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dm-crypt: run in a WQ_HIGHPRI workqueue

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Running dm-crypt in a standard workqueue results in IO competing for CPU
time with standard user apps, which can lead to pipeline bubbles and
seriously degraded performance. Move to a WQ_HIGHPRI workqueue to
protect against that.

bug 25392275

Change-Id: I589149a31c7b5d322fe2ed5b2476b1f6e3d5ee6f
This commit is contained in:
Tim Murray 2016-01-19 16:33:27 -08:00 committed by Artem Borisov
parent 495bd2da4f
commit 0b1a428a1e
1 changed files with 3 additions and 1 deletions
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4
drivers/md/dm-crypt.c
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@ -1639,6 +1639,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
ret = -ENOMEM; ret = -ENOMEM;
cc->io_queue = alloc_workqueue("kcryptd_io", cc->io_queue = alloc_workqueue("kcryptd_io",
WQ_HIGHPRI |
WQ_NON_REENTRANT| WQ_NON_REENTRANT|
WQ_MEM_RECLAIM, WQ_MEM_RECLAIM,
1); 1);
@ -1648,7 +1649,8 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
} }
cc->crypt_queue = alloc_workqueue("kcryptd", cc->crypt_queue = alloc_workqueue("kcryptd",
WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_HIGHPRI |
WQ_MEM_RECLAIM |
WQ_UNBOUND, num_online_cpus()); WQ_UNBOUND, num_online_cpus());
if (!cc->crypt_queue) { if (!cc->crypt_queue) {
ti->error = "Couldn't create kcryptd queue"; ti->error = "Couldn't create kcryptd queue";