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linux/fs/verity
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Nathan Huckleberry 0bfadbbcd7 fsverity: Remove WQ_UNBOUND from fsverity read workqueue 
commit f959325e6a upstream.

WQ_UNBOUND causes significant scheduler latency on ARM64/Android.  This
is problematic for latency sensitive workloads, like I/O
post-processing.

Removing WQ_UNBOUND gives a 96% reduction in fsverity workqueue related
scheduler latency and improves app cold startup times by ~30ms.
WQ_UNBOUND was also removed from the dm-verity workqueue for the same
reason [1].

This code was tested by running Android app startup benchmarks and
measuring how long the fsverity workqueue spent in the runnable state.

Before
Total workqueue scheduler latency: 553800us
After
Total workqueue scheduler latency: 18962us

[1]: https://lore.kernel.org/all/20230202012348.885402-1-nhuck@google.com/

Signed-off-by: Nathan Huckleberry <nhuck@google.com>
Fixes: 8a1d0f9cac ("fs-verity: add data verification hooks for ->readpages()")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230310193325.620493-1-nhuck@google.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-03-30 12:47:56 +02:00
..
enable.c fs-verity: fix signed integer overflow with i_size near S64_MAX 2021-09-22 10:56:34 -07:00
fsverity_private.h fs-verity: don't pass whole descriptor to fsverity_verify_signature() 2021-02-07 14:51:09 -08:00
hash_algs.c fs-verity: remove filenames from file comments 2020-11-16 11:40:10 -08:00
init.c fs-verity: remove filenames from file comments 2020-11-16 11:40:10 -08:00
Kconfig fsverity: relax build time dependency on CRYPTO_SHA256 2021-04-22 17:31:32 +10:00
Makefile fs-verity: add FS_IOC_READ_VERITY_METADATA ioctl 2021-02-07 14:51:11 -08:00
measure.c fs-verity: rename "file measurement" to "file digest" 2020-11-16 11:40:12 -08:00
open.c fs-verity: fix signed integer overflow with i_size near S64_MAX 2021-09-22 10:56:34 -07:00
read_metadata.c fs-verity: support reading signature with ioctl 2021-02-07 14:51:19 -08:00
signature.c fs-verity: don't pass whole descriptor to fsverity_verify_signature() 2021-02-07 14:51:09 -08:00
verify.c fsverity: Remove WQ_UNBOUND from fsverity read workqueue 2023-03-30 12:47:56 +02:00