linux-kernel - Re: [PATCH] hugetlb: do not use vma_hugecache_offset for vma_prio_tree

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Message-ID: <20120813134900.GE24248@dhcp22.suse.cz>
Date:	Mon, 13 Aug 2012 15:49:00 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH] hugetlb: do not use vma_hugecache_offset for
 vma_prio_tree_foreach

On Mon 13-08-12 21:24:36, Hillf Danton wrote:
> On Mon, Aug 13, 2012 at 9:09 PM, Michal Hocko <mhocko@...e.cz> wrote:
> > On Mon 13-08-12 20:10:41, Hillf Danton wrote:
> >> On Sun, Aug 12, 2012 at 5:31 PM, Michal Hocko <mhocko@...e.cz> wrote:
> >> > From d07b88a70ee1dbcc96502c48cde878931e7deb38 Mon Sep 17 00:00:00 2001
> >> > From: Michal Hocko <mhocko@...e.cz>
> >> > Date: Fri, 10 Aug 2012 15:03:07 +0200
> >> > Subject: [PATCH] hugetlb: do not use vma_hugecache_offset for
> >> >  vma_prio_tree_foreach
> >> >
> >> > 0c176d5 (mm: hugetlb: fix pgoff computation when unmapping page
> >> > from vma) fixed pgoff calculation but it has replaced it by
> >> > vma_hugecache_offset which is not approapriate for offsets used for
> >> > vma_prio_tree_foreach because that one expects index in page units
> >> > rather than in huge_page_shift.
> >>
> >>
> >> What if another case of vma_prio_tree_foreach in try_to_unmap_file
> >> is correct?
> >
> > That one is surely correct (linear_page_index converts the page offset).
> 
> But linear_page_index is not used in this patch, why?

I will leave it as an excersise for the careful reader...
-- 
Michal Hocko
SUSE Labs
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