From b2357167e5059276ab3eb58038437f20de09a35a Mon Sep 17 00:00:00 2001 From: Tim Murray Date: Fri, 21 Apr 2017 11:11:36 +0200 Subject: [PATCH] dm crypt: use WQ_HIGHPRI for the IO and crypt workqueues Running dm-crypt with workqueues at the standard priority results in IO competing for CPU time with standard user apps, which can lead to pipeline bubbles and seriously degraded performance. Move to using WQ_HIGHPRI workqueues to protect against that. Signed-off-by: Tim Murray Signed-off-by: Enric Balletbo i Serra Signed-off-by: Mike Snitzer --- drivers/md/dm-crypt.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index bb2e747907b08..64c5022449ee4 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -2749,16 +2749,17 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) } ret = -ENOMEM; - cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); + cc->io_queue = alloc_workqueue("kcryptd_io", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); if (!cc->io_queue) { ti->error = "Couldn't create kcryptd io queue"; goto bad; } if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) - cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); + cc->crypt_queue = alloc_workqueue("kcryptd", WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); else - cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, + cc->crypt_queue = alloc_workqueue("kcryptd", + WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, num_online_cpus()); if (!cc->crypt_queue) { ti->error = "Couldn't create kcryptd queue"; -- 2.39.5