linux-kernel - Re: [PATCH 0/2] Fix migration races in rmap

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Message-ID: <20100503234132.GK5336@cmpxchg.org>
Date:	Tue, 4 May 2010 01:41:32 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 0/2] Fix migration races in rmap_walk() V3

On Mon, May 03, 2010 at 05:33:01PM +0200, Andrea Arcangeli wrote:
> On Sat, May 01, 2010 at 03:51:10PM +0200, Johannes Weiner wrote:
> > On Fri, Apr 30, 2010 at 08:28:53PM +0200, Andrea Arcangeli wrote:
> > > Subject: adapt mprotect to anon_vma chain semantics
> > > 
> > > From: Andrea Arcangeli <aarcange@...hat.com>
> > > 
> > > wait_split_huge_page interface changed.
> > > 
> > > Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> > > ---
> > > 
> > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > > --- a/mm/huge_memory.c
> > > +++ b/mm/huge_memory.c
> > > @@ -929,7 +929,7 @@ int change_huge_pmd(struct vm_area_struc
> > >  	if (likely(pmd_trans_huge(*pmd))) {
> > >  		if (unlikely(pmd_trans_splitting(*pmd))) {
> > >  			spin_unlock(&mm->page_table_lock);
> > > -			wait_split_huge_page(vma->anon_vma, pmd);
> > > +			wait_split_huge_page(mm, pmd);
> > 
> > That makes mprotect-vma-arg obsolete, I guess.
> 
> Well it's needed for flush_tlb_range.

I must have been blind, sorry for the noise.

> In mincore_huge_pmd probably we could pass vma->vm_mm instead of
> vma (as there is not flush_tlb_range), I can change it if you prefer.

Although not strictly required, it's probably nicer to keep the
function signatures in this code alike.  So everything fine with
me as it stands :)

	Hannes
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