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| author | Stefan Hajnoczi | 2020-03-05 18:08:01 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi | 2020-03-09 17:41:31 +0100 |
| commit | 3aa221b382c9b36db1750ef5ed340b6566aacb8c (patch) | |
| tree | bdc6ceb75661f05b66ab4b77e9a4a59c0da1e490 /include/block | |
| parent | aio-posix: completely stop polling when disabled (diff) | |
| download | qemu-3aa221b382c9b36db1750ef5ed340b6566aacb8c.tar.gz qemu-3aa221b382c9b36db1750ef5ed340b6566aacb8c.tar.xz qemu-3aa221b382c9b36db1750ef5ed340b6566aacb8c.zip | |
aio-posix: move RCU_READ_LOCK() into run_poll_handlers()
Now that run_poll_handlers_once() is only called by run_poll_handlers()
we can improve the CPU time profile by moving the expensive
RCU_READ_LOCK() out of the polling loop.
This reduces the run_poll_handlers() from 40% CPU to 10% CPU in perf's
sampling profiler output.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Link: https://lore.kernel.org/r/20200305170806.1313245-3-stefanha@redhat.com
Message-Id: <20200305170806.1313245-3-stefanha@redhat.com>
Diffstat (limited to 'include/block')
0 files changed, 0 insertions, 0 deletions