Messages in this thread Patch in this message | | | Date | Sat, 20 Jun 2009 11:16:17 +0800 | From | Wu Fengguang <> | Subject | [PATCH 09/15] HWPOISON: Handle hardware poisoned pages in try_to_unmap |
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From: Andi Kleen <ak@linux.intel.com>
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.
v2: add a new flag to not do that (needed for the memory-failure handler later) (Fengguang) v3: remove unnecessary is_migration_entry() test (Fengguang, Minchan)
Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: Wu Fengguang <fengguang.wu@intel.com> 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(-)
--- sound-2.6.orig/mm/rmap.c +++ sound-2.6/mm/rmap.c @@ -958,7 +958,14 @@ static int try_to_unmap_one(struct page /* 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 + 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)) { --- sound-2.6.orig/include/linux/rmap.h +++ sound-2.6/include/linux/rmap.h @@ -94,6 +94,7 @@ enum ttu_flags { 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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