Right now, cumulative read/write/metadata latencies are tracked
and are periodically forwarded to the MDS. These meterics are not
particularly useful. A much more useful metric is the average latency
and standard deviation (stdev) which is what this series of patches
aims to do.
The userspace (libcephfs+tool) changes are here::
https://github.com/ceph/ceph/pull/41397
Note that the cumulative latencies are still forwarded to the MDS but
the tool (cephfs-top) ignores it altogether.
Latency standard deviation is calculated in `cephfs-top` tool.
Venky Shankar (3):
ceph: track average r/w/m latency
ceph: include average/stdev r/w/m latency in mds metrics
ceph: use tracked average r/w/m latencies to display metrics in
debugfs
fs/ceph/debugfs.c | 2 +-
fs/ceph/metric.c | 44 +++++++++++++++++++++++----------------
fs/ceph/metric.h | 52 +++++++++++++++++++++++++++++++++--------------
3 files changed, 65 insertions(+), 33 deletions(-)
--
2.27.0
