mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Xiubo Li](/assets/img/avatar_default.png)
Add a new "r_ended" field to struct ceph_mds_request and use that to maintain the average latency of MDS requests. URL: https://tracker.ceph.com/issues/43215 Signed-off-by: Xiubo Li <xiubli@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/percpu_counter.h>
|
|
#include <linux/math64.h>
|
|
|
|
#include "metric.h"
|
|
|
|
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;
|
|
|
|
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_latency_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;
|
|
|
|
spin_lock_init(&m->write_latency_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;
|
|
|
|
spin_lock_init(&m->metadata_latency_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;
|
|
|
|
return 0;
|
|
|
|
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;
|
|
|
|
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);
|
|
}
|
|
|
|
static inline void __update_latency(ktime_t *totalp, ktime_t *lsump,
|
|
ktime_t *min, ktime_t *max,
|
|
ktime_t *sq_sump, ktime_t lat)
|
|
{
|
|
ktime_t total, avg, sq, lsum;
|
|
|
|
total = ++(*totalp);
|
|
lsum = (*lsump += lat);
|
|
|
|
if (unlikely(lat < *min))
|
|
*min = lat;
|
|
if (unlikely(lat > *max))
|
|
*max = lat;
|
|
|
|
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_latency(struct ceph_client_metric *m,
|
|
ktime_t r_start, ktime_t r_end,
|
|
int rc)
|
|
{
|
|
ktime_t lat = ktime_sub(r_end, r_start);
|
|
|
|
if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))
|
|
return;
|
|
|
|
spin_lock(&m->read_latency_lock);
|
|
__update_latency(&m->total_reads, &m->read_latency_sum,
|
|
&m->read_latency_min, &m->read_latency_max,
|
|
&m->read_latency_sq_sum, lat);
|
|
spin_unlock(&m->read_latency_lock);
|
|
}
|
|
|
|
void ceph_update_write_latency(struct ceph_client_metric *m,
|
|
ktime_t r_start, ktime_t r_end,
|
|
int rc)
|
|
{
|
|
ktime_t lat = ktime_sub(r_end, r_start);
|
|
|
|
if (unlikely(rc && rc != -ETIMEDOUT))
|
|
return;
|
|
|
|
spin_lock(&m->write_latency_lock);
|
|
__update_latency(&m->total_writes, &m->write_latency_sum,
|
|
&m->write_latency_min, &m->write_latency_max,
|
|
&m->write_latency_sq_sum, lat);
|
|
spin_unlock(&m->write_latency_lock);
|
|
}
|
|
|
|
void ceph_update_metadata_latency(struct ceph_client_metric *m,
|
|
ktime_t r_start, ktime_t r_end,
|
|
int rc)
|
|
{
|
|
ktime_t lat = ktime_sub(r_end, r_start);
|
|
|
|
if (unlikely(rc && rc != -ENOENT))
|
|
return;
|
|
|
|
spin_lock(&m->metadata_latency_lock);
|
|
__update_latency(&m->total_metadatas, &m->metadata_latency_sum,
|
|
&m->metadata_latency_min, &m->metadata_latency_max,
|
|
&m->metadata_latency_sq_sum, lat);
|
|
spin_unlock(&m->metadata_latency_lock);
|
|
}
|