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24 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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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;
49 struct obd_histogram *hist;
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 /* no counter in interrupt has historgram for now */
92 hist = stats->ls_cnt_header[idx].lc_hist;
96 if (likely(amount != 0))
97 val = min(fls(amount - 1), OBD_HIST_MAX - 1);
98 spin_lock(&hist->oh_lock);
99 hist->oh_buckets[val]++;
100 spin_unlock(&hist->oh_lock);
103 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
105 EXPORT_SYMBOL(lprocfs_counter_add);
107 void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
109 struct lprocfs_counter *percpu_cntr;
110 struct lprocfs_counter_header *header;
112 unsigned long flags = 0;
117 LASSERTF(0 <= idx && idx < stats->ls_num,
118 "idx %d, ls_num %hu\n", idx, stats->ls_num);
120 /* With per-client stats, statistics are allocated only for
121 * single CPU area, so the smp_id should be 0 always. */
122 smp_id = lprocfs_stats_lock(stats, LPROCFS_GET_SMP_ID, &flags);
126 header = &stats->ls_cnt_header[idx];
127 percpu_cntr = lprocfs_stats_counter_get(stats, smp_id, idx);
128 if (header->lc_config & LPROCFS_CNTR_AVGMINMAX) {
130 * Sometimes we use RCU callbacks to free memory which calls
131 * lprocfs_counter_sub(), and RCU callbacks may execute in
132 * softirq context - right now that's the only case we're in
133 * softirq context here, use separate counter for that.
136 * Only obd_memory uses LPROCFS_STATS_FLAG_IRQ_SAFE
137 * flag, because it needs accurate counting lest memory leak
138 * check reports error.
140 if (in_interrupt() &&
141 (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
142 percpu_cntr->lc_sum_irq -= amount;
144 percpu_cntr->lc_sum -= amount;
146 lprocfs_stats_unlock(stats, LPROCFS_GET_SMP_ID, &flags);
148 EXPORT_SYMBOL(lprocfs_counter_sub);
149 #endif /* CONFIG_PROC_FS */