fs/ceph/metric.c

   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
  11 static void ktime_to_ceph_timespec(struct ceph_timespec *ts, ktime_t val)
  12 {
  13         struct timespec64 t = ktime_to_timespec64(val);
  14         ceph_encode_timespec64(ts, &t);
  15 }
  16
  17 static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
  18                                    struct ceph_mds_session *s)
  19 {
  20         struct ceph_metric_head *head;
  21         struct ceph_metric_cap *cap;
  22         struct ceph_metric_read_latency *read;
  23         struct ceph_metric_write_latency *write;
  24         struct ceph_metric_metadata_latency *meta;
  25         struct ceph_metric_dlease *dlease;
  26         struct ceph_opened_files *files;
  27         struct ceph_pinned_icaps *icaps;
  28         struct ceph_opened_inodes *inodes;
  29         struct ceph_read_io_size *rsize;
  30         struct ceph_write_io_size *wsize;
  31         struct ceph_client_metric *m = &mdsc->metric;
  32         u64 nr_caps = atomic64_read(&m->total_caps);
  33         u32 header_len = sizeof(struct ceph_metric_header);
  34         struct ceph_msg *msg;
  35         s64 sum;
  36         s32 items = 0;
  37         s32 len;
  38
  39         /* Do not send the metrics until the MDS rank is ready */
  40         mutex_lock(&mdsc->mutex);
  41         if (ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) != CEPH_MDS_STATE_ACTIVE) {
  42                 mutex_unlock(&mdsc->mutex);
  43                 return false;
  44         }
  45         mutex_unlock(&mdsc->mutex);
  46
  47         len = sizeof(*head) + sizeof(*cap) + sizeof(*read) + sizeof(*write)
  48               + sizeof(*meta) + sizeof(*dlease) + sizeof(*files)
  49               + sizeof(*icaps) + sizeof(*inodes) + sizeof(*rsize)
  50               + sizeof(*wsize);
  51
  52         msg = ceph_msg_new(CEPH_MSG_CLIENT_METRICS, len, GFP_NOFS, true);
  53         if (!msg) {
  54                 pr_err("send metrics to mds%d, failed to allocate message\n",
  55                        s->s_mds);
  56                 return false;
  57         }
  58
  59         head = msg->front.iov_base;
  60
  61         /* encode the cap metric */
  62         cap = (struct ceph_metric_cap *)(head + 1);
  63         cap->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_CAP_INFO);
  64         cap->header.ver = 1;
  65         cap->header.compat = 1;
  66         cap->header.data_len = cpu_to_le32(sizeof(*cap) - header_len);
  67         cap->hit = cpu_to_le64(percpu_counter_sum(&m->i_caps_hit));
  68         cap->mis = cpu_to_le64(percpu_counter_sum(&m->i_caps_mis));
  69         cap->total = cpu_to_le64(nr_caps);
  70         items++;
  71
  72         /* encode the read latency metric */
  73         read = (struct ceph_metric_read_latency *)(cap + 1);
  74         read->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_READ_LATENCY);
  75         read->header.ver = 2;
  76         read->header.compat = 1;
  77         read->header.data_len = cpu_to_le32(sizeof(*read) - header_len);
  78         sum = m->metric[METRIC_READ].latency_sum;
  79         ktime_to_ceph_timespec(&read->lat, sum);
  80         ktime_to_ceph_timespec(&read->avg, m->metric[METRIC_READ].latency_avg);
  81         read->sq_sum = cpu_to_le64(m->metric[METRIC_READ].latency_sq_sum);
  82         read->count = cpu_to_le64(m->metric[METRIC_READ].total);
  83         items++;
  84
  85         /* encode the write latency metric */
  86         write = (struct ceph_metric_write_latency *)(read + 1);
  87         write->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_WRITE_LATENCY);
  88         write->header.ver = 2;
  89         write->header.compat = 1;
