From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:46728)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1X4ZOg-000772-N3
	for qemu-devel@nongnu.org; Tue, 08 Jul 2014 13:41:52 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1X4ZOX-0007Yk-LD
	for qemu-devel@nongnu.org; Tue, 08 Jul 2014 13:41:42 -0400
Received: from mail-qa0-x233.google.com ([2607:f8b0:400d:c00::233]:61911)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1X4ZOX-0007Yf-HN
	for qemu-devel@nongnu.org; Tue, 08 Jul 2014 13:41:33 -0400
Received: by mail-qa0-f51.google.com with SMTP id j7so5087557qaq.24
	for <qemu-devel@nongnu.org>; Tue, 08 Jul 2014 10:41:33 -0700 (PDT)
Sender: Paolo Bonzini <paolo.bonzini@gmail.com>
Message-ID: <53BC2D47.9080605@redhat.com>
Date: Tue, 08 Jul 2014 19:41:27 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
MIME-Version: 1.0
References: <1404834310-12856-1-git-send-email-ming.lei@canonical.com>
In-Reply-To: <1404834310-12856-1-git-send-email-ming.lei@canonical.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH] linux-aio: fix submit aio as a batch
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Ming Lei <ming.lei@canonical.com>, Peter Maydell <peter.maydell@linaro.org>, qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>

Il 08/07/2014 17:45, Ming Lei ha scritto:
>
> -    /* empty io queue */
> -    s->io_q.idx = 0;
> +    ret = io_submit(s->ctx, len, s->io_q.iocbs);
> +    if (ret == -EAGAIN) {
> +        event_notifier_set(&s->retry);
> +        return 0;

You can use a bottom half instead of this event notifier.

Paolo