1 /* SPDX-License-Identifier: GPL-2.0 */
3 #include <linux/types.h>
4 #include <linux/percpu_counter.h>
5 #include <linux/math64.h>
9 int ceph_metric_init(struct ceph_client_metric *m)
16 atomic64_set(&m->total_dentries, 0);
17 ret = percpu_counter_init(&m->d_lease_hit, 0, GFP_KERNEL);
21 ret = percpu_counter_init(&m->d_lease_mis, 0, GFP_KERNEL);
25 ret = percpu_counter_init(&m->i_caps_hit, 0, GFP_KERNEL);
29 ret = percpu_counter_init(&m->i_caps_mis, 0, GFP_KERNEL);
33 spin_lock_init(&m->read_latency_lock);
34 m->read_latency_sq_sum = 0;
35 m->read_latency_min = KTIME_MAX;
36 m->read_latency_max = 0;
38 m->read_latency_sum = 0;
40 spin_lock_init(&m->write_latency_lock);
41 m->write_latency_sq_sum = 0;
42 m->write_latency_min = KTIME_MAX;
43 m->write_latency_max = 0;
45 m->write_latency_sum = 0;
47 spin_lock_init(&m->metadata_latency_lock);
48 m->metadata_latency_sq_sum = 0;
49 m->metadata_latency_min = KTIME_MAX;
50 m->metadata_latency_max = 0;
51 m->total_metadatas = 0;
52 m->metadata_latency_sum = 0;
57 percpu_counter_destroy(&m->i_caps_hit);
59 percpu_counter_destroy(&m->d_lease_mis);
61 percpu_counter_destroy(&m->d_lease_hit);
66 void ceph_metric_destroy(struct ceph_client_metric *m)
71 percpu_counter_destroy(&m->i_caps_mis);
72 percpu_counter_destroy(&m->i_caps_hit);
73 percpu_counter_destroy(&m->d_lease_mis);
74 percpu_counter_destroy(&m->d_lease_hit);
77 static inline void __update_latency(ktime_t *totalp, ktime_t *lsump,
78 ktime_t *min, ktime_t *max,
79 ktime_t *sq_sump, ktime_t lat)
81 ktime_t total, avg, sq, lsum;
84 lsum = (*lsump += lat);
86 if (unlikely(lat < *min))
88 if (unlikely(lat > *max))
91 if (unlikely(total == 1))
94 /* the sq is (lat - old_avg) * (lat - new_avg) */
95 avg = DIV64_U64_ROUND_CLOSEST((lsum - lat), (total - 1));
97 avg = DIV64_U64_ROUND_CLOSEST(lsum, total);
98 sq = sq * (lat - avg);
102 void ceph_update_read_latency(struct ceph_client_metric *m,
103 ktime_t r_start, ktime_t r_end,
106 ktime_t lat = ktime_sub(r_end, r_start);
108 if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))
111 spin_lock(&m->read_latency_lock);
112 __update_latency(&m->total_reads, &m->read_latency_sum,
113 &m->read_latency_min, &m->read_latency_max,
114 &m->read_latency_sq_sum, lat);
115 spin_unlock(&m->read_latency_lock);
118 void ceph_update_write_latency(struct ceph_client_metric *m,
119 ktime_t r_start, ktime_t r_end,
122 ktime_t lat = ktime_sub(r_end, r_start);
124 if (unlikely(rc && rc != -ETIMEDOUT))
127 spin_lock(&m->write_latency_lock);
128 __update_latency(&m->total_writes, &m->write_latency_sum,
129 &m->write_latency_min, &m->write_latency_max,
130 &m->write_latency_sq_sum, lat);
131 spin_unlock(&m->write_latency_lock);
134 void ceph_update_metadata_latency(struct ceph_client_metric *m,
135 ktime_t r_start, ktime_t r_end,
138 ktime_t lat = ktime_sub(r_end, r_start);
140 if (unlikely(rc && rc != -ENOENT))
143 spin_lock(&m->metadata_latency_lock);
144 __update_latency(&m->total_metadatas, &m->metadata_latency_sum,
145 &m->metadata_latency_min, &m->metadata_latency_max,
146 &m->metadata_latency_sq_sum, lat);
147 spin_unlock(&m->metadata_latency_lock);