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: Tim Murray <timmurray@google.com> Bug: 25392275 Change-Id: I589149a31c7b5d322fe2ed5b2476b1f6e3d5ee6f
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1 changed files with 12 additions and 3 deletions
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@ -1864,16 +1864,25 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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}
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ret = -ENOMEM;
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cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1);
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cc->io_queue = alloc_workqueue("kcryptd_io",
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WQ_HIGHPRI |
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WQ_NON_REENTRANT|
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WQ_MEM_RECLAIM,
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1);
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if (!cc->io_queue) {
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ti->error = "Couldn't create kcryptd io queue";
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goto bad;
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}
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if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
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cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
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cc->crypt_queue = alloc_workqueue("kcryptd",
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WQ_HIGHPRI |
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WQ_MEM_RECLAIM, 1);
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else
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cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
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cc->crypt_queue = alloc_workqueue("kcryptd",
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WQ_HIGHPRI |
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WQ_MEM_RECLAIM |
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WQ_UNBOUND,
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num_online_cpus());
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if (!cc->crypt_queue) {
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ti->error = "Couldn't create kcryptd queue";
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