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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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7
fs/ceph/mds_client.c
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@@ -10,6 +10,7 @@
#include <linux/seq_file.h>
#include <linux/ratelimit.h>
#include <linux/bits.h>
#include <linux/ktime.h>
#include "super.h"
#include "mds_client.h"
@@ -2201,6 +2202,7 @@ ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
mutex_init(&req->r_fill_mutex);
req->r_mdsc = mdsc;
req->r_started = jiffies;
req->r_start_latency = ktime_get();
req->r_resend_mds = -1;
INIT_LIST_HEAD(&req->r_unsafe_dir_item);
INIT_LIST_HEAD(&req->r_unsafe_target_item);
@@ -2547,6 +2549,8 @@ out:
static void complete_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
req->r_end_latency = ktime_get();
if (req->r_callback)
req->r_callback(mdsc, req);
complete_all(&req->r_completion);
@@ -3155,6 +3159,9 @@ out_err:
/* kick calling process */
complete_request(mdsc, req);
ceph_update_metadata_latency(&mdsc->metric, req->r_start_latency,
req->r_end_latency, err);
out:
ceph_mdsc_put_request(req);
return;