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authorXiubo Li <xiubli@redhat.com>2020-03-20 06:45:01 +0300
committerIlya Dryomov <idryomov@gmail.com>2020-06-01 14:22:51 +0300
commit97e27aaa9a2cbd6238c66b3251d397e0eacc9968 (patch)
treecc34ba226bc715dac52a87025351d3ae5e8d1465 /net/ceph
parent1af16d547f3080d71060092d22e79a34527d1d08 (diff)
downloadlinux-97e27aaa9a2cbd6238c66b3251d397e0eacc9968.tar.xz
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.c3
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);