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) 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/lvfs/lvfs_lib.c
38 * Lustre filesystem abstraction routines
40 * Author: Andreas Dilger <adilger@clusterfs.com>
43 #include <linux/module.h>
45 #include <liblustre.h>
47 #include <lustre_lib.h>
48 #include <lprocfs_status.h>
50 unsigned int obd_alloc_fail_rate = 0;
52 int obd_alloc_fail(const void *ptr, const char *name, const char *type,
53 size_t size, const char *file, int line)
56 (cfs_rand() & OBD_ALLOC_FAIL_MASK) < obd_alloc_fail_rate) {
57 CERROR("%s%salloc of %s ("LPU64" bytes) failed at %s:%d\n",
58 ptr ? "force " :"", type, name, (__u64)size, file,
60 CERROR(LPU64" total bytes and "LPU64" total pages "
61 "("LPU64" bytes) allocated by Lustre, "
62 "%d total bytes by LNET\n",
64 obd_pages_sum() << CFS_PAGE_SHIFT,
66 cfs_atomic_read(&libcfs_kmemory));
71 EXPORT_SYMBOL(obd_alloc_fail);
74 void lprocfs_counter_add(struct lprocfs_stats *stats, int idx,
77 struct lprocfs_counter *percpu_cntr;
79 unsigned long flags = 0;
84 /* With per-client stats, statistics are allocated only for
85 * single CPU area, so the smp_id should be 0 always. */
86 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
90 percpu_cntr = &(stats->ls_percpu[smp_id]->lp_cntr[idx]);
91 percpu_cntr->lc_count++;
92 if (percpu_cntr->lc_config & LPROCFS_CNTR_AVGMINMAX) {
94 * lprocfs_counter_add() can be called in interrupt context,
95 * as memory allocation could trigger memory shrinker call
96 * ldlm_pool_shrink(), which calls lprocfs_counter_add().
99 if (cfs_in_interrupt())
100 percpu_cntr->lc_sum_irq += amount;
102 percpu_cntr->lc_sum += amount;
103 if (percpu_cntr->lc_config & LPROCFS_CNTR_STDDEV)
104 percpu_cntr->lc_sumsquare += (__s64)amount * amount;
105 if (amount < percpu_cntr->lc_min)
106 percpu_cntr->lc_min = amount;
107 if (amount > percpu_cntr->lc_max)
108 percpu_cntr->lc_max = amount;
110 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
112 EXPORT_SYMBOL(lprocfs_counter_add);
114 void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
116 struct lprocfs_counter *percpu_cntr;
118 unsigned long flags = 0;
123 /* With per-client stats, statistics are allocated only for
124 * single CPU area, so the smp_id should be 0 always. */
125 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
129 percpu_cntr = &(stats->ls_percpu[smp_id]->lp_cntr[idx]);
130 if (percpu_cntr->lc_config & LPROCFS_CNTR_AVGMINMAX) {
132 * Sometimes we use RCU callbacks to free memory which calls
133 * lprocfs_counter_sub(), and RCU callbacks may execute in
134 * softirq context - right now that's the only case we're in
135 * softirq context here, use separate counter for that.
138 if (cfs_in_interrupt())
139 percpu_cntr->lc_sum_irq -= amount;
141 percpu_cntr->lc_sum -= amount;
143 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
145 EXPORT_SYMBOL(lprocfs_counter_sub);
147 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int idx)
149 unsigned int percpusize;
151 unsigned long flags = 0;
153 /* the 1st percpu entry was statically allocated in
154 * lprocfs_alloc_stats() */
155 LASSERT(idx != 0 && stats->ls_percpu[0] != NULL);
156 LASSERT(stats->ls_percpu[idx] == NULL);
157 LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
159 percpusize = CFS_L1_CACHE_ALIGN(offsetof(struct lprocfs_percpu,
160 lp_cntr[stats->ls_num]));
161 OBD_ALLOC_GFP(stats->ls_percpu[idx], percpusize, CFS_ALLOC_ATOMIC);
162 if (stats->ls_percpu[idx] != NULL) {
164 if (unlikely(stats->ls_biggest_alloc_num <= idx)) {
165 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
166 spin_lock_irqsave(&stats->ls_lock, flags);
168 spin_lock(&stats->ls_lock);
169 if (stats->ls_biggest_alloc_num <= idx)
170 stats->ls_biggest_alloc_num = idx + 1;
171 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) {
172 spin_unlock_irqrestore(&stats->ls_lock, flags);
174 spin_unlock(&stats->ls_lock);
178 /* initialize the ls_percpu[idx] by copying the 0th template
180 memcpy(stats->ls_percpu[idx], stats->ls_percpu[0],
186 EXPORT_SYMBOL(lprocfs_stats_alloc_one);
189 EXPORT_SYMBOL(obd_alloc_fail_rate);