcpt
->scp_thr_nextid
);
2460 svcpt
->scp_nthrs_starting
++;
2461 thread
->t_id
= svcpt
->scp_thr_nextid
++;
2462 thread_add_flags(thread
, SVC_STARTING
);
2463 thread
->t_svcpt
= svcpt
;
2465 list_add(&thread
->t_link
, &svcpt
->scp_threads
);
2466 spin_unlock(&svcpt
->scp_lock
);
2468 if (svcpt
->scp_cpt
>= 0) {
2469 snprintf(thread
->t_name
, sizeof(thread
->t_name
), "%s%02d_%03d",
2470 svc
->srv_thread_name
, svcpt
->scp_cpt
, thread
->t_id
);
2472 snprintf(thread
->t_name
, sizeof(thread
->t_name
), "%s_%04d",
2473 svc
->srv_thread_name
, thread
->t_id
);
2476 CDEBUG(D_RPCTRACE
, "starting thread '%s'\n", thread
->t_name
);
2477 task
= kthread_run(ptlrpc_main
, thread
, "%s", thread
->t_name
);
2480 CERROR("cannot start thread '%s': rc = %d\n",
2481 thread
->t_name
, rc
);
2482 spin_lock(&svcpt
->scp_lock
);
2483 --svcpt
->scp_nthrs_starting
;
2484 if (thread_is_stopping(thread
)) {
2485 /* this ptlrpc_thread is being handled
2486 * by ptlrpc_svcpt_stop_threads now
2488 thread_add_flags(thread
, SVC_STOPPED
);
2489 wake_up(&thread
->t_ctl_waitq
);
2490 spin_unlock(&svcpt
->scp_lock
);
2492 list_del(&thread
->t_link
);
2493 spin_unlock(&svcpt
->scp_lock
);
2502 l_wait_event(thread
->t_ctl_waitq
,
2503 thread_is_running(thread
) || thread_is_stopped(thread
),
2506 rc
= thread_is_stopped(thread
) ? thread
->t_id
: 0;
2510 int ptlrpc_hr_init(void)
2512 struct ptlrpc_hr_partition
*hrp
;
2513 struct ptlrpc_hr_thread
*hrt
;
2519 memset(&ptlrpc_hr
, 0, sizeof(ptlrpc_hr
));
2520 ptlrpc_hr
.hr_cpt_table
= cfs_cpt_table
;
2522 ptlrpc_hr
.hr_partitions
= cfs_percpt_alloc(ptlrpc_hr
.hr_cpt_table
,
2524 if (!ptlrpc_hr
.hr_partitions
)
2527 init_waitqueue_head(&ptlrpc_hr
.hr_waitq
);
2529 weight
= cpumask_weight(topology_sibling_cpumask(0));
2531 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2534 atomic_set(&hrp
->hrp_nstarted
, 0);
2535 atomic_set(&hrp
->hrp_nstopped
, 0);
2537 hrp
->hrp_nthrs
= cfs_cpt_weight(ptlrpc_hr
.hr_cpt_table
, i
);
2538 hrp
->hrp_nthrs
/= weight
;
2539 if (hrp
->hrp_nthrs
== 0)
2543 kzalloc_node(hrp
->hrp_nthrs
* sizeof(*hrt
), GFP_NOFS
,
2544 cfs_cpt_spread_node(ptlrpc_hr
.hr_cpt_table
,
2546 if (!hrp
->hrp_thrs
) {
2551 for (j
= 0; j
< hrp
->hrp_nthrs
; j
++) {
2552 hrt
= &hrp
->hrp_thrs
[j
];
2555 hrt
->hrt_partition
= hrp
;
2556 init_waitqueue_head(&hrt
->hrt_waitq
);
2557 spin_lock_init(&hrt
->hrt_lock
);
2558 INIT_LIST_HEAD(&hrt
->hrt_queue
);
2562 rc
= ptlrpc_start_hr_threads();
2569 void ptlrpc_hr_fini(void)
2571 struct ptlrpc_hr_partition
*hrp
;
2574 if (!ptlrpc_hr
.hr_partitions
)
2577 ptlrpc_stop_hr_threads();
2579 cfs_percpt_for_each(hrp
, i
, ptlrpc_hr
.hr_partitions
) {
2580 kfree(hrp
->hrp_thrs
);
2583 cfs_percpt_free(ptlrpc_hr
.hr_partitions
);
2584 ptlrpc_hr
.hr_partitions
= NULL
;
2588 * Wait until all already scheduled replies are processed.
