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| author | Viresh Kumar <viresh.kumar@linaro.org> | 2013-04-24 17:12:56 +0530 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-05-14 10:50:07 -0700 |
| commit | 695588f9454bdbc7c1a2fbb8a6bfdcfba6183348 (patch) | |
| tree | 4a9963696a82937133acaa8ea682c88ff3d798af /block/blk-ioc.c | |
| parent | bbb47bdeae756f04b896b55b51f230f3eb21f207 (diff) | |
| download | lwn-695588f9454bdbc7c1a2fbb8a6bfdcfba6183348.tar.gz lwn-695588f9454bdbc7c1a2fbb8a6bfdcfba6183348.zip | |
block: queue work on power efficient wq
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>
Diffstat (limited to 'block/blk-ioc.c')
| -rw-r--r-- | block/blk-ioc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk-ioc.c b/block/blk-ioc.c index 9c4bb8266bc8..4464c823cff2 100644 --- a/block/blk-ioc.c +++ b/block/blk-ioc.c @@ -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); |