1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/types.h>
5 #include <linux/percpu_counter.h>
6 #include <linux/math64.h>
9 #include "mds_client.h"
11 static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
12 struct ceph_mds_session *s)
14 struct ceph_metric_head *head;
15 struct ceph_metric_cap *cap;
16 struct ceph_metric_read_latency *read;
17 struct ceph_metric_write_latency *write;
18 struct ceph_metric_metadata_latency *meta;
19 struct ceph_client_metric *m = &mdsc->metric;
20 u64 nr_caps = atomic64_read(&m->total_caps);
27 len = sizeof(*head) + sizeof(*cap) + sizeof(*read) + sizeof(*write)
30 msg = ceph_msg_new(CEPH_MSG_CLIENT_METRICS, len, GFP_NOFS, true);
32 pr_err("send metrics to mds%d, failed to allocate message\n",
37 head = msg->front.iov_base;
39 /* encode the cap metric */
40 cap = (struct ceph_metric_cap *)(head + 1);
41 cap->type = cpu_to_le32(CLIENT_METRIC_TYPE_CAP_INFO);
44 cap->data_len = cpu_to_le32(sizeof(*cap) - 10);
45 cap->hit = cpu_to_le64(percpu_counter_sum(&mdsc->metric.i_caps_hit));
46 cap->mis = cpu_to_le64(percpu_counter_sum(&mdsc->metric.i_caps_mis));
47 cap->total = cpu_to_le64(nr_caps);
50 /* encode the read latency metric */
51 read = (struct ceph_metric_read_latency *)(cap + 1);
52 read->type = cpu_to_le32(CLIENT_METRIC_TYPE_READ_LATENCY);
55 read->data_len = cpu_to_le32(sizeof(*read) - 10);
56 sum = m->read_latency_sum;
57 jiffies_to_timespec64(sum, &ts);
58 read->sec = cpu_to_le32(ts.tv_sec);
59 read->nsec = cpu_to_le32(ts.tv_nsec);
62 /* encode the write latency metric */
63 write = (struct ceph_metric_write_latency *)(read + 1);
64 write->type = cpu_to_le32(CLIENT_METRIC_TYPE_WRITE_LATENCY);
67 write->data_len = cpu_to_le32(sizeof(*write) - 10);
68 sum = m->write_latency_sum;
69 jiffies_to_timespec64(sum, &ts);
70 write->sec = cpu_to_le32(ts.tv_sec);
71 write->nsec = cpu_to_le32(ts.tv_nsec);
74 /* encode the metadata latency metric */
75 meta = (struct ceph_metric_metadata_latency *)(write + 1);
76 meta->type = cpu_to_le32(CLIENT_METRIC_TYPE_METADATA_LATENCY);
79 meta->data_len = cpu_to_le32(sizeof(*meta) - 10);
80 sum = m->metadata_latency_sum;
81 jiffies_to_timespec64(sum, &ts);
82 meta->sec = cpu_to_le32(ts.tv_sec);
83 meta->nsec = cpu_to_le32(ts.tv_nsec);
86 put_unaligned_le32(items, &head->num);
87 msg->front.iov_len = len;
88 msg->hdr.version = cpu_to_le16(1);
89 msg->hdr.compat_version = cpu_to_le16(1);
90 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
91 dout("client%llu send metrics to mds%d\n",
92 ceph_client_gid(mdsc->fsc->client), s->s_mds);
93 ceph_con_send(&s->s_con, msg);
99 static void metric_get_session(struct ceph_mds_client *mdsc)
101 struct ceph_mds_session *s;
104 mutex_lock(&mdsc->mutex);
105 for (i = 0; i < mdsc->max_sessions; i++) {
106 s = __ceph_lookup_mds_session(mdsc, i);
111 * Skip it if MDS doesn't support the metric collection,
112 * or the MDS will close the session's socket connection
113 * directly when it get this message.
