linux-kernel - [PATCH] mm, migrate: count pages failing all retries in vmstat and tracepoint

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Date:	Thu, 27 Aug 2015 16:20:27 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH] mm, migrate: count pages failing all retries in vmstat and tracepoint

Migration tries up to 10 times to migrate pages that return -EAGAIN until it
gives up. If some pages fail all retries, they are counted towards the number
of failed pages that migrate_pages() returns. They should also be counted in
the /proc/vmstat pgmigrate_fail and in the mm_migrate_pages tracepoint.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/migrate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index eb42671..e705324 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1152,7 +1152,8 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
 			}
 		}
 	}
-	rc = nr_failed + retry;
+	nr_failed += retry;
+	rc = nr_failed;
 out:
 	if (nr_succeeded)
 		count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
-- 
2.5.0

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