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Commit 58e425d7 authored by Tim Murray's avatar Tim Murray Committed by Amit Pundir
Browse files

ANDROID: dm-crypt: run in a WQ_HIGHPRI workqueue 



(cherry pick from commit ad3ac5180979e5dd1f84e4a807f76fb9fb19f814)

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.

Signed-off-by: default avatarTim Murray <timmurray@google.com>
Bug: 25392275
Change-Id: I589149a31c7b5d322fe2ed5b2476b1f6e3d5ee6f
parent 8af9b174

drivers/md/dm-crypt.c

+7 −3
Original line number Diff line number Diff line
@@ -1841,16 +1841,20 @@ 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_NON_REENTRANT|

				       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_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_MEM_RECLAIM | WQ_UNBOUND,

						  num_online_cpus());

	if (!cc->crypt_queue) {

		ti->error = "Couldn't create kcryptd queue";