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linux/fs/ceph/metric.c
Jeff Layton b4002173b7 ceph: cancel delayed work instead of flushing on mdsc teardown 
The first thing metric_delayed_work does is check mdsc->stopping,
and then return immediately if it's set. That's good since we would
have already torn down the metric structures at this point, otherwise,
but there is no locking around mdsc->stopping.

It's possible that the ceph_metric_destroy call could race with the
delayed_work, in which case we could end up with the delayed_work
accessing destroyed percpu variables.

At this point in the mdsc teardown, the "stopping" flag has already been
set, so there's no benefit to flushing the work. Move the work
cancellation in ceph_metric_destroy ahead of the percpu variable
destruction, and eliminate the flush_delayed_work call in
ceph_mdsc_destroy.

Fixes: 18f473b384 ("ceph: periodically send perf metrics to MDSes")
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2021-09-02 22:49:17 +02:00

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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 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_msg *msg;
struct timespec64 ts;
s64 sum;
s32 items = 0;
s32 len;
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("send metrics 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 = 1;
read->header.compat = 1;
read->header.data_len = cpu_to_le32(sizeof(*read) - header_len);
sum = m->read_latency_sum;
jiffies_to_timespec64(sum, &ts);
read->sec = cpu_to_le32(ts.tv_sec);
read->nsec = cpu_to_le32(ts.tv_nsec);
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 = 1;
write->header.compat = 1;
write->header.data_len = cpu_to_le32(sizeof(*write) - header_len);
sum = m->write_latency_sum;
jiffies_to_timespec64(sum, &ts);
write->sec = cpu_to_le32(ts.tv_sec);
write->nsec = cpu_to_le32(ts.tv_nsec);
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 = 1;
meta->header.compat = 1;
meta->header.data_len = cpu_to_le32(sizeof(*meta) - header_len);
sum = m->metadata_latency_sum;
jiffies_to_timespec64(sum, &ts);
meta->sec = cpu_to_le32(ts.tv_sec);
meta->nsec = cpu_to_le32(ts.tv_nsec);
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->total_reads);
rsize->total_size = cpu_to_le64(m->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->total_writes);
wsize->total_size = cpu_to_le64(m->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);
dout("client%llu send metrics to mds%d\n",
ceph_client_gid(mdsc->fsc->client), s->s_mds);
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)
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)
{
int ret;
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;
spin_lock_init(&m->read_metric_lock);
m->read_latency_sq_sum = 0;
m->read_latency_min = KTIME_MAX;
m->read_latency_max = 0;
m->total_reads = 0;
m->read_latency_sum = 0;
m->read_size_min = U64_MAX;
m->read_size_max = 0;
m->read_size_sum = 0;
spin_lock_init(&m->write_metric_lock);
m->write_latency_sq_sum = 0;
m->write_latency_min = KTIME_MAX;
m->write_latency_max = 0;
m->total_writes = 0;
m->write_latency_sum = 0;
m->write_size_min = U64_MAX;
m->write_size_max = 0;
m->write_size_sum = 0;
spin_lock_init(&m->metadata_metric_lock);
m->metadata_latency_sq_sum = 0;
m->metadata_latency_min = KTIME_MAX;
m->metadata_latency_max = 0;
m->total_metadatas = 0;
m->metadata_latency_sum = 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_stdev(ktime_t total, ktime_t lsum,
ktime_t *sq_sump, ktime_t lat)
{
ktime_t avg, sq;
if (unlikely(total == 1))
return;
/* the sq is (lat - old_avg) * (lat - new_avg) */
avg = DIV64_U64_ROUND_CLOSEST((lsum - lat), (total - 1));
sq = lat - avg;
avg = DIV64_U64_ROUND_CLOSEST(lsum, total);
sq = sq * (lat - avg);
*sq_sump += sq;
}
void ceph_update_read_metrics(struct ceph_client_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->read_metric_lock);
total = ++m->total_reads;
m->read_size_sum += size;
m->read_latency_sum += lat;
METRIC_UPDATE_MIN_MAX(m->read_size_min,
m->read_size_max,
size);
METRIC_UPDATE_MIN_MAX(m->read_latency_min,
m->read_latency_max,
lat);
__update_stdev(total, m->read_latency_sum,
&m->read_latency_sq_sum, lat);
spin_unlock(&m->read_metric_lock);
}
void ceph_update_write_metrics(struct ceph_client_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 && rc != -ETIMEDOUT))
return;
spin_lock(&m->write_metric_lock);
total = ++m->total_writes;
m->write_size_sum += size;
m->write_latency_sum += lat;
METRIC_UPDATE_MIN_MAX(m->write_size_min,
m->write_size_max,
size);
METRIC_UPDATE_MIN_MAX(m->write_latency_min,
m->write_latency_max,
lat);
__update_stdev(total, m->write_latency_sum,
&m->write_latency_sq_sum, lat);
spin_unlock(&m->write_metric_lock);
}
void ceph_update_metadata_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
int rc)
{
ktime_t lat = ktime_sub(r_end, r_start);
ktime_t total;
if (unlikely(rc && rc != -ENOENT))
return;
spin_lock(&m->metadata_metric_lock);
total = ++m->total_metadatas;
m->metadata_latency_sum += lat;
METRIC_UPDATE_MIN_MAX(m->metadata_latency_min,
m->metadata_latency_max,
lat);
__update_stdev(total, m->metadata_latency_sum,
&m->metadata_latency_sq_sum, lat);
spin_unlock(&m->metadata_metric_lock);
}
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