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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-core.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-core.c')
| -rw-r--r-- | block/blk-core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 33c33bc99ddd..f0deb8bf89e1 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -3180,7 +3180,8 @@ 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"); |