linux-kernel - Re: [RFC v2 1/4] mm: make alloc_pages_exact_node pass __GFP

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Date:	Fri, 24 Jul 2015 16:09:05 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Greg Thelen <gthelen@...gle.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: Re: [RFC v2 1/4] mm: make alloc_pages_exact_node pass
 __GFP_THISNODE

On Fri, 24 Jul 2015, Vlastimil Babka wrote:

> > I assume you looked at the collapse_huge_page() case and decided that it 
> > needs no modification since the gfp mask is used later for other calls?
> 
> Yeah. Not that the memcg charge parts would seem to care about __GFP_THISNODE,
> though.
> 

Hmm, not sure that memcg would ever care about __GFP_THISNODE.  I wonder 
if it make more sense to remove setting __GFP_THISNODE in 
collapse_huge_page()?  khugepaged_alloc_page() seems fine with the new 
alloc_pages_exact_node() semantics.

> >> diff --git a/mm/migrate.c b/mm/migrate.c
> >> index f53838f..d139222 100644
> >> --- a/mm/migrate.c
> >> +++ b/mm/migrate.c
> >> @@ -1554,10 +1554,8 @@ static struct page *alloc_misplaced_dst_page(struct page *page,
> >>  	struct page *newpage;
> >>  
> >>  	newpage = alloc_pages_exact_node(nid,
> >> -					 (GFP_HIGHUSER_MOVABLE |
> >> -					  __GFP_THISNODE | __GFP_NOMEMALLOC |
> >> -					  __GFP_NORETRY | __GFP_NOWARN) &
> >> -					 ~GFP_IOFS, 0);
> >> +				(GFP_HIGHUSER_MOVABLE | __GFP_NOMEMALLOC |
> >> +				 __GFP_NORETRY | __GFP_NOWARN) & ~GFP_IOFS, 0);
> >>  
> >>  	return newpage;
> >>  }
> > [snip]
> > 
> > What about the alloc_pages_exact_node() in new_page_node()?
> 
> Oops, seems I missed that one. So the API seems ok otherwise?
> 

Yup!  And I believe that this patch doesn't cause any regression after the 
new_page_node() issue is fixed.
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