115 if (check_session_state(s) &&
116 test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &s->s_features)) {
117 mdsc->metric.session = s;
121 ceph_put_mds_session(s);
123 mutex_unlock(&mdsc->mutex);
126 static void metric_delayed_work(struct work_struct *work)
128 struct ceph_client_metric *m =
129 container_of(work, struct ceph_client_metric, delayed_work.work);
130 struct ceph_mds_client *mdsc =
131 container_of(m, struct ceph_mds_client, metric);
136 if (!m->session || !check_session_state(m->session)) {
138 ceph_put_mds_session(m->session);
141 metric_get_session(mdsc);
144 ceph_mdsc_send_metrics(mdsc, m->session);
145 metric_schedule_delayed(m);
149 int ceph_metric_init(struct ceph_client_metric *m)
156 atomic64_set(&m->total_dentries, 0);
157 ret = percpu_counter_init(&m->d_lease_hit, 0, GFP_KERNEL);
161 ret = percpu_counter_init(&m->d_lease_mis, 0, GFP_KERNEL);
163 goto err_d_lease_mis;
165 atomic64_set(&m->total_caps, 0);
166 ret = percpu_counter_init(&m->i_caps_hit, 0, GFP_KERNEL);
170 ret = percpu_counter_init(&m->i_caps_mis, 0, GFP_KERNEL);
174 spin_lock_init(&m->read_latency_lock);
175 m->read_latency_sq_sum = 0;
176 m->read_latency_min = KTIME_MAX;
177 m->read_latency_max = 0;
179 m->read_latency_sum = 0;
181 spin_lock_init(&m->write_latency_lock);
182 m->write_latency_sq_sum = 0;
183 m->write_latency_min = KTIME_MAX;
184 m->write_latency_max = 0;
186 m->write_latency_sum = 0;
188 spin_lock_init(&m->metadata_latency_lock);
189 m->metadata_latency_sq_sum = 0;
190 m->metadata_latency_min = KTIME_MAX;
191 m->metadata_latency_max = 0;
192 m->total_metadatas = 0;
193 m->metadata_latency_sum = 0;
196 INIT_DELAYED_WORK(&m->delayed_work, metric_delayed_work);
201 percpu_counter_destroy(&m->i_caps_hit);
203 percpu_counter_destroy(&m->d_lease_mis);
205 percpu_counter_destroy(&m->d_lease_hit);
210 void ceph_metric_destroy(struct ceph_client_metric *m)
215 percpu_counter_destroy(&m->i_caps_mis);
216 percpu_counter_destroy(&m->i_caps_hit);
217 percpu_counter_destroy(&m->d_lease_mis);
218 percpu_counter_destroy(&m->d_lease_hit);
220 cancel_delayed_work_sync(&m->delayed_work);
223 ceph_put_mds_session(m->session);
226 static inline void __update_latency(ktime_t *totalp, ktime_t *lsump,
227 ktime_t *min, ktime_t *max,
228 ktime_t *sq_sump, ktime_t lat)
230 ktime_t total, avg, sq, lsum;
233 lsum = (*lsump += lat);
235 if (unlikely(lat < *min))
237 if (unlikely(lat > *max))
240 if (unlikely(total == 1))
243 /* the sq is (lat - old_avg) * (lat - new_avg) */
244 avg = DIV64_U64_ROUND_CLOSEST((lsum - lat), (total - 1));
246 avg = DIV64_U64_ROUND_CLOSEST(lsum, total);
247 sq = sq * (lat - avg);
251 void ceph_update_read_latency(struct ceph_client_metric *m,
252 ktime_t r_start, ktime_t r_end,
255 ktime_t lat = ktime_sub(r_end, r_start);
257 if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))
260 spin_lock(&m->read_latency_lock);
261 __update_latency(&m->total_reads, &m->read_latency_sum,
262 &m->read_latency_min, &m->read_latency_max,
263 &m->read_latency_sq_sum, lat);
264 spin_unlock(&m->read_latency_lock);
267 void ceph_update_write_latency(struct ceph_client_metric *m,
268 ktime_t r_start, ktime_t r_end,
271 ktime_t lat = ktime_sub(r_end, r_start);
273 if (unlikely(rc && rc != -ETIMEDOUT))
276 spin_lock(&m->write_latency_lock);
277 __update_latency(&m->total_writes, &m->write_latency_sum,
278 &m->write_latency_min, &m->write_latency_max,
279 &m->write_latency_sq_sum, lat);
280 spin_unlock(&m->write_latency_lock);
283 void ceph_update_metadata_latency(struct ceph_client_metric *m,
284 ktime_t r_start, ktime_t r_end,
287 ktime_t lat = ktime_sub(r_end, r_start);
289 if (unlikely(rc && rc != -ENOENT))
292 spin_lock(&m->metadata_latency_lock);
293 __update_latency(&m->total_metadatas, &m->metadata_latency_sum,
294 &m->metadata_latency_min, &m->metadata_latency_max,
295 &m->metadata_latency_sq_sum, lat);
296 spin_unlock(&m->metadata_latency_lock);