1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/types.h>
5 #include <linux/percpu_counter.h>
6 #include <linux/math64.h>
7
8 #include "metric.h"
9 #include "mds_client.h"
10
ceph_mdsc_send_metrics(struct ceph_mds_client * mdsc,struct ceph_mds_session * s)11 static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
12 struct ceph_mds_session *s)
13 {
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_metric_dlease *dlease;
20 struct ceph_opened_files *files;
21 struct ceph_pinned_icaps *icaps;
22 struct ceph_opened_inodes *inodes;
23 struct ceph_read_io_size *rsize;
24 struct ceph_write_io_size *wsize;
25 struct ceph_client_metric *m = &mdsc->metric;
26 u64 nr_caps = atomic64_read(&m->total_caps);
27 u32 header_len = sizeof(struct ceph_metric_header);
28 struct ceph_msg *msg;
29 struct timespec64 ts;
30 s64 sum;
31 s32 items = 0;
32 s32 len;
33
34 len = sizeof(*head) + sizeof(*cap) + sizeof(*read) + sizeof(*write)
35 + sizeof(*meta) + sizeof(*dlease) + sizeof(*files)
36 + sizeof(*icaps) + sizeof(*inodes) + sizeof(*rsize)
37 + sizeof(*wsize);
38
39 msg = ceph_msg_new(CEPH_MSG_CLIENT_METRICS, len, GFP_NOFS, true);
40 if (!msg) {
41 pr_err("send metrics to mds%d, failed to allocate message\n",
42 s->s_mds);
43 return false;
44 }
45
46 head = msg->front.iov_base;
47
48 /* encode the cap metric */
49 cap = (struct ceph_metric_cap *)(head + 1);
50 cap->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_CAP_INFO);
51 cap->header.ver = 1;
52 cap->header.compat = 1;
53 cap->header.data_len = cpu_to_le32(sizeof(*cap) - header_len);
54 cap->hit = cpu_to_le64(percpu_counter_sum(&m->i_caps_hit));
55 cap->mis = cpu_to_le64(percpu_counter_sum(&m->i_caps_mis));
56 cap->total = cpu_to_le64(nr_caps);
57 items++;
58
59 /* encode the read latency metric */
60 read = (struct ceph_metric_read_latency *)(cap + 1);
61 read->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_READ_LATENCY);
62 read->header.ver = 1;
63 read->header.compat = 1;
64 read->header.data_len = cpu_to_le32(sizeof(*read) - header_len);
65 sum = m->metric[METRIC_READ].latency_sum;
66 jiffies_to_timespec64(sum, &ts);
67 read->sec = cpu_to_le32(ts.tv_sec);
68 read->nsec = cpu_to_le32(ts.tv_nsec);
69 items++;
70
71 /* encode the write latency metric */
72 write = (struct ceph_metric_write_latency *)(read + 1);
73 write->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_WRITE_LATENCY);
74 write->header.ver = 1;
75 write->header.compat = 1;
76 write->header.data_len = cpu_to_le32(sizeof(*write) - header_len);
77 sum = m->metric[METRIC_WRITE].latency_sum;
78 jiffies_to_timespec64(sum, &ts);
79 write->sec = cpu_to_le32(ts.tv_sec);
80 write->nsec = cpu_to_le32(ts.tv_nsec);
81 items++;
82
83 /* encode the metadata latency metric */
84 meta = (struct ceph_metric_metadata_latency *)(write + 1);
85 meta->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_METADATA_LATENCY);
86 meta->header.ver = 1;
87 meta->header.compat = 1;
88 meta->header.data_len = cpu_to_le32(sizeof(*meta) - header_len);
89 sum = m->metric[METRIC_METADATA].latency_sum;
90 jiffies_to_timespec64(sum, &ts);
91 meta->sec = cpu_to_le32(ts.tv_sec);
92 meta->nsec = cpu_to_le32(ts.tv_nsec);
93 items++;
94
95 /* encode the dentry lease metric */
96 dlease = (struct ceph_metric_dlease *)(meta + 1);
97 dlease->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_DENTRY_LEASE);
98 dlease->header.ver = 1;
99 dlease->header.compat = 1;