  90         write->header.data_len = cpu_to_le32(sizeof(*write) - header_len);
  91         sum = m->metric[METRIC_WRITE].latency_sum;
  92         ktime_to_ceph_timespec(&write->lat, sum);
  93         ktime_to_ceph_timespec(&write->avg, m->metric[METRIC_WRITE].latency_avg);
  94         write->sq_sum = cpu_to_le64(m->metric[METRIC_WRITE].latency_sq_sum);
  95         write->count = cpu_to_le64(m->metric[METRIC_WRITE].total);
  96         items++;
  97
  98         /* encode the metadata latency metric */
  99         meta = (struct ceph_metric_metadata_latency *)(write + 1);
 100         meta->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_METADATA_LATENCY);
 101         meta->header.ver = 2;
 102         meta->header.compat = 1;
 103         meta->header.data_len = cpu_to_le32(sizeof(*meta) - header_len);
 104         sum = m->metric[METRIC_METADATA].latency_sum;
 105         ktime_to_ceph_timespec(&meta->lat, sum);
 106         ktime_to_ceph_timespec(&meta->avg, m->metric[METRIC_METADATA].latency_avg);
 107         meta->sq_sum = cpu_to_le64(m->metric[METRIC_METADATA].latency_sq_sum);
 108         meta->count = cpu_to_le64(m->metric[METRIC_METADATA].total);
 109         items++;
 110
 111         /* encode the dentry lease metric */
 112         dlease = (struct ceph_metric_dlease *)(meta + 1);
 113         dlease->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_DENTRY_LEASE);
 114         dlease->header.ver = 1;
 115         dlease->header.compat = 1;
 116         dlease->header.data_len = cpu_to_le32(sizeof(*dlease) - header_len);
 117         dlease->hit = cpu_to_le64(percpu_counter_sum(&m->d_lease_hit));
 118         dlease->mis = cpu_to_le64(percpu_counter_sum(&m->d_lease_mis));
 119         dlease->total = cpu_to_le64(atomic64_read(&m->total_dentries));
 120         items++;
 121
 122         sum = percpu_counter_sum(&m->total_inodes);
 123
 124         /* encode the opened files metric */
 125         files = (struct ceph_opened_files *)(dlease + 1);
 126         files->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_OPENED_FILES);
 127         files->header.ver = 1;
 128         files->header.compat = 1;
 129         files->header.data_len = cpu_to_le32(sizeof(*files) - header_len);
 130         files->opened_files = cpu_to_le64(atomic64_read(&m->opened_files));
 131         files->total = cpu_to_le64(sum);
 132         items++;
 133
 134         /* encode the pinned icaps metric */
 135         icaps = (struct ceph_pinned_icaps *)(files + 1);
 136         icaps->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_PINNED_ICAPS);
 137         icaps->header.ver = 1;
 138         icaps->header.compat = 1;
 139         icaps->header.data_len = cpu_to_le32(sizeof(*icaps) - header_len);
 140         icaps->pinned_icaps = cpu_to_le64(nr_caps);
 141         icaps->total = cpu_to_le64(sum);
 142         items++;
 143
 144         /* encode the opened inodes metric */
 145         inodes = (struct ceph_opened_inodes *)(icaps + 1);
 146         inodes->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_OPENED_INODES);
 147         inodes->header.ver = 1;
 148         inodes->header.compat = 1;
 149         inodes->header.data_len = cpu_to_le32(sizeof(*inodes) - header_len);
 150         inodes->opened_inodes = cpu_to_le64(percpu_counter_sum(&m->opened_inodes));
 151         inodes->total = cpu_to_le64(sum);
 152         items++;
 153
 154         /* encode the read io size metric */
 155         rsize = (struct ceph_read_io_size *)(inodes + 1);
 156         rsize->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_READ_IO_SIZES);
 157         rsize->header.ver = 1;
 158         rsize->header.compat = 1;
 159         rsize->header.data_len = cpu_to_le32(sizeof(*rsize) - header_len);
