On Thu, 31 Jan 2013 10:25:58 -0500
Naoya Horiguchi <[email protected]> wrote:
> num_poisoned_pages counts up the number of pages isolated by memory errors.
> But for thp, only one subpage is isolated because memory error handler
> splits it, so it's wrong to add (1 << compound_trans_order).
>
> ...
>
> --- mmotm-2013-01-23-17-04.orig/mm/memory-failure.c
> +++ mmotm-2013-01-23-17-04/mm/memory-failure.c
> @@ -1039,7 +1039,14 @@ int memory_failure(unsigned long pfn, int trapno, int
> flags)
> return 0;
> }
>
> - nr_pages = 1 << compound_trans_order(hpage);
> + /*
> + * If a thp is hit by a memory failure, it's supposed to be split.
> + * So we should add only one to num_poisoned_pages for that case.
> + */
> + if (PageHuge(p))
/*
* PageHuge() only returns true for hugetlbfs pages, but not for normal or
* transparent huge pages. See the PageTransHuge() documentation for more
* details.
*/
int PageHuge(struct page *page)
{
> + nr_pages = 1 << compound_trans_order(hpage);
> + else /* normal page or thp */
> + nr_pages = 1;
> atomic_long_add(nr_pages, &num_poisoned_pages);
>
> /*
--
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