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| author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2019-07-08 18:29:57 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 09:11:10 +0200 |
| commit | a613a7957a05bea2bab9bd54c3af10b23613b5fb (patch) | |
| tree | 81a908abd88de48723c6efa48b01d236abed4a3d /block/Makefile | |
| parent | 3201a60323f05b3600c95f3d41778862b52b5e3b (diff) | |
| download | linux-stable-a613a7957a05bea2bab9bd54c3af10b23613b5fb.tar.gz linux-stable-a613a7957a05bea2bab9bd54c3af10b23613b5fb.tar.bz2 linux-stable-a613a7957a05bea2bab9bd54c3af10b23613b5fb.zip | |
blk-throttle: fix zero wait time for iops throttled group
commit 3a10f999ffd464d01c5a05592a15470a3c4bbc36 upstream.
After commit 991f61fe7e1d ("Blk-throttle: reduce tail io latency when
iops limit is enforced") wait time could be zero even if group is
throttled and cannot issue requests right now. As a result
throtl_select_dispatch() turns into busy-loop under irq-safe queue
spinlock.
Fix is simple: always round up target time to the next throttle slice.
Fixes: 991f61fe7e1d ("Blk-throttle: reduce tail io latency when iops limit is enforced")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block/Makefile')
0 files changed, 0 insertions, 0 deletions