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 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
 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
 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
 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
 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
 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
 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 }