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

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Date:	Tue, 31 Jul 2012 17:41:51 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.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 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.

Jan

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