linux-kernel - [Question] detach_vmas_to_be

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Message-ID: <45D62472.9030202@mvista.com>
Date:	Fri, 16 Feb 2007 11:38:58 -1000
From:	akuster <akuster@...sta.com>
To:	lkml <linux-kernel@...r.kernel.org>
Subject: [Question]  detach_vmas_to_be_unmapped

Hello,

I am a bit confused on why the vm start and end address where swapped in 
arch_unmap_area and arch_unmap_area_topdown functions after the official 
Avoiding mmap fragmentation ( 1363c3cd8603a913a27e2995dccbd70d5312d8e6 ) 
patch.

Prior to this patch arch_unmap_area() used area->vm_start and 
arch_unmap_area_topdown used area->vm_end after the 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.

Is it just a typo in the official patch or am I missing the much bigger 
picture?

Note: I have only run this on an Pentium4 with 1GiG memory.

TIA

Armin

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