tree cc34ba226bc715dac52a87025351d3ae5e8d1465
parent 1af16d547f3080d71060092d22e79a34527d1d08
author Xiubo Li <xiubli@redhat.com> 1584675901 -0400
committer Ilya Dryomov <idryomov@gmail.com> 1591010571 +0200

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>