 160         rsize->total_ops = cpu_to_le64(m->metric[METRIC_READ].total);
 161         rsize->total_size = cpu_to_le64(m->metric[METRIC_READ].size_sum);
 162         items++;
 163
 164         /* encode the write io size metric */
 165         wsize = (struct ceph_write_io_size *)(rsize + 1);
 166         wsize->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_WRITE_IO_SIZES);
 167         wsize->header.ver = 1;
 168         wsize->header.compat = 1;
 169         wsize->header.data_len = cpu_to_le32(sizeof(*wsize) - header_len);
 170         wsize->total_ops = cpu_to_le64(m->metric[METRIC_WRITE].total);
 171         wsize->total_size = cpu_to_le64(m->metric[METRIC_WRITE].size_sum);
 172         items++;
 173
 174         put_unaligned_le32(items, &head->num);
 175         msg->front.iov_len = len;
 176         msg->hdr.version = cpu_to_le16(1);
 177         msg->hdr.compat_version = cpu_to_le16(1);
 178         msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
 179         ceph_con_send(&s->s_con, msg);
 180
 181         return true;
 182 }
 183
 184
 185 static void metric_get_session(struct ceph_mds_client *mdsc)
 186 {
 187         struct ceph_mds_session *s;
 188         int i;
 189
 190         mutex_lock(&mdsc->mutex);
 191         for (i = 0; i < mdsc->max_sessions; i++) {
 192                 s = __ceph_lookup_mds_session(mdsc, i);
 193                 if (!s)
 194                         continue;
 195
 196                 /*
 197                  * Skip it if MDS doesn't support the metric collection,
 198                  * or the MDS will close the session's socket connection
 199                  * directly when it get this message.
 200                  */
 201                 if (check_session_state(s) &&
 202                     test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &s->s_features)) {
 203                         mdsc->metric.session = s;
 204                         break;
 205                 }
 206
 207                 ceph_put_mds_session(s);
 208         }
 209         mutex_unlock(&mdsc->mutex);
 210 }
 211
 212 static void metric_delayed_work(struct work_struct *work)
 213 {
 214         struct ceph_client_metric *m =
 215                 container_of(work, struct ceph_client_metric, delayed_work.work);
 216         struct ceph_mds_client *mdsc =
 217                 container_of(m, struct ceph_mds_client, metric);
 218
 219         if (mdsc->stopping || disable_send_metrics)
 220                 return;
 221
 222         if (!m->session || !check_session_state(m->session)) {
 223                 if (m->session) {
 224                         ceph_put_mds_session(m->session);
 225                         m->session = NULL;
 226                 }
 227                 metric_get_session(mdsc);
 228         }
 229         if (m->session) {
 230                 ceph_mdsc_send_metrics(mdsc, m->session);
 231                 metric_schedule_delayed(m);
 232         }
 233 }
 234
 235 int ceph_metric_init(struct ceph_client_metric *m)
 236 {
 237         struct ceph_metric *metric;
 238         int ret, i;
 239
 240         if (!m)
 241                 return -EINVAL;
 242
 243         atomic64_set(&m->total_dentries, 0);
 244         ret = percpu_counter_init(&m->d_lease_hit, 0, GFP_KERNEL);
 245         if (ret)
 246                 return ret;
 247
 248         ret = percpu_counter_init(&m->d_lease_mis, 0, GFP_KERNEL);
 249         if (ret)
 250                 goto err_d_lease_mis;
 251
 252         atomic64_set(&m->total_caps, 0);
 253         ret = percpu_counter_init(&m->i_caps_hit, 0, GFP_KERNEL);
 254         if (ret)
 255                 goto err_i_caps_hit;
 256
 257         ret = percpu_counter_init(&m->i_caps_mis, 0, GFP_KERNEL);
 258         if (ret)
 259                 goto err_i_caps_mis;
