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linux/fs/ceph/metric.c

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/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/ceph/ceph_debug.h>
#include <linux/types.h>
#include <linux/percpu_counter.h>
#include <linux/math64.h>
#include "metric.h"
#include "mds_client.h"
static void ktime_to_ceph_timespec(struct ceph_timespec *ts, ktime_t val)
{
struct timespec64 t = ktime_to_timespec64(val);
ceph_encode_timespec64(ts, &t);
}
static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
struct ceph_mds_session *s)
{
struct ceph_metric_head *head;
struct ceph_metric_cap *cap;
struct ceph_metric_read_latency *read;
struct ceph_metric_write_latency *write;
struct ceph_metric_metadata_latency *meta;
struct ceph_metric_dlease *dlease;
struct ceph_opened_files *files;
struct ceph_pinned_icaps *icaps;
struct ceph_opened_inodes *inodes;
struct ceph_read_io_size *rsize;
struct ceph_write_io_size *wsize;
struct ceph_client_metric *m = &mdsc->metric;
u64 nr_caps = atomic64_read(&m->total_caps);
u32 header_len = sizeof(struct ceph_metric_header);
struct ceph_client *cl = mdsc->fsc->client;
struct ceph_msg *msg;
s64 sum;
s32 items = 0;
s32 len;
/* Do not send the metrics until the MDS rank is ready */
mutex_lock(&mdsc->mutex);
if (ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) != CEPH_MDS_STATE_ACTIVE) {
mutex_unlock(&mdsc->mutex);
return false;
}
mutex_unlock(&mdsc->mutex);
len = sizeof(*head) + sizeof(*cap) + sizeof(*read) + sizeof(*write)
+ sizeof(*meta) + sizeof(*dlease) + sizeof(*files)
+ sizeof(*icaps) + sizeof(*inodes) + sizeof(*rsize)
+ sizeof(*wsize);
msg = ceph_msg_new(CEPH_MSG_CLIENT_METRICS, len, GFP_NOFS, true);
if (!msg) {
pr_err_client(cl, "to mds%d, failed to allocate message\n",
s->s_mds);
return false;
}
head = msg->front.iov_base;
/* encode the cap metric */
cap = (struct ceph_metric_cap *)(head + 1);
cap->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_CAP_INFO);
cap->header.ver = 1;
cap->header.compat = 1;
cap->header.data_len = cpu_to_le32(sizeof(*cap) - header_len);
cap->hit = cpu_to_le64(percpu_counter_sum(&m->i_caps_hit));
cap->mis = cpu_to_le64(percpu_counter_sum(&m->i_caps_mis));
cap->total = cpu_to_le64(nr_caps);
items++;
/* encode the read latency metric */
read = (struct ceph_metric_read_latency *)(cap + 1);
read->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_READ_LATENCY);
read->header.ver = 2;
read->header.compat = 1;
read->header.data_len = cpu_to_le32(sizeof(*read) - header_len);
sum = m->metric[METRIC_READ].latency_sum;
ktime_to_ceph_timespec(&read->lat, sum);
ktime_to_ceph_timespec(&read->avg, m->metric[METRIC_READ].latency_avg);
read->sq_sum = cpu_to_le64(m->metric[METRIC_READ].latency_sq_sum);
read->count = cpu_to_le64(m->metric[METRIC_READ].total);
items++;
/* encode the write latency metric */
write = (struct ceph_metric_write_latency *)(read + 1);
write->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_WRITE_LATENCY);
write->header.ver = 2;
write->header.compat = 1;
write->header.data_len = cpu_to_le32(sizeof(*write) - header_len);
sum = m->metric[METRIC_WRITE].latency_sum;
ktime_to_ceph_timespec(&write->lat, sum);
ktime_to_ceph_timespec(&write->avg, m->metric[METRIC_WRITE].latency_avg);
write->sq_sum = cpu_to_le64(m->metric[METRIC_WRITE].latency_sq_sum);
write->count = cpu_to_le64(m->metric[METRIC_WRITE].total);
items++;
/* encode the metadata latency metric */
meta = (struct ceph_metric_metadata_latency *)(write + 1);
meta->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_METADATA_LATENCY);
