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| author | Konstantin Khlebnikov <[email protected]> | 2019-07-08 15:29:57 +0000 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2019-07-10 15:00:57 +0000 |
| commit | 3a10f999ffd464d01c5a05592a15470a3c4bbc36 (patch) | |
| tree | 84008b527c89f973b57d8f8a9fb1721a7004e4e7 /tools/perf/scripts/python/futex-contention.py | |
| parent | block: Fix potential overflow in blk_report_zones() (diff) | |
| download | kernel-3a10f999ffd464d01c5a05592a15470a3c4bbc36.tar.gz kernel-3a10f999ffd464d01c5a05592a15470a3c4bbc36.zip | |
blk-throttle: fix zero wait time for iops throttled group
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 <[email protected]>
Cc: [email protected] # v4.19+
Signed-off-by: Jens Axboe <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/futex-contention.py')
0 files changed, 0 insertions, 0 deletions