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block: Track DISCARD statistics and output them in stat and diskstat

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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 <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
Cc: Andy Newell <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Michael Callahan 2018-07-18 04:47:40 -07:00 • committed by Jens Axboe
commit bdca3c87fb
7 changed files with 68 additions and 18 deletions
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10
Documentation/ABI/testing/procfs-diskstats
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@ -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