meta->header.ver = 2;
meta->header.compat = 1;
meta->header.data_len = cpu_to_le32(sizeof(*meta) - header_len);
sum = m->metric[METRIC_METADATA].latency_sum;
ktime_to_ceph_timespec(&meta->lat, sum);
ktime_to_ceph_timespec(&meta->avg, m->metric[METRIC_METADATA].latency_avg);
meta->sq_sum = cpu_to_le64(m->metric[METRIC_METADATA].latency_sq_sum);
meta->count = cpu_to_le64(m->metric[METRIC_METADATA].total);
items++;
/* encode the dentry lease metric */
dlease = (struct ceph_metric_dlease *)(meta + 1);
dlease->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_DENTRY_LEASE);
dlease->header.ver = 1;
dlease->header.compat = 1;
dlease->header.data_len = cpu_to_le32(sizeof(*dlease) - header_len);
dlease->hit = cpu_to_le64(percpu_counter_sum(&m->d_lease_hit));
dlease->mis = cpu_to_le64(percpu_counter_sum(&m->d_lease_mis));
dlease->total = cpu_to_le64(atomic64_read(&m->total_dentries));
items++;
sum = percpu_counter_sum(&m->total_inodes);
/* encode the opened files metric */
files = (struct ceph_opened_files *)(dlease + 1);
files->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_OPENED_FILES);
files->header.ver = 1;
files->header.compat = 1;
files->header.data_len = cpu_to_le32(sizeof(*files) - header_len);
files->opened_files = cpu_to_le64(atomic64_read(&m->opened_files));
files->total = cpu_to_le64(sum);
items++;
/* encode the pinned icaps metric */
icaps = (struct ceph_pinned_icaps *)(files + 1);
icaps->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_PINNED_ICAPS);
icaps->header.ver = 1;
icaps->header.compat = 1;
icaps->header.data_len = cpu_to_le32(sizeof(*icaps) - header_len);
icaps->pinned_icaps = cpu_to_le64(nr_caps);
icaps->total = cpu_to_le64(sum);
items++;
/* encode the opened inodes metric */
inodes = (struct ceph_opened_inodes *)(icaps + 1);
inodes->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_OPENED_INODES);
inodes->header.ver = 1;
inodes->header.compat = 1;
inodes->header.data_len = cpu_to_le32(sizeof(*inodes) - header_len);
inodes->opened_inodes = cpu_to_le64(percpu_counter_sum(&m->opened_inodes));
inodes->total = cpu_to_le64(sum);
items++;
/* encode the read io size metric */
rsize = (struct ceph_read_io_size *)(inodes + 1);
rsize->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_READ_IO_SIZES);
rsize->header.ver = 1;
rsize->header.compat = 1;
rsize->header.data_len = cpu_to_le32(sizeof(*rsize) - header_len);
rsize->total_ops = cpu_to_le64(m->metric[METRIC_READ].total);
rsize->total_size = cpu_to_le64(m->metric[METRIC_READ].size_sum);
items++;
/* encode the write io size metric */
wsize = (struct ceph_write_io_size *)(rsize + 1);
wsize->header.type = cpu_to_le32(CLIENT_METRIC_TYPE_WRITE_IO_SIZES);
wsize->header.ver = 1;
wsize->header.compat = 1;
wsize->header.data_len = cpu_to_le32(sizeof(*wsize) - header_len);
wsize->total_ops = cpu_to_le64(m->metric[METRIC_WRITE].total);
wsize->total_size = cpu_to_le64(m->metric[METRIC_WRITE].size_sum);
items++;
put_unaligned_le32(items, &head->num);
msg->front.iov_len = len;
msg->hdr.version = cpu_to_le16(1);
msg->hdr.compat_version = cpu_to_le16(1);
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
ceph_con_send(&s->s_con, msg);
return true;
}
static void metric_get_session(struct ceph_mds_client *mdsc)
{
struct ceph_mds_session *s;
int i;
mutex_lock(&mdsc->mutex);
for (i = 0; i < mdsc->max_sessions; i++) {
s = __ceph_lookup_mds_session(mdsc, i);
if (!s)
continue;
/*
* Skip it if MDS doesn't support the metric collection,
* or the MDS will close the session's socket connection
* directly when it get this message.
