Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [10/16] HWPOISON: Handle hardware poisoned pages in try_to_unmap | Date | Wed, 27 May 2009 22:12:36 +0200 (CEST) |
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When a page has the poison bit set replace the PTE with a poison entry. This causes the right error handling to be done later when a process runs into it.
Also add a new flag to not do that (needed for the memory-failure handler later)
Signed-off-by: Andi Kleen <ak@linux.intel.com>
--- include/linux/rmap.h | 1 + mm/rmap.c | 9 ++++++++- 2 files changed, 9 insertions(+), 1 deletion(-)
Index: linux/mm/rmap.c =================================================================== --- linux.orig/mm/rmap.c 2009-05-27 21:14:21.000000000 +0200 +++ linux/mm/rmap.c 2009-05-27 21:14:21.000000000 +0200 @@ -801,7 +801,14 @@ /* Update high watermark before we lower rss */ update_hiwater_rss(mm); - if (PageAnon(page)) { + if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) { + if (PageAnon(page)) + dec_mm_counter(mm, anon_rss); + else if (!is_migration_entry(pte_to_swp_entry(*pte))) + dec_mm_counter(mm, file_rss); + set_pte_at(mm, address, pte, + swp_entry_to_pte(make_hwpoison_entry(page))); + } else if (PageAnon(page)) { swp_entry_t entry = { .val = page_private(page) }; if (PageSwapCache(page)) { Index: linux/include/linux/rmap.h =================================================================== --- linux.orig/include/linux/rmap.h 2009-05-27 21:14:21.000000000 +0200 +++ linux/include/linux/rmap.h 2009-05-27 21:14:21.000000000 +0200 @@ -93,6 +93,7 @@ TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */ TTU_IGNORE_ACCESS = (1 << 9), /* don't age */ + TTU_IGNORE_HWPOISON = (1 << 10),/* corrupted page is recoverable */ }; #define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)
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