1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
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15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
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
101 # include <lustre_dlm.h>
103 # include <liblustre.h>
106 #include <cl_object.h>
108 #include <obd_class.h>
109 #include <obd_support.h>
110 #include "ldlm_internal.h"
112 #ifdef HAVE_LRU_RESIZE_SUPPORT
115 * 50 ldlm locks for 1MB of RAM.
117 #define LDLM_POOL_HOST_L ((num_physpages >> (20 - CFS_PAGE_SHIFT)) * 50)
120 * Maximal possible grant step plan in %.
122 #define LDLM_POOL_MAX_GSP (30)
125 * Minimal possible grant step plan in %.
127 #define LDLM_POOL_MIN_GSP (1)
130 * This controls the speed of reaching LDLM_POOL_MAX_GSP
131 * with increasing thread period.
133 #define LDLM_POOL_GSP_STEP (4)
136 * LDLM_POOL_GSP% of all locks is default GP.
138 #define LDLM_POOL_GP(L) (((L) * LDLM_POOL_MAX_GSP) / 100)
141 * Max age for locks on clients.
143 #define LDLM_POOL_MAX_AGE (36000)
146 extern cfs_proc_dir_entry_t *ldlm_ns_proc_dir;
149 #define avg(src, add) \
150 ((src) = ((src) + (add)) / 2)
152 static inline __u64 dru(__u64 val, __u32 div)
154 __u64 ret = val + (div - 1);
159 static inline __u64 ldlm_pool_slv_max(__u32 L)
162 * Allow to have all locks for 1 client for 10 hrs.
163 * Formula is the following: limit * 10h / 1 client.
165 __u64 lim = L * LDLM_POOL_MAX_AGE / 1;
169 static inline __u64 ldlm_pool_slv_min(__u32 L)
175 LDLM_POOL_FIRST_STAT = 0,
176 LDLM_POOL_GRANTED_STAT = LDLM_POOL_FIRST_STAT,
177 LDLM_POOL_GRANT_STAT,
178 LDLM_POOL_CANCEL_STAT,
179 LDLM_POOL_GRANT_RATE_STAT,
180 LDLM_POOL_CANCEL_RATE_STAT,
181 LDLM_POOL_GRANT_PLAN_STAT,
183 LDLM_POOL_SHRINK_REQTD_STAT,
184 LDLM_POOL_SHRINK_FREED_STAT,
185 LDLM_POOL_RECALC_STAT,
186 LDLM_POOL_TIMING_STAT,
190 static inline struct ldlm_namespace *ldlm_pl2ns(struct ldlm_pool *pl)
192 return container_of(pl, struct ldlm_namespace, ns_pool);
196 * Calculates suggested grant_step in % of available locks for passed
197 * \a period. This is later used in grant_plan calculations.
199 static inline int ldlm_pool_t2gsp(int t)
202 * This yeilds 1% grant step for anything below LDLM_POOL_GSP_STEP
203 * and up to 30% for anything higher than LDLM_POOL_GSP_STEP.
205 * How this will affect execution is the following:
207 * - for thread peroid 1s we will have grant_step 1% which good from
208 * pov of taking some load off from server and push it out to clients.
209 * This is like that because 1% for grant_step means that server will
210 * not allow clients to get lots of locks inshort period of time and
211 * keep all old locks in their caches. Clients will always have to
212 * get some locks back if they want to take some new;
214 * - for thread period 10s (which is default) we will have 23% which
215 * means that clients will have enough of room to take some new locks
216 * without getting some back. All locks from this 23% which were not
217 * taken by clients in current period will contribute in SLV growing.
218 * SLV growing means more locks cached on clients until limit or grant
221 return LDLM_POOL_MAX_GSP -
222 (LDLM_POOL_MAX_GSP - LDLM_POOL_MIN_GSP) /
223 (1 << (t / LDLM_POOL_GSP_STEP));
227 * Recalculates next grant limit on passed \a pl.
229 * \pre ->pl_lock is locked.
231 static inline void ldlm_pool_recalc_grant_plan(struct ldlm_pool *pl)
233 int granted, grant_step, limit;
235 limit = ldlm_pool_get_limit(pl);
236 granted = atomic_read(&pl->pl_granted);
238 grant_step = ldlm_pool_t2gsp(pl->pl_recalc_period);
239 grant_step = ((limit - granted) * grant_step) / 100;
240 pl->pl_grant_plan = granted + grant_step;
244 * Recalculates next SLV on passed \a pl.
246 * \pre ->pl_lock is locked.
248 static inline void ldlm_pool_recalc_slv(struct ldlm_pool *pl)
250 int grant_usage, granted, grant_plan;
251 __u64 slv, slv_factor;
254 slv = pl->pl_server_lock_volume;
255 grant_plan = pl->pl_grant_plan;
256 limit = ldlm_pool_get_limit(pl);
257 granted = atomic_read(&pl->pl_granted);
259 grant_usage = limit - (granted - grant_plan);
260 if (grant_usage <= 0)
264 * Find out SLV change factor which is the ratio of grant usage
265 * from limit. SLV changes as fast as the ratio of grant plan
266 * consumtion. The more locks from grant plan are not consumed
267 * by clients in last interval (idle time), the faster grows
268 * SLV. And the opposite, the more grant plan is over-consumed
269 * (load time) the faster drops SLV.
