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authorSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>2013-04-29 15:08:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-29 15:54:37 -0700
commitc73e5c9c59a0f7ba30b3e5f7bd2d8097d4c89c6d (patch)
tree00358e655740230b103854f581d00c58a691a866 /mm
parent52f37629fd3c7b24e1e6c125e665454cd7ac1acb (diff)
downloadlinux-c73e5c9c59a0f7ba30b3e5f7bd2d8097d4c89c6d.tar.gz
mm: rewrite the comment over migrate_pages() more comprehensibly
The comment over migrate_pages() looks quite weird, and makes it hard to grasp what it is trying to say. Rewrite it more comprehensibly. Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Hugh Dickins <hughd@google.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.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index c87ef920785..27ed22579fd 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -973,19 +973,23 @@ out:
}
/*
- * migrate_pages
+ * migrate_pages - migrate the pages specified in a list, to the free pages
+ * supplied as the target for the page migration
*
- * The function takes one list of pages to migrate and a function
- * that determines from the page to be migrated and the private data
- * the target of the move and allocates the page.
+ * @from: The list of pages to be migrated.
+ * @get_new_page: The function used to allocate free pages to be used
+ * as the target of the page migration.
+ * @private: Private data to be passed on to get_new_page()
+ * @mode: The migration mode that specifies the constraints for
+ * page migration, if any.
+ * @reason: The reason for page migration.
*
- * The function returns after 10 attempts or if no pages
- * are movable anymore because to has become empty
- * or no retryable pages exist anymore.
- * Caller should call putback_lru_pages to return pages to the LRU
+ * The function returns after 10 attempts or if no pages are movable any more
+ * because the list has become empty or no retryable pages exist any more.
+ * The caller should call putback_lru_pages() to return pages to the LRU
* or free list only if ret != 0.
*
- * Return: Number of pages not migrated or error code.
+ * Returns the number of pages that were not migrated, or an error code.
*/
int migrate_pages(struct list_head *from, new_page_t get_new_page,
unsigned long private, enum migrate_mode mode, int reason)