From: Gerd Hoffmann <kraxel@redhat.com>
To: Ryan Harper <ryanh@us.ibm.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] Re: [PATCH 2/3] Move aio implementation out of raw block driver
Date: Tue, 23 Sep 2008 16:53:31 +0200 [thread overview]
Message-ID: <48D902EB.8070701@redhat.com> (raw)
In-Reply-To: <20080923143909.GK31395@us.ibm.com>
Ryan Harper wrote:
>> So what happens if !defined(CONFIG_AIO)? By my reading of the code,
>> aio_drv will be NULL and this will SEGV.
>
> raw_aio_read/write/cancel aren't included in the bdrv structure unless
> CONFIG_AIO is defined. Rather in bdrv_register, the aio emulation
> functions are used instead.
How about providing a aio interface implementation which simply uses
read/write syscalls (thereby not being really async obviously)? Then
use that as fallback instead of aio emulation? And also drop CONFIG_AIO
then?
cheers,
Gerd
next prev parent reply other threads:[~2008-09-23 14:53 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-22 23:17 [Qemu-devel] [PATCH 0/3] Refactor AIO to allow multiple AIO implementations Ryan Harper
2008-09-22 23:17 ` [Qemu-devel] [PATCH 1/3] Only call aio flush handler if set Ryan Harper
2008-09-23 2:38 ` [Qemu-devel] " Anthony Liguori
2008-09-23 14:26 ` Ryan Harper
2008-09-23 14:34 ` Anthony Liguori
2008-09-23 14:41 ` Ryan Harper
2008-09-23 14:50 ` Anthony Liguori
2008-09-22 23:17 ` [Qemu-devel] [PATCH 2/3] Move aio implementation out of raw block driver Ryan Harper
2008-09-23 1:16 ` [Qemu-devel] " Ryan Harper
2008-09-23 2:45 ` Anthony Liguori
2008-09-23 14:39 ` Ryan Harper
2008-09-23 14:40 ` Anthony Liguori
2008-09-23 14:53 ` Gerd Hoffmann [this message]
2008-09-23 16:06 ` Anthony Liguori
2008-09-23 18:04 ` Gerd Hoffmann
2008-09-23 18:28 ` Anthony Liguori
2008-09-24 22:31 ` Marcelo Tosatti
2008-09-22 23:17 ` [Qemu-devel] " Ryan Harper
2008-09-23 1:22 ` [Qemu-devel] [PATCH 3/3] Add linux aio implementation for raw block devices Ryan Harper
2008-09-23 3:32 ` [Qemu-devel] Re: [PATCH 0/3] Refactor AIO to allow multiple AIO implementations Anthony Liguori
2008-09-23 14:43 ` Ryan Harper
2008-09-23 14:47 ` Anthony Liguori
2008-09-23 16:09 ` Anthony Liguori
2008-09-23 10:27 ` [Qemu-devel] " Jamie Lokier
2008-10-02 22:41 ` [Qemu-devel] " john cooper
2008-10-03 13:33 ` Ryan Harper
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=48D902EB.8070701@redhat.com \
--to=kraxel@redhat.com \
--cc=aliguori@us.ibm.com \
--cc=kvm@vger.kernel.org \
--cc=mtosatti@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=ryanh@us.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).