linux-kernel - Re: [patch] hugetlb: correct page offset index for sharing pmd

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Message-ID: <20120810125102.GB1425@dhcp22.suse.cz>
Date:	Fri, 10 Aug 2012 14:51:02 +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>
Subject: Re: [patch] hugetlb: correct page offset index for sharing pmd

On Fri 10-08-12 20:37:20, Hillf Danton wrote:
> On Fri, Aug 10, 2012 at 8:27 PM, Michal Hocko <mhocko@...e.cz> wrote:
> >
> > I guess you mean unmap_ref_private and that has been changed by you
> > (0c176d5 mm: hugetlb: fix pgoff computation when unmapping page from
> > vma)...  I was wrong at that time when giving my Reviewed-by. The patch
> > didn't break anything because you still find all relevant vmas because
> > vma_hugecache_offset just provides a smaller index which is still within
> > boundaries.
> 
> No, as shown by the log message of 0c176d52b,  that fix was
> triggered by  (vma->vm_pgoff >> PAGE_SHIFT), thus I dont see
> what you really want to revert.

fix for that would be a part of the revert of course.
 
> > I think that 0c176d52 should be reverted because we do not have to refer
> > to the head page in this case and as we can see it causes confusion.

-- 
Michal Hocko
SUSE Labs
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