linux-kernel - [PATCH 2/2] mm: __free_pages batch up 0-order pages for freeing

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Message-Id: <1427839895-16434-2-git-send-email-sasha.levin@oracle.com>
Date:	Tue, 31 Mar 2015 18:11:33 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	mhocko@...e.cz, Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	linux-mm@...ck.org (open list:MEMORY MANAGEMENT)
Subject: [PATCH 2/2] mm: __free_pages batch up 0-order pages for freeing

Rather than calling free_hot_cold_page() for every page, batch them up in a
list and pass them on to free_hot_cold_page_list(). This will let us defer
them to a workqueue.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 mm/page_alloc.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 812ca75..e58e795 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2997,12 +2997,16 @@ EXPORT_SYMBOL(get_zeroed_page);
 
 void __free_pages(struct page *page, unsigned int order)
 {
+	LIST_HEAD(hot_cold_pages);
+
 	if (put_page_testzero(page)) {
 		if (order == 0)
-			free_hot_cold_page(page, false);
+			list_add(&page->lru, &hot_cold_pages);
 		else
 			__free_pages_ok(page, order);
 	}
+
+	free_hot_cold_page_list(&hot_cold_pages, false);
 }
 
 EXPORT_SYMBOL(__free_pages);
-- 
1.7.10.4

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