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PM/Hibernate: do not count debug pages as savable

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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>
This commit is contained in:
Stanislaw Gruszka 2012-01-10 15:07:31 -08:00 committed by Linus Torvalds
parent c0a32fc5a2
commit c6968e73b9
1 changed files with 6 additions and 0 deletions
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6
kernel/power/snapshot.c
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@ -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;
}