2590 static void ptlrpc_wait_replies(struct ptlrpc_service_part
*svcpt
)
2594 struct l_wait_info lwi
= LWI_TIMEOUT(cfs_time_seconds(10),
2597 rc
= l_wait_event(svcpt
->scp_waitq
,
2598 atomic_read(&svcpt
->scp_nreps_difficult
) == 0,
2602 CWARN("Unexpectedly long timeout %s %p\n",
2603 svcpt
->scp_service
->srv_name
, svcpt
->scp_service
);
2608 ptlrpc_service_del_atimer(struct ptlrpc_service
*svc
)
2610 struct ptlrpc_service_part
*svcpt
;
2613 /* early disarm AT timer... */
2614 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2615 if (svcpt
->scp_service
)
2616 del_timer(&svcpt
->scp_at_timer
);
2621 ptlrpc_service_unlink_rqbd(struct ptlrpc_service
*svc
)
2623 struct ptlrpc_service_part
*svcpt
;
2624 struct ptlrpc_request_buffer_desc
*rqbd
;
2625 struct l_wait_info lwi
;
2629 /* All history will be culled when the next request buffer is
2630 * freed in ptlrpc_service_purge_all()
2632 svc
->srv_hist_nrqbds_cpt_max
= 0;
2634 rc
= LNetClearLazyPortal(svc
->srv_req_portal
);
2637 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2638 if (!svcpt
->scp_service
)
2641 /* Unlink all the request buffers. This forces a 'final'
2642 * event with its 'unlink' flag set for each posted rqbd
2644 list_for_each_entry(rqbd
, &svcpt
->scp_rqbd_posted
,
2646 rc
= LNetMDUnlink(rqbd
->rqbd_md_h
);
2647 LASSERT(rc
== 0 || rc
== -ENOENT
);
2651 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2652 if (!svcpt
->scp_service
)
2655 /* Wait for the network to release any buffers
2656 * it's currently filling
2658 spin_lock(&svcpt
->scp_lock
);
2659 while (svcpt
->scp_nrqbds_posted
!= 0) {
2660 spin_unlock(&svcpt
->scp_lock
);
2661 /* Network access will complete in finite time but
2662 * the HUGE timeout lets us CWARN for visibility
2665 lwi
= LWI_TIMEOUT_INTERVAL(
2666 cfs_time_seconds(LONG_UNLINK
),
2667 cfs_time_seconds(1), NULL
, NULL
);
2668 rc
= l_wait_event(svcpt
->scp_waitq
,
2669 svcpt
->scp_nrqbds_posted
== 0, &lwi
);
2670 if (rc
== -ETIMEDOUT
) {
2671 CWARN("Service %s waiting for request buffers\n",
2672 svcpt
->scp_service
->srv_name
);
2674 spin_lock(&svcpt
->scp_lock
);
2676 spin_unlock(&svcpt
->scp_lock
);
2681 ptlrpc_service_purge_all(struct ptlrpc_service
*svc
)
2683 struct ptlrpc_service_part
*svcpt
;
2684 struct ptlrpc_request_buffer_desc
*rqbd
;
2685 struct ptlrpc_request
*req
;
2686 struct ptlrpc_reply_state
*rs
;
2689 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2690 if (!svcpt
->scp_service
)
2693 spin_lock(&svcpt
->scp_rep_lock
);
2694 while (!list_empty(&svcpt
->scp_rep_active
)) {
2695 rs
= list_entry(svcpt
->scp_rep_active
.next
,
2696 struct ptlrpc_reply_state
, rs_list
);
2697 spin_lock(&rs
->rs_lock
);
2698 ptlrpc_schedule_difficult_reply(rs
);
