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linux/block/blk-iolatency.c
Hongnan Li 6e2fa4dd68 blk-iolatency: only call ktime_get() if needed 
ktime_to_ns(ktime_get()), which is expensive, does not need to be called
if blk_iolatency_enabled() return false in blkcg_iolatency_done_bio().
Postponing ktime_to_ns(ktime_get()) execution reduces the CPU usage when
blk_iolatency is disabled.

Signed-off-by: Hongnan Li <hongnan.li@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-07-01 08:02:38 -06:00

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