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| author | Kemeng Shi <shikemeng@huawei.com> | 2022-12-05 12:57:03 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-12-05 21:44:34 +0100 |
| commit | eb184791821409c37fef4f67638bb56bdaa82900 (patch) | |
| tree | af823af30b990b633edf841d3011ca3ee5988d89 /Kbuild | |
| parent | blk-throttle: Fix that bps of child could exceed bps limited in parent (diff) | |
| download | linux-eb184791821409c37fef4f67638bb56bdaa82900.tar.xz linux-eb184791821409c37fef4f67638bb56bdaa82900.zip | |
blk-throttle: ignore cgroup without io queued in blk_throtl_cancel_bios
Ignore cgroup without io queued in blk_throtl_cancel_bios for two
reasons:
1. Save cpu cycle for trying to dispatch cgroup which is no io queued.
2. Avoid non-consistent state that cgroup is inserted to service queue
without THROTL_TG_PENDING set as tg_update_disptime will unconditional
re-insert cgroup to service queue. If we are on the default hierarchy,
IO dispatched from child in tg_dispatch_one_bio will trigger inserting
cgroup to service queue without erase first and ruin the tree.
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Kemeng Shi <shikemeng@huawei.com>
Link: https://lore.kernel.org/r/20221205115709.251489-4-shikemeng@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Kbuild')
0 files changed, 0 insertions, 0 deletions