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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ldlm/ldlm_pool.c
38 * Author: Yury Umanets <umka@clusterfs.com>
42 * Idea of this code is rather simple. Each second, for each server namespace
43 * we have SLV - server lock volume which is calculated on current number of
44 * granted locks, grant speed for past period, etc - that is, locking load.
45 * This SLV number may be thought as a flow definition for simplicity. It is
46 * sent to clients with each occasion to let them know what is current load
47 * situation on the server. By default, at the beginning, SLV on server is
48 * set max value which is calculated as the following: allow to one client
49 * have all locks of limit ->pl_limit for 10h.
51 * Next, on clients, number of cached locks is not limited artificially in any
52 * way as it was before. Instead, client calculates CLV, that is, client lock
53 * volume for each lock and compares it with last SLV from the server. CLV is
54 * calculated as the number of locks in LRU * lock live time in seconds. If
55 * CLV > SLV - lock is canceled.
57 * Client has LVF, that is, lock volume factor which regulates how much sensitive
58 * client should be about last SLV from server. The higher LVF is the more locks
59 * will be canceled on client. Default value for it is 1. Setting LVF to 2 means
60 * that client will cancel locks 2 times faster.
62 * Locks on a client will be canceled more intensively in these cases:
63 * (1) if SLV is smaller, that is, load is higher on the server;
64 * (2) client has a lot of locks (the more locks are held by client, the bigger
65 * chances that some of them should be canceled);
66 * (3) client has old locks (taken some time ago);
68 * Thus, according to flow paradigm that we use for better understanding SLV,
69 * CLV is the volume of particle in flow described by SLV. According to this,
70 * if flow is getting thinner, more and more particles become outside of it and
71 * as particles are locks, they should be canceled.
73 * General idea of this belongs to Vitaly Fertman (vitaly@clusterfs.com). Andreas
74 * Dilger (adilger@clusterfs.com) proposed few nice ideas like using LVF and many
75 * cleanups. Flow definition to allow more easy understanding of the logic belongs
76 * to Nikita Danilov (nikita@clusterfs.com) as well as many cleanups and fixes.
77 * And design and implementation are done by Yury Umanets (umka@clusterfs.com).
79 * Glossary for terms used:
81 * pl_limit - Number of allowed locks in pool. Applies to server and client
84 * pl_granted - Number of granted locks (calculated);
85 * pl_grant_rate - Number of granted locks for last T (calculated);
86 * pl_cancel_rate - Number of canceled locks for last T (calculated);
87 * pl_grant_speed - Grant speed (GR - CR) for last T (calculated);
88 * pl_grant_plan - Planned number of granted locks for next T (calculated);
89 * pl_server_lock_volume - Current server lock volume (calculated);
91 * As it may be seen from list above, we have few possible tunables which may
92 * affect behavior much. They all may be modified via proc. However, they also
93 * give a possibility for constructing few pre-defined behavior policies. If
94 * none of predefines is suitable for a working pattern being used, new one may
95 * be "constructed" via proc tunables.
98 #define DEBUG_SUBSYSTEM S_LDLM
100 #include <lustre_dlm.h>
101 #include <cl_object.h>
102 #include <obd_class.h>
103 #include <obd_support.h>
104 #include "ldlm_internal.h"
106 #ifdef HAVE_LRU_RESIZE_SUPPORT
109 * 50 ldlm locks for 1MB of RAM.
111 #define LDLM_POOL_HOST_L ((NUM_CACHEPAGES >> (20 - PAGE_CACHE_SHIFT)) * 50)
114 * Maximal possible grant step plan in %.
116 #define LDLM_POOL_MAX_GSP (30)
119 * Minimal possible grant step plan in %.
121 #define LDLM_POOL_MIN_GSP (1)
124 * This controls the speed of reaching LDLM_POOL_MAX_GSP
125 * with increasing thread period.
127 #define LDLM_POOL_GSP_STEP_SHIFT (2)
130 * LDLM_POOL_GSP% of all locks is default GP.
132 #define LDLM_POOL_GP(L) (((L) * LDLM_POOL_MAX_GSP) / 100)
135 * Max age for locks on clients.
137 #define LDLM_POOL_MAX_AGE (36000)
140 * The granularity of SLV calculation.
142 #define LDLM_POOL_SLV_SHIFT (10)
144 extern struct proc_dir_entry *ldlm_ns_proc_dir;
146 static inline __u64 dru(__u64 val, __u32 shift, int round_up)
148 return (val + (round_up ? (1 << shift) - 1 : 0)) >> shift;
151 static inline __u64 ldlm_pool_slv_max(__u32 L)
154 * Allow to have all locks for 1 client for 10 hrs.
155 * Formula is the following: limit * 10h / 1 client.
157 __u64 lim = (__u64)L * LDLM_POOL_MAX_AGE / 1;
161 static inline __u64 ldlm_pool_slv_min(__u32 L)
167 LDLM_POOL_FIRST_STAT = 0,
168 LDLM_POOL_GRANTED_STAT = LDLM_POOL_FIRST_STAT,
169 LDLM_POOL_GRANT_STAT,
170 LDLM_POOL_CANCEL_STAT,
171 LDLM_POOL_GRANT_RATE_STAT,
172 LDLM_POOL_CANCEL_RATE_STAT,
173 LDLM_POOL_GRANT_PLAN_STAT,
175 LDLM_POOL_SHRINK_REQTD_STAT,
176 LDLM_POOL_SHRINK_FREED_STAT,
177 LDLM_POOL_RECALC_STAT,
178 LDLM_POOL_TIMING_STAT,
182 static inline struct ldlm_namespace *ldlm_pl2ns(struct ldlm_pool *pl)
184 return container_of(pl, struct ldlm_namespace, ns_pool);
188 * Calculates suggested grant_step in % of available locks for passed
189 * \a period. This is later used in grant_plan calculations.
191 static inline int ldlm_pool_t2gsp(unsigned int t)
194 * This yields 1% grant step for anything below LDLM_POOL_GSP_STEP
195 * and up to 30% for anything higher than LDLM_POOL_GSP_STEP.
197 * How this will affect execution is the following:
199 * - for thread period 1s we will have grant_step 1% which good from
200 * pov of taking some load off from server and push it out to clients.
