mlock: count attempts to free mlocked page

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 <lee.schermerhorn@hp.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 19 insertions, 0 deletions

diff --git a/mm/internal.h b/mm/internal.h
index 1cfbf2e2bc9e..e4e728bdf324 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -146,6 +146,22 @@ static inline void mlock_migrate_page(struct page *newpage, struct page *page)
         }
 }
 
+/*
+ * 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 vm_area_struct *v, struct page *p)
 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 */
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5886586fde6c..cfbadad75d1d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -454,6 +454,7 @@ static inline void __free_one_page(struct page *page,
 
 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) |
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 9e28abc0a0b9..9343227c5c60 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -689,6 +689,7 @@ static const char * const vmstat_text[] = {
         "unevictable_pgs_munlocked",
         "unevictable_pgs_cleared",
         "unevictable_pgs_stranded",
+        "unevictable_pgs_mlockfreed",
 #endif
 #endif
 };