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authorStanislaw Gruszka <sgruszka@redhat.com>2012-01-10 15:07:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:42 -0800
commitc6968e73b90c2a2fb9a32d4bad249f8f70f70125 (patch)
tree67ec90fc8e187fcf316298dd9d514bbbbbc8f187 /kernel
parentc0a32fc5a2e470d0b02597b23ad79a317735253e (diff)
downloadlinux-c6968e73b90c2a2fb9a32d4bad249f8f70f70125.tar.bz2
PM/Hibernate: do not count debug pages as savable
When debugging with CONFIG_DEBUG_PAGEALLOC and debug_guardpage_minorder > 0, we have lot of free pages that are not marked so. Snapshot code account them as savable, what cause hibernate memory preallocation failure. It is pretty hard to make hibernate allocation succeed with debug_guardpage_minorder=1. This change at least make it possible when system has relatively big amount of RAM. Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/snapshot.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index cbe2c1441392..1cf88900ec4f 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -858,6 +858,9 @@ static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn)
PageReserved(page))
return NULL;
+ if (page_is_guard(page))
+ return NULL;
+
return page;
}
@@ -920,6 +923,9 @@ static struct page *saveable_page(struct zone *zone, unsigned long pfn)
&& (!kernel_page_present(page) || pfn_is_nosave(pfn)))
return NULL;
+ if (page_is_guard(page))
+ return NULL;
+
return page;
}