From: Gerd Hoffmann <kraxel@redhat.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: kvm-devel <kvm@vger.kernel.org>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool
Date: Thu, 11 Dec 2008 18:20:09 +0100 [thread overview]
Message-ID: <49414BC9.5090905@redhat.com> (raw)
In-Reply-To: <20081211164947.GD6809@random.random>
Andrea Arcangeli wrote:
> On Thu, Dec 11, 2008 at 05:11:08PM +0100, Gerd Hoffmann wrote:
>> Yes. But kernel aio requires O_DIRECT, so aio users are affected
>> nevertheless.
>
> Are you sure? It surely wasn't the case...
Tons of docs say so, but might be they are wrong, I didn't check.
>> Kernel side looks easy, attached patch + syscall table windup in all
>> archs ...
>
> So should we depend on this?
I suspect we will end up with multiple implementations anyway.
So one could be preadv+threads. Probably quite portable if we manage to
get the syscalls into linux kernel and glibc. All *BSDs have it
already, for solaris I've found a feature request on that. Dunno for MacOS.
Additionally we could have OS-specific bits such as linux-aio. Maybe
also posix-aio for the *BSD family in case their kernel support for that
is better than what glibc provides (i.e. can handle multiple requests in
parallel without the fdpool hack).
cheers,
Gerd
next prev parent reply other threads:[~2008-12-11 17:20 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-05 21:21 [Qemu-devel] [RFC] Replace posix-aio with custom thread pool Anthony Liguori
2008-12-06 9:03 ` Blue Swirl
2008-12-06 18:26 ` Jamie Lokier
2008-12-08 18:23 ` Anthony Liguori
2008-12-09 15:51 ` Gerd Hoffmann
2008-12-09 16:01 ` Anthony Liguori
2008-12-10 16:44 ` Andrea Arcangeli
2008-12-10 17:21 ` Anthony Liguori
2008-12-10 17:29 ` Gerd Hoffmann
2008-12-10 18:50 ` Anthony Liguori
2008-12-10 19:08 ` Andrea Arcangeli
2008-12-11 13:12 ` Andrea Arcangeli
2008-12-11 15:24 ` Gerd Hoffmann
2008-12-11 15:53 ` Andrea Arcangeli
2008-12-11 16:11 ` Gerd Hoffmann
2008-12-11 16:49 ` Andrea Arcangeli
2008-12-11 17:20 ` Gerd Hoffmann [this message]
2008-12-11 18:11 ` Andrea Arcangeli
2008-12-11 20:38 ` Gerd Hoffmann
2008-12-11 20:40 ` Anthony Liguori
2008-12-12 8:23 ` Jens Axboe
2008-12-12 11:51 ` Andrea Arcangeli
2008-12-12 11:54 ` Jens Axboe
2008-12-12 14:13 ` Andrea Arcangeli
2008-12-12 14:24 ` Anthony Liguori
2008-12-12 16:33 ` Chris Wright
2008-12-12 16:51 ` Anthony Liguori
2008-12-12 16:52 ` Chris Wright
2008-12-11 21:32 ` Christoph Hellwig
2008-12-12 0:27 ` Andrea Arcangeli
2008-12-11 21:30 ` Christoph Hellwig
2008-12-11 16:41 ` Anthony Liguori
2008-12-12 14:24 ` Andrea Arcangeli
2008-12-12 14:35 ` Anthony Liguori
2008-12-12 15:44 ` Andrea Arcangeli
2008-12-12 16:49 ` Anthony Liguori
2008-12-12 17:09 ` Andrea Arcangeli
2008-12-12 17:25 ` Anthony Liguori
2008-12-12 17:52 ` Andrea Arcangeli
2008-12-12 18:17 ` Anthony Liguori
2008-12-12 18:26 ` Andrea Arcangeli
2008-12-12 20:12 ` Gerd Hoffmann
2008-12-12 20:17 ` Anthony Liguori
2008-12-12 20:35 ` Gerd Hoffmann
2008-12-09 17:16 ` Avi Kivity
2008-12-17 14:44 ` Ian Jackson
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