 260
 261         for (i = 0; i < METRIC_MAX; i++) {
 262                 metric = &m->metric[i];
 263                 spin_lock_init(&metric->lock);
 264                 metric->size_sum = 0;
 265                 metric->size_min = U64_MAX;
 266                 metric->size_max = 0;
 267                 metric->total = 0;
 268                 metric->latency_sum = 0;
 269                 metric->latency_avg = 0;
 270                 metric->latency_sq_sum = 0;
 271                 metric->latency_min = KTIME_MAX;
 272                 metric->latency_max = 0;
 273         }
 274
 275         atomic64_set(&m->opened_files, 0);
 276         ret = percpu_counter_init(&m->opened_inodes, 0, GFP_KERNEL);
 277         if (ret)
 278                 goto err_opened_inodes;
 279         ret = percpu_counter_init(&m->total_inodes, 0, GFP_KERNEL);
 280         if (ret)
 281                 goto err_total_inodes;
 282
 283         m->session = NULL;
 284         INIT_DELAYED_WORK(&m->delayed_work, metric_delayed_work);
 285
 286         return 0;
 287
 288 err_total_inodes:
 289         percpu_counter_destroy(&m->opened_inodes);
 290 err_opened_inodes:
 291         percpu_counter_destroy(&m->i_caps_mis);
 292 err_i_caps_mis:
 293         percpu_counter_destroy(&m->i_caps_hit);
 294 err_i_caps_hit:
 295         percpu_counter_destroy(&m->d_lease_mis);
 296 err_d_lease_mis:
 297         percpu_counter_destroy(&m->d_lease_hit);
 298
 299         return ret;
 300 }
 301
 302 void ceph_metric_destroy(struct ceph_client_metric *m)
 303 {
 304         if (!m)
 305                 return;
 306
 307         cancel_delayed_work_sync(&m->delayed_work);
 308
 309         percpu_counter_destroy(&m->total_inodes);
 310         percpu_counter_destroy(&m->opened_inodes);
 311         percpu_counter_destroy(&m->i_caps_mis);
 312         percpu_counter_destroy(&m->i_caps_hit);
 313         percpu_counter_destroy(&m->d_lease_mis);
 314         percpu_counter_destroy(&m->d_lease_hit);
 315
 316         ceph_put_mds_session(m->session);
 317 }
 318
 319 #define METRIC_UPDATE_MIN_MAX(min, max, new)    \
 320 {                                               \
 321         if (unlikely(new < min))                \
 322                 min = new;                      \
 323         if (unlikely(new > max))                \
 324                 max = new;                      \
 325 }
 326
 327 static inline void __update_mean_and_stdev(ktime_t total, ktime_t *lavg,
 328                                            ktime_t *sq_sump, ktime_t lat)
 329 {
 330         ktime_t avg;
 331
 332         if (unlikely(total == 1)) {
 333                 *lavg = lat;
 334         } else {
 335                 /* the sq is (lat - old_avg) * (lat - new_avg) */
 336                 avg = *lavg + div64_s64(lat - *lavg, total);
 337                 *sq_sump += (lat - *lavg)*(lat - avg);
 338                 *lavg = avg;
 339         }
 340 }
 341
 342 void ceph_update_metrics(struct ceph_metric *m,
 343                          ktime_t r_start, ktime_t r_end,
 344                          unsigned int size, int rc)
 345 {
 346         ktime_t lat = ktime_sub(r_end, r_start);
 347         ktime_t total;
 348
 349         if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))
 350                 return;
 351
 352         spin_lock(&m->lock);
 353         total = ++m->total;
 354         m->size_sum += size;
 355         METRIC_UPDATE_MIN_MAX(m->size_min, m->size_max, size);
 356         m->latency_sum += lat;
 357         METRIC_UPDATE_MIN_MAX(m->latency_min, m->latency_max, lat);
 358         __update_mean_and_stdev(total, &m->latency_avg, &m->latency_sq_sum,
 359                                 lat);
 360         spin_unlock(&m->lock);
 361 }