linux-kernel - Re: [PATCH 1/3] mm/page_alloc: don't break highest order freepage if steal

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Date:	Tue, 19 May 2015 16:44:30 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 1/3] mm/page_alloc: don't break highest order freepage if
 steal

On Tue, May 12, 2015 at 09:54:51AM +0200, Vlastimil Babka wrote:
> On 05/12/2015 09:51 AM, Vlastimil Babka wrote:
> >>   {
> >>   	struct page *page;
> >>+	bool steal_fallback;
> >>
> >>-retry_reserve:
> >>+retry:
> >>   	page = __rmqueue_smallest(zone, order, migratetype);
> >>
> >>   	if (unlikely(!page) && migratetype != MIGRATE_RESERVE) {
> >>   		if (migratetype == MIGRATE_MOVABLE)
> >>   			page = __rmqueue_cma_fallback(zone, order);
> >>
> >>-		if (!page)
> >>-			page = __rmqueue_fallback(zone, order, migratetype);
> >>+		if (page)
> >>+			goto out;
> >>+
> >>+		steal_fallback = __rmqueue_fallback(zone, order, migratetype);
> 
> Oh and the variable can be probably replaced by calling
> __rmqueue_fallback directly in the if() below.

Will do.

Thanks.

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