201 * This is like that because 1% for grant_step means that server will
202 * not allow clients to get lots of locks in short period of time and
203 * keep all old locks in their caches. Clients will always have to
204 * get some locks back if they want to take some new;
206 * - for thread period 10s (which is default) we will have 23% which
207 * means that clients will have enough of room to take some new locks
208 * without getting some back. All locks from this 23% which were not
209 * taken by clients in current period will contribute in SLV growing.
210 * SLV growing means more locks cached on clients until limit or grant
213 return LDLM_POOL_MAX_GSP -
214 ((LDLM_POOL_MAX_GSP - LDLM_POOL_MIN_GSP) >>
215 (t >> LDLM_POOL_GSP_STEP_SHIFT));
219 * Recalculates next grant limit on passed \a pl.
221 * \pre ->pl_lock is locked.
223 static void ldlm_pool_recalc_grant_plan(struct ldlm_pool *pl)
225 int granted, grant_step, limit;
227 limit = ldlm_pool_get_limit(pl);
228 granted = atomic_read(&pl->pl_granted);
230 grant_step = ldlm_pool_t2gsp(pl->pl_recalc_period);
231 grant_step = ((limit - granted) * grant_step) / 100;
232 pl->pl_grant_plan = granted + grant_step;
233 limit = (limit * 5) >> 2;
234 if (pl->pl_grant_plan > limit)
235 pl->pl_grant_plan = limit;
239 * Recalculates next SLV on passed \a pl.
241 * \pre ->pl_lock is locked.
243 static void ldlm_pool_recalc_slv(struct ldlm_pool *pl)
253 slv = pl->pl_server_lock_volume;
254 grant_plan = pl->pl_grant_plan;
255 limit = ldlm_pool_get_limit(pl);
256 granted = atomic_read(&pl->pl_granted);
257 round_up = granted < limit;
259 grant_usage = max_t(int, limit - (granted - grant_plan), 1);
262 * Find out SLV change factor which is the ratio of grant usage
263 * from limit. SLV changes as fast as the ratio of grant plan
264 * consumption. The more locks from grant plan are not consumed
265 * by clients in last interval (idle time), the faster grows
266 * SLV. And the opposite, the more grant plan is over-consumed
267 * (load time) the faster drops SLV.
269 slv_factor = (grant_usage << LDLM_POOL_SLV_SHIFT);
270 do_div(slv_factor, limit);
271 slv = slv * slv_factor;
272 slv = dru(slv, LDLM_POOL_SLV_SHIFT, round_up);
274 if (slv > ldlm_pool_slv_max(limit)) {
275 slv = ldlm_pool_slv_max(limit);
276 } else if (slv < ldlm_pool_slv_min(limit)) {
277 slv = ldlm_pool_slv_min(limit);
280 pl->pl_server_lock_volume = slv;
284 * Recalculates next stats on passed \a pl.
286 * \pre ->pl_lock is locked.
288 static void ldlm_pool_recalc_stats(struct ldlm_pool *pl)
290 int grant_plan = pl->pl_grant_plan;
291 __u64 slv = pl->pl_server_lock_volume;
292 int granted = atomic_read(&pl->pl_granted);
293 int grant_rate = atomic_read(&pl->pl_grant_rate);
294 int cancel_rate = atomic_read(&pl->pl_cancel_rate);
296 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_SLV_STAT,
298 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_GRANTED_STAT,
300 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_GRANT_RATE_STAT,
302 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_GRANT_PLAN_STAT,
304 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_CANCEL_RATE_STAT,
309 * Sets current SLV into obd accessible via ldlm_pl2ns(pl)->ns_obd.
311 static void ldlm_srv_pool_push_slv(struct ldlm_pool *pl)
313 struct obd_device *obd;
316 * Set new SLV in obd field for using it later without accessing the
317 * pool. This is required to avoid race between sending reply to client
318 * with new SLV and cleanup server stack in which we can't guarantee
319 * that namespace is still alive. We know only that obd is alive as
320 * long as valid export is alive.
322 obd = ldlm_pl2ns(pl)->ns_obd;
323 LASSERT(obd != NULL);
324 write_lock(&obd->obd_pool_lock);
325 obd->obd_pool_slv = pl->pl_server_lock_volume;
326 write_unlock(&obd->obd_pool_lock);
330 * Recalculates all pool fields on passed \a pl.
332 * \pre ->pl_lock is not locked.
334 static int ldlm_srv_pool_recalc(struct ldlm_pool *pl)
336 time_t recalc_interval_sec;
339 recalc_interval_sec = cfs_time_current_sec() - pl->pl_recalc_time;
340 if (recalc_interval_sec < pl->pl_recalc_period)
343 spin_lock(&pl->pl_lock);
344 recalc_interval_sec = cfs_time_current_sec() - pl->pl_recalc_time;
345 if (recalc_interval_sec < pl->pl_recalc_period) {
346 spin_unlock(&pl->pl_lock);
350 * Recalc SLV after last period. This should be done
351 * _before_ recalculating new grant plan.
353 ldlm_pool_recalc_slv(pl);
356 * Make sure that pool informed obd of last SLV changes.
358 ldlm_srv_pool_push_slv(pl);
361 * Update grant_plan for new period.
363 ldlm_pool_recalc_grant_plan(pl);
365 pl->pl_recalc_time = cfs_time_current_sec();
366 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_TIMING_STAT,
367 recalc_interval_sec);
368 spin_unlock(&pl->pl_lock);
373 * This function is used on server side as main entry point for memory
374 * pressure handling. It decreases SLV on \a pl according to passed
375 * \a nr and \a gfp_mask.
377 * Our goal here is to decrease SLV such a way that clients hold \a nr
378 * locks smaller in next 10h.
380 static int ldlm_srv_pool_shrink(struct ldlm_pool *pl,
381 int nr, gfp_t gfp_mask)
386 * VM is asking how many entries may be potentially freed.
389 return atomic_read(&pl->pl_granted);
392 * Client already canceled locks but server is already in shrinker
393 * and can't cancel anything. Let's catch this race.
395 if (atomic_read(&pl->pl_granted) == 0)
398 spin_lock(&pl->pl_lock);
401 * We want shrinker to possibly cause cancellation of @nr locks from
402 * clients or grant approximately @nr locks smaller next intervals.
