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authorTejun Heo <tj@kernel.org>2011-01-03 15:01:47 +0100
committerJens Axboe <jaxboe@fusionio.com>2011-01-03 15:01:47 +0100
commit89b90be2d877a904b1704e4029db65655bfc6282 (patch)
tree0dbeda7f0efa17373bdd3c59793a36c417fa9d1c /block
parent27667c996f6a0bed4ad1e10ac0a0dbb6037968db (diff)
downloadlinux-linaro-precise-89b90be2d877a904b1704e4029db65655bfc6282.tar.gz
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>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 151070541e2..3689319a597 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2606,7 +2606,9 @@ int __init blk_dev_init(void)
BUILD_BUG_ON(__REQ_NR_BITS > 8 *
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)
panic("Failed to create kblockd\n");