271 slv_factor = (grant_usage * 100) / limit;
272 if (2 * abs(granted - limit) > limit) {
273 slv_factor *= slv_factor;
274 slv_factor = dru(slv_factor, 100);
276 slv = slv * slv_factor;
279 if (slv > ldlm_pool_slv_max(limit)) {
280 slv = ldlm_pool_slv_max(limit);
281 } else if (slv < ldlm_pool_slv_min(limit)) {
282 slv = ldlm_pool_slv_min(limit);
285 pl->pl_server_lock_volume = slv;
289 * Recalculates next stats on passed \a pl.
291 * \pre ->pl_lock is locked.
293 static inline void ldlm_pool_recalc_stats(struct ldlm_pool *pl)
295 int grant_plan = pl->pl_grant_plan;
296 __u64 slv = pl->pl_server_lock_volume;
297 int granted = atomic_read(&pl->pl_granted);
298 int grant_rate = atomic_read(&pl->pl_grant_rate);
299 int cancel_rate = atomic_read(&pl->pl_cancel_rate);
301 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_SLV_STAT,
303 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_GRANTED_STAT,
305 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_GRANT_RATE_STAT,
307 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_GRANT_PLAN_STAT,
309 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_CANCEL_RATE_STAT,
314 * Sets current SLV into obd accessible via ldlm_pl2ns(pl)->ns_obd.
316 static void ldlm_srv_pool_push_slv(struct ldlm_pool *pl)
318 struct obd_device *obd;
321 * Set new SLV in obd field for using it later without accessing the
322 * pool. This is required to avoid race between sending reply to client
323 * with new SLV and cleanup server stack in which we can't guarantee
324 * that namespace is still alive. We know only that obd is alive as
325 * long as valid export is alive.
327 obd = ldlm_pl2ns(pl)->ns_obd;
328 LASSERT(obd != NULL);
329 write_lock(&obd->obd_pool_lock);
330 obd->obd_pool_slv = pl->pl_server_lock_volume;
331 write_unlock(&obd->obd_pool_lock);
335 * Recalculates all pool fields on passed \a pl.
337 * \pre ->pl_lock is not locked.
339 static int ldlm_srv_pool_recalc(struct ldlm_pool *pl)
341 time_t recalc_interval_sec;
344 spin_lock(&pl->pl_lock);
345 recalc_interval_sec = cfs_time_current_sec() - pl->pl_recalc_time;
346 if (recalc_interval_sec >= pl->pl_recalc_period) {
348 * Recalc SLV after last period. This should be done
349 * _before_ recalculating new grant plan.
351 ldlm_pool_recalc_slv(pl);
354 * Make sure that pool informed obd of last SLV changes.
356 ldlm_srv_pool_push_slv(pl);
359 * Update grant_plan for new period.
361 ldlm_pool_recalc_grant_plan(pl);
363 pl->pl_recalc_time = cfs_time_current_sec();
364 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_TIMING_STAT,
365 recalc_interval_sec);
368 spin_unlock(&pl->pl_lock);
373 * This function is used on server side as main entry point for memory
374 * preasure 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, unsigned int gfp_mask)
387 * VM is asking how many entries may be potentially freed.
390 RETURN(atomic_read(&pl->pl_granted));
393 * Client already canceled locks but server is already in shrinker
394 * and can't cancel anything. Let's catch this race.
396 if (atomic_read(&pl->pl_granted) == 0)
399 spin_lock(&pl->pl_lock);
402 * We want shrinker to possibly cause cancelation of @nr locks from
403 * clients or grant approximately @nr locks smaller next intervals.
405 * This is why we decresed SLV by @nr. This effect will only be as
406 * long as one re-calc interval (1s these days) and this should be
407 * enough to pass this decreased SLV to all clients. On next recalc
408 * interval pool will either increase SLV if locks load is not high
409 * or will keep on same level or even decrease again, thus, shrinker
410 * decreased SLV will affect next recalc intervals and this way will
411 * make locking load lower.
413 if (nr < pl->pl_server_lock_volume) {
414 pl->pl_server_lock_volume = pl->pl_server_lock_volume - nr;
416 limit = ldlm_pool_get_limit(pl);
417 pl->pl_server_lock_volume = ldlm_pool_slv_min(limit);
421 * Make sure that pool informed obd of last SLV changes.
423 ldlm_srv_pool_push_slv(pl);
424 spin_unlock(&pl->pl_lock);
427 * We did not really free any memory here so far, it only will be
428 * freed later may be, so that we return 0 to not confuse VM.
434 * Setup server side pool \a pl with passed \a limit.
436 static int ldlm_srv_pool_setup(struct ldlm_pool *pl, int limit)
438 struct obd_device *obd;
441 obd = ldlm_pl2ns(pl)->ns_obd;
442 LASSERT(obd != NULL && obd != LP_POISON);
443 LASSERT(obd->obd_type != LP_POISON);
444 write_lock(&obd->obd_pool_lock);
445 obd->obd_pool_limit = limit;
446 write_unlock(&obd->obd_pool_lock);
448 ldlm_pool_set_limit(pl, limit);
453 * Sets SLV and Limit from ldlm_pl2ns(pl)->ns_obd tp passed \a pl.