100 dlease->header.data_len = cpu_to_le32(sizeof(*dlease) - header_len);
101 dlease->hit = cpu_to_le64(percpu_counter_sum(&m->d_lease_hit));
102 dlease->mis = cpu_to_le64(percpu_counter_sum(&m->d_lease_mis));
103 dlease->total = cpu_to_le64(atomic64_read(&m->total_dentries));
104 items++;
105
106 sum = percpu_counter_sum(&m->total_inodes);
107
108 /* encode the opened files metric */
109 files = (struct ceph_opened_files *)(dlease + 1);
110 files->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_OPENED_FILES);
111 files->header.ver = 1;
112 files->header.compat = 1;
113 files->header.data_len = cpu_to_le32(sizeof(*files) - header_len);
114 files->opened_files = cpu_to_le64(atomic64_read(&m->opened_files));
115 files->total = cpu_to_le64(sum);
116 items++;
117
118 /* encode the pinned icaps metric */
119 icaps = (struct ceph_pinned_icaps *)(files + 1);
120 icaps->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_PINNED_ICAPS);
121 icaps->header.ver = 1;
122 icaps->header.compat = 1;
123 icaps->header.data_len = cpu_to_le32(sizeof(*icaps) - header_len);
124 icaps->pinned_icaps = cpu_to_le64(nr_caps);
125 icaps->total = cpu_to_le64(sum);
126 items++;
127
128 /* encode the opened inodes metric */
129 inodes = (struct ceph_opened_inodes *)(icaps + 1);
130 inodes->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_OPENED_INODES);
131 inodes->header.ver = 1;
132 inodes->header.compat = 1;
133 inodes->header.data_len = cpu_to_le32(sizeof(*inodes) - header_len);
134 inodes->opened_inodes = cpu_to_le64(percpu_counter_sum(&m->opened_inodes));
135 inodes->total = cpu_to_le64(sum);
136 items++;
137
138 /* encode the read io size metric */
139 rsize = (struct ceph_read_io_size *)(inodes + 1);
140 rsize->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_READ_IO_SIZES);
141 rsize->header.ver = 1;
142 rsize->header.compat = 1;
143 rsize->header.data_len = cpu_to_le32(sizeof(*rsize) - header_len);
144 rsize->total_ops = cpu_to_le64(m->metric[METRIC_READ].total);
145 rsize->total_size = cpu_to_le64(m->metric[METRIC_READ].size_sum);
146 items++;
147
148 /* encode the write io size metric */
149 wsize = (struct ceph_write_io_size *)(rsize + 1);
150 wsize->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_WRITE_IO_SIZES);
151 wsize->header.ver = 1;
152 wsize->header.compat = 1;
153 wsize->header.data_len = cpu_to_le32(sizeof(*wsize) - header_len);
154 wsize->total_ops = cpu_to_le64(m->metric[METRIC_WRITE].total);
155 wsize->total_size = cpu_to_le64(m->metric[METRIC_WRITE].size_sum);
156 items++;
157
158 put_unaligned_le32(items, &head->num);
159 msg->front.iov_len = len;
160 msg->hdr.version = cpu_to_le16(1);
161 msg->hdr.compat_version = cpu_to_le16(1);
162 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
163 dout("client%llu send metrics to mds%d\n",
164 ceph_client_gid(mdsc->fsc->client), s->s_mds);
165 ceph_con_send(&s->s_con, msg);
166
167 return true;
168 }
169
170
metric_get_session(struct ceph_mds_client * mdsc)171 static void metric_get_session(struct ceph_mds_client *mdsc)
172 {
173 struct ceph_mds_session *s;
174 int i;
175
176 mutex_lock(&mdsc->mutex);
177 for (i = 0; i < mdsc->max_sessions; i++) {
178 s = __ceph_lookup_mds_session(mdsc, i);
179 if (!s)
180 continue;
181
182 /*
183 * Skip it if MDS doesn't support the metric collection,
184 * or the MDS will close the session's socket connection
185 * directly when it get this message.
