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| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2014-01-21 15:51:14 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-21 16:19:49 -0800 |
| commit | 354a3363363724c21ea2e4b28370e27983c2452e (patch) | |
| tree | 3101d66bb89d294114e75cd1047c931f1f364847 /mm | |
| parent | aed0a0e32de387da831284fda25021de32477195 (diff) | |
| download | linux-354a3363363724c21ea2e4b28370e27983c2452e.tar.gz linux-354a3363363724c21ea2e4b28370e27983c2452e.tar.bz2 linux-354a3363363724c21ea2e4b28370e27983c2452e.zip | |
mm/migrate: add comment about permanent failure path
Let's add a comment about where the failed page goes to, which makes
code more readable.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Christoph Lameter <cl@linux.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Acked-by: Rafael Aquini <aquini@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/migrate.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index f9e16350d09c..626ca3c5d07b 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1125,7 +1125,12 @@ 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; } |