404 * This is why we decreased SLV by @nr. This effect will only be as
405 * long as one re-calc interval (1s these days) and this should be
406 * enough to pass this decreased SLV to all clients. On next recalc
407 * interval pool will either increase SLV if locks load is not high
408 * or will keep on same level or even decrease again, thus, shrinker
409 * decreased SLV will affect next recalc intervals and this way will
410 * make locking load lower.
412 if (nr < pl->pl_server_lock_volume) {
413 pl->pl_server_lock_volume = pl->pl_server_lock_volume - nr;
415 limit = ldlm_pool_get_limit(pl);
416 pl->pl_server_lock_volume = ldlm_pool_slv_min(limit);
420 * Make sure that pool informed obd of last SLV changes.
422 ldlm_srv_pool_push_slv(pl);
423 spin_unlock(&pl->pl_lock);
426 * We did not really free any memory here so far, it only will be
427 * freed later may be, so that we return 0 to not confuse VM.
433 * Setup server side pool \a pl with passed \a limit.
435 static int ldlm_srv_pool_setup(struct ldlm_pool *pl, int limit)
437 struct obd_device *obd;
439 obd = ldlm_pl2ns(pl)->ns_obd;
440 LASSERT(obd != NULL && obd != LP_POISON);
441 LASSERT(obd->obd_type != LP_POISON);
442 write_lock(&obd->obd_pool_lock);
443 obd->obd_pool_limit = limit;
444 write_unlock(&obd->obd_pool_lock);
446 ldlm_pool_set_limit(pl, limit);
451 * Sets SLV and Limit from ldlm_pl2ns(pl)->ns_obd tp passed \a pl.
453 static void ldlm_cli_pool_pop_slv(struct ldlm_pool *pl)
455 struct obd_device *obd;
458 * Get new SLV and Limit from obd which is updated with coming
461 obd = ldlm_pl2ns(pl)->ns_obd;
462 LASSERT(obd != NULL);
463 read_lock(&obd->obd_pool_lock);
464 pl->pl_server_lock_volume = obd->obd_pool_slv;
465 ldlm_pool_set_limit(pl, obd->obd_pool_limit);
466 read_unlock(&obd->obd_pool_lock);
470 * Recalculates client size pool \a pl according to current SLV and Limit.
472 static int ldlm_cli_pool_recalc(struct ldlm_pool *pl)
474 time_t recalc_interval_sec;
478 recalc_interval_sec = cfs_time_current_sec() - pl->pl_recalc_time;
479 if (recalc_interval_sec < pl->pl_recalc_period)
482 spin_lock(&pl->pl_lock);
484 * Check if we need to recalc lists now.
486 recalc_interval_sec = cfs_time_current_sec() - pl->pl_recalc_time;
487 if (recalc_interval_sec < pl->pl_recalc_period) {
488 spin_unlock(&pl->pl_lock);
493 * Make sure that pool knows last SLV and Limit from obd.
495 ldlm_cli_pool_pop_slv(pl);
496 spin_unlock(&pl->pl_lock);
499 * Do not cancel locks in case lru resize is disabled for this ns.
501 if (!ns_connect_lru_resize(ldlm_pl2ns(pl)))
505 * In the time of canceling locks on client we do not need to maintain
506 * sharp timing, we only want to cancel locks asap according to new SLV.
507 * It may be called when SLV has changed much, this is why we do not
508 * take into account pl->pl_recalc_time here.
510 ret = ldlm_cancel_lru(ldlm_pl2ns(pl), 0, LCF_ASYNC,
514 spin_lock(&pl->pl_lock);
516 * Time of LRU resizing might be longer than period,
517 * so update after LRU resizing rather than before it.
519 pl->pl_recalc_time = cfs_time_current_sec();
520 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_TIMING_STAT,
521 recalc_interval_sec);
522 spin_unlock(&pl->pl_lock);
527 * This function is main entry point for memory pressure handling on client
528 * side. Main goal of this function is to cancel some number of locks on
529 * passed \a pl according to \a nr and \a gfp_mask.
531 static int ldlm_cli_pool_shrink(struct ldlm_pool *pl,
532 int nr, gfp_t gfp_mask)
534 struct ldlm_namespace *ns;
540 * Do not cancel locks in case lru resize is disabled for this ns.
542 if (!ns_connect_lru_resize(ns))
546 * Make sure that pool knows last SLV and Limit from obd.
548 ldlm_cli_pool_pop_slv(pl);
550 spin_lock(&ns->ns_lock);
551 unused = ns->ns_nr_unused;
552 spin_unlock(&ns->ns_lock);
555 return (unused / 100) * sysctl_vfs_cache_pressure;
557 return ldlm_cancel_lru(ns, nr, LCF_ASYNC, LDLM_CANCEL_SHRINK);
560 struct ldlm_pool_ops ldlm_srv_pool_ops = {
561 .po_recalc = ldlm_srv_pool_recalc,
562 .po_shrink = ldlm_srv_pool_shrink,
563 .po_setup = ldlm_srv_pool_setup
566 struct ldlm_pool_ops ldlm_cli_pool_ops = {
567 .po_recalc = ldlm_cli_pool_recalc,
568 .po_shrink = ldlm_cli_pool_shrink
572 * Pool recalc wrapper. Will call either client or server pool recalc callback
573 * depending what pool \a pl is used.
575 int ldlm_pool_recalc(struct ldlm_pool *pl)
577 time_t recalc_interval_sec;
580 recalc_interval_sec = cfs_time_current_sec() - pl->pl_recalc_time;
581 if (recalc_interval_sec <= 0)
584 spin_lock(&pl->pl_lock);
585 if (recalc_interval_sec > 0) {
587 * Update pool statistics every 1s.
589 ldlm_pool_recalc_stats(pl);
592 * Zero out all rates and speed for the last period.
594 atomic_set(&pl->pl_grant_rate, 0);
595 atomic_set(&pl->pl_cancel_rate, 0);
597 spin_unlock(&pl->pl_lock);
600 if (pl->pl_ops->po_recalc != NULL) {
601 count = pl->pl_ops->po_recalc(pl);
602 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_RECALC_STAT,
605 recalc_interval_sec = pl->pl_recalc_time - cfs_time_current_sec() +
606 pl->pl_recalc_period;
607 if (recalc_interval_sec <= 0) {
608 /* Prevent too frequent recalculation. */
609 CDEBUG(D_DLMTRACE, "Negative interval(%ld), "
610 "too short period(%ld)",
612 pl->pl_recalc_period);
613 recalc_interval_sec = 1;
616 return recalc_interval_sec;
620 * Pool shrink wrapper. Will call either client or server pool recalc callback
621 * depending what pool \a pl is used.