455 static void ldlm_cli_pool_pop_slv(struct ldlm_pool *pl)
457 struct obd_device *obd;
460 * Get new SLV and Limit from obd which is updated with comming
463 obd = ldlm_pl2ns(pl)->ns_obd;
464 LASSERT(obd != NULL);
465 read_lock(&obd->obd_pool_lock);
466 pl->pl_server_lock_volume = obd->obd_pool_slv;
467 ldlm_pool_set_limit(pl, obd->obd_pool_limit);
468 read_unlock(&obd->obd_pool_lock);
472 * Recalculates client sise pool \a pl according to current SLV and Limit.
474 static int ldlm_cli_pool_recalc(struct ldlm_pool *pl)
476 time_t recalc_interval_sec;
479 spin_lock(&pl->pl_lock);
481 * Check if we need to recalc lists now.
483 recalc_interval_sec = cfs_time_current_sec() - pl->pl_recalc_time;
484 if (recalc_interval_sec < pl->pl_recalc_period) {
485 spin_unlock(&pl->pl_lock);
490 * Make sure that pool knows last SLV and Limit from obd.
492 ldlm_cli_pool_pop_slv(pl);
494 pl->pl_recalc_time = cfs_time_current_sec();
495 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_TIMING_STAT,
496 recalc_interval_sec);
497 spin_unlock(&pl->pl_lock);
500 * Do not cancel locks in case lru resize is disabled for this ns.
502 if (!ns_connect_lru_resize(ldlm_pl2ns(pl)))
506 * In the time of canceling locks on client we do not need to maintain
507 * sharp timing, we only want to cancel locks asap according to new SLV.
508 * It may be called when SLV has changed much, this is why we do not
509 * take into account pl->pl_recalc_time here.
511 RETURN(ldlm_cancel_lru(ldlm_pl2ns(pl), 0, LDLM_ASYNC,
516 * This function is main entry point for memory preasure handling on client side.
517 * Main goal of this function is to cancel some number of locks on passed \a pl
518 * according to \a nr and \a gfp_mask.
520 static int ldlm_cli_pool_shrink(struct ldlm_pool *pl,
521 int nr, unsigned int gfp_mask)
526 * Do not cancel locks in case lru resize is disabled for this ns.
528 if (!ns_connect_lru_resize(ldlm_pl2ns(pl)))
532 * Make sure that pool knows last SLV and Limit from obd.
534 ldlm_cli_pool_pop_slv(pl);
537 * Find out how many locks may be released according to shrink
541 RETURN(ldlm_cancel_lru_estimate(ldlm_pl2ns(pl), 0, 0,
542 LDLM_CANCEL_SHRINK));
545 * Cancel @nr locks accoding to shrink policy.
547 RETURN(ldlm_cancel_lru(ldlm_pl2ns(pl), nr, LDLM_SYNC,
548 LDLM_CANCEL_SHRINK));
551 struct ldlm_pool_ops ldlm_srv_pool_ops = {
552 .po_recalc = ldlm_srv_pool_recalc,
553 .po_shrink = ldlm_srv_pool_shrink,
554 .po_setup = ldlm_srv_pool_setup
557 struct ldlm_pool_ops ldlm_cli_pool_ops = {
558 .po_recalc = ldlm_cli_pool_recalc,
559 .po_shrink = ldlm_cli_pool_shrink
563 * Pool recalc wrapper. Will call either client or server pool recalc callback
564 * depending what pool \a pl is used.
566 int ldlm_pool_recalc(struct ldlm_pool *pl)
568 time_t recalc_interval_sec;
571 spin_lock(&pl->pl_lock);
572 recalc_interval_sec = cfs_time_current_sec() - pl->pl_recalc_time;
573 if (recalc_interval_sec > 0) {
575 * Update pool statistics every 1s.
577 ldlm_pool_recalc_stats(pl);
580 * Zero out all rates and speed for the last period.
582 atomic_set(&pl->pl_grant_rate, 0);
583 atomic_set(&pl->pl_cancel_rate, 0);
584 atomic_set(&pl->pl_grant_speed, 0);
586 spin_unlock(&pl->pl_lock);
588 if (pl->pl_ops->po_recalc != NULL) {
589 count = pl->pl_ops->po_recalc(pl);
590 lprocfs_counter_add(pl->pl_stats, LDLM_POOL_RECALC_STAT,
597 EXPORT_SYMBOL(ldlm_pool_recalc);
600 * Pool shrink wrapper. Will call either client or server pool recalc callback
601 * depending what pool \a pl is used.
603 int ldlm_pool_shrink(struct ldlm_pool *pl, int nr,
604 unsigned int gfp_mask)
608 if (pl->pl_ops->po_shrink != NULL) {
609 cancel = pl->pl_ops->po_shrink(pl, nr, gfp_mask);
611 lprocfs_counter_add(pl->pl_stats,
612 LDLM_POOL_SHRINK_REQTD_STAT,
614 lprocfs_counter_add(pl->pl_stats,
615 LDLM_POOL_SHRINK_FREED_STAT,
617 CDEBUG(D_DLMTRACE, "%s: request to shrink %d locks, "
618 "shrunk %d\n", pl->pl_name, nr, cancel);
623 EXPORT_SYMBOL(ldlm_pool_shrink);
626 * Pool setup wrapper. Will call either client or server pool recalc callback
627 * depending what pool \a pl is used.
629 * Sets passed \a limit into pool \a pl.
