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author | Nathan Huckleberry <nhuck@google.com> | 2023-03-10 20:33:25 +0100 |
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committer | Eric Biggers <ebiggers@google.com> | 2023-03-15 00:16:36 +0100 |
commit | f959325e6ac3f499450088b8d9c626d1177be160 (patch) | |
tree | 13094210ae796bacada3f6d2410b50512037a4ea /Documentation/riscv | |
parent | Linux 6.3-rc2 (diff) | |
download | linux-f959325e6ac3f499450088b8d9c626d1177be160.tar.xz linux-f959325e6ac3f499450088b8d9c626d1177be160.zip |
fsverity: Remove WQ_UNBOUND from fsverity read workqueue
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: 8a1d0f9cacc9 ("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>
Diffstat (limited to 'Documentation/riscv')
0 files changed, 0 insertions, 0 deletions