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ANDROID: dm-crypt: run in a WQ_HIGHPRI workqueue

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(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: Tim Murray <timmurray@google.com>
Bug: 25392275
Change-Id: I2828587c754a7c2cafdd78b3323b9896cb8cd4e7
This commit is contained in:
Tim Murray 2016-01-19 16:33:27 -08:00 • committed by Amit Pundir
parent 11b55d5078
commit e9eb108900
1 changed files with 11 additions and 3 deletions
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14
drivers/md/dm-crypt.c
View file

@ -1864,16 +1864,24 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
} }
ret = -ENOMEM; ret = -ENOMEM;
cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); cc->io_queue = alloc_workqueue("kcryptd_io",
WQ_HIGHPRI |
WQ_MEM_RECLAIM,
1);
if (!cc->io_queue) { if (!cc->io_queue) {
ti->error = "Couldn't create kcryptd io queue"; ti->error = "Couldn't create kcryptd io queue";
goto bad; goto bad;
} }
if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) 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 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()); 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";