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block: make kblockd_workqueue smarter 

kblockd is used for unplugging and may affect IO latency and
throughput and the max number of concurrent work items are bound by
the number of block devices.  Make it HIGHPRI workqueue w/ default max
concurrency.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Tejun Heo 2011-01-03 15:01:47 +01:00 committed by Jens Axboe
parent 27667c996f
commit 89b90be2d8
1 changed files with 3 additions and 1 deletions
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4
block/blk-core.c
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@ -2606,7 +2606,9 @@ int __init blk_dev_init(void)
BUILD_BUG_ON(__REQ_NR_BITS > 8 * BUILD_BUG_ON(__REQ_NR_BITS > 8 *
sizeof(((struct request *)0)->cmd_flags)); sizeof(((struct request *)0)->cmd_flags));
kblockd_workqueue = create_workqueue("kblockd"); /* used for unplugging and affects IO latency/throughput - HIGHPRI */
kblockd_workqueue = alloc_workqueue("kblockd",
WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
if (!kblockd_workqueue) if (!kblockd_workqueue)
panic("Failed to create kblockd\n"); panic("Failed to create kblockd\n");