1 // SPDX-License-Identifier: GPL-2.0
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 only,
9 * as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License version 2 for more details (a copy is included
15 * in the LICENSE file that accompanied this code).
17 * You should have received a copy of the GNU General Public License
18 * version 2 along with this program; If not, see
20 * http://www.gnu.org/licenses/gpl-2.0.html
25 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
26 * Use is subject to license terms.
28 * Copyright (c) 2012, 2013, Intel Corporation.
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
34 * lustre/obdclass/lprocfs_counters.c
36 * Lustre lprocfs counter routines
38 * Author: Andreas Dilger <andreas.dilger@intel.com>
41 #include <linux/module.h>
42 #include <lprocfs_status.h>
43 #include <obd_support.h>
45 void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
47 struct lprocfs_counter *percpu_cntr;
48 struct lprocfs_counter_header *header;
50 unsigned long flags = 0;
55 LASSERTF(0 <= idx && idx < stats->ls_num,
56 "idx %d, ls_num %hu\n", idx, stats->ls_num);
58 /* With per-client stats, statistics are allocated only for
59 * single CPU area, so the smp_id should be 0 always.
61 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
65 header = &stats->ls_cnt_header[idx];
66 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
67 percpu_cntr->lc_count++;
69 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
71 * lprocfs_counter_add() can be called in interrupt context,
72 * as memory allocation could trigger memory shrinker call
73 * ldlm_pool_shrink(), which calls lprocfs_counter_add().
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 LASSERTF(0 <= idx && idx < stats->ls_num,
105 "idx %d, ls_num %hu\n", idx, stats->ls_num);
107 /* With per-client stats, statistics are allocated only for
108 * single CPU area, so the smp_id should be 0 always.
110 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
114 header = &stats->ls_cnt_header[idx];
115 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
116 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
118 * Sometimes we use RCU callbacks to free memory which calls
119 * lprocfs_counter_sub(), and RCU callbacks may execute in
120 * softirq context - right now that's the only case we're in
121 * softirq context here, use separate counter for that.
125 if (in_interrupt() &&
126 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
127 percpu_cntr->lc_sum_irq -= amount;
129 percpu_cntr->lc_sum -= amount;
131 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
133 EXPORT_SYMBOL(lprocfs_counter_sub);