631 int ldlm_pool_setup(struct ldlm_pool *pl, int limit)
634 if (pl->pl_ops->po_setup != NULL)
635 RETURN(pl->pl_ops->po_setup(pl, limit));
638 EXPORT_SYMBOL(ldlm_pool_setup);
641 static int lprocfs_rd_pool_state(char *page, char **start, off_t off,
642 int count, int *eof, void *data)
644 int granted, grant_rate, cancel_rate, grant_step;
645 int nr = 0, grant_speed, grant_plan, lvf;
646 struct ldlm_pool *pl = data;
650 spin_lock(&pl->pl_lock);
651 slv = pl->pl_server_lock_volume;
652 clv = pl->pl_client_lock_volume;
653 limit = ldlm_pool_get_limit(pl);
654 grant_plan = pl->pl_grant_plan;
655 granted = atomic_read(&pl->pl_granted);
656 grant_rate = atomic_read(&pl->pl_grant_rate);
657 lvf = atomic_read(&pl->pl_lock_volume_factor);
658 grant_speed = atomic_read(&pl->pl_grant_speed);
659 cancel_rate = atomic_read(&pl->pl_cancel_rate);
660 grant_step = ldlm_pool_t2gsp(pl->pl_recalc_period);
661 spin_unlock(&pl->pl_lock);
663 nr += snprintf(page + nr, count - nr, "LDLM pool state (%s):\n",
665 nr += snprintf(page + nr, count - nr, " SLV: "LPU64"\n", slv);
666 nr += snprintf(page + nr, count - nr, " CLV: "LPU64"\n", clv);
667 nr += snprintf(page + nr, count - nr, " LVF: %d\n", lvf);
669 if (ns_is_server(ldlm_pl2ns(pl))) {
670 nr += snprintf(page + nr, count - nr, " GSP: %d%%\n",
672 nr += snprintf(page + nr, count - nr, " GP: %d\n",
675 nr += snprintf(page + nr, count - nr, " GR: %d\n",
677 nr += snprintf(page + nr, count - nr, " CR: %d\n",
679 nr += snprintf(page + nr, count - nr, " GS: %d\n",
681 nr += snprintf(page + nr, count - nr, " G: %d\n",
683 nr += snprintf(page + nr, count - nr, " L: %d\n",
688 LDLM_POOL_PROC_READER(grant_plan, int);
689 LDLM_POOL_PROC_READER(recalc_period, int);
690 LDLM_POOL_PROC_WRITER(recalc_period, int);
692 static int ldlm_pool_proc_init(struct ldlm_pool *pl)
694 struct ldlm_namespace *ns = ldlm_pl2ns(pl);
695 struct proc_dir_entry *parent_ns_proc;
696 struct lprocfs_vars pool_vars[2];
697 char *var_name = NULL;
701 OBD_ALLOC(var_name, MAX_STRING_SIZE + 1);
705 parent_ns_proc = lprocfs_srch(ldlm_ns_proc_dir, ns->ns_name);
706 if (parent_ns_proc == NULL) {
707 CERROR("%s: proc entry is not initialized\n",
709 GOTO(out_free_name, rc = -EINVAL);
711 pl->pl_proc_dir = lprocfs_register("pool", parent_ns_proc,
713 if (IS_ERR(pl->pl_proc_dir)) {
714 CERROR("LProcFS failed in ldlm-pool-init\n");
715 rc = PTR_ERR(pl->pl_proc_dir);
716 GOTO(out_free_name, rc);
719 var_name[MAX_STRING_SIZE] = '\0';
720 memset(pool_vars, 0, sizeof(pool_vars));
721 pool_vars[0].name = var_name;
723 snprintf(var_name, MAX_STRING_SIZE, "server_lock_volume");
724 pool_vars[0].data = &pl->pl_server_lock_volume;
725 pool_vars[0].read_fptr = lprocfs_rd_u64;
726 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
728 snprintf(var_name, MAX_STRING_SIZE, "limit");
729 pool_vars[0].data = &pl->pl_limit;
730 pool_vars[0].read_fptr = lprocfs_rd_atomic;
731 pool_vars[0].write_fptr = lprocfs_wr_atomic;
732 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
734 snprintf(var_name, MAX_STRING_SIZE, "granted");
735 pool_vars[0].data = &pl->pl_granted;
736 pool_vars[0].read_fptr = lprocfs_rd_atomic;
737 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
739 snprintf(var_name, MAX_STRING_SIZE, "grant_speed");
740 pool_vars[0].data = &pl->pl_grant_speed;
741 pool_vars[0].read_fptr = lprocfs_rd_atomic;
742 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
744 snprintf(var_name, MAX_STRING_SIZE, "cancel_rate");
745 pool_vars[0].data = &pl->pl_cancel_rate;
746 pool_vars[0].read_fptr = lprocfs_rd_atomic;
747 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
749 snprintf(var_name, MAX_STRING_SIZE, "grant_rate");
750 pool_vars[0].data = &pl->pl_grant_rate;
751 pool_vars[0].read_fptr = lprocfs_rd_atomic;
752 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
754 snprintf(var_name, MAX_STRING_SIZE, "grant_plan");
755 pool_vars[0].data = pl;
756 pool_vars[0].read_fptr = lprocfs_rd_grant_plan;
757 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
759 snprintf(var_name, MAX_STRING_SIZE, "recalc_period");
760 pool_vars[0].data = pl;
761 pool_vars[0].read_fptr = lprocfs_rd_recalc_period;
762 pool_vars[0].write_fptr = lprocfs_wr_recalc_period;
763 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
765 snprintf(var_name, MAX_STRING_SIZE, "lock_volume_factor");
766 pool_vars[0].data = &pl->pl_lock_volume_factor;
767 pool_vars[0].read_fptr = lprocfs_rd_atomic;
768 pool_vars[0].write_fptr = lprocfs_wr_atomic;
769 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
771 snprintf(var_name, MAX_STRING_SIZE, "state");
