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).
Signed-off-by: Naoya Horiguchi <[email protected]> --- mm/memory-failure.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git mmotm-2013-01-23-17-04.orig/mm/memory-failure.c mmotm-2013-01-23-17-04/mm/memory-failure.c index 9cab165..d5c50d6 100644 --- 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)) + nr_pages = 1 << compound_trans_order(hpage); + else /* normal page or thp */ + nr_pages = 1; atomic_long_add(nr_pages, &num_poisoned_pages); /* -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
