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
19 * http://www.gnu.org/licenses/gpl-2.0.html
24 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
25 * Use is subject to license terms.
27 * Copyright (c) 2012, 2013, Intel Corporation.
30 * This file is part of Lustre, http://www.lustre.org/
31 * Lustre is a trademark of Sun Microsystems, Inc.
33 * lustre/obdclass/lprocfs_counters.c
35 * Lustre lprocfs counter routines
37 * Author: Andreas Dilger <andreas.dilger@intel.com>
40 #include <linux/module.h>
42 #include <liblustre.h>
44 #include <lustre_lib.h>
45 #include <lprocfs_status.h>
48 void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
50 struct lprocfs_counter *percpu_cntr;
51 struct lprocfs_counter_header *header;
53 unsigned long flags = 0;
58 LASSERTF(0 <= idx && idx < stats->ls_num,
59 "idx %d, ls_num %hu\n", idx, stats->ls_num);
61 /* With per-client stats, statistics are allocated only for
62 * single CPU area, so the smp_id should be 0 always. */
63 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
67 header = &stats->ls_cnt_header[idx];
68 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
69 percpu_cntr->lc_count++;
71 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
73 * lprocfs_counter_add() can be called in interrupt context,
74 * as memory allocation could trigger memory shrinker call
75 * ldlm_pool_shrink(), which calls lprocfs_counter_add().
78 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
79 * flag, because it needs accurate counting lest memory leak
80 * check reports error.
83 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
84 percpu_cntr->lc_sum_irq += amount;
86 percpu_cntr->lc_sum += amount;
88 if (header->lc_config & LPROCFS_CNTR_STDDEV)
89 percpu_cntr->lc_sumsquare += (__s64)amount * amount;
90 if (amount < percpu_cntr->lc_min)
91 percpu_cntr->lc_min = amount;
92 if (amount > percpu_cntr->lc_max)
93 percpu_cntr->lc_max = amount;
95 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
97 EXPORT_SYMBOL(lprocfs_counter_add);
99 void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
101 struct lprocfs_counter *percpu_cntr;
102 struct lprocfs_counter_header *header;
104 unsigned long flags = 0;
109 LASSERTF(0 <= idx && idx < stats->ls_num,
110 "idx %d, ls_num %hu\n", idx, stats->ls_num);
112 /* With per-client stats, statistics are allocated only for
113 * single CPU area, so the smp_id should be 0 always. */
114 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
118 header = &stats->ls_cnt_header[idx];
119 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
120 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
122 * Sometimes we use RCU callbacks to free memory which calls
123 * lprocfs_counter_sub(), and RCU callbacks may execute in
124 * softirq context - right now that's the only case we're in
125 * softirq context here, use separate counter for that.
128 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
129 * flag, because it needs accurate counting lest memory leak
130 * check reports error.
132 if (in_interrupt() &&
133 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
134 percpu_cntr->lc_sum_irq -= amount;
136 percpu_cntr->lc_sum -= amount;
138 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
140 EXPORT_SYMBOL(lprocfs_counter_sub);