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>
42 #include <linux/module.h>
43 #include "../include/lustre_lib.h"
44 #include "../include/lprocfs_status.h"
46 void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
48 struct lprocfs_counter *percpu_cntr;
49 struct lprocfs_counter_header *header;
51 unsigned long flags = 0;
56 /* With per-client stats, statistics are allocated only for
57 * single CPU area, so the smp_id should be 0 always. */
58 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
62 header = &stats->ls_cnt_header[idx];
63 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
64 percpu_cntr->lc_count++;
66 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
68 * lprocfs_counter_add() can be called in interrupt context,
69 * as memory allocation could trigger memory shrinker call
70 * ldlm_pool_shrink(), which calls lprocfs_counter_add().
73 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
74 * flag, because it needs accurate counting lest memory leak
75 * check reports error.
78 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
79 percpu_cntr->lc_sum_irq += amount;
81 percpu_cntr->lc_sum += amount;
83 if (header->lc_config & LPROCFS_CNTR_STDDEV)
84 percpu_cntr->lc_sumsquare += (__s64)amount * amount;
85 if (amount < percpu_cntr->lc_min)
86 percpu_cntr->lc_min = amount;
87 if (amount > percpu_cntr->lc_max)
88 percpu_cntr->lc_max = amount;
90 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
92 EXPORT_SYMBOL(lprocfs_counter_add);
94 void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
96 struct lprocfs_counter *percpu_cntr;
97 struct lprocfs_counter_header *header;
99 unsigned long flags = 0;
104 /* With per-client stats, statistics are allocated only for
105 * single CPU area, so the smp_id should be 0 always. */
106 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
110 header = &stats->ls_cnt_header[idx];
111 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
112 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
114 * Sometimes we use RCU callbacks to free memory which calls
115 * lprocfs_counter_sub(), and RCU callbacks may execute in
116 * softirq context - right now that's the only case we're in
117 * softirq context here, use separate counter for that.
120 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
121 * flag, because it needs accurate counting lest memory leak
122 * check reports error.
124 if (in_interrupt() &&
125 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
126 percpu_cntr->lc_sum_irq -= amount;
128 percpu_cntr->lc_sum -= amount;
130 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
132 EXPORT_SYMBOL(lprocfs_counter_sub);
134 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
136 struct lprocfs_counter *cntr;
137 unsigned int percpusize;
139 unsigned long flags = 0;
142 LASSERT(stats->ls_percpu[cpuid] == NULL);
143 LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
145 percpusize = lprocfs_stats_counter_size(stats);
146 LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
147 if (stats->ls_percpu[cpuid] != NULL) {
149 if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
150 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
151 spin_lock_irqsave(&stats->ls_lock, flags);
153 spin_lock(&stats->ls_lock);
154 if (stats->ls_biggest_alloc_num <= cpuid)
155 stats->ls_biggest_alloc_num = cpuid + 1;
156 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
157 spin_unlock_irqrestore(&stats->ls_lock, flags);
159 spin_unlock(&stats->ls_lock);
161 /* initialize the ls_percpu[cpuid] non-zero counter */
162 for (i = 0; i < stats->ls_num; ++i) {
163 cntr = lprocfs_stats_counter_get(stats, cpuid, i);
164 cntr->lc_min = LC_MIN_INIT;
170 EXPORT_SYMBOL(lprocfs_stats_alloc_one);