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blk-throttle: only enable blk-stat when BLK_DEV_THROTTLING_LOW 

blk_throtl_register() will unconditionally enable blk-stat for gendisk
when register, even when we have no BLK_DEV_THROTTLING_LOW config.

Since the kernel always has only BLK_DEV_THROTTLING config and the
BLK_DEV_THROTTLING_LOW config is still in EXPERIMENTAL state, we can
just skip blk-stat when !BLK_DEV_THROTTLING_LOW.

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230413062805.2081970-2-chengming.zhou@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Chengming Zhou 2023-04-13 14:28:05 +08:00 committed by Jens Axboe
parent 20de765f6d
commit 8e15dfbd9a
1 changed files with 2 additions and 1 deletions
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3
block/blk-throttle.c
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@ -2443,11 +2443,12 @@ void blk_throtl_register(struct gendisk *disk)
#ifndef CONFIG_BLK_DEV_THROTTLING_LOW
/* if no low limit, use previous default */
td->throtl_slice = DFL_THROTL_SLICE_HD;
#endif
#else
td->track_bio_latency = !queue_is_mq(q);
if (!td->track_bio_latency)
blk_stat_enable_accounting(q);
#endif
}
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW