From: Sasha Levin <levinsasha928@gmail.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: mingo@elte.hu, asias.hejun@gmail.com, gorcunov@gmail.com,
prasadjoshi124@gmail.com, kvm@vger.kernel.org
Subject: Re: [PATCH] kvm tools: Add option to specify backing storage for RAM
Date: Thu, 21 Apr 2011 16:00:03 +0300 [thread overview]
Message-ID: <1303390803.3127.4.camel@stimpy> (raw)
In-Reply-To: <BANLkTikrUG0e2nXWU1Ytasm=eVf=FGyY1g@mail.gmail.com>
On Thu, 2011-04-21 at 15:48 +0300, Pekka Enberg wrote:
> On Thu, Apr 21, 2011 at 3:45 PM, Sasha Levin <levinsasha928@gmail.com> wrote:
> > Add --use-backing to allow for the usage of a temporary backing file for guest RAM.
> > A temporary file is created and aollocated under /tmp and is used to back the RAM memory which is mmaped for the guest.
> > There should be enough storage space under /tmp to use this option (at least the size of the guest RAM).
> >
> > Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
>
> OK, but what is this useful for? Why would someone want to do this?
It's an alternative to creating more swap.
When using large RAM sizes for guests on hosts with limited physical
RAM/swap this option gives the user a way to use files instead of swap.
This can also be extended to use hugetlbfs.
--
Sasha.
next prev parent reply other threads:[~2011-04-21 13:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-21 12:45 [PATCH] kvm tools: Add option to specify backing storage for RAM Sasha Levin
2011-04-21 12:48 ` Pekka Enberg
2011-04-21 13:00 ` Sasha Levin [this message]
2011-04-21 13:12 ` Pekka Enberg
2011-04-21 14:08 ` Sasha Levin
2011-04-21 14:12 ` Avi Kivity
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