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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/
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33 * lustre/obdclass/lprocfs_counters.c
35 * Lustre lprocfs counter routines
37 * Author: Andreas Dilger <andreas.dilger@intel.com>
40 #include <linux/module.h>
41 #include "../include/lprocfs_status.h"
42 #include "../include/obd_support.h"
44 struct lprocfs_stats *obd_memory = NULL;
45 EXPORT_SYMBOL(obd_memory);
47 void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
49 struct lprocfs_counter *percpu_cntr;
50 struct lprocfs_counter_header *header;
52 unsigned long flags = 0;
57 LASSERTF(0 <= idx && idx < stats->ls_num,
58 "idx %d, ls_num %hu\n", idx, stats->ls_num);
60 /* With per-client stats, statistics are allocated only for
61 * single CPU area, so the smp_id should be 0 always. */
62 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
66 header = &stats->ls_cnt_header[idx];
67 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
68 percpu_cntr->lc_count++;
70 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
72 * lprocfs_counter_add() can be called in interrupt context,
73 * as memory allocation could trigger memory shrinker call
74 * ldlm_pool_shrink(), which calls lprocfs_counter_add().
77 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
78 * flag, because it needs accurate counting lest memory leak
79 * check reports error.
82 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
83 percpu_cntr->lc_sum_irq += amount;
85 percpu_cntr->lc_sum += amount;
87 if (header->lc_config & LPROCFS_CNTR_STDDEV)
88 percpu_cntr->lc_sumsquare += (__s64)amount * amount;
89 if (amount < percpu_cntr->lc_min)
90 percpu_cntr->lc_min = amount;
91 if (amount > percpu_cntr->lc_max)
92 percpu_cntr->lc_max = amount;
94 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
96 EXPORT_SYMBOL(lprocfs_counter_add);
98 void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
100 struct lprocfs_counter *percpu_cntr;
101 struct lprocfs_counter_header *header;
103 unsigned long flags = 0;
108 LASSERTF(0 <= idx && idx < stats->ls_num,
109 "idx %d, ls_num %hu\n", idx, stats->ls_num);
111 /* With per-client stats, statistics are allocated only for
112 * single CPU area, so the smp_id should be 0 always. */
113 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
117 header = &stats->ls_cnt_header[idx];
118 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
119 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
121 * Sometimes we use RCU callbacks to free memory which calls
122 * lprocfs_counter_sub(), and RCU callbacks may execute in
123 * softirq context - right now that's the only case we're in
124 * softirq context here, use separate counter for that.
127 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
128 * flag, because it needs accurate counting lest memory leak
129 * check reports error.
131 if (in_interrupt() &&
132 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
133 percpu_cntr->lc_sum_irq -= amount;
135 percpu_cntr->lc_sum -= amount;
137 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
139 EXPORT_SYMBOL(lprocfs_counter_sub);