623 int ldlm_pool_shrink(struct ldlm_pool *pl, int nr, gfp_t gfp_mask)
627 if (pl->pl_ops->po_shrink != NULL) {
628 cancel = pl->pl_ops->po_shrink(pl, nr, gfp_mask);
630 lprocfs_counter_add(pl->pl_stats,
631 LDLM_POOL_SHRINK_REQTD_STAT,
633 lprocfs_counter_add(pl->pl_stats,
634 LDLM_POOL_SHRINK_FREED_STAT,
636 CDEBUG(D_DLMTRACE, "%s: request to shrink %d locks, "
637 "shrunk %d\n", pl->pl_name, nr, cancel);
642 EXPORT_SYMBOL(ldlm_pool_shrink);
645 * Pool setup wrapper. Will call either client or server pool recalc callback
646 * depending what pool \a pl is used.
648 * Sets passed \a limit into pool \a pl.
650 int ldlm_pool_setup(struct ldlm_pool *pl, int limit)
652 if (pl->pl_ops->po_setup != NULL)
653 return(pl->pl_ops->po_setup(pl, limit));
656 EXPORT_SYMBOL(ldlm_pool_setup);
658 static int lprocfs_pool_state_seq_show(struct seq_file *m, void *unused)
660 int granted, grant_rate, cancel_rate, grant_step;
661 int grant_speed, grant_plan, lvf;
662 struct ldlm_pool *pl = m->private;
666 spin_lock(&pl->pl_lock);
667 slv = pl->pl_server_lock_volume;
668 clv = pl->pl_client_lock_volume;
669 limit = ldlm_pool_get_limit(pl);
670 grant_plan = pl->pl_grant_plan;
671 granted = atomic_read(&pl->pl_granted);
672 grant_rate = atomic_read(&pl->pl_grant_rate);
673 cancel_rate = atomic_read(&pl->pl_cancel_rate);
674 grant_speed = grant_rate - cancel_rate;
675 lvf = atomic_read(&pl->pl_lock_volume_factor);
676 grant_step = ldlm_pool_t2gsp(pl->pl_recalc_period);
677 spin_unlock(&pl->pl_lock);
679 seq_printf(m, "LDLM pool state (%s):\n"
683 pl->pl_name, slv, clv, lvf);
685 if (ns_is_server(ldlm_pl2ns(pl))) {
686 seq_printf(m, " GSP: %d%%\n"
688 grant_step, grant_plan);
690 seq_printf(m, " GR: %d\n" " CR: %d\n" " GS: %d\n"
691 " G: %d\n" " L: %d\n",
692 grant_rate, cancel_rate, grant_speed,
696 LPROC_SEQ_FOPS_RO(lprocfs_pool_state);
698 static int lprocfs_grant_speed_seq_show(struct seq_file *m, void *unused)
700 struct ldlm_pool *pl = m->private;
703 spin_lock(&pl->pl_lock);
704 /* serialize with ldlm_pool_recalc */
705 grant_speed = atomic_read(&pl->pl_grant_rate) -
706 atomic_read(&pl->pl_cancel_rate);
707 spin_unlock(&pl->pl_lock);
708 return lprocfs_uint_seq_show(m, &grant_speed);
711 LDLM_POOL_PROC_READER_SEQ_SHOW(grant_plan, int);
712 LPROC_SEQ_FOPS_RO(lprocfs_grant_plan);
714 LDLM_POOL_PROC_READER_SEQ_SHOW(recalc_period, int);
715 LDLM_POOL_PROC_WRITER(recalc_period, int);
716 static ssize_t lprocfs_recalc_period_seq_write(struct file *file, const char *buf,
717 size_t len, loff_t *off)
719 struct seq_file *seq = file->private_data;
721 return lprocfs_wr_recalc_period(file, buf, len, seq->private);
723 LPROC_SEQ_FOPS(lprocfs_recalc_period);
725 LPROC_SEQ_FOPS_RO_TYPE(ldlm_pool, u64);
726 LPROC_SEQ_FOPS_RO_TYPE(ldlm_pool, atomic);
727 LPROC_SEQ_FOPS_RW_TYPE(ldlm_pool_rw, atomic);
729 LPROC_SEQ_FOPS_RO(lprocfs_grant_speed);
731 static int ldlm_pool_proc_init(struct ldlm_pool *pl)
733 struct ldlm_namespace *ns = ldlm_pl2ns(pl);
734 struct proc_dir_entry *parent_ns_proc;
735 struct lprocfs_seq_vars pool_vars[2];
736 char *var_name = NULL;
740 OBD_ALLOC(var_name, MAX_STRING_SIZE + 1);
744 parent_ns_proc = ns->ns_proc_dir_entry;
745 if (parent_ns_proc == NULL) {
746 CERROR("%s: proc entry is not initialized\n",
748 GOTO(out_free_name, rc = -EINVAL);
750 pl->pl_proc_dir = lprocfs_seq_register("pool", parent_ns_proc,
752 if (IS_ERR(pl->pl_proc_dir)) {
753 rc = PTR_ERR(pl->pl_proc_dir);
754 pl->pl_proc_dir = NULL;
755 CERROR("%s: cannot create 'pool' proc entry: rc = %d\n",
756 ldlm_ns_name(ns), rc);
757 GOTO(out_free_name, rc);
760 var_name[MAX_STRING_SIZE] = '\0';
761 memset(pool_vars, 0, sizeof(pool_vars));
762 pool_vars[0].name = var_name;
764 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "server_lock_volume",
765 &pl->pl_server_lock_volume, &ldlm_pool_u64_fops);
766 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "limit", &pl->pl_limit,
767 &ldlm_pool_rw_atomic_fops);
768 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "granted",
769 &pl->pl_granted, &ldlm_pool_atomic_fops);
770 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "grant_speed", pl,
771 &lprocfs_grant_speed_fops);
772 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "cancel_rate",
773 &pl->pl_cancel_rate, &ldlm_pool_atomic_fops);
774 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "grant_rate",
775 &pl->pl_grant_rate, &ldlm_pool_atomic_fops);
776 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "grant_plan", pl,
777 &lprocfs_grant_plan_fops);
778 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "recalc_period",
779 pl, &lprocfs_recalc_period_fops);
780 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "lock_volume_factor",
781 &pl->pl_lock_volume_factor, &ldlm_pool_rw_atomic_fops);
782 ldlm_add_var(&pool_vars[0], pl->pl_proc_dir, "state", pl,
783 &lprocfs_pool_state_fops);
785 pl->pl_stats = lprocfs_alloc_stats(LDLM_POOL_LAST_STAT -
786 LDLM_POOL_FIRST_STAT, 0);
788 GOTO(out_free_name, rc = -ENOMEM);
790 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_GRANTED_STAT,
