mm: Fix infinite loop when offlining
When page migration is unable to find free memory it
will go into an infinite loop because the
all_unreclaimable flag is never set.
This change will allow memory offlining to fail
gracefully if there is not enough memory for page
migration.
__GFP_NORETRY tells the page_alloc to not retry.
__GFP_NOWARN suppresses page fault warnings when
page allocation fails.
__GFP_NOMEMALLOC prevents it from aggressively
allocating beyond zone watermarks.
Change-Id: I94dfd9059851c7b24953f44a4018a3bbac840688
Signed-off-by: Jack Cheung <jackc@codeaurora.org>
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 8487c49..709dc6d 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -753,7 +753,8 @@
hotremove_migrate_alloc(struct page *page, unsigned long private, int **x)
{
/* This should be improooooved!! */
- return alloc_page(GFP_HIGHUSER_MOVABLE);
+ return alloc_page(GFP_HIGHUSER_MOVABLE | __GFP_NORETRY | __GFP_NOWARN |
+ __GFP_NOMEMALLOC);
}
#define NR_OFFLINE_AT_ONCE_PAGES (256)