linux-kernel - Re: [PATCH 1/1] pagemap clear_refs: modify to specify anon or mapped vma clearing

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Message-ID: <alpine.DEB.2.00.0907271657160.27881@chino.kir.corp.google.com>
Date:	Mon, 27 Jul 2009 16:58:20 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Moussa Ba <moussa.a.ba@...il.com>
cc:	linux-kernel@...r.kernel.org, xiyou.wangcong@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Matt Mackall <mpm@...enic.com>, Mel Gorman <mel@....ul.ie>,
	Ying Han <yinghan@...gle.com>, Nick Piggin <npiggin@...e.de>,
	jaredeh@...il.com
Subject: Re: [PATCH 1/1] pagemap clear_refs: modify to specify anon or mapped
 vma clearing

On Mon, 27 Jul 2009, Moussa Ba wrote:

> The other alternative would be to just forgo the additional function
> clear_refs_walk_vma and rewrite the for loop as:
> 
>         for (vma = mm->mmap; vma; vma = vma->vm_next) {
> 			clear_refs_walk.private = vma;
> 			if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED)
> 				continue;
> 			if (is_vm_hugetlb_page(vma))
> 				continue;
> 			if (type == CLEAR_REFS_ANON && vma->vm_file)
> 				continue;
> 			if (type == CLEAR_REFS_MAPPED && !vma->vm_file)
> 				continue;
> 			walk_page_range(vma->vm_start, vma->vm_end, this_walk);
>         }
> 

That looks good, with the exception of the check for
type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED being in the loop.
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