linux-kernel - Re: Re : vm: weird behaviour when munmapping

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Date:	Fri, 17 Nov 2006 15:21:08 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	moreau francis <francis_moreau2000@...oo.fr>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Re : vm: weird behaviour when munmapping

On Fri, 2006-11-17 at 14:12 +0000, moreau francis wrote:
> Peter Zijlstra wrote:
> > No indeed. You seem confused with remaining and new. 
> > 
> > It has one VMA (A) it needs to split that into two pieces, it happens to
> > do it like (B,A') where A' is the old VMA object with new a start
> > address, and B is a new VMA object.
> 
> Is there any rules to decide which VMA is the new one ? 

The new object is the one allocated using:
	new = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);

> From what you wrote it seems that we call B the new object because
> it has a new end address...

No, because its newly allocated.

> From my point of view, I called B the old VMA simply because it's
> going to be destroyed...

Please read Mel Gorman's book on memory management to gain a better
understanding.

http://www.phptr.com/bookstore/product.asp?isbn=0131453483&rl=1


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