linux-kernel - [PATCH 3/7] remove putback_lru_pages() in hugepage migration context

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Date:	Fri, 21 Jan 2011 15:28:56 +0900
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Andi Kleen <tatsu@...jp.nec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Huang Ying <ying.huang@...el.com>,
	Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>,
	tony.luck@...el.com, LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Minchan Kim <minchan.kim@...il.com>
Subject: [PATCH 3/7] remove putback_lru_pages() in hugepage migration context

This putback_lru_pages() is inserted at cf608ac19c to allow
memory compaction to count the number of migration failed pages.

But we should not do it for a hugepage because page->lru of a hugepage
is used differently from that of a normal page:

   in-use hugepage : page->lru is unlinked,
   free hugepage   : page->lru is linked to the free hugepage list,

so putting back hugepages to LRU lists collapses this rule.
We just drop this change (without any impact on memory compaction.)

Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Minchan Kim <minchan.kim@...il.com>
---
 mm/memory-failure.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git v2.6.38-rc1/mm/memory-failure.c v2.6.38-rc1/mm/memory-failure.c
index 548fbd7..b4910e8 100644
--- v2.6.38-rc1/mm/memory-failure.c
+++ v2.6.38-rc1/mm/memory-failure.c
@@ -1295,7 +1295,6 @@ static int soft_offline_huge_page(struct page *page, int flags)
 	ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0,
 				true);
 	if (ret) {
-		putback_lru_pages(&pagelist);
 		pr_debug("soft offline: %#lx: migration failed %d, type %lx\n",
 			 pfn, ret, page->flags);
 		if (ret > 0)
-- 
1.7.3.4

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