The patch titled
Subject: PM/Hibernate: do not count debug pages as savable
has been added to the -mm tree. Its filename is
pm-hibernate-do-not-count-debug-pages-as-savable.patch
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------------------------------------------------------
From: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Acked-by: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/power/snapshot.c | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN kernel/power/snapshot.c~pm-hibernate-do-not-count-debug-pages-as-savable kernel/power/snapshot.c
--- a/kernel/power/snapshot.c~pm-hibernate-do-not-count-debug-pages-as-savable
+++ a/kernel/power/snapshot.c
@@ -858,6 +858,9 @@ static struct page *saveable_highmem_pag
PageReserved(page))
return NULL;
+ if (page_is_guard(page))
+ return NULL;
+
return page;
}
@@ -920,6 +923,9 @@ static struct page *saveable_page(struct
&& (!kernel_page_present(page) || pfn_is_nosave(pfn)))
return NULL;
+ if (page_is_guard(page))
+ return NULL;
+
return page;
}
_
Subject: Subject: PM/Hibernate: do not count debug pages as savable
Patches currently in -mm which might be from sgruszka@xxxxxxxxxx are
linux-next.patch
mm-more-intensive-memory-corruption-debug.patch
mm-more-intensive-memory-corruption-debug-fix.patch
pm-hibernate-do-not-count-debug-pages-as-savable.patch
slub-min-order-when-debug_guardpage_minorder-0.patch
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