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Re: [Qemu-block] [PATCH] linux-aio: Cancel BH if not needed

From: Stefan Hajnoczi
Subject: Re: [Qemu-block] [PATCH] linux-aio: Cancel BH if not needed
Date: Thu, 16 Jun 2016 17:08:26 +0100
User-agent: Mutt/1.6.1 (2016-04-27)

On Wed, Jun 15, 2016 at 01:16:42PM +0200, Kevin Wolf wrote:
> linux-aio uses a BH in order to make sure that the remaining completions
> are processed even in nested event loops of completion callbacks in
> order to avoid deadlocks.
> There is no need, however, to have the BH overhead for the first call
> into qemu_laio_completion_bh() or after all pending completions have
> already been processed. Therefore, this patch calls directly into
> qemu_laio_completion_bh() in qemu_laio_completion_cb() and cancels
> the BH after qemu_laio_completion_bh() has processed all pending
> completions.
> Signed-off-by: Kevin Wolf <address@hidden>
> ---
>  block/linux-aio.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Reviewed-by: Stefan Hajnoczi <address@hidden>

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