On Wed, 2012-12-05 at 16:47 -0500, Naoya Horiguchi wrote:
> Memory error handling on hugepages can break a RSS counter, which emits
> a message like "Bad rss-counter state mm:ffff88040abecac0 idx:1 val:-1".
> This is because PageAnon returns true for hugepage (this behavior is
Could you explain why PageAnon returns true for hugepage?
> necessary for reverse mapping to work on hugetlbfs).
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> ---
> mm/rmap.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git v3.7-rc8.orig/mm/rmap.c v3.7-rc8/mm/rmap.c
> index 2ee1ef0..df54ef0 100644
> --- v3.7-rc8.orig/mm/rmap.c
> +++ v3.7-rc8/mm/rmap.c
> @@ -1235,7 +1235,9 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
> update_hiwater_rss(mm);
>
> if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) {
> - if (PageAnon(page))
> + if (PageHuge(page))
> + ;
> + else if (PageAnon(page))
> dec_mm_counter(mm, MM_ANONPAGES);
> else
> dec_mm_counter(mm, MM_FILEPAGES);
--
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