linux-kernel - Re: Linux 2.6.24.4+mmap with overcommit >= 1

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Message-ID: <20080430140604.tic7mhvu35xbjacb@m.safari.iki.fi>
Date:	Wed, 30 Apr 2008 17:06:04 +0300
From:	Sami Farin <safari-kernel@...ari.iki.fi>
To:	Linux kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Linux 2.6.24.4+mmap with overcommit >= 1

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@...ari.iki.fi> 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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