Messages in this thread Patch in this message | | | From | Stanislaw Gruszka <> | Subject | [PATCH v2 2/3] PM / Hibernate : do not count debug pages as savable | Date | Fri, 18 Nov 2011 17:25:06 +0100 |
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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.
v1 -> v2: - change "corrupt" name to guard page
Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> --- kernel/power/snapshot.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index cbe2c14..1cf8890 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; } -- 1.7.1
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