[PATCH 1/2] mm: Avoid putting a bad page back on the LRU v7 Prevent a page with a physical memory error from being placed back on the LRU. A new page flag (PG_memerror) is added if CONFIG_PAGEFLAGS_EXTENDED is defined. Signed-off-by: Russ Anderson <rja@xxxxxxx> Reviewed-by: Christoph Lameter <clameter@xxxxxxx> --- include/linux/page-flags.h | 18 ++++++++++++++++-- mm/migrate.c | 31 ++++++++++++++++++++++++++++++- mm/page_alloc.c | 13 ++++++++----- 3 files changed, 54 insertions(+), 8 deletions(-) Index: linux/mm/page_alloc.c =================================================================== --- linux.orig/mm/page_alloc.c 2008-07-18 15:15:48.000000000 -0500 +++ linux/mm/page_alloc.c 2008-07-18 15:16:09.000000000 -0500 @@ -602,10 +602,10 @@ static int prep_new_page(struct page *pa bad_page(page); /* - * For now, we report if PG_reserved was found set, but do not - * clear it, and do not allocate the page: as a safety net. + * For now, we report if PG_reserved or PG_memerror was found set, but + * do not clear it, and do not allocate the page: as a safety net. */ - if (PageReserved(page)) + if (PageReserved(page) || PageMemError(page)) return 1; page->flags &= ~(1 << PG_uptodate | 1 << PG_error | 1 << PG_reclaim | @@ -2475,8 +2475,11 @@ static void setup_zone_migrate_reserve(s continue; page = pfn_to_page(pfn); - /* Blocks with reserved pages will never free, skip them. */ - if (PageReserved(page)) + /* + * Blocks with reserved pages or memory errors will never + * free, skip them. + */ + if (PageReserved(page) || PageMemError(page)) continue; block_migratetype = get_pageblock_migratetype(page); Index: linux/mm/migrate.c =================================================================== --- linux.orig/mm/migrate.c 2008-07-18 15:15:48.000000000 -0500 +++ linux/mm/migrate.c 2008-07-18 15:16:09.000000000 -0500 @@ -720,7 +720,25 @@ unlock: * restored. */ list_del(&page->lru); - move_to_lru(page); + if (PageMemError(page)) + if (rc == 0) + /* + * A page with a memory error that has + * been migrated will not be moved to + * the LRU. + */ + goto move_newpage; + else + /* + * The page failed to migrate and will not + * be added to the bad page list. Clearing + * the error bit will allow another attempt + * to migrate if it gets another correctable + * error. + */ + ClearPageMemError(page); + + move_to_lru(page); } move_newpage: @@ -790,6 +808,17 @@ int migrate_pages(struct list_head *from } } } + + if (rc != 0) + list_for_each_entry_safe(page, page2, from, lru) + if (PageMemError(page)) + /* + * The page failed to migrate. Clearing + * the error bit will allow another attempt + * to migrate if it gets another correctable + * error. + */ + ClearPageMemError(page); rc = 0; out: if (!swapwrite) Index: linux/include/linux/page-flags.h =================================================================== --- linux.orig/include/linux/page-flags.h 2008-07-18 15:15:48.000000000 -0500 +++ linux/include/linux/page-flags.h 2008-07-18 15:16:09.000000000 -0500 @@ -84,6 +84,7 @@ enum pageflags { PG_private, /* If pagecache, has fs-private data */ PG_writeback, /* Page is under writeback */ #ifdef CONFIG_PAGEFLAGS_EXTENDED + PG_memerror, /* Page has a physical memory error */ PG_head, /* A head page */ PG_tail, /* A tail page */ #else @@ -132,15 +133,21 @@ static inline int TestSetPage##uname(str static inline int TestClearPage##uname(struct page *page) \ { return test_and_clear_bit(PG_##lname, &page->flags); } +#define PAGEFLAGMASK(uname, lname) \ +static inline int PAGEMASK_##uname(void) \ + { return (1 << PG_##lname); } #define PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \ - SETPAGEFLAG(uname, lname) CLEARPAGEFLAG(uname, lname) + SETPAGEFLAG(uname, lname) CLEARPAGEFLAG(uname, lname) \ + PAGEFLAGMASK(uname, lname) #define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \ __SETPAGEFLAG(uname, lname) __CLEARPAGEFLAG(uname, lname) #define PAGEFLAG_FALSE(uname) \ static inline int Page##uname(struct page *page) \ + { return 0; } \ +static inline int PAGEMASK_##uname(void) \ { return 0; } #define TESTSCFLAG(uname, lname) \ @@ -308,9 +315,16 @@ static inline void __ClearPageTail(struc #endif /* !PAGEFLAGS_EXTENDED */ +#ifdef CONFIG_PAGEFLAGS_EXTENDED +PAGEFLAG(MemError, memerror) +#else +PAGEFLAG_FALSE(MemError) +#endif + #define PAGE_FLAGS (1 << PG_lru | 1 << PG_private | 1 << PG_locked | \ 1 << PG_buddy | 1 << PG_writeback | \ - 1 << PG_slab | 1 << PG_swapcache | 1 << PG_active) + 1 << PG_slab | 1 << PG_swapcache | 1 << PG_active) |\ + PAGEMASK_MemError() /* * Flags checked in bad_page(). Pages on the free list should not have -- Russ Anderson, OS RAS/Partitioning Project Lead SGI - Silicon Graphics Inc rja@xxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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