791 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
793 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_GRANT_STAT,
794 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
796 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_CANCEL_STAT,
797 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
799 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_GRANT_RATE_STAT,
800 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
801 "grant_rate", "locks/s");
802 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_CANCEL_RATE_STAT,
803 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
804 "cancel_rate", "locks/s");
805 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_GRANT_PLAN_STAT,
806 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
807 "grant_plan", "locks/s");
808 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_SLV_STAT,
809 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
811 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_SHRINK_REQTD_STAT,
812 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
813 "shrink_request", "locks");
814 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_SHRINK_FREED_STAT,
815 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
816 "shrink_freed", "locks");
817 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_RECALC_STAT,
818 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
819 "recalc_freed", "locks");
820 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_TIMING_STAT,
821 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
822 "recalc_timing", "sec");
823 rc = lprocfs_register_stats(pl->pl_proc_dir, "stats", pl->pl_stats);
827 OBD_FREE(var_name, MAX_STRING_SIZE + 1);
831 static void ldlm_pool_proc_fini(struct ldlm_pool *pl)
833 if (pl->pl_stats != NULL) {
834 lprocfs_free_stats(&pl->pl_stats);
837 if (pl->pl_proc_dir != NULL) {
838 lprocfs_remove(&pl->pl_proc_dir);
839 pl->pl_proc_dir = NULL;
843 int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns,
844 int idx, ldlm_side_t client)
849 spin_lock_init(&pl->pl_lock);
850 atomic_set(&pl->pl_granted, 0);
851 pl->pl_recalc_time = cfs_time_current_sec();
852 atomic_set(&pl->pl_lock_volume_factor, 1);
854 atomic_set(&pl->pl_grant_rate, 0);
855 atomic_set(&pl->pl_cancel_rate, 0);
856 pl->pl_grant_plan = LDLM_POOL_GP(LDLM_POOL_HOST_L);
858 snprintf(pl->pl_name, sizeof(pl->pl_name), "ldlm-pool-%s-%d",
859 ldlm_ns_name(ns), idx);
861 if (client == LDLM_NAMESPACE_SERVER) {
862 pl->pl_ops = &ldlm_srv_pool_ops;
863 ldlm_pool_set_limit(pl, LDLM_POOL_HOST_L);
864 pl->pl_recalc_period = LDLM_POOL_SRV_DEF_RECALC_PERIOD;
865 pl->pl_server_lock_volume = ldlm_pool_slv_max(LDLM_POOL_HOST_L);
867 ldlm_pool_set_limit(pl, 1);
868 pl->pl_server_lock_volume = 0;
869 pl->pl_ops = &ldlm_cli_pool_ops;
870 pl->pl_recalc_period = LDLM_POOL_CLI_DEF_RECALC_PERIOD;
872 pl->pl_client_lock_volume = 0;
873 rc = ldlm_pool_proc_init(pl);
877 CDEBUG(D_DLMTRACE, "Lock pool %s is initialized\n", pl->pl_name);
881 EXPORT_SYMBOL(ldlm_pool_init);
883 void ldlm_pool_fini(struct ldlm_pool *pl)
886 ldlm_pool_proc_fini(pl);
889 * Pool should not be used after this point. We can't free it here as
890 * it lives in struct ldlm_namespace, but still interested in catching
891 * any abnormal using cases.
893 POISON(pl, 0x5a, sizeof(*pl));
896 EXPORT_SYMBOL(ldlm_pool_fini);
899 * Add new taken ldlm lock \a lock into pool \a pl accounting.
901 void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock)
904 * FLOCK locks are special in a sense that they are almost never
905 * cancelled, instead special kind of lock is used to drop them.
906 * also there is no LRU for flock locks, so no point in tracking
909 if (lock->l_resource->lr_type == LDLM_FLOCK)
912 atomic_inc(&pl->pl_granted);
913 atomic_inc(&pl->pl_grant_rate);
914 lprocfs_counter_incr(pl->pl_stats, LDLM_POOL_GRANT_STAT);
916 * Do not do pool recalc for client side as all locks which
917 * potentially may be canceled has already been packed into
918 * enqueue/cancel rpc. Also we do not want to run out of stack
919 * with too long call paths.
921 if (ns_is_server(ldlm_pl2ns(pl)))
922 ldlm_pool_recalc(pl);
924 EXPORT_SYMBOL(ldlm_pool_add);
927 * Remove ldlm lock \a lock from pool \a pl accounting.
929 void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock)
932 * Filter out FLOCK locks. Read above comment in ldlm_pool_add().
934 if (lock->l_resource->lr_type == LDLM_FLOCK)
937 LASSERT(atomic_read(&pl->pl_granted) > 0);
938 atomic_dec(&pl->pl_granted);
939 atomic_inc(&pl->pl_cancel_rate);
941 lprocfs_counter_incr(pl->pl_stats, LDLM_POOL_CANCEL_STAT);
943 if (ns_is_server(ldlm_pl2ns(pl)))
944 ldlm_pool_recalc(pl);
946 EXPORT_SYMBOL(ldlm_pool_del);
949 * Returns current \a pl SLV.
951 * \pre ->pl_lock is not locked.
953 __u64 ldlm_pool_get_slv(struct ldlm_pool *pl)
956 spin_lock(&pl->pl_lock);
957 slv = pl->pl_server_lock_volume;
958 spin_unlock(&pl->pl_lock);
961 EXPORT_SYMBOL(ldlm_pool_get_slv);
964 * Sets passed \a slv to \a pl.
