From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Schermerhorn Date: Wed, 30 Jul 2008 16:06:55 -0400 Message-Id: <20080730200655.24272.39854.sendpatchset@lts-notebook> In-Reply-To: <20080730200618.24272.31756.sendpatchset@lts-notebook> References: <20080730200618.24272.31756.sendpatchset@lts-notebook> Subject: [PATCH 6/7] mlocked-pages: patch reject resolution and event renames Sender: owner-linux-mm@kvack.org From: Lee Schermerhorn Return-Path: To: Andrew Morton Cc: linux-mm@kvack.org, KOSAKI Motohiro , Rik van Riel , Eric.Whitney@hp.com, KAMEZAWA Hiroyuki List-ID: Against: [27-rc1+]mmotm-080730-0356 Replaces: mlock-count-attempts-to-free-mlocked-page.patch in the mmotm series. Reworked to resolve patch conflicts introduced by other patches, including rename of unevictable lru/mlocked pages events. Allow free of mlock()ed pages. This shouldn't happen, but during developement, it occasionally did. This patch allows us to survive that condition, while keeping the statistics and events correct for debug. Signed-off-by: Lee Schermerhorn Signed-off-by: Rik van Riel Signed-off-by: Andrew Morton include/linux/vmstat.h | 1 + mm/internal.h | 17 +++++++++++++++++ mm/page_alloc.c | 1 + mm/vmstat.c | 1 + 4 files changed, 20 insertions(+) Index: linux-2.6.27-rc1-mmotm-30jul/include/linux/vmstat.h =================================================================== --- linux-2.6.27-rc1-mmotm-30jul.orig/include/linux/vmstat.h 2008-07-30 13:40:43.000000000 -0400 +++ linux-2.6.27-rc1-mmotm-30jul/include/linux/vmstat.h 2008-07-30 13:51:24.000000000 -0400 @@ -49,6 +49,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS UNEVICTABLE_PGMUNLOCKED, UNEVICTABLE_PGCLEARED, /* on COW, page truncate */ UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */ + UNEVICTABLE_MLOCKFREED, #endif NR_VM_EVENT_ITEMS }; Index: linux-2.6.27-rc1-mmotm-30jul/mm/internal.h =================================================================== --- linux-2.6.27-rc1-mmotm-30jul.orig/mm/internal.h 2008-07-30 13:46:31.000000000 -0400 +++ linux-2.6.27-rc1-mmotm-30jul/mm/internal.h 2008-07-30 13:52:28.000000000 -0400 @@ -146,6 +146,22 @@ static inline void mlock_migrate_page(st } } +/* + * free_page_mlock() -- clean up attempts to free and mlocked() page. + * Page should not be on lru, so no need to fix that up. + * free_pages_check() will verify... + */ +static inline void free_page_mlock(struct page *page) +{ + if (unlikely(TestClearPageMlocked(page))) { + unsigned long flags; + + local_irq_save(flags); + __dec_zone_page_state(page, NR_MLOCK); + __count_vm_event(UNEVICTABLE_MLOCKFREED); + local_irq_restore(flags); + } +} #else /* CONFIG_UNEVICTABLE_LRU */ static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) @@ -155,6 +171,7 @@ static inline int is_mlocked_vma(struct static inline void clear_page_mlock(struct page *page) { } static inline void mlock_vma_page(struct page *page) { } static inline void mlock_migrate_page(struct page *new, struct page *old) { } +static inline void free_page_mlock(struct page *page) { } #endif /* CONFIG_UNEVICTABLE_LRU */ Index: linux-2.6.27-rc1-mmotm-30jul/mm/page_alloc.c =================================================================== --- linux-2.6.27-rc1-mmotm-30jul.orig/mm/page_alloc.c 2008-07-30 13:35:55.000000000 -0400 +++ linux-2.6.27-rc1-mmotm-30jul/mm/page_alloc.c 2008-07-30 13:50:04.000000000 -0400 @@ -451,6 +451,7 @@ static inline void __free_one_page(struc static inline int free_pages_check(struct page *page) { + free_page_mlock(page); if (unlikely(page_mapcount(page) | (page->mapping != NULL) | (page_get_page_cgroup(page) != NULL) | Index: linux-2.6.27-rc1-mmotm-30jul/mm/vmstat.c =================================================================== --- linux-2.6.27-rc1-mmotm-30jul.orig/mm/vmstat.c 2008-07-30 13:48:12.000000000 -0400 +++ linux-2.6.27-rc1-mmotm-30jul/mm/vmstat.c 2008-07-30 13:52:03.000000000 -0400 @@ -672,6 +672,7 @@ static const char * const vmstat_text[] "unevictable_pgs_munlocked", "unevictable_pgs_cleared", "unevictable_pgs_stranded", + "unevictable_pgs_mlockfreed", #endif #endif }; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org