2699 spin_unlock(&rs
->rs_lock
);
2701 spin_unlock(&svcpt
->scp_rep_lock
);
2703 /* purge the request queue. NB No new replies (rqbds
2704 * all unlinked) and no service threads, so I'm the only
2705 * thread noodling the request queue now
2707 while (!list_empty(&svcpt
->scp_req_incoming
)) {
2708 req
= list_entry(svcpt
->scp_req_incoming
.next
,
2709 struct ptlrpc_request
, rq_list
);
2711 list_del(&req
->rq_list
);
2712 svcpt
->scp_nreqs_incoming
--;
2713 ptlrpc_server_finish_request(svcpt
, req
);
2716 while (ptlrpc_server_request_pending(svcpt
, true)) {
2717 req
= ptlrpc_server_request_get(svcpt
, true);
2718 ptlrpc_server_finish_active_request(svcpt
, req
);
2721 LASSERT(list_empty(&svcpt
->scp_rqbd_posted
));
2722 LASSERT(svcpt
->scp_nreqs_incoming
== 0);
2723 LASSERT(svcpt
->scp_nreqs_active
== 0);
2724 /* history should have been culled by
2725 * ptlrpc_server_finish_request
2727 LASSERT(svcpt
->scp_hist_nrqbds
== 0);
2729 /* Now free all the request buffers since nothing
2730 * references them any more...
2733 while (!list_empty(&svcpt
->scp_rqbd_idle
)) {
2734 rqbd
= list_entry(svcpt
->scp_rqbd_idle
.next
,
2735 struct ptlrpc_request_buffer_desc
,
2737 ptlrpc_free_rqbd(rqbd
);
2739 ptlrpc_wait_replies(svcpt
);
2741 while (!list_empty(&svcpt
->scp_rep_idle
)) {
2742 rs
= list_entry(svcpt
->scp_rep_idle
.next
,
2743 struct ptlrpc_reply_state
,
2745 list_del(&rs
->rs_list
);
2752 ptlrpc_service_free(struct ptlrpc_service
*svc
)
2754 struct ptlrpc_service_part
*svcpt
;
2755 struct ptlrpc_at_array
*array
;
2758 ptlrpc_service_for_each_part(svcpt
, i
, svc
) {
2759 if (!svcpt
->scp_service
)
2762 /* In case somebody rearmed this in the meantime */
2763 del_timer(&svcpt
->scp_at_timer
);
2764 array
= &svcpt
->scp_at_array
;
2766 kfree(array
->paa_reqs_array
);
2767 array
->paa_reqs_array
= NULL
;
2768 kfree(array
->paa_reqs_count
);
2769 array
->paa_reqs_count
= NULL
;
2772 ptlrpc_service_for_each_part(svcpt
, i
, svc
)
2776 cfs_expr_list_values_free(svc
->srv_cpts
, svc
->srv_ncpts
);
2781 int ptlrpc_unregister_service(struct ptlrpc_service
*service
)
2783 CDEBUG(D_NET
, "%s: tearing down\n", service
->srv_name
);
2785 service
->srv_is_stopping
= 1;
2787 mutex_lock(&ptlrpc_all_services_mutex
);
2788 list_del_init(&service
->srv_list
);
2789 mutex_unlock(&ptlrpc_all_services_mutex
);
2791 ptlrpc_service_del_atimer(service
);
2792 ptlrpc_stop_all_threads(service
);
2794 ptlrpc_service_unlink_rqbd(service
);
2795 ptlrpc_service_purge_all(service
);
2796 ptlrpc_service_nrs_cleanup(service
);
2798 ptlrpc_lprocfs_unregister_service(service
);
2799 ptlrpc_sysfs_unregister_service(service
);
2801 ptlrpc_service_free(service
);
2805 EXPORT_SYMBOL(ptlrpc_unregister_service
);