966 * \pre ->pl_lock is not locked.
968 void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv)
970 spin_lock(&pl->pl_lock);
971 pl->pl_server_lock_volume = slv;
972 spin_unlock(&pl->pl_lock);
974 EXPORT_SYMBOL(ldlm_pool_set_slv);
977 * Returns current \a pl CLV.
979 * \pre ->pl_lock is not locked.
981 __u64 ldlm_pool_get_clv(struct ldlm_pool *pl)
984 spin_lock(&pl->pl_lock);
985 slv = pl->pl_client_lock_volume;
986 spin_unlock(&pl->pl_lock);
989 EXPORT_SYMBOL(ldlm_pool_get_clv);
992 * Sets passed \a clv to \a pl.
994 * \pre ->pl_lock is not locked.
996 void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv)
998 spin_lock(&pl->pl_lock);
999 pl->pl_client_lock_volume = clv;
1000 spin_unlock(&pl->pl_lock);
1002 EXPORT_SYMBOL(ldlm_pool_set_clv);
1005 * Returns current \a pl limit.
1007 __u32 ldlm_pool_get_limit(struct ldlm_pool *pl)
1009 return atomic_read(&pl->pl_limit);
1011 EXPORT_SYMBOL(ldlm_pool_get_limit);
1014 * Sets passed \a limit to \a pl.
1016 void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit)
1018 atomic_set(&pl->pl_limit, limit);
1020 EXPORT_SYMBOL(ldlm_pool_set_limit);
1023 * Returns current LVF from \a pl.
1025 __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl)
1027 return atomic_read(&pl->pl_lock_volume_factor);
1029 EXPORT_SYMBOL(ldlm_pool_get_lvf);
1031 static unsigned int ldlm_pool_granted(struct ldlm_pool *pl)
1033 return atomic_read(&pl->pl_granted);
1036 static struct ptlrpc_thread *ldlm_pools_thread;
1037 static struct shrinker *ldlm_pools_srv_shrinker;
1038 static struct shrinker *ldlm_pools_cli_shrinker;
1039 static struct completion ldlm_pools_comp;
1042 * count locks from all namespaces (if possible). Returns number of
1045 static unsigned long ldlm_pools_count(ldlm_side_t client, gfp_t gfp_mask)
1047 int total = 0, nr_ns;
1048 struct ldlm_namespace *ns;
1049 struct ldlm_namespace *ns_old = NULL; /* loop detection */
1052 if (client == LDLM_NAMESPACE_CLIENT && !(gfp_mask & __GFP_FS))
1055 CDEBUG(D_DLMTRACE, "Request to count %s locks from all pools\n",
1056 client == LDLM_NAMESPACE_CLIENT ? "client" : "server");
1058 cookie = cl_env_reenter();
1061 * Find out how many resources we may release.
1063 for (nr_ns = ldlm_namespace_nr_read(client);
1064 nr_ns > 0; nr_ns--) {
1065 mutex_lock(ldlm_namespace_lock(client));
1066 if (list_empty(ldlm_namespace_list(client))) {
1067 mutex_unlock(ldlm_namespace_lock(client));
1068 cl_env_reexit(cookie);
1071 ns = ldlm_namespace_first_locked(client);
1074 mutex_unlock(ldlm_namespace_lock(client));
1078 if (ldlm_ns_empty(ns)) {
1079 ldlm_namespace_move_to_inactive_locked(ns, client);
1080 mutex_unlock(ldlm_namespace_lock(client));
1087 ldlm_namespace_get(ns);
1088 ldlm_namespace_move_to_active_locked(ns, client);
1089 mutex_unlock(ldlm_namespace_lock(client));
1090 total += ldlm_pool_shrink(&ns->ns_pool, 0, gfp_mask);
1091 ldlm_namespace_put(ns);
1094 cl_env_reexit(cookie);
1098 static unsigned long ldlm_pools_scan(ldlm_side_t client, int nr,
1101 unsigned long freed = 0;
1103 struct ldlm_namespace *ns;
1106 if (client == LDLM_NAMESPACE_CLIENT && !(gfp_mask & __GFP_FS))
1109 cookie = cl_env_reenter();
1112 * Shrink at least ldlm_namespace_nr_read(client) namespaces.
1114 for (tmp = nr_ns = ldlm_namespace_nr_read(client);
1116 int cancel, nr_locks;
1119 * Do not call shrink under ldlm_namespace_lock(client)
1121 mutex_lock(ldlm_namespace_lock(client));
1122 if (list_empty(ldlm_namespace_list(client))) {
1123 mutex_unlock(ldlm_namespace_lock(client));
1126 ns = ldlm_namespace_first_locked(client);
1127 ldlm_namespace_get(ns);
1128 ldlm_namespace_move_to_active_locked(ns, client);
1129 mutex_unlock(ldlm_namespace_lock(client));
1131 nr_locks = ldlm_pool_granted(&ns->ns_pool);
1133 * We use to shrink propotionally but with new shrinker API,
1134 * we lost the total number of freeable locks.
1136 cancel = 1 + min_t(int, nr_locks, nr / nr_ns);
1137 freed += ldlm_pool_shrink(&ns->ns_pool, cancel, gfp_mask);
1138 ldlm_namespace_put(ns);
1140 cl_env_reexit(cookie);
1142 * we only decrease the SLV in server pools shrinker, return
1143 * SHRINK_STOP to kernel to avoid needless loop. LU-1128
1145 return (client == LDLM_NAMESPACE_SERVER) ? SHRINK_STOP : freed;
1148 #ifdef HAVE_SHRINKER_COUNT
1149 static unsigned long ldlm_pools_srv_count(struct shrinker *s,
1150 struct shrink_control *sc)
1152 return ldlm_pools_count(LDLM_NAMESPACE_SERVER, sc->gfp_mask);
1155 static unsigned long ldlm_pools_srv_scan(struct shrinker *s,
1156 struct shrink_control *sc)
1158 return ldlm_pools_scan(LDLM_NAMESPACE_SERVER, sc->nr_to_scan,
1162 static unsigned long ldlm_pools_cli_count(struct shrinker *s, struct shrink_control *sc)
1164 return ldlm_pools_count(LDLM_NAMESPACE_CLIENT, sc->gfp_mask);
1167 static unsigned long ldlm_pools_cli_scan(struct shrinker *s,
1168 struct shrink_control *sc)
1170 return ldlm_pools_scan(LDLM_NAMESPACE_CLIENT, sc->nr_to_scan,
1176 * Cancel \a nr locks from all namespaces (if possible). Returns number of
1177 * cached locks after shrink is finished. All namespaces are asked to
1178 * cancel approximately equal amount of locks to keep balancing.
