From: Matias Bjørling Date: Wed, 11 Jun 2014 21:43:54 +0000 (+0200) Subject: block: remove WQ_POWER_EFFICIENT from kblockd X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=28747fcd2211d0fccbe3d3c91a1067c3744db908;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Jens Axboe --- 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");