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blkcg: Track DISCARD statistics and output them in cgroup io.stat

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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>
This commit is contained in:
Tejun Heo
2018-07-18 04:47:41 -07:00
committed by Jens Axboe
parent bdca3c87fb
commit 636620b66d
3 changed files with 19 additions and 9 deletions
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10
Documentation/admin-guide/cgroup-v2.rst
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@@ -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.