1180 static int ldlm_pools_shrink(ldlm_side_t client, int nr,
1183 unsigned int total = 0;
1185 if (client == LDLM_NAMESPACE_CLIENT && nr != 0 &&
1186 !(gfp_mask & __GFP_FS))
1189 CDEBUG(D_DLMTRACE, "Request to shrink %d %s locks from all pools\n",
1190 nr, client == LDLM_NAMESPACE_CLIENT ? "client" : "server");
1192 total = ldlm_pools_count(client, gfp_mask);
1194 if (nr == 0 || total == 0)
1197 return ldlm_pools_scan(client, nr, gfp_mask);
1200 static int ldlm_pools_srv_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
1202 return ldlm_pools_shrink(LDLM_NAMESPACE_SERVER,
1203 shrink_param(sc, nr_to_scan),
1204 shrink_param(sc, gfp_mask));
1207 static int ldlm_pools_cli_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
1209 return ldlm_pools_shrink(LDLM_NAMESPACE_CLIENT,
1210 shrink_param(sc, nr_to_scan),
1211 shrink_param(sc, gfp_mask));
1214 #endif /* HAVE_SHRINKER_COUNT */
1216 int ldlm_pools_recalc(ldlm_side_t client)
1218 __u32 nr_l = 0, nr_p = 0, l;
1219 struct ldlm_namespace *ns;
1220 struct ldlm_namespace *ns_old = NULL;
1222 int time = 50; /* seconds of sleep if no active namespaces */
1225 * No need to setup pool limit for client pools.
1227 if (client == LDLM_NAMESPACE_SERVER) {
1229 * Check all modest namespaces first.
1231 mutex_lock(ldlm_namespace_lock(client));
1232 list_for_each_entry(ns, ldlm_namespace_list(client),
1235 if (ns->ns_appetite != LDLM_NAMESPACE_MODEST)
1238 l = ldlm_pool_granted(&ns->ns_pool);
1243 * Set the modest pools limit equal to their avg granted
1246 l += dru(l, LDLM_POOLS_MODEST_MARGIN_SHIFT, 0);
1247 ldlm_pool_setup(&ns->ns_pool, l);
1253 * Make sure that modest namespaces did not eat more that 2/3
1256 if (nr_l >= 2 * (LDLM_POOL_HOST_L / 3)) {
1257 CWARN("\"Modest\" pools eat out 2/3 of server locks "
1258 "limit (%d of %lu). This means that you have too "
1259 "many clients for this amount of server RAM. "
1260 "Upgrade server!\n", nr_l, LDLM_POOL_HOST_L);
1265 * The rest is given to greedy namespaces.
1267 list_for_each_entry(ns, ldlm_namespace_list(client),
1270 if (!equal && ns->ns_appetite != LDLM_NAMESPACE_GREEDY)
1275 * In the case 2/3 locks are eaten out by
1276 * modest pools, we re-setup equal limit
1279 l = LDLM_POOL_HOST_L /
1280 ldlm_namespace_nr_read(client);
1283 * All the rest of greedy pools will have
1284 * all locks in equal parts.
1286 l = (LDLM_POOL_HOST_L - nr_l) /
1287 (ldlm_namespace_nr_read(client) -
1290 ldlm_pool_setup(&ns->ns_pool, l);
1292 mutex_unlock(ldlm_namespace_lock(client));
1296 * Recalc at least ldlm_namespace_nr(client) namespaces.
1298 for (nr = ldlm_namespace_nr_read(client); nr > 0; nr--) {
1301 * Lock the list, get first @ns in the list, getref, move it
1302 * to the tail, unlock and call pool recalc. This way we avoid
1303 * calling recalc under @ns lock what is really good as we get
1304 * rid of potential deadlock on client nodes when canceling
1305 * locks synchronously.
1307 mutex_lock(ldlm_namespace_lock(client));
1308 if (list_empty(ldlm_namespace_list(client))) {
1309 mutex_unlock(ldlm_namespace_lock(client));
1312 ns = ldlm_namespace_first_locked(client);
1314 if (ns_old == ns) { /* Full pass complete */
1315 mutex_unlock(ldlm_namespace_lock(client));
1319 /* We got an empty namespace, need to move it back to inactive
1321 * The race with parallel resource creation is fine:
1322 * - If they do namespace_get before our check, we fail the
1323 * check and they move this item to the end of the list anyway
1324 * - If we do the check and then they do namespace_get, then
1325 * we move the namespace to inactive and they will move
1326 * it back to active (synchronised by the lock, so no clash
1329 if (ldlm_ns_empty(ns)) {
1330 ldlm_namespace_move_to_inactive_locked(ns, client);
1331 mutex_unlock(ldlm_namespace_lock(client));
1338 spin_lock(&ns->ns_lock);
1340 * skip ns which is being freed, and we don't want to increase
1341 * its refcount again, not even temporarily. bz21519 & LU-499.
1343 if (ns->ns_stopping) {
1347 ldlm_namespace_get(ns);
1349 spin_unlock(&ns->ns_lock);
1351 ldlm_namespace_move_to_active_locked(ns, client);
1352 mutex_unlock(ldlm_namespace_lock(client));
1355 * After setup is done - recalc the pool.
1358 int ttime = ldlm_pool_recalc(&ns->ns_pool);
1363 ldlm_namespace_put(ns);
1368 EXPORT_SYMBOL(ldlm_pools_recalc);
1370 static int ldlm_pools_thread_main(void *arg)
1372 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
1376 thread_set_flags(thread, SVC_RUNNING);
1377 wake_up(&thread->t_ctl_waitq);
1379 CDEBUG(D_DLMTRACE, "%s: pool thread starting, process %d\n",
1380 "ldlm_poold", current_pid());
1383 struct l_wait_info lwi;
1386 * Recal all pools on this tick.
