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