linux-kernel - Re: [patch 1/1] MM: detach_vmas_to_be

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Date:	Tue, 27 Feb 2007 12:27:27 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	akuster <akuster@...sta.com>
Cc:	ioe-lkml@...eria.de, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/1] MM:  detach_vmas_to_be_unmapped fix

> On Fri, 23 Feb 2007 08:27:00 -0800 akuster <akuster@...sta.com> wrote:
> Wolfgang Wander submitted a fix to address a mmap fragmentation issue. 
> The git patch ( 1363c3cd8603a913a27e2995dccbd70d5312d8e6 ) is somewhat 
> different and yields different results when running Wolfgang's test case 
> leakme.c.
> 
> IMHO, the vm start and end address are swapped in arch_unmap_area and 
> arch_unmap_area_topdown functions.
> 
> Prior to this patch arch_unmap_area() used area->vm_start and 
> arch_unmap_area_topdown used area->vm_end in the git patch the following 
> change showed up.
> 
> if (mm->unmap_area == arch_unmap_area)
>      addr = prev ? prev->vm_start : mm->mmap_base;
> else
>      addr = vma ?  vma->vm_end : mm->mmap_base;
> 
> Using Wolfgang Wander's leakme.c test, I get the same results seen with 
> his original "Avoiding mmap fragmentation" patch as I do after swapping 
>   the start & end address in the above code segment. The patch I 
> submitted  addresses this typo issue.

That's still not an adequate or terribly useful changlog, sorry.

Please tell us exactly what this patch does, without referring to some other
patch which I cannot remember nor presently access.

I particular, before-and-after testing results would be useful so we can
see what the effect of this change is.

Also, please send a Signed-of-by: for this work, thanks.
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