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| author | Xiubo Li <xiubli@redhat.com> | 2020-03-19 23:45:01 -0400 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2020-06-01 13:22:51 +0200 |
| commit | 97e27aaa9a2cbd6238c66b3251d397e0eacc9968 (patch) | |
| tree | cc34ba226bc715dac52a87025351d3ae5e8d1465 /net/ceph | |
| parent | 1af16d547f3080d71060092d22e79a34527d1d08 (diff) | |
| download | lwn-97e27aaa9a2cbd6238c66b3251d397e0eacc9968.tar.gz lwn-97e27aaa9a2cbd6238c66b3251d397e0eacc9968.zip | |
ceph: add read/write latency metric support
Calculate the latency for OSD read requests. Add a new r_end_stamp
field to struct ceph_osd_request that will hold the time of that
the reply was received. Use that to calculate the RTT for each call,
and divide the sum of those by number of calls to get averate RTT.
Keep a tally of RTT for OSD writes and number of calls to track average
latency of OSD writes.
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>
Diffstat (limited to 'net/ceph')
| -rw-r--r-- | net/ceph/osd_client.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 1d4973f8cd7a..ece124a5138e 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -2373,6 +2373,7 @@ static void account_request(struct ceph_osd_request *req) atomic_inc(&req->r_osdc->num_requests); req->r_start_stamp = jiffies; + req->r_start_latency = ktime_get(); } static void submit_request(struct ceph_osd_request *req, bool wrlocked) @@ -2389,6 +2390,8 @@ static void finish_request(struct ceph_osd_request *req) WARN_ON(lookup_request_mc(&osdc->map_checks, req->r_tid)); dout("%s req %p tid %llu\n", __func__, req, req->r_tid); + req->r_end_latency = ktime_get(); + if (req->r_osd) unlink_request(req->r_osd, req); atomic_dec(&osdc->num_requests); |