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Re: [PATCH] aio-posix: avoid reacquiring rcu_read_lock() when polling
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [PATCH] aio-posix: avoid reacquiring rcu_read_lock() when polling |
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Date: |
Fri, 21 Feb 2020 13:34:54 +0000 |
On Tue, Feb 18, 2020 at 06:27:08PM +0000, Stefan Hajnoczi wrote:
> The first rcu_read_lock/unlock() is expensive. Nested calls are cheap.
>
> This optimization increases IOPS from 73k to 162k with a Linux guest
> that has 2 virtio-blk,num-queues=1 and 99 virtio-blk,num-queues=32
> devices.
>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
> util/aio-posix.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block
Stefan
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