[PATCH] Direct Migration V9: Avoid writeback / page_migrate() method

Migrate a page with buffers without requiring writeback

This introduces a new address space operation migratepage() that may be used
by a filesystem to implement its own version of page migration.

A version is provided that migrates buffers attached to pages.  Some
filesystems (ext2, ext3, xfs) are modified to utilize this feature.

The swapper address space operation are modified so that a regular
migrate_page() will occur for anonymous pages without writeback (migrate_pages
forces every anonymous page to have a swap entry).

Signed-off-by: Mike Kravetz <kravetz@us.ibm.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index f4b91d7aa5cf..df2c41c2a9a2 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -233,6 +233,7 @@ void remove_from_swap(struct page *page)
 
         delete_from_swap_cache(page);
 }
+EXPORT_SYMBOL(remove_from_swap);
 #endif
 
 /*