186 */
187 if (check_session_state(s) &&
188 test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &s->s_features)) {
189 mdsc->metric.session = s;
190 break;
191 }
192
193 ceph_put_mds_session(s);
194 }
195 mutex_unlock(&mdsc->mutex);
196 }
197
metric_delayed_work(struct work_struct * work)198 static void metric_delayed_work(struct work_struct *work)
199 {
200 struct ceph_client_metric *m =
201 container_of(work, struct ceph_client_metric, delayed_work.work);
202 struct ceph_mds_client *mdsc =
203 container_of(m, struct ceph_mds_client, metric);
204
205 if (mdsc->stopping)
206 return;
207
208 if (!m->session || !check_session_state(m->session)) {
209 if (m->session) {
210 ceph_put_mds_session(m->session);
211 m->session = NULL;
212 }
213 metric_get_session(mdsc);
214 }
215 if (m->session) {
216 ceph_mdsc_send_metrics(mdsc, m->session);
217 metric_schedule_delayed(m);
218 }
219 }
220
ceph_metric_init(struct ceph_client_metric * m)221 int ceph_metric_init(struct ceph_client_metric *m)
222 {
223 struct ceph_metric *metric;
224 int ret, i;
225
226 if (!m)
227 return -EINVAL;
228
229 atomic64_set(&m->total_dentries, 0);
230 ret = percpu_counter_init(&m->d_lease_hit, 0, GFP_KERNEL);
231 if (ret)
232 return ret;
233
234 ret = percpu_counter_init(&m->d_lease_mis, 0, GFP_KERNEL);
235 if (ret)
236 goto err_d_lease_mis;
237
238 atomic64_set(&m->total_caps, 0);
239 ret = percpu_counter_init(&m->i_caps_hit, 0, GFP_KERNEL);
240 if (ret)
241 goto err_i_caps_hit;
242
243 ret = percpu_counter_init(&m->i_caps_mis, 0, GFP_KERNEL);
244 if (ret)
245 goto err_i_caps_mis;
246
247 for (i = 0; i < METRIC_MAX; i++) {
248 metric = &m->metric[i];
249 spin_lock_init(&metric->lock);
250 metric->size_sum = 0;
251 metric->size_min = U64_MAX;
252 metric->size_max = 0;
253 metric->total = 0;
254 metric->latency_sum = 0;
255 metric->latency_sq_sum = 0;
256 metric->latency_min = KTIME_MAX;
257 metric->latency_max = 0;
258 }
259
260 atomic64_set(&m->opened_files, 0);
261 ret = percpu_counter_init(&m->opened_inodes, 0, GFP_KERNEL);
262 if (ret)
263 goto err_opened_inodes;
264 ret = percpu_counter_init(&m->total_inodes, 0, GFP_KERNEL);
265 if (ret)
266 goto err_total_inodes;
267
268 m->session = NULL;
269 INIT_DELAYED_WORK(&m->delayed_work, metric_delayed_work);
270
271 return 0;
272
273 err_total_inodes:
274 percpu_counter_destroy(&m->opened_inodes);
275 err_opened_inodes:
276 percpu_counter_destroy(&m->i_caps_mis);
277 err_i_caps_mis:
278 percpu_counter_destroy(&m->i_caps_hit);
279 err_i_caps_hit:
280 percpu_counter_destroy(&m->d_lease_mis);
281 err_d_lease_mis:
282 percpu_counter_destroy(&m->d_lease_hit);
283
284 return ret;
285 }
286
ceph_metric_destroy(struct ceph_client_metric * m)287 void ceph_metric_destroy(struct ceph_client_metric *m)
288 {
289 if (!m)
290 return;
291
292 cancel_delayed_work_sync(&m->delayed_work);
293
294 percpu_counter_destroy(&m->total_inodes);
295 percpu_counter_destroy(&m->opened_inodes);
296 percpu_counter_destroy(&m->i_caps_mis);
297 percpu_counter_destroy(&m->i_caps_hit);
298 percpu_counter_destroy(&m->d_lease_mis);
299 percpu_counter_destroy(&m->d_lease_hit);
300
301 ceph_put_mds_session(m->session);
302 }
303
304 #define METRIC_UPDATE_MIN_MAX(min, max, new) \
305 { \
306 if (unlikely(new < min)) \
307 min = new; \
308 if (unlikely(new > max)) \
309 max = new; \
310 }
311
__update_stdev(ktime_t total,ktime_t lsum,ktime_t * sq_sump,ktime_t lat)312 static inline void __update_stdev(ktime_t total, ktime_t lsum,
313 ktime_t *sq_sump, ktime_t lat)
314 {
315 ktime_t avg, sq;
316
317 if (unlikely(total == 1))
318 return;
319
320 /* the sq is (lat - old_avg) * (lat - new_avg) */
321 avg = DIV64_U64_ROUND_CLOSEST((lsum - lat), (total - 1));
322 sq = lat - avg;
323 avg = DIV64_U64_ROUND_CLOSEST(lsum, total);
324 sq = sq * (lat - avg);
325 *sq_sump += sq;
326 }
327
ceph_update_metrics(struct ceph_metric * m,ktime_t r_start,ktime_t r_end,unsigned int size,int rc)328 void ceph_update_metrics(struct ceph_metric *m,
329 ktime_t r_start, ktime_t r_end,
330 unsigned int size, int rc)
331 {
332 ktime_t lat = ktime_sub(r_end, r_start);
333 ktime_t total;
334
335 if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))
336 return;
337
338 spin_lock(&m->lock);
339 total = ++m->total;
340 m->size_sum += size;
341 METRIC_UPDATE_MIN_MAX(m->size_min, m->size_max, size);
342 m->latency_sum += lat;
343 METRIC_UPDATE_MIN_MAX(m->latency_min, m->latency_max, lat);
344 __update_stdev(total, m->latency_sum, &m->latency_sq_sum, lat);
345 spin_unlock(&m->lock);
346 }
347