772 pool_vars[0].data = pl;
773 pool_vars[0].read_fptr = lprocfs_rd_pool_state;
774 lprocfs_add_vars(pl->pl_proc_dir, pool_vars, 0);
776 pl->pl_stats = lprocfs_alloc_stats(LDLM_POOL_LAST_STAT -
777 LDLM_POOL_FIRST_STAT, 0);
779 GOTO(out_free_name, rc = -ENOMEM);
781 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_GRANTED_STAT,
782 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
784 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_GRANT_STAT,
785 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
787 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_CANCEL_STAT,
788 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
790 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_GRANT_RATE_STAT,
791 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
792 "grant_rate", "locks/s");
793 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_CANCEL_RATE_STAT,
794 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
795 "cancel_rate", "locks/s");
796 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_GRANT_PLAN_STAT,
797 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
798 "grant_plan", "locks/s");
799 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_SLV_STAT,
800 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
802 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_SHRINK_REQTD_STAT,
803 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
804 "shrink_request", "locks");
805 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_SHRINK_FREED_STAT,
806 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
807 "shrink_freed", "locks");
808 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_RECALC_STAT,
809 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
810 "recalc_freed", "locks");
811 lprocfs_counter_init(pl->pl_stats, LDLM_POOL_TIMING_STAT,
812 LPROCFS_CNTR_AVGMINMAX | LPROCFS_CNTR_STDDEV,
813 "recalc_timing", "sec");
814 lprocfs_register_stats(pl->pl_proc_dir, "stats", pl->pl_stats);
818 OBD_FREE(var_name, MAX_STRING_SIZE + 1);
822 static void ldlm_pool_proc_fini(struct ldlm_pool *pl)
824 if (pl->pl_stats != NULL) {
825 lprocfs_free_stats(&pl->pl_stats);
828 if (pl->pl_proc_dir != NULL) {
829 lprocfs_remove(&pl->pl_proc_dir);
830 pl->pl_proc_dir = NULL;
833 #else /* !__KERNEL__*/
834 #define ldlm_pool_proc_init(pl) (0)
835 #define ldlm_pool_proc_fini(pl) while (0) {}
838 int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns,
839 int idx, ldlm_side_t client)
844 spin_lock_init(&pl->pl_lock);
845 atomic_set(&pl->pl_granted, 0);
846 pl->pl_recalc_time = cfs_time_current_sec();
847 atomic_set(&pl->pl_lock_volume_factor, 1);
849 atomic_set(&pl->pl_grant_rate, 0);
850 atomic_set(&pl->pl_cancel_rate, 0);
851 atomic_set(&pl->pl_grant_speed, 0);
852 pl->pl_grant_plan = LDLM_POOL_GP(LDLM_POOL_HOST_L);
854 snprintf(pl->pl_name, sizeof(pl->pl_name), "ldlm-pool-%s-%d",
857 if (client == LDLM_NAMESPACE_SERVER) {
858 pl->pl_ops = &ldlm_srv_pool_ops;
859 ldlm_pool_set_limit(pl, LDLM_POOL_HOST_L);
860 pl->pl_recalc_period = LDLM_POOL_SRV_DEF_RECALC_PERIOD;
861 pl->pl_server_lock_volume = ldlm_pool_slv_max(LDLM_POOL_HOST_L);
863 ldlm_pool_set_limit(pl, 1);
864 pl->pl_server_lock_volume = 1;
865 pl->pl_ops = &ldlm_cli_pool_ops;
866 pl->pl_recalc_period = LDLM_POOL_CLI_DEF_RECALC_PERIOD;
868 pl->pl_client_lock_volume = 0;
869 rc = ldlm_pool_proc_init(pl);
873 CDEBUG(D_DLMTRACE, "Lock pool %s is initialized\n", pl->pl_name);
877 EXPORT_SYMBOL(ldlm_pool_init);
879 void ldlm_pool_fini(struct ldlm_pool *pl)
882 ldlm_pool_proc_fini(pl);
885 * Pool should not be used after this point. We can't free it here as
886 * it lives in struct ldlm_namespace, but still interested in catching
887 * any abnormal using cases.
889 POISON(pl, 0x5a, sizeof(*pl));
892 EXPORT_SYMBOL(ldlm_pool_fini);
895 * Add new taken ldlm lock \a lock into pool \a pl accounting.
897 void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock)
900 * FLOCK locks are special in a sense that they are almost never
901 * cancelled, instead special kind of lock is used to drop them.
902 * also there is no LRU for flock locks, so no point in tracking
905 if (lock->l_resource->lr_type == LDLM_FLOCK)
909 LDLM_DEBUG(lock, "add lock to pool");
910 atomic_inc(&pl->pl_granted);
911 atomic_inc(&pl->pl_grant_rate);
912 atomic_inc(&pl->pl_grant_speed);
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);
925 EXPORT_SYMBOL(ldlm_pool_add);
928 * Remove ldlm lock \a lock from pool \a pl accounting.
930 void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock)
933 * Filter out FLOCK locks. Read above comment in ldlm_pool_add().