*/
if (check_session_state(s) &&
test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &s->s_features)) {
mdsc->metric.session = s;
break;
}
ceph_put_mds_session(s);
}
mutex_unlock(&mdsc->mutex);
}
static void metric_delayed_work(struct work_struct *work)
{
struct ceph_client_metric *m =
container_of(work, struct ceph_client_metric, delayed_work.work);
struct ceph_mds_client *mdsc =
container_of(m, struct ceph_mds_client, metric);
if (mdsc->stopping || disable_send_metrics)
return;
if (!m->session || !check_session_state(m->session)) {
if (m->session) {
ceph_put_mds_session(m->session);
m->session = NULL;
}
metric_get_session(mdsc);
}
if (m->session) {
ceph_mdsc_send_metrics(mdsc, m->session);
metric_schedule_delayed(m);
}
}
int ceph_metric_init(struct ceph_client_metric *m)
{
struct ceph_metric *metric;
int ret, i;
if (!m)
return -EINVAL;
atomic64_set(&m->total_dentries, 0);
ret = percpu_counter_init(&m->d_lease_hit, 0, GFP_KERNEL);
if (ret)
return ret;
ret = percpu_counter_init(&m->d_lease_mis, 0, GFP_KERNEL);
if (ret)
goto err_d_lease_mis;
atomic64_set(&m->total_caps, 0);
ret = percpu_counter_init(&m->i_caps_hit, 0, GFP_KERNEL);
if (ret)
goto err_i_caps_hit;
ret = percpu_counter_init(&m->i_caps_mis, 0, GFP_KERNEL);
if (ret)
goto err_i_caps_mis;
for (i = 0; i < METRIC_MAX; i++) {
metric = &m->metric[i];
spin_lock_init(&metric->lock);
metric->size_sum = 0;
metric->size_min = U64_MAX;
metric->size_max = 0;
metric->total = 0;
metric->latency_sum = 0;
metric->latency_avg = 0;
metric->latency_sq_sum = 0;
metric->latency_min = KTIME_MAX;
metric->latency_max = 0;
}
atomic64_set(&m->opened_files, 0);
ret = percpu_counter_init(&m->opened_inodes, 0, GFP_KERNEL);
if (ret)
goto err_opened_inodes;
ret = percpu_counter_init(&m->total_inodes, 0, GFP_KERNEL);
if (ret)
goto err_total_inodes;
m->session = NULL;
INIT_DELAYED_WORK(&m->delayed_work, metric_delayed_work);
return 0;
err_total_inodes:
percpu_counter_destroy(&m->opened_inodes);
err_opened_inodes:
percpu_counter_destroy(&m->i_caps_mis);
err_i_caps_mis:
percpu_counter_destroy(&m->i_caps_hit);
err_i_caps_hit:
percpu_counter_destroy(&m->d_lease_mis);
err_d_lease_mis:
percpu_counter_destroy(&m->d_lease_hit);
return ret;
}
void ceph_metric_destroy(struct ceph_client_metric *m)
{
if (!m)
return;
cancel_delayed_work_sync(&m->delayed_work);
percpu_counter_destroy(&m->total_inodes);
percpu_counter_destroy(&m->opened_inodes);
percpu_counter_destroy(&m->i_caps_mis);
percpu_counter_destroy(&m->i_caps_hit);
percpu_counter_destroy(&m->d_lease_mis);
percpu_counter_destroy(&m->d_lease_hit);
ceph_put_mds_session(m->session);
}
#define METRIC_UPDATE_MIN_MAX(min, max, new) \
{ \
if (unlikely(new < min)) \
min = new; \
if (unlikely(new > max)) \
max = new; \
}
static inline void __update_mean_and_stdev(ktime_t total, ktime_t *lavg,
ktime_t *sq_sump, ktime_t lat)
{
ktime_t avg;
if (unlikely(total == 1)) {
*lavg = lat;
} else {
/* the sq is (lat - old_avg) * (lat - new_avg) */
avg = *lavg + div64_s64(lat - *lavg, total);
*sq_sump += (lat - *lavg)*(lat - avg);
*lavg = avg;
}
}
void ceph_update_metrics(struct ceph_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc)
{
ktime_t lat = ktime_sub(r_end, r_start);
ktime_t total;
if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))
return;
spin_lock(&m->lock);
total = ++m->total;
m->size_sum += size;
METRIC_UPDATE_MIN_MAX(m->size_min, m->size_max, size);
m->latency_sum += lat;
METRIC_UPDATE_MIN_MAX(m->latency_min, m->latency_max, lat);
__update_mean_and_stdev(total, &m->latency_avg, &m->latency_sq_sum,
lat);
spin_unlock(&m->lock);
}