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authorMatias Bjørling <m@bjorling.me>2014-06-11 23:43:54 +0200
committerJens Axboe <axboe@fb.com>2014-06-11 15:53:39 -0600
commit28747fcd2211d0fccbe3d3c91a1067c3744db908 (patch)
tree810f1f10310d3ec6f30aebf0be1b8a1964da58fc /block/blk-core.c
parent54ae81cd5a20d23fdc7906a59d9018e1a760cadc (diff)
downloadkernel-28747fcd2211d0fccbe3d3c91a1067c3744db908.tar.gz
block: remove WQ_POWER_EFFICIENT from kblockd
blk-mq issues async requests through kblockd. To issue a work request on a specific CPU, kblockd_schedule_delayed_work_on is used. However, the specific CPU choice may not be honored, if the power_efficient option for workqueues is set. blk-mq requires that we have strict per-cpu scheduling, so it wont work properly if kblockd is marked POWER_EFFICIENT and power_efficient is set. Remove the kblockd WQ_POWER_EFFICIENT flag to prevent this behavior. This essentially reverts part of commit 695588f9454b, which added the WQ_POWER_EFFICIENT marker to kblockd. Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-core.c')
-rw-r--r--block/blk-core.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 9aca8c71e70b..55f91b88bb14 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -3311,8 +3311,7 @@ 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 |
- WQ_POWER_EFFICIENT, 0);
+ WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
if (!kblockd_workqueue)
panic("Failed to create kblockd\n");