935 if (lock->l_resource->lr_type == LDLM_FLOCK)
939 LDLM_DEBUG(lock, "del lock from pool");
940 LASSERT(atomic_read(&pl->pl_granted) > 0);
941 atomic_dec(&pl->pl_granted);
942 atomic_inc(&pl->pl_cancel_rate);
943 atomic_dec(&pl->pl_grant_speed);
945 lprocfs_counter_incr(pl->pl_stats, LDLM_POOL_CANCEL_STAT);
947 if (ns_is_server(ldlm_pl2ns(pl)))
948 ldlm_pool_recalc(pl);
951 EXPORT_SYMBOL(ldlm_pool_del);
954 * Returns current \a pl SLV.
956 * \pre ->pl_lock is not locked.
958 __u64 ldlm_pool_get_slv(struct ldlm_pool *pl)
961 spin_lock(&pl->pl_lock);
962 slv = pl->pl_server_lock_volume;
963 spin_unlock(&pl->pl_lock);
966 EXPORT_SYMBOL(ldlm_pool_get_slv);
969 * Sets passed \a slv to \a pl.
971 * \pre ->pl_lock is not locked.
973 void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv)
975 spin_lock(&pl->pl_lock);
976 pl->pl_server_lock_volume = slv;
977 spin_unlock(&pl->pl_lock);
979 EXPORT_SYMBOL(ldlm_pool_set_slv);
982 * Returns current \a pl CLV.
984 * \pre ->pl_lock is not locked.
986 __u64 ldlm_pool_get_clv(struct ldlm_pool *pl)
989 spin_lock(&pl->pl_lock);
990 slv = pl->pl_client_lock_volume;
991 spin_unlock(&pl->pl_lock);
994 EXPORT_SYMBOL(ldlm_pool_get_clv);
997 * Sets passed \a clv to \a pl.
999 * \pre ->pl_lock is not locked.
1001 void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv)
1003 spin_lock(&pl->pl_lock);
1004 pl->pl_client_lock_volume = clv;
1005 spin_unlock(&pl->pl_lock);
1007 EXPORT_SYMBOL(ldlm_pool_set_clv);
1010 * Returns current \a pl limit.
1012 __u32 ldlm_pool_get_limit(struct ldlm_pool *pl)
1014 return atomic_read(&pl->pl_limit);
1016 EXPORT_SYMBOL(ldlm_pool_get_limit);
1019 * Sets passed \a limit to \a pl.
1021 void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit)
1023 atomic_set(&pl->pl_limit, limit);
1025 EXPORT_SYMBOL(ldlm_pool_set_limit);
1028 * Returns current LVF from \a pl.
1030 __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl)
1032 return atomic_read(&pl->pl_lock_volume_factor);
1034 EXPORT_SYMBOL(ldlm_pool_get_lvf);
1037 static int ldlm_pool_granted(struct ldlm_pool *pl)
1039 return atomic_read(&pl->pl_granted);
1042 static struct ptlrpc_thread *ldlm_pools_thread;
1043 static struct shrinker *ldlm_pools_srv_shrinker;
1044 static struct shrinker *ldlm_pools_cli_shrinker;
1045 static struct completion ldlm_pools_comp;
1048 * Cancel \a nr locks from all namespaces (if possible). Returns number of
1049 * cached locks after shrink is finished. All namespaces are asked to
1050 * cancel approximately equal amount of locks to keep balancing.
1052 static int ldlm_pools_shrink(ldlm_side_t client, int nr,
1053 unsigned int gfp_mask)
1055 int total = 0, cached = 0, nr_ns;
1056 struct ldlm_namespace *ns;
1059 if (nr != 0 && !(gfp_mask & __GFP_FS))
1062 CDEBUG(D_DLMTRACE, "Request to shrink %d %s locks from all pools\n",
1063 nr, client == LDLM_NAMESPACE_CLIENT ? "client" : "server");
1065 cookie = cl_env_reenter();
1068 * Find out how many resources we may release.
1070 for (nr_ns = atomic_read(ldlm_namespace_nr(client));
1073 mutex_down(ldlm_namespace_lock(client));
1074 if (list_empty(ldlm_namespace_list(client))) {
1075 mutex_up(ldlm_namespace_lock(client));
1076 cl_env_reexit(cookie);
1079 ns = ldlm_namespace_first_locked(client);
1080 ldlm_namespace_get(ns);
1081 ldlm_namespace_move_locked(ns, client);
1082 mutex_up(ldlm_namespace_lock(client));
1083 total += ldlm_pool_shrink(&ns->ns_pool, 0, gfp_mask);
1084 ldlm_namespace_put(ns, 1);
1087 if (nr == 0 || total == 0) {
1088 cl_env_reexit(cookie);
1093 * Shrink at least ldlm_namespace_nr(client) namespaces.
