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| author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2019-06-09 14:14:36 +0300 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2019-06-14 14:46:43 -0600 |
| commit | 9d9b889540c380d8f56f7a79edbaae2fff8684d1 (patch) | |
| tree | 8763e2124944139c266c77a2c9c53869724e9547 /Documentation/fb | |
| parent | 31753202325dd4f9bba27fbbad05f189881c60bc (diff) | |
| download | linux-9d9b889540c380d8f56f7a79edbaae2fff8684d1.tar.gz linux-9d9b889540c380d8f56f7a79edbaae2fff8684d1.tar.bz2 linux-9d9b889540c380d8f56f7a79edbaae2fff8684d1.zip | |
block: document iostat changes for disk busy time accounting
Since commit 5b18b5a73760 ("block: delete part_round_stats and switch to
less precise counting") io_ticks is approximated by adding one at each
start and end of requests if jiffies has changed.
This works perfectly for requests shorter than a jiffy. If requests runs
more than 2 jiffies some I/O time will not be accounted unless there are
other reuqests.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/fb')
0 files changed, 0 insertions, 0 deletions