diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/internal.h | 16 | ||||
| -rw-r--r-- | mm/mlock.c | 41 | ||||
| -rw-r--r-- | mm/vmstat.c | 5 |
3 files changed, 54 insertions, 8 deletions
diff --git a/mm/internal.h b/mm/internal.h index 48e32f790571..1cfbf2e2bc9e 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -101,7 +101,10 @@ static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) return 0; - SetPageMlocked(page); + if (!TestSetPageMlocked(page)) { + inc_zone_page_state(page, NR_MLOCK); + count_vm_event(UNEVICTABLE_PGMLOCKED); + } return 1; } @@ -128,12 +131,19 @@ static inline void clear_page_mlock(struct page *page) /* * mlock_migrate_page - called only from migrate_page_copy() to - * migrate the Mlocked page flag + * migrate the Mlocked page flag; update statistics. */ static inline void mlock_migrate_page(struct page *newpage, struct page *page) { - if (TestClearPageMlocked(page)) + if (TestClearPageMlocked(page)) { + unsigned long flags; + + local_irq_save(flags); + __dec_zone_page_state(page, NR_MLOCK); SetPageMlocked(newpage); + __inc_zone_page_state(newpage, NR_MLOCK); + local_irq_restore(flags); + } } diff --git a/mm/mlock.c b/mm/mlock.c index 8b478350a2a1..bce1b22c36c2 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -60,6 +60,8 @@ void __clear_page_mlock(struct page *page) return; } + dec_zone_page_state(page, NR_MLOCK); + count_vm_event(UNEVICTABLE_PGCLEARED); if (!isolate_lru_page(page)) { putback_lru_page(page); } else { @@ -69,6 +71,9 @@ void __clear_page_mlock(struct page *page) lru_add_drain_all(); if (!isolate_lru_page(page)) putback_lru_page(page); + else if (PageUnevictable(page)) + count_vm_event(UNEVICTABLE_PGSTRANDED); + } } @@ -80,8 +85,12 @@ void mlock_vma_page(struct page *page) { BUG_ON(!PageLocked(page)); - if (!TestSetPageMlocked(page) && !isolate_lru_page(page)) - putback_lru_page(page); + if (!TestSetPageMlocked(page)) { + inc_zone_page_state(page, NR_MLOCK); + count_vm_event(UNEVICTABLE_PGMLOCKED); + if (!isolate_lru_page(page)) + putback_lru_page(page); + } } /* @@ -106,9 +115,31 @@ static void munlock_vma_page(struct page *page) { BUG_ON(!PageLocked(page)); - if (TestClearPageMlocked(page) && !isolate_lru_page(page)) { - try_to_munlock(page); - putback_lru_page(page); + if (TestClearPageMlocked(page)) { + dec_zone_page_state(page, NR_MLOCK); + if (!isolate_lru_page(page)) { + int ret = try_to_munlock(page); + /* + * did try_to_unlock() succeed or punt? + */ + if (ret == SWAP_SUCCESS || ret == SWAP_AGAIN) + count_vm_event(UNEVICTABLE_PGMUNLOCKED); + + putback_lru_page(page); + } else { + /* + * We lost the race. let try_to_unmap() deal + * with it. At least we get the page state and + * mlock stats right. However, page is still on + * the noreclaim list. We'll fix that up when + * the page is eventually freed or we scan the + * noreclaim list. + */ + if (PageUnevictable(page)) + count_vm_event(UNEVICTABLE_PGSTRANDED); + else + count_vm_event(UNEVICTABLE_PGMUNLOCKED); + } } } diff --git a/mm/vmstat.c b/mm/vmstat.c index 6db2f6319313..9e28abc0a0b9 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -625,6 +625,7 @@ static const char * const vmstat_text[] = { "nr_active_file", #ifdef CONFIG_UNEVICTABLE_LRU "nr_unevictable", + "nr_mlock", #endif "nr_anon_pages", "nr_mapped", @@ -684,6 +685,10 @@ static const char * const vmstat_text[] = { "unevictable_pgs_culled", "unevictable_pgs_scanned", "unevictable_pgs_rescued", + "unevictable_pgs_mlocked", + "unevictable_pgs_munlocked", + "unevictable_pgs_cleared", + "unevictable_pgs_stranded", #endif #endif }; |