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authorNathan Huckleberry <nhuck@google.com>2023-03-10 20:33:25 +0100
committerEric Biggers <ebiggers@google.com>2023-03-15 00:16:36 +0100
commitf959325e6ac3f499450088b8d9c626d1177be160 (patch)
tree13094210ae796bacada3f6d2410b50512037a4ea /Documentation/riscv
parentLinux 6.3-rc2 (diff)
downloadlinux-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>
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