1388 s_time = ldlm_pools_recalc(LDLM_NAMESPACE_SERVER);
1389 c_time = ldlm_pools_recalc(LDLM_NAMESPACE_CLIENT);
1392 * Wait until the next check time, or until we're
1395 lwi = LWI_TIMEOUT(cfs_time_seconds(min(s_time, c_time)),
1397 l_wait_event(thread->t_ctl_waitq,
1398 thread_is_stopping(thread) ||
1399 thread_is_event(thread),
1402 if (thread_test_and_clear_flags(thread, SVC_STOPPING))
1405 thread_test_and_clear_flags(thread, SVC_EVENT);
1408 thread_set_flags(thread, SVC_STOPPED);
1409 wake_up(&thread->t_ctl_waitq);
1411 CDEBUG(D_DLMTRACE, "%s: pool thread exiting, process %d\n",
1412 "ldlm_poold", current_pid());
1414 complete_and_exit(&ldlm_pools_comp, 0);
1417 static int ldlm_pools_thread_start(void)
1419 struct l_wait_info lwi = { 0 };
1420 struct task_struct *task;
1423 if (ldlm_pools_thread != NULL)
1426 OBD_ALLOC_PTR(ldlm_pools_thread);
1427 if (ldlm_pools_thread == NULL)
1430 init_completion(&ldlm_pools_comp);
1431 init_waitqueue_head(&ldlm_pools_thread->t_ctl_waitq);
1433 task = kthread_run(ldlm_pools_thread_main, ldlm_pools_thread,
1436 CERROR("Can't start pool thread, error %ld\n", PTR_ERR(task));
1437 OBD_FREE(ldlm_pools_thread, sizeof(*ldlm_pools_thread));
1438 ldlm_pools_thread = NULL;
1439 RETURN(PTR_ERR(task));
1441 l_wait_event(ldlm_pools_thread->t_ctl_waitq,
1442 thread_is_running(ldlm_pools_thread), &lwi);
1446 static void ldlm_pools_thread_stop(void)
1450 if (ldlm_pools_thread == NULL) {
1455 thread_set_flags(ldlm_pools_thread, SVC_STOPPING);
1456 wake_up(&ldlm_pools_thread->t_ctl_waitq);
1459 * Make sure that pools thread is finished before freeing @thread.
1460 * This fixes possible race and oops due to accessing freed memory
1463 wait_for_completion(&ldlm_pools_comp);
1464 OBD_FREE_PTR(ldlm_pools_thread);
1465 ldlm_pools_thread = NULL;
1469 int ldlm_pools_init(void)
1472 DEF_SHRINKER_VAR(shsvar, ldlm_pools_srv_shrink,
1473 ldlm_pools_srv_count, ldlm_pools_srv_scan);
1474 DEF_SHRINKER_VAR(shcvar, ldlm_pools_cli_shrink,
1475 ldlm_pools_cli_count, ldlm_pools_cli_scan);
1478 rc = ldlm_pools_thread_start();
1480 ldlm_pools_srv_shrinker =
1481 set_shrinker(DEFAULT_SEEKS, &shsvar);
1482 ldlm_pools_cli_shrinker =
1483 set_shrinker(DEFAULT_SEEKS, &shcvar);
1487 EXPORT_SYMBOL(ldlm_pools_init);
1489 void ldlm_pools_fini(void)
1491 if (ldlm_pools_srv_shrinker != NULL) {
1492 remove_shrinker(ldlm_pools_srv_shrinker);
1493 ldlm_pools_srv_shrinker = NULL;
1495 if (ldlm_pools_cli_shrinker != NULL) {
1496 remove_shrinker(ldlm_pools_cli_shrinker);
1497 ldlm_pools_cli_shrinker = NULL;
1499 ldlm_pools_thread_stop();
1501 EXPORT_SYMBOL(ldlm_pools_fini);
1503 #else /* !HAVE_LRU_RESIZE_SUPPORT */
1504 int ldlm_pool_setup(struct ldlm_pool *pl, int limit)
1508 EXPORT_SYMBOL(ldlm_pool_setup);
1510 int ldlm_pool_recalc(struct ldlm_pool *pl)
1514 EXPORT_SYMBOL(ldlm_pool_recalc);
1516 int ldlm_pool_shrink(struct ldlm_pool *pl,
1517 int nr, gfp_t gfp_mask)
1521 EXPORT_SYMBOL(ldlm_pool_shrink);
1523 int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns,
1524 int idx, ldlm_side_t client)
1528 EXPORT_SYMBOL(ldlm_pool_init);
1530 void ldlm_pool_fini(struct ldlm_pool *pl)
1534 EXPORT_SYMBOL(ldlm_pool_fini);
1536 void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock)
1540 EXPORT_SYMBOL(ldlm_pool_add);
1542 void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock)
1546 EXPORT_SYMBOL(ldlm_pool_del);
1548 __u64 ldlm_pool_get_slv(struct ldlm_pool *pl)
1552 EXPORT_SYMBOL(ldlm_pool_get_slv);
1554 void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv)
1558 EXPORT_SYMBOL(ldlm_pool_set_slv);
1560 __u64 ldlm_pool_get_clv(struct ldlm_pool *pl)
1564 EXPORT_SYMBOL(ldlm_pool_get_clv);
1566 void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv)
1570 EXPORT_SYMBOL(ldlm_pool_set_clv);
1572 __u32 ldlm_pool_get_limit(struct ldlm_pool *pl)
1576 EXPORT_SYMBOL(ldlm_pool_get_limit);
1578 void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit)
1582 EXPORT_SYMBOL(ldlm_pool_set_limit);
1584 __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl)
1588 EXPORT_SYMBOL(ldlm_pool_get_lvf);
1590 int ldlm_pools_init(void)
1594 EXPORT_SYMBOL(ldlm_pools_init);
1596 void ldlm_pools_fini(void)
1600 EXPORT_SYMBOL(ldlm_pools_fini);
1602 int ldlm_pools_recalc(ldlm_side_t client)
1606 EXPORT_SYMBOL(ldlm_pools_recalc);
1607 #endif /* HAVE_LRU_RESIZE_SUPPORT */