1095 for (nr_ns = atomic_read(ldlm_namespace_nr(client));
1098 int cancel, nr_locks;
1101 * Do not call shrink under ldlm_namespace_lock(client)
1103 mutex_down(ldlm_namespace_lock(client));
1104 if (list_empty(ldlm_namespace_list(client))) {
1105 mutex_up(ldlm_namespace_lock(client));
1107 * If list is empty, we can't return any @cached > 0,
1108 * that probably would cause needless shrinker
1114 ns = ldlm_namespace_first_locked(client);
1115 ldlm_namespace_get(ns);
1116 ldlm_namespace_move_locked(ns, client);
1117 mutex_up(ldlm_namespace_lock(client));
1119 nr_locks = ldlm_pool_granted(&ns->ns_pool);
1120 cancel = 1 + nr_locks * nr / total;
1121 ldlm_pool_shrink(&ns->ns_pool, cancel, gfp_mask);
1122 cached += ldlm_pool_granted(&ns->ns_pool);
1123 ldlm_namespace_put(ns, 1);
1125 cl_env_reexit(cookie);
1129 static int ldlm_pools_srv_shrink(int nr, unsigned int gfp_mask)
1131 return ldlm_pools_shrink(LDLM_NAMESPACE_SERVER, nr, gfp_mask);
1134 static int ldlm_pools_cli_shrink(int nr, unsigned int gfp_mask)
1136 return ldlm_pools_shrink(LDLM_NAMESPACE_CLIENT, nr, gfp_mask);
1139 void ldlm_pools_recalc(ldlm_side_t client)
1141 __u32 nr_l = 0, nr_p = 0, l;
1142 struct ldlm_namespace *ns;
1146 * No need to setup pool limit for client pools.
1148 if (client == LDLM_NAMESPACE_SERVER) {
1150 * Check all modest namespaces first.
1152 mutex_down(ldlm_namespace_lock(client));
1153 list_for_each_entry(ns, ldlm_namespace_list(client),
1156 if (ns->ns_appetite != LDLM_NAMESPACE_MODEST)
1159 l = ldlm_pool_granted(&ns->ns_pool);
1164 * Set the modest pools limit equal to their avg granted
1167 l += dru(l * LDLM_POOLS_MODEST_MARGIN, 100);
1168 ldlm_pool_setup(&ns->ns_pool, l);
1174 * Make sure that modest namespaces did not eat more that 2/3
1177 if (nr_l >= 2 * (LDLM_POOL_HOST_L / 3)) {
1178 CWARN("\"Modest\" pools eat out 2/3 of server locks "
1179 "limit (%d of %lu). This means that you have too "
1180 "many clients for this amount of server RAM. "
1181 "Upgrade server!\n", nr_l, LDLM_POOL_HOST_L);
1186 * The rest is given to greedy namespaces.
1188 list_for_each_entry(ns, ldlm_namespace_list(client),
1191 if (!equal && ns->ns_appetite != LDLM_NAMESPACE_GREEDY)
1196 * In the case 2/3 locks are eaten out by
1197 * modest pools, we re-setup equal limit
1200 l = LDLM_POOL_HOST_L /
1201 atomic_read(ldlm_namespace_nr(client));
1204 * All the rest of greedy pools will have
1205 * all locks in equal parts.
1207 l = (LDLM_POOL_HOST_L - nr_l) /
1208 (atomic_read(ldlm_namespace_nr(client)) -
1211 ldlm_pool_setup(&ns->ns_pool, l);
1213 mutex_up(ldlm_namespace_lock(client));
1217 * Recalc at least ldlm_namespace_nr(client) namespaces.
1219 for (nr = atomic_read(ldlm_namespace_nr(client)); nr > 0; nr--) {
1221 * Lock the list, get first @ns in the list, getref, move it
1222 * to the tail, unlock and call pool recalc. This way we avoid
1223 * calling recalc under @ns lock what is really good as we get
1224 * rid of potential deadlock on client nodes when canceling
1225 * locks synchronously.
1227 mutex_down(ldlm_namespace_lock(client));
1228 if (list_empty(ldlm_namespace_list(client))) {
1229 mutex_up(ldlm_namespace_lock(client));
1232 ns = ldlm_namespace_first_locked(client);
1233 ldlm_namespace_get(ns);
1234 ldlm_namespace_move_locked(ns, client);
1235 mutex_up(ldlm_namespace_lock(client));
1238 * After setup is done - recalc the pool.
1240 ldlm_pool_recalc(&ns->ns_pool);
1241 ldlm_namespace_put(ns, 1);
1244 EXPORT_SYMBOL(ldlm_pools_recalc);
1246 static int ldlm_pools_thread_main(void *arg)
1248 struct ptlrpc_thread *thread = (struct ptlrpc_thread *)arg;
1249 char *t_name = "ldlm_poold";
1252 cfs_daemonize(t_name);
1253 thread->t_flags = SVC_RUNNING;
1254 cfs_waitq_signal(&thread->t_ctl_waitq);
1256 CDEBUG(D_DLMTRACE, "%s: pool thread starting, process %d\n",
1257 t_name, cfs_curproc_pid());
1260 struct l_wait_info lwi;
1263 * Recal all pools on this tick.
