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

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Message-ID: <20080430114737.ihnza5eigafftkub@m.safari.iki.fi>
Date:	Wed, 30 Apr 2008 14:47:38 +0300
From:	Sami Farin <safari-kernel@...ari.iki.fi>
To:	Linux kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Linux 2.6.24.4+mmap with overcommit >= 1

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.

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 3462bfd..a208a7b 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -132,7 +132,7 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
 #define K(x) ((x) << (PAGE_SHIFT - 10))
 	si_meminfo(&i);
 	si_swapinfo(&i);
-	committed = atomic_read(&vm_committed_space);
+	committed = vm_atomic_read(&vm_committed_space);
 	allowed = ((totalram_pages - hugetlb_total_pages())
 		* sysctl_overcommit_ratio / 100) + total_swap_pages;
 


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