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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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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/
32 * lustre/obdclass/lprocfs_counters.c
34 * Lustre lprocfs counter routines
36 * Author: Andreas Dilger <andreas.dilger@intel.com>
38 #include <linux/module.h>
39 #include <lustre_lib.h>
40 #include <lprocfs_status.h>
43 void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
45 struct lprocfs_counter *percpu_cntr;
46 struct lprocfs_counter_header *header;
48 unsigned long flags = 0;
53 LASSERTF(0 <= idx && idx < stats->ls_num,
54 "idx %d, ls_num %hu\n", idx, stats->ls_num);
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 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. */
109 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
113 header = &stats->ls_cnt_header[idx];
114 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
115 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
117 * Sometimes we use RCU callbacks to free memory which calls
118 * lprocfs_counter_sub(), and RCU callbacks may execute in
119 * softirq context - right now that's the only case we're in
120 * softirq context here, use separate counter for that.
123 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
124 * flag, because it needs accurate counting lest memory leak
125 * check reports error.
127 if (in_interrupt() &&
128 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
129 percpu_cntr->lc_sum_irq -= amount;
131 percpu_cntr->lc_sum -= amount;
133 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
135 EXPORT_SYMBOL(lprocfs_counter_sub);
136 #endif /* CONFIG_PROC_FS */