1265 ldlm_pools_recalc(LDLM_NAMESPACE_SERVER);
1266 ldlm_pools_recalc(LDLM_NAMESPACE_CLIENT);
1269 * Wait until the next check time, or until we're
1272 lwi = LWI_TIMEOUT(cfs_time_seconds(LDLM_POOLS_THREAD_PERIOD),
1274 l_wait_event(thread->t_ctl_waitq, (thread->t_flags &
1275 (SVC_STOPPING|SVC_EVENT)),
1278 if (thread->t_flags & SVC_STOPPING) {
1279 thread->t_flags &= ~SVC_STOPPING;
1281 } else if (thread->t_flags & SVC_EVENT) {
1282 thread->t_flags &= ~SVC_EVENT;
1286 thread->t_flags = SVC_STOPPED;
1287 cfs_waitq_signal(&thread->t_ctl_waitq);
1289 CDEBUG(D_DLMTRACE, "%s: pool thread exiting, process %d\n",
1290 t_name, cfs_curproc_pid());
1292 complete_and_exit(&ldlm_pools_comp, 0);
1295 static int ldlm_pools_thread_start(void)
1297 struct l_wait_info lwi = { 0 };
1301 if (ldlm_pools_thread != NULL)
1304 OBD_ALLOC_PTR(ldlm_pools_thread);
1305 if (ldlm_pools_thread == NULL)
1308 init_completion(&ldlm_pools_comp);
1309 cfs_waitq_init(&ldlm_pools_thread->t_ctl_waitq);
1312 * CLONE_VM and CLONE_FILES just avoid a needless copy, because we
1313 * just drop the VM and FILES in ptlrpc_daemonize() right away.
1315 rc = cfs_kernel_thread(ldlm_pools_thread_main, ldlm_pools_thread,
1316 CLONE_VM | CLONE_FILES);
1318 CERROR("Can't start pool thread, error %d\n",
1320 OBD_FREE(ldlm_pools_thread, sizeof(*ldlm_pools_thread));
1321 ldlm_pools_thread = NULL;
1324 l_wait_event(ldlm_pools_thread->t_ctl_waitq,
1325 (ldlm_pools_thread->t_flags & SVC_RUNNING), &lwi);
1329 static void ldlm_pools_thread_stop(void)
1333 if (ldlm_pools_thread == NULL) {
1338 ldlm_pools_thread->t_flags = SVC_STOPPING;
1339 cfs_waitq_signal(&ldlm_pools_thread->t_ctl_waitq);
1342 * Make sure that pools thread is finished before freeing @thread.
1343 * This fixes possible race and oops due to accessing freed memory
1346 wait_for_completion(&ldlm_pools_comp);
1347 OBD_FREE_PTR(ldlm_pools_thread);
1348 ldlm_pools_thread = NULL;
1352 int ldlm_pools_init(void)
1357 rc = ldlm_pools_thread_start();
1359 ldlm_pools_srv_shrinker = set_shrinker(DEFAULT_SEEKS,
1360 ldlm_pools_srv_shrink);
1361 ldlm_pools_cli_shrinker = set_shrinker(DEFAULT_SEEKS,
1362 ldlm_pools_cli_shrink);
1366 EXPORT_SYMBOL(ldlm_pools_init);
1368 void ldlm_pools_fini(void)
1370 if (ldlm_pools_srv_shrinker != NULL) {
1371 remove_shrinker(ldlm_pools_srv_shrinker);
1372 ldlm_pools_srv_shrinker = NULL;
1374 if (ldlm_pools_cli_shrinker != NULL) {
1375 remove_shrinker(ldlm_pools_cli_shrinker);
1376 ldlm_pools_cli_shrinker = NULL;
1378 ldlm_pools_thread_stop();
1380 EXPORT_SYMBOL(ldlm_pools_fini);
1381 #endif /* __KERNEL__ */
1383 #else /* !HAVE_LRU_RESIZE_SUPPORT */
1384 int ldlm_pool_setup(struct ldlm_pool *pl, int limit)
1388 EXPORT_SYMBOL(ldlm_pool_setup);
1390 int ldlm_pool_recalc(struct ldlm_pool *pl)
1394 EXPORT_SYMBOL(ldlm_pool_recalc);
1396 int ldlm_pool_shrink(struct ldlm_pool *pl,
1397 int nr, unsigned int gfp_mask)
1401 EXPORT_SYMBOL(ldlm_pool_shrink);
1403 int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns,
1404 int idx, ldlm_side_t client)
1408 EXPORT_SYMBOL(ldlm_pool_init);
1410 void ldlm_pool_fini(struct ldlm_pool *pl)
1414 EXPORT_SYMBOL(ldlm_pool_fini);
1416 void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock)
1420 EXPORT_SYMBOL(ldlm_pool_add);
1422 void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock)
1426 EXPORT_SYMBOL(ldlm_pool_del);
1428 __u64 ldlm_pool_get_slv(struct ldlm_pool *pl)
1432 EXPORT_SYMBOL(ldlm_pool_get_slv);
1434 void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv)
1438 EXPORT_SYMBOL(ldlm_pool_set_slv);
1440 __u64 ldlm_pool_get_clv(struct ldlm_pool *pl)
1444 EXPORT_SYMBOL(ldlm_pool_get_clv);
1446 void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv)
1450 EXPORT_SYMBOL(ldlm_pool_set_clv);
1452 __u32 ldlm_pool_get_limit(struct ldlm_pool *pl)
1456 EXPORT_SYMBOL(ldlm_pool_get_limit);
1458 void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit)
1462 EXPORT_SYMBOL(ldlm_pool_set_limit);
1464 __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl)
1468 EXPORT_SYMBOL(ldlm_pool_get_lvf);
1470 int ldlm_pools_init(void)
1474 EXPORT_SYMBOL(ldlm_pools_init);
1476 void ldlm_pools_fini(void)
1480 EXPORT_SYMBOL(ldlm_pools_fini);
1482 void ldlm_pools_recalc(ldlm_side_t client)
1486 EXPORT_SYMBOL(ldlm_pools_recalc);
1487 #endif /* HAVE_LRU_RESIZE_SUPPORT */