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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 <[email protected]>
Signed-off-by: Viresh Kumar <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Viresh Kumar 2013-04-24 17:12:56 +05:30 • committed by Tejun Heo
commit 695588f945
3 changed files with 12 additions and 6 deletions
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3
block/blk-ioc.c
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@ -144,7 +144,8 @@ void put_io_context(struct io_context *ioc)
if (atomic_long_dec_and_test(&ioc->refcount)) {
spin_lock_irqsave(&ioc->lock, flags);
if (!hlist_empty(&ioc->icq_list))
schedule_work(&ioc->release_work);
queue_work(system_power_efficient_wq,
&ioc->release_work);
else
free_ioc = true;
spin_unlock_irqrestore(&ioc->lock, flags);