linux-kernel - Re: [PATCH 3/8] mm: remove MPOL_MF

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Date:	Mon, 9 May 2011 15:39:16 -0400
From:	Stephen Wilson <wilsons@...rt.ca>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Stephen Wilson <wilsons@...rt.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/8] mm: remove MPOL_MF_STATS

On Mon, May 09, 2011 at 04:44:24PM +0900, KOSAKI Motohiro wrote:
> > Mapping statistics in a NUMA environment is now computed using the
> > generic walk_page_range() logic.  Remove the old/equivalent
> > functionality.
> > 
> > Signed-off-by: Stephen Wilson <wilsons@...rt.ca>
> > ---
> >  mm/mempolicy.c |   10 ++++++----
> >  1 files changed, 6 insertions(+), 4 deletions(-)
> > 
> > diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> > index dfe27e3..63c0d69 100644
> > --- a/mm/mempolicy.c
> > +++ b/mm/mempolicy.c
> > @@ -99,7 +99,6 @@
> >  /* Internal flags */
> >  #define MPOL_MF_DISCONTIG_OK (MPOL_MF_INTERNAL << 0)	/* Skip checks for continuous vmas */
> >  #define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1)		/* Invert check for nodemask */
> > -#define MPOL_MF_STATS (MPOL_MF_INTERNAL << 2)		/* Gather statistics */
> >  
> >  static struct kmem_cache *policy_cache;
> >  static struct kmem_cache *sn_cache;
> > @@ -492,9 +491,7 @@ static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
> >  		if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
> >  			continue;
> >  
> > -		if (flags & MPOL_MF_STATS)
> > -			gather_stats(page, private, pte_dirty(*pte));
> > -		else if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
> > +		if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
> >  			migrate_page_add(page, private, flags);
> >  		else
> >  			break;
> 
> This hunk looks good to me.
> 
> 
> > @@ -2572,6 +2569,7 @@ static int gather_pte_stats(pte_t *pte, unsigned long addr,
> >  		unsigned long pte_size, struct mm_walk *walk)
> >  {
> >  	struct page *page;
> > +	int nid;
> >  
> >  	if (pte_none(*pte))
> >  		return 0;
> > @@ -2580,6 +2578,10 @@ static int gather_pte_stats(pte_t *pte, unsigned long addr,
> >  	if (!page)
> >  		return 0;
> >  
> > +	nid = page_to_nid(page);
> > +	if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
> > +		return 0;
> > +
> >  	gather_stats(page, walk->private, pte_dirty(*pte));
> >  	return 0;
> 
> However this hunk should be moved into patch [2/8]. because 1) keeping
> bisectability 2) The description says "Remove the old/equivalent
> functionality." but it added new functionality.

Absolutely.  Will move into the proper location and resend the whole
series.

Thanks again,

-- 
steve

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