linux-kernel - [PATCH v2 1/7] mm/migrate: add comment about permanent failure path

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Date:	Mon,  9 Dec 2013 18:10:42 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Rafael Aquini <aquini@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <js1304@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Vlastimil Babka <vbabka@...e.cz>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v2 1/7] mm/migrate: add comment about permanent failure path

From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

Let's add a comment about where the failed page goes to, which makes
code more readable.

Acked-by: Christoph Lameter <cl@...ux.com>
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

diff --git a/mm/migrate.c b/mm/migrate.c
index 3747fcd..c6ac87a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1123,7 +1123,12 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
 				nr_succeeded++;
 				break;
 			default:
-				/* Permanent failure */
+				/*
+				 * Permanent failure (-EBUSY, -ENOSYS, etc.):
+				 * unlike -EAGAIN case, the failed page is
+				 * removed from migration page list and not
+				 * retried in the next outer loop.
+				 */
 				nr_failed++;
 				break;
 			}
-- 
1.7.9.5

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