Re: Linux 2.6.24.4+mmap with overcommit >= 1

From: Sami Farin
Date: Wed Apr 30 2008 - 10:12:54 EST


On Wed, Apr 30, 2008 at 14:47:38 +0300, Sami Farin wrote:
> On Wed, Apr 30, 2008 at 11:24:53 +0100, Alan Cox wrote:
> > On Wed, 30 Apr 2008 04:19:54 +0300
> > Sami Farin <safari-kernel@xxxxxxxxxxxxx> wrote:
> >
> > > I have arch x86_64, glibc-2.7.90-7 from Fedora.
> > > When I have vm.overcommit_memory == 1 or 2,
> > > mmap succeeds for really huge values.
> > > These ranges succeed (approximate):
> > > 8793870000000 - 17500387000000
> > > 26390387000000 - 35180387000000
> >
> > Fun fun fun
> >
> > This should fix strict overcommit (== 2) I think
>
> Thanks, one more reason to boot to 2.6.24.5...
>
> This patch needed, too, I guess.

Booted. Works great.

$ ./a.out 30390387000000
trying 30390387000000 bytes... got (nil)

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