From: Avi Kivity <avi@qumranet.com>
To: qemu-devel@nongnu.org
Cc: Blue Swirl <blauwirbel@gmail.com>,
Laurent Vivier <Laurent.Vivier@bull.net>,
Andrea Arcangeli <andrea@qumranet.com>,
Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT)
Date: Wed, 21 May 2008 19:48:24 +0300 [thread overview]
Message-ID: <48345258.9040004@qumranet.com> (raw)
In-Reply-To: <20080521162406.GA21501@shareable.org>
Jamie Lokier wrote:
> Anthony Liguori wrote:
>
>> Actually, this is precisely what I'd like to do. The key is to
>> mmap(MAP_PRIVATE) from the underling file directly into the guest's
>> memory. Should be just as applicable to QEMU as KVM (although for KVM
>> we need mmu-notifiers first).
>>
>
> With QEMU, that would lead to a huge number of VMAs - different mmap
> address regions. Linux (or any host for all I know) doesn't handle
> that well.
>
> On Linux you could use remap_file_pages to avoid the VMA problem.
>
>
Hmm, if remap_file_pages() supports MAP_PRIVATE, that solves all the
problems neatly.
Andrea, do you know if that combination works?
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-05-21 16:48 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-20 11:32 [Qemu-devel] [PATCH][v2] Align file accesses with cache=off (O_DIRECT) Laurent Vivier
2008-05-20 19:47 ` [Qemu-devel] " Anthony Liguori
2008-05-20 22:36 ` Jamie Lokier
2008-05-20 22:52 ` Paul Brook
2008-05-20 22:59 ` Laurent Vivier
2008-05-21 0:54 ` Paul Brook
2008-05-21 7:59 ` Laurent Vivier
2008-05-21 0:58 ` Anthony Liguori
2008-05-21 1:04 ` Jamie Lokier
2008-05-21 1:05 ` Anthony Liguori
2008-05-21 8:06 ` Kevin Wolf
2008-05-21 1:05 ` Paul Brook
2008-05-21 1:14 ` Anthony Liguori
2008-05-21 8:24 ` Kevin Wolf
2008-05-21 12:26 ` Jamie Lokier
2008-05-21 12:37 ` Avi Kivity
2008-05-21 13:41 ` Jamie Lokier
2008-05-21 13:55 ` Anthony Liguori
2008-05-21 14:17 ` Avi Kivity
2008-05-21 14:26 ` Anthony Liguori
2008-05-21 14:57 ` Avi Kivity
2008-05-21 15:34 ` Jamie Lokier
2008-05-21 16:02 ` Anthony Liguori
2008-05-21 16:24 ` Jamie Lokier
2008-05-21 16:48 ` Avi Kivity [this message]
2008-05-21 17:01 ` Andrea Arcangeli
2008-05-21 17:18 ` Avi Kivity
2008-05-21 17:47 ` Andrea Arcangeli
2008-05-21 17:53 ` Anthony Liguori
2008-05-21 18:08 ` Andrea Arcangeli
2008-05-21 18:25 ` Anthony Liguori
2008-05-21 20:13 ` Andrea Arcangeli
2008-05-21 20:35 ` Anthony Liguori
2008-05-21 20:42 ` Andrea Arcangeli
2008-05-21 18:29 ` Avi Kivity
2008-05-21 16:45 ` Avi Kivity
2008-05-21 16:44 ` Avi Kivity
2008-05-20 23:04 ` Laurent Vivier
2008-05-20 23:13 ` Jamie Lokier
2008-05-21 1:00 ` Anthony Liguori
2008-05-21 1:19 ` Jamie Lokier
2008-05-21 2:12 ` Anthony Liguori
2008-05-21 8:27 ` Andreas Färber
2008-05-21 14:06 ` Anthony Liguori
2008-05-21 15:31 ` Jamie Lokier
2008-05-21 11:43 ` Jamie Lokier
2008-05-23 9:12 ` Laurent Vivier
2008-05-28 7:01 ` Kevin Wolf
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