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authorMichael Callahan <michaelcallahan@fb.com>2018-07-18 04:47:40 -0700
committerJens Axboe <axboe@kernel.dk>2018-07-18 08:44:22 -0600
commitbdca3c87fb7ad1cc61d231d37eb0d8f90d001e0c (patch)
treea5890cef3e0fb586f2a2b2a366423e71af96d821 /Documentation/ABI
parentddcf35d397976421a4ec1d0d00fbcc027a8cb034 (diff)
downloadlinux-bdca3c87fb7ad1cc61d231d37eb0d8f90d001e0c.tar.bz2
block: Track DISCARD statistics and output them in stat and diskstat
Add tracking of REQ_OP_DISCARD ios to the partition statistics and append them to the various stat files in /sys as well as /proc/diskstats. These are tracked with the same four stats as reads and writes: Number of discard ios completed. Number of discard ios merged Number of discard sectors completed Milliseconds spent on discard requests This is done via adding a new STAT_DISCARD define to genhd.h and then using it to index that stat field for discard requests. tj: Refreshed on top of v4.17 and other previous updates. Signed-off-by: Michael Callahan <michaelcallahan@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Andy Newell <newella@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/procfs-diskstats10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/procfs-diskstats b/Documentation/ABI/testing/procfs-diskstats
index f91a973a37fe..abac31d216de 100644
--- a/Documentation/ABI/testing/procfs-diskstats
+++ b/Documentation/ABI/testing/procfs-diskstats
@@ -5,6 +5,7 @@ Description:
The /proc/diskstats file displays the I/O statistics
of block devices. Each line contains the following 14
fields:
+
1 - major number
2 - minor mumber
3 - device name
@@ -19,4 +20,13 @@ Description:
12 - I/Os currently in progress
13 - time spent doing I/Os (ms)
14 - weighted time spent doing I/Os (ms)
+
+ Kernel 4.18+ appends four more fields for discard
+ tracking putting the total at 18:
+
+ 15 - discards completed successfully
+ 16 - discards merged
+ 17 - sectors discarded
+ 18 - time spent discarding
+
For more details refer to Documentation/iostats.txt