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ceph: add metadata perf metric support

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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>
This commit is contained in:
Xiubo Li
2020-03-19 23:45:02 -04:00
committed by Ilya Dryomov
parent 97e27aaa9a
commit 70c948206f
5 changed files with 53 additions and 0 deletions
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23
fs/ceph/metric.c
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@@ -44,6 +44,13 @@ int ceph_metric_init(struct ceph_client_metric *m)
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:
@@ -123,3 +130,19 @@ void ceph_update_write_latency(struct ceph_client_metric *m,
&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);
}