SHM_LOCKED pages are unevictable

Shmem segments locked into memory via shmctl(SHM_LOCKED) should not be
kept on the normal LRU, since scanning them is a waste of time and might
throw off kswapd's balancing algorithms.  Place them on the unevictable
LRU list instead.

Use the AS_UNEVICTABLE flag to mark address_space of SHM_LOCKed shared
memory regions as unevictable.  Then these pages will be culled off the
normal LRU lists during vmscan.

Add new wrapper function to clear the mapping's unevictable state when/if
shared memory segment is munlocked.

Add 'scan_mapping_unevictable_page()' to mm/vmscan.c to scan all pages in
the shmem segment's mapping [struct address_space] for evictability now
that they're no longer locked.  If so, move them to the appropriate zone
lru list.

Changes depend on [CONFIG_]UNEVICTABLE_LRU.

[kosaki.motohiro@jp.fujitsu.com: revert shm change]
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

6 files changed, 112 insertions, 5 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c61ba10768ea..40236290e2ae 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -700,10 +700,10 @@ static inline int page_mapped(struct page *page)
 extern void show_free_areas(void);
 
 #ifdef CONFIG_SHMEM
-int shmem_lock(struct file *file, int lock, struct user_struct *user);
+extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
 #else
 static inline int shmem_lock(struct file *file, int lock,
-                             struct user_struct *user)
+                            struct user_struct *user)
 {
         return 0;
 }
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 09164d2c5c27..4b6c4d8d26b8 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -40,14 +40,20 @@ static inline void mapping_set_unevictable(struct address_space *mapping)
         set_bit(AS_UNEVICTABLE, &mapping->flags);
 }
 
+static inline void mapping_clear_unevictable(struct address_space *mapping)
+{
+        clear_bit(AS_UNEVICTABLE, &mapping->flags);
+}
+
 static inline int mapping_unevictable(struct address_space *mapping)
 {
-        if (mapping && (mapping->flags & AS_UNEVICTABLE))
-                return 1;
-        return 0;
+        if (likely(mapping))
+                return test_bit(AS_UNEVICTABLE, &mapping->flags);
+        return !!mapping;
 }
 #else
 static inline void mapping_set_unevictable(struct address_space *mapping) { }
+static inline void mapping_clear_unevictable(struct address_space *mapping) { }
 static inline int mapping_unevictable(struct address_space *mapping)
 {
         return 0;
diff --git a/include/linux/swap.h b/include/linux/swap.h
index a2113044d20a..7edb4cbc29f9 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -232,12 +232,16 @@ static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
 
 #ifdef CONFIG_UNEVICTABLE_LRU
 extern int page_evictable(struct page *page, struct vm_area_struct *vma);
+extern void scan_mapping_unevictable_pages(struct address_space *);
 #else
 static inline int page_evictable(struct page *page,
                                                 struct vm_area_struct *vma)
 {
         return 1;
 }
+static inline void scan_mapping_unevictable_pages(struct address_space *mapping)
+{
+}
 #endif
 
 extern int kswapd_run(int nid);
diff --git a/ipc/shm.c b/ipc/shm.c
index e77ec698cf40..0add3fa5f547 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -737,6 +737,10 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
         case SHM_LOCK:
         case SHM_UNLOCK:
         {
+                struct file *uninitialized_var(shm_file);
+
+                lru_add_drain_all();  /* drain pagevecs to lru lists */
+
                 shp = shm_lock_check(ns, shmid);
                 if (IS_ERR(shp)) {
                         err = PTR_ERR(shp);
diff --git a/mm/shmem.c b/mm/shmem.c
index fc2ccf79a776..d38d7e61fcd0 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1477,12 +1477,16 @@ int shmem_lock(struct file *file, int lock, struct user_struct *user)
                 if (!user_shm_lock(inode->i_size, user))
                         goto out_nomem;
                 info->flags |= VM_LOCKED;
+                mapping_set_unevictable(file->f_mapping);
         }
         if (!lock && (info->flags & VM_LOCKED) && user) {
                 user_shm_unlock(inode->i_size, user);
                 info->flags &= ~VM_LOCKED;
+                mapping_clear_unevictable(file->f_mapping);
+                scan_mapping_unevictable_pages(file->f_mapping);
         }
         retval = 0;
+
 out_nomem:
         spin_unlock(&info->lock);
         return retval;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9babfbc1ddc8..dfb342e0db9b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2346,4 +2346,93 @@ int page_evictable(struct page *page, struct vm_area_struct *vma)
 
         return 1;
 }
+
+/**
+ * check_move_unevictable_page - check page for evictability and move to appropriate zone lru list
+ * @page: page to check evictability and move to appropriate lru list
+ * @zone: zone page is in
+ *
+ * Checks a page for evictability and moves the page to the appropriate
+ * zone lru list.
+ *
+ * Restrictions: zone->lru_lock must be held, page must be on LRU and must
+ * have PageUnevictable set.
+ */
+static void check_move_unevictable_page(struct page *page, struct zone *zone)
+{
+        VM_BUG_ON(PageActive(page));
+
+retry:
+        ClearPageUnevictable(page);
+        if (page_evictable(page, NULL)) {
+                enum lru_list l = LRU_INACTIVE_ANON + page_is_file_cache(page);
+                __dec_zone_state(zone, NR_UNEVICTABLE);
+                list_move(&page->lru, &zone->lru[l].list);
+                __inc_zone_state(zone, NR_INACTIVE_ANON + l);
+                __count_vm_event(UNEVICTABLE_PGRESCUED);
+        } else {
+                /*
+                 * rotate unevictable list
+                 */
+                SetPageUnevictable(page);
+                list_move(&page->lru, &zone->lru[LRU_UNEVICTABLE].list);
+                if (page_evictable(page, NULL))
+                        goto retry;
+        }
+}
+
+/**
+ * scan_mapping_unevictable_pages - scan an address space for evictable pages
+ * @mapping: struct address_space to scan for evictable pages
+ *
+ * Scan all pages in mapping.  Check unevictable pages for
+ * evictability and move them to the appropriate zone lru list.
+ */
+void scan_mapping_unevictable_pages(struct address_space *mapping)
+{
+        pgoff_t next = 0;
+        pgoff_t end   = (i_size_read(mapping->host) + PAGE_CACHE_SIZE - 1) >>
+                         PAGE_CACHE_SHIFT;
+        struct zone *zone;
+        struct pagevec pvec;
+
+        if (mapping->nrpages == 0)
+                return;
+
+        pagevec_init(&pvec, 0);
+        while (next < end &&
+                pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
+                int i;
+                int pg_scanned = 0;
+
+                zone = NULL;
+
+                for (i = 0; i < pagevec_count(&pvec); i++) {
+                        struct page *page = pvec.pages[i];
+                        pgoff_t page_index = page->index;
+                        struct zone *pagezone = page_zone(page);
+
+                        pg_scanned++;
+                        if (page_index > next)
+                                next = page_index;
+                        next++;
+
+                        if (pagezone != zone) {
+                                if (zone)
+                                        spin_unlock_irq(&zone->lru_lock);
+                                zone = pagezone;
+                                spin_lock_irq(&zone->lru_lock);
+                        }
+
+                        if (PageLRU(page) && PageUnevictable(page))
+                                check_move_unevictable_page(page, zone);
+                }
+                if (zone)
+                        spin_unlock_irq(&zone->lru_lock);
+                pagevec_release(&pvec);
+
+                count_vm_events(UNEVICTABLE_PGSCANNED, pg_scanned);
+        }
+
+}
 #endif