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f959325e6a
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:
|
||
|---|---|---|
| .. | ||
| enable.c | ||
| fsverity_private.h | ||
| hash_algs.c | ||
| init.c | ||
| Kconfig | ||
| Makefile | ||
| measure.c | ||
| open.c | ||
| read_metadata.c | ||
| signature.c | ||
| verify.c | ||