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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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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/
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33 * lustre/obdclass/lprocfs_counters.c
35 * Lustre lprocfs counter routines
37 * Author: Andreas Dilger <andreas.dilger@intel.com>
39 #include <linux/module.h>
40 #include <lustre_lib.h>
41 #include <lprocfs_status.h>
44 void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
46 struct lprocfs_counter *percpu_cntr;
47 struct lprocfs_counter_header *header;
49 unsigned long flags = 0;
54 LASSERTF(0 <= idx && idx < stats->ls_num,
55 "idx %d, ls_num %hu\n", idx, stats->ls_num);
57 /* With per-client stats, statistics are allocated only for
58 * single CPU area, so the smp_id should be 0 always. */
59 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
63 header = &stats->ls_cnt_header[idx];
64 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
65 percpu_cntr->lc_count++;
67 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
69 * lprocfs_counter_add() can be called in interrupt context,
70 * as memory allocation could trigger memory shrinker call
71 * ldlm_pool_shrink(), which calls lprocfs_counter_add().
74 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
75 * flag, because it needs accurate counting lest memory leak
76 * check reports error.
79 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
80 percpu_cntr->lc_sum_irq += amount;
82 percpu_cntr->lc_sum += amount;
84 if (header->lc_config & LPROCFS_CNTR_STDDEV)
85 percpu_cntr->lc_sumsquare += (__s64)amount * amount;
86 if (amount < percpu_cntr->lc_min)
87 percpu_cntr->lc_min = amount;
88 if (amount > percpu_cntr->lc_max)
89 percpu_cntr->lc_max = amount;
91 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
93 EXPORT_SYMBOL(lprocfs_counter_add);
95 void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
97 struct lprocfs_counter *percpu_cntr;
98 struct lprocfs_counter_header *header;
100 unsigned long flags = 0;
105 LASSERTF(0 <= idx && idx < stats->ls_num,
106 "idx %d, ls_num %hu\n", idx, stats->ls_num);
108 /* With per-client stats, statistics are allocated only for
109 * 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.
124 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
125 * flag, because it needs accurate counting lest memory leak
126 * check reports error.
128 if (in_interrupt() &&
129 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
130 percpu_cntr->lc_sum_irq -= amount;
132 percpu_cntr->lc_sum -= amount;
134 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
136 EXPORT_SYMBOL(lprocfs_counter_sub);