diff options
| author | Breno Leitao <leitao@debian.org> | 2026-01-06 06:26:57 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-01-06 19:08:23 -0700 |
| commit | 7d121d701d58a92f26decb10da1d04a88b74519d (patch) | |
| tree | 86d91f926e43c056431c7809f86a1d611017decb /include/uapi/linux | |
| parent | 08e136ebd193eae7d5eff4c66d576c4a2dabdc3f (diff) | |
blk-rq-qos: Remove unlikely() hints from QoS checks
The unlikely() annotations on QUEUE_FLAG_QOS_ENABLED checks are
counterproductive. Writeback throttling (WBT) might be enabled by
default, mainly because CONFIG_BLK_WBT_MQ defaults to 'y'.
Branch profiling on Meta servers, which have WBT enabled, confirms 100%
misprediction rates on these checks.
Remove the unlikely() annotations to let the CPU's branch predictor
learn the actual behavior, potentially improving I/O path performance.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi/linux')
0 files changed, 0 insertions, 0 deletions