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authorViresh Kumar <viresh.kumar@linaro.org>2013-04-24 17:12:56 +0530
committerTejun Heo <tj@kernel.org>2013-05-14 10:50:07 -0700
commit695588f9454bdbc7c1a2fbb8a6bfdcfba6183348 (patch)
tree4a9963696a82937133acaa8ea682c88ff3d798af /block/blk-core.c
parentbbb47bdeae756f04b896b55b51f230f3eb21f207 (diff)
downloadlinux-linaro-stable-695588f9454bdbc7c1a2fbb8a6bfdcfba6183348.tar.gz
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.c3
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");