mm: remove vma arg from page_evictable

page_evictable(page, vma) is an irritant: almost all its callers pass
NULL for vma.  Remove the vma arg and use mlocked_vma_newpage(vma, page)
explicitly in the couple of places it's needed.  But in those places we
don't even need page_evictable() itself!  They're dealing with a freshly
allocated anonymous page, which has no "mapping" and cannot be mlocked yet.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Rik van Riel <riel@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michel Lespinasse <walken@google.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/vm/unevictable-lru.txt b/Documentation/vm/unevictable-lru.txt
index 323ff5d..a68db76 100644 (file)
--- a/Documentation/vm/unevictable-lru.txt
+++ b/Documentation/vm/unevictable-lru.txt
@@ -197,12 +197,8 @@ the pages are also "rescued" from the unevictable list in the process of
 freeing them.
 
 page_evictable() also checks for mlocked pages by testing an additional page
-flag, PG_mlocked (as wrapped by PageMlocked()).  If the page is NOT mlocked,
-and a non-NULL VMA is supplied, page_evictable() will check whether the VMA is
-VM_LOCKED via is_mlocked_vma().  is_mlocked_vma() will SetPageMlocked() and
-update the appropriate statistics if the vma is VM_LOCKED.  This method allows
-efficient "culling" of pages in the fault path that are being faulted in to
-VM_LOCKED VMAs.
+flag, PG_mlocked (as wrapped by PageMlocked()), which is set when a page is
+faulted into a VM_LOCKED vma, or found in a vma being VM_LOCKED.
 
 
 VMSCAN'S HANDLING OF UNEVICTABLE PAGES
@@ -651,7 +647,7 @@ PAGE RECLAIM IN shrink_*_list()
 -------------------------------
 
 shrink_active_list() culls any obviously unevictable pages - i.e.
-!page_evictable(page, NULL) - diverting these to the unevictable list.
+!page_evictable(page) - diverting these to the unevictable list.
 However, shrink_active_list() only sees unevictable pages that made it onto the
 active/inactive lru lists.  Note that these pages do not have PageUnevictable
 set - otherwise they would be on the unevictable list and shrink_active_list

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 388e706..68df9c1 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -281,7 +281,7 @@ static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
 }
 #endif
 
-extern int page_evictable(struct page *page, struct vm_area_struct *vma);
+extern int page_evictable(struct page *page);
 extern void check_move_unevictable_pages(struct page **, int nr_pages);
 
 extern unsigned long scan_unevictable_pages;

diff --git a/mm/internal.h b/mm/internal.h
index 7f72f24..78f25d6 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -168,9 +168,8 @@ static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
 }
 
 /*
- * Called only in fault path via page_evictable() for a new page
- * to determine if it's being mapped into a LOCKED vma.
- * If so, mark page as mlocked.
+ * Called only in fault path, to determine if a new page is being
+ * mapped into a LOCKED vma.  If it is, mark page as mlocked.
  */
 static inline int mlocked_vma_newpage(struct vm_area_struct *vma,
                                    struct page *page)

diff --git a/mm/ksm.c b/mm/ksm.c
index 14ee5cf..ecbc090 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1586,7 +1586,7 @@ struct page *ksm_does_need_to_copy(struct page *page,
                SetPageSwapBacked(new_page);
                __set_page_locked(new_page);
 
-               if (page_evictable(new_page, vma))
+               if (!mlocked_vma_newpage(vma, new_page))
                        lru_cache_add_lru(new_page, LRU_ACTIVE_ANON);
                else
                        add_page_to_unevictable_list(new_page);

diff --git a/mm/rmap.c b/mm/rmap.c
index 2877741..0d86433 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1080,7 +1080,7 @@ void page_add_new_anon_rmap(struct page *page,
        else
                __inc_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
        __page_set_anon_rmap(page, vma, address, 1);
-       if (page_evictable(page, vma))
+       if (!mlocked_vma_newpage(vma, page))
                lru_cache_add_lru(page, LRU_ACTIVE_ANON);
        else
                add_page_to_unevictable_list(page);

diff --git a/mm/swap.c b/mm/swap.c
index f76c76c..6310dc2 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -751,7 +751,7 @@ void lru_add_page_tail(struct page *page, struct page *page_tail,
 
        SetPageLRU(page_tail);
 
-       if (page_evictable(page_tail, NULL)) {
+       if (page_evictable(page_tail)) {
                if (PageActive(page)) {
                        SetPageActive(page_tail);
                        active = 1;

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b010efc..8b62730 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -553,7 +553,7 @@ void putback_lru_page(struct page *page)
 redo:
        ClearPageUnevictable(page);
 
-       if (page_evictable(page, NULL)) {
+       if (page_evictable(page)) {
                /*
                 * For evictable pages, we can use the cache.
                 * In event of a race, worst case is we end up with an
@@ -587,7 +587,7 @@ redo:
         * page is on unevictable list, it never be freed. To avoid that,
         * check after we added it to the list, again.
         */
-       if (lru == LRU_UNEVICTABLE && page_evictable(page, NULL)) {
+       if (lru == LRU_UNEVICTABLE && page_evictable(page)) {
                if (!isolate_lru_page(page)) {
                        put_page(page);
                        goto redo;
@@ -709,7 +709,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 
                sc->nr_scanned++;
 
-               if (unlikely(!page_evictable(page, NULL)))
+               if (unlikely(!page_evictable(page)))
                        goto cull_mlocked;
 
                if (!sc->may_unmap && page_mapped(page))
@@ -1217,7 +1217,7 @@ putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
 
                VM_BUG_ON(PageLRU(page));
                list_del(&page->lru);
-               if (unlikely(!page_evictable(page, NULL))) {
+               if (unlikely(!page_evictable(page))) {
                        spin_unlock_irq(&zone->lru_lock);
                        putback_lru_page(page);
                        spin_lock_irq(&zone->lru_lock);
@@ -1470,7 +1470,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
                page = lru_to_page(&l_hold);
                list_del(&page->lru);
 
-               if (unlikely(!page_evictable(page, NULL))) {
+               if (unlikely(!page_evictable(page))) {
                        putback_lru_page(page);
                        continue;
                }
@@ -3414,27 +3414,18 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 /*
  * page_evictable - test whether a page is evictable
  * @page: the page to test
- * @vma: the VMA in which the page is or will be mapped, may be NULL
  *
  * Test whether page is evictable--i.e., should be placed on active/inactive
- * lists vs unevictable list.  The vma argument is !NULL when called from the
- * fault path to determine how to instantate a new page.
+ * lists vs unevictable list.
  *
  * Reasons page might not be evictable:
  * (1) page's mapping marked unevictable
  * (2) page is part of an mlocked VMA
  *
  */
-int page_evictable(struct page *page, struct vm_area_struct *vma)
+int page_evictable(struct page *page)
 {
-
-       if (mapping_unevictable(page_mapping(page)))
-               return 0;
-
-       if (PageMlocked(page) || (vma && mlocked_vma_newpage(vma, page)))
-               return 0;
-
-       return 1;
+       return !mapping_unevictable(page_mapping(page)) && !PageMlocked(page);
 }
 
 #ifdef CONFIG_SHMEM
@@ -3472,7 +3463,7 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
                if (!PageLRU(page) || !PageUnevictable(page))
                        continue;
 
-               if (page_evictable(page, NULL)) {
+               if (page_evictable(page)) {
                        enum lru_list lru = page_lru_base_type(page);
 
                        VM_BUG_ON(PageActive(page));