linux-kernel - [PATCH 4/4] mm: remove direct calling of migration

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Date:	Mon, 13 Jul 2015 17:35:19 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	jlayton@...chiereds.net, bfields@...ldses.org, vbabka@...e.cz,
	iamjoonsoo.kim@....com, viro@...iv.linux.org.uk, mst@...hat.com,
	koct9i@...il.com, minchan@...nel.org, aquini@...hat.com,
	linux-fsdevel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	linux-mm@...ck.org
Cc:	dri-devel@...ts.freedesktop.org, akpm@...ux-foundation.org,
	Gioh Kim <gurugio@...mail.net>, Gioh Kim <gioh.kim@....com>
Subject: [PATCH 4/4] mm: remove direct calling of migration

From: Gioh Kim <gurugio@...mail.net>

Migration is completely generalized so that migrating mobile page
is processed with lru-pages in move_to_new_page.

Signed-off-by: Gioh Kim <gioh.kim@....com>
Acked-by: Rafael Aquini <aquini@...hat.com>
---
 mm/migrate.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 53f0081d..e6644ac 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -844,21 +844,6 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
 		}
 	}
 
-	if (unlikely(mobile_page(page))) {
-		/*
-		 * A mobile page does not need any special attention from
-		 * physical to virtual reverse mapping procedures.
-		 * Skip any attempt to unmap PTEs or to remap swap cache,
-		 * in order to avoid burning cycles at rmap level, and perform
-		 * the page migration right away (proteced by page lock).
-		 */
-		lock_page(newpage);
-		rc = page->mapping->a_ops->migratepage(page->mapping,
-						       newpage, page, mode);
-		unlock_page(newpage);
-		goto out_unlock;
-	}
-
 	/*
 	 * Corner case handling:
 	 * 1. When a new swap-cache page is read into, it is added to the LRU
-- 
2.1.4

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