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Re: [Qemu-devel] [PATCH 0/2][RFC?] Remove SIGUSR2 from posix-aio

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH 0/2][RFC?] Remove SIGUSR2 from posix-aio
Date: Mon, 19 Sep 2011 15:08:11 +0100

On Mon, Sep 19, 2011 at 12:54 PM, Frediano Ziglio <address@hidden> wrote:
> Now that iothread is always compiled sending a signal seems only an
> additional step. This patch also avoid writing to two pipe (one from signal
> and one in qemu_service_io).
> Tested and works correctly with KVM enabled. Performances are only sligthly
> better (as I expected). strace output is more readable.
> Doubts:
> - any sense having two patches and not only last one?

Personally I would just send one here.

> - is ok if KVM is disabled? more testing required

If I understand correctly it used to interrupt guest code execution
whereas now it simply invoked a callback in the I/O thread.  Normally
this callback will raise a guest interrupt and get the vCPU to notice
that I/O has completed.  So I think this should work.


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