On Monday, October 17, 2011, Stanislaw Gruszka wrote:
> When debugging memory corruption with CONFIG_DEBUG_PAGEALLOC and
> corrupt_dbg > 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
> corrupt_dbg=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>
> ---
> include/linux/mm.h | 7 ++++++-
> kernel/power/snapshot.c | 6 ++++++
> mm/page_alloc.c | 6 ------
> 3 files changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 17e3658..651785b 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1630,13 +1630,18 @@ extern void copy_user_huge_page(struct page *dst, struct page *src,
> #ifdef CONFIG_DEBUG_PAGEALLOC
> extern unsigned int _corrupt_dbg;
>
> -
> static inline unsigned int corrupt_dbg(void)
> {
> return _corrupt_dbg;
> }
> +
> +static inline bool page_is_corrupt_dbg(struct page *page)
> +{
> + return test_bit(PAGE_DEBUG_FLAG_CORRUPT, &page->debug_flags);
> +}
> #else
> static inline unsigned int corrupt_dbg(void) { return 0; }
> +static inline bool page_is_corrupt_dbg(struct page *page) { return false; }
> #endif /* CONFIG_DEBUG_PAGEALLOC */
>
> #endif /* __KERNEL__ */
> diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
> index 06efa54..45cf1b1 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_corrupt_dbg(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_corrupt_dbg(page))
> + return NULL;
> +
> return page;
> }
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 8d18ae4..8a7770a 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -425,15 +425,9 @@ static inline void clear_page_corrupt_dbg(struct page *page)
> __clear_bit(PAGE_DEBUG_FLAG_CORRUPT, &page->debug_flags);
> }
>
> -static inline bool page_is_corrupt_dbg(struct page *page)
> -{
> - return test_bit(PAGE_DEBUG_FLAG_CORRUPT, &page->debug_flags);
> -}
> -
> #else
> static inline void set_page_corrupt_dbg(struct page *page) { }
> static inline void clear_page_corrupt_dbg(struct page *page) { }
> -static inline bool page_is_corrupt_dbg(struct page *page) { return false; }
> #endif
>
> static inline void set_page_order(struct page *page, int order)
>
--
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