linux-kernel - Re: [Xen-devel] [PATCH] extend_brk and fixes to users of extend

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Message-ID: <20120731172916.GD29533@phenom.dumpdata.com>
Date:	Tue, 31 Jul 2012 13:29:16 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	Ian.Campbell@...rix.com, x86@...nel.org,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH] extend_brk and fixes to users of extend_brk
 (v1).

On Tue, Jul 31, 2012 at 05:41:51PM +0100, Jan Beulich wrote:
> >>> On 31.07.12 at 18:15, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> > On Tue, Jul 31, 2012 at 08:49:21AM -0700, H. Peter Anvin wrote:
> >> This means you're either abusing the brk allocator to do something
> >> it is not meant to do... which may mean you can a failure in *other*
> >> code, or you have a bug in your code that you haven't fixed.
> > 
> > Its the latter - and of one of the patches in this patchset fixes that.
> 
> But then you also can't assume that fitting a 2Gb MMIO hole will
> suffice; I have a machine here that I can configure to have a
> 3Gb hole, so I think you really need to be on the safe side and
> allow to cover all the way up to 4Gb with the space you reserve.

I have a patch to address that were the P2M leafs are re-used (the
ones that either full of 1:1 PFNs or INVALID_P2M_ENTRY). But
somehow its hitting a bug..
> 
> Jan
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