The patch titled
page migration: Update comments
has been added to the -mm tree. Its filename is
more-page-migration-use-migration-entries-for-file-pages-update-comments-8.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
From: Christoph Lameter <clameter@xxxxxxx>
Edit comments to be nicer better and reflect the current state of page
migration.
Remove useless BUG_ON() in migrate_entry_wait() since
migration_entry_to_page() already does a BUG_ON().
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
vm/page_migration | 0
mm/migrate.c | 17 +++++++++--------
linux/swap.h | 0
3 files changed, 9 insertions(+), 8 deletions(-)
diff -puN Documentation/vm/page_migration~more-page-migration-use-migration-entries-for-file-pages-update-comments-8 Documentation/vm/page_migration
diff -puN include/linux/swap.h~more-page-migration-use-migration-entries-for-file-pages-update-comments-8 include/linux/swap.h
diff -puN mm/migrate.c~more-page-migration-use-migration-entries-for-file-pages-update-comments-8 mm/migrate.c
--- devel/mm/migrate.c~more-page-migration-use-migration-entries-for-file-pages-update-comments-8 2006-05-11 00:00:19.000000000 -0700
+++ devel-akpm/mm/migrate.c 2006-05-11 00:00:19.000000000 -0700
@@ -461,19 +461,20 @@ int buffer_migrate_page(struct address_s
}
EXPORT_SYMBOL(buffer_migrate_page);
+/*
+ * Default handling if a filesystem does not provide a migration function.
+ */
static int fallback_migrate_page(struct address_space *mapping,
struct page *newpage, struct page *page)
{
- /*
- * Default handling if a filesystem does not provide
- * a migration function. We can only migrate clean
- * pages so try to write out any dirty pages first.
- */
if (PageDirty(page)) {
/*
- * Remove the migration entries because pageout() may
- * unlock which may result in migration entries pointing
- * to unlocked pages.
+ * A dirty page may imply that the underlying filesystem has
+ * the page on some queue. So the page must be clean for
+ * migration. Writeout may mean we loose the lock and the
+ * page state is no longer what we checked for earlier.
+ * At this point we know that the migration attempt cannot
+ * be successful.
*/
remove_migration_ptes(page, page);
_
Patches currently in -mm which might be from clameter@xxxxxxx are
origin.patch
page-migration-make-do_swap_page-redo-the-fault.patch
slab-extract-cache_free_alien-from-__cache_free.patch
migration-remove-unnecessary-pageswapcache-checks.patch
page-migration-cleanup-rename-ignrefs-to-migration.patch
page-migration-cleanup-group-functions.patch
page-migration-cleanup-remove-useless-definitions.patch
page-migration-cleanup-drop-nr_refs-in-remove_references.patch
page-migration-cleanup-extract-try_to_unmap-from-migration-functions.patch
page-migration-cleanup-extract-try_to_unmap-from-migration-functions-update-comments-7.patch
page-migration-cleanup-pass-mapping-to-migration-functions.patch
page-migration-cleanup-move-fallback-handling-into-special-function.patch
swapless-pm-add-r-w-migration-entries.patch
swapless-pm-add-r-w-migration-entries-ifdefs.patch
swapless-pm-add-r-w-migration-entries-update-comments.patch
swapless-pm-add-r-w-migration-entries-update-comments-4.patch
swapless-pm-add-r-w-migration-entries-update-comments-6.patch
swapless-page-migration-rip-out-swap-based-logic.patch
swapless-page-migration-modify-core-logic.patch
more-page-migration-do-not-inc-dec-rss-counters.patch
more-page-migration-use-migration-entries-for-file-pages.patch
more-page-migration-use-migration-entries-for-file-pages-fix.patch
more-page-migration-use-migration-entries-for-file-pages-update-comments-5.patch
more-page-migration-use-migration-entries-for-file-pages-update-comments-8.patch
page-migration-update-documentation.patch
page-migration-update-comments-9.patch
page-migration-remove-useless-mapping-checks.patch
page-migration-fix-up-remove_migration_ptes.patch
page-migration-replace-call-to-pageout-with-writepage.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
