The patch titled
Subject: mm, migrate: count pages failing all retries in vmstat and tracepoint
has been added to the -mm tree. Its filename is
mm-migrate-count-pages-failing-all-retries-in-vmstat-and-tracepoint.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-migrate-count-pages-failing-all-retries-in-vmstat-and-tracepoint.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-migrate-count-pages-failing-all-retries-in-vmstat-and-tracepoint.patch
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------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: 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@xxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/migrate.c~mm-migrate-count-pages-failing-all-retries-in-vmstat-and-tracepoint mm/migrate.c
--- a/mm/migrate.c~mm-migrate-count-pages-failing-all-retries-in-vmstat-and-tracepoint
+++ a/mm/migrate.c
@@ -1159,7 +1159,8 @@ int migrate_pages(struct list_head *from
}
}
}
- rc = nr_failed + retry;
+ nr_failed += retry;
+ rc = nr_failed;
out:
if (nr_succeeded)
count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-migrate-count-pages-failing-all-retries-in-vmstat-and-tracepoint.patch
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