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block: queue work on power efficient wq

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Block layer uses workqueues for multiple purposes. There is no real dependency
of scheduling these on the cpu which scheduled them.

On a idle system, it is observed that and idle cpu wakes up many times just to
service this work. It would be better if we can schedule it on a cpu which the
scheduler believes to be the most appropriate one.

This patch replaces normal workqueues with power efficient versions.

Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: v4lkyr <valkyr23@gmail.com>
Signed-off-by: Zlatan Radovanovic <zlatan.radovanovic@fet.ba>
Signed-off-by: forenche <prahul2003@gmail.com>
Signed-off-by: Adithya R <gh0strider.2k18.reborn@gmail.com>
Signed-off-by: Forenche <prahul2003@gmail.com>
This commit is contained in:
Viresh Kumar 2021-06-13 21:22:50 +08:00 committed by Forenche
parent 371b06c93f
commit 3f47c3f2be
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1 changed files with 2 additions and 1 deletions
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block/blk-core.c
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@ -3772,7 +3772,8 @@ int __init blk_dev_init(void)
/* used for unplugging and affects IO latency/throughput - HIGHPRI */
kblockd_workqueue = alloc_workqueue("kblockd",
WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
WQ_MEM_RECLAIM | WQ_HIGHPRI |
WQ_POWER_EFFICIENT, 0);
if (!kblockd_workqueue)
panic("Failed to create kblockd\n");