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| author |   Tejun Heo <tj@kernel.org> | 2018-07-18 04:47:41 -0700 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2018-07-18 08:44:23 -0600 |
| commit | 636620b66d5d4012c4a9c86206013964d3986c4f (patch) | |
| tree | 89ecba6057c7ca99ee3a500438a6281b7c261faf /Documentation/admin-guide | |
| parent | block: Track DISCARD statistics and output them in stat and diskstat (diff) | |
| download | linux-dev-636620b66d5d4012c4a9c86206013964d3986c4f.tar.xz linux-dev-636620b66d5d4012c4a9c86206013964d3986c4f.zip | |
blkcg: Track DISCARD statistics and output them in cgroup io.stat
Add tracking of REQ_OP_DISCARD ios to the per-cgroup io.stat. Two
fields, dbytes and dios, to respectively count the total bytes and
number of discards are added.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Andy Newell <newella@fb.com>
Cc: Michael Callahan <michaelcallahan@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 569ce27b85e5..3afe10fa82bc 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1317,17 +1317,19 @@ IO Interface Files Lines are keyed by $MAJ:$MIN device numbers and not ordered. The following nested keys are defined. - ====== =================== + ====== ===================== rbytes Bytes read wbytes Bytes written rios Number of read IOs wios Number of write IOs - ====== =================== + dbytes Bytes discarded + dios Number of discard IOs + ====== ===================== An example read output follows: - 8:16 rbytes=1459200 wbytes=314773504 rios=192 wios=353 - 8:0 rbytes=90430464 wbytes=299008000 rios=8950 wios=1252 + 8:16 rbytes=1459200 wbytes=314773504 rios=192 wios=353 dbytes=0 dios=0 + 8:0 rbytes=90430464 wbytes=299008000 rios=8950 wios=1252 dbytes=50331648 dios=3021 io.weight A read-write flat-keyed file which exists on non-root cgroups. |