mm: unmapped page migration avoid unmap+remap overhead

Page migration's __unmap_and_move(), and rmap's try_to_unmap(), were
created for use on pages almost certainly mapped into userspace.  But
nowadays compaction often applies them to unmapped page cache pages: which
may exacerbate contention on i_mmap_rwsem quite unnecessarily, since
try_to_unmap_file() makes no preliminary page_mapped() check.

Now check page_mapped() in __unmap_and_move(); and avoid repeating the
same overhead in rmap_walk_file() - don't remove_migration_ptes() when we
never inserted any.

(The PageAnon(page) comment blocks now look even sillier than before, but
clean that up on some other occasion.  And note in passing that
try_to_unmap_one() does not use a migration entry when PageSwapCache, so
remove_migration_ptes() will then not update that swap entry to newpage
pte: not a big deal, but something else to clean up later.)

Davidlohr remarked in "mm,fs: introduce helpers around the i_mmap_mutex"
conversion to i_mmap_rwsem, that "The biggest winner of these changes is
migration": a part of the reason might be all of that unnecessary taking
of i_mmap_mutex in page migration; and it's rather a shame that I didn't
get around to sending this patch in before his - this one is much less
useful after Davidlohr's conversion to rwsem, but still good.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 10 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index 01439953abf5..253474c22239 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -746,7 +746,7 @@ static int fallback_migrate_page(struct address_space *mapping,
  *  MIGRATEPAGE_SUCCESS - success
  */
 static int move_to_new_page(struct page *newpage, struct page *page,
-                                int remap_swapcache, enum migrate_mode mode)
+                                int page_was_mapped, enum migrate_mode mode)
 {
         struct address_space *mapping;
         int rc;
@@ -784,7 +784,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
                 newpage->mapping = NULL;
         } else {
                 mem_cgroup_migrate(page, newpage, false);
-                if (remap_swapcache)
+                if (page_was_mapped)
                         remove_migration_ptes(page, newpage);
                 page->mapping = NULL;
         }
@@ -798,7 +798,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
                                 int force, enum migrate_mode mode)
 {
         int rc = -EAGAIN;
-        int remap_swapcache = 1;
+        int page_was_mapped = 0;
         struct anon_vma *anon_vma = NULL;
 
         if (!trylock_page(page)) {
@@ -870,7 +870,6 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
                          * migrated but are not remapped when migration
                          * completes
                          */
-                        remap_swapcache = 0;
                 } else {
                         goto out_unlock;
                 }
@@ -910,13 +909,17 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
         }
 
         /* Establish migration ptes or remove ptes */
-        try_to_unmap(page, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
+        if (page_mapped(page)) {
+                try_to_unmap(page,
+                        TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
+                page_was_mapped = 1;
+        }
 
 skip_unmap:
         if (!page_mapped(page))
-                rc = move_to_new_page(newpage, page, remap_swapcache, mode);
+                rc = move_to_new_page(newpage, page, page_was_mapped, mode);
 
-        if (rc && remap_swapcache)
+        if (rc && page_was_mapped)
                 remove_migration_ptes(page, page);
 
         /* Drop an anon_vma reference if we took one */
@@ -1017,6 +1020,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
 {
         int rc = 0;
         int *result = NULL;
+        int page_was_mapped = 0;
         struct page *new_hpage;
         struct anon_vma *anon_vma = NULL;
 
@@ -1047,12 +1051,16 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
         if (PageAnon(hpage))
                 anon_vma = page_get_anon_vma(hpage);
 
-        try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
+        if (page_mapped(hpage)) {
+                try_to_unmap(hpage,
+                        TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
+                page_was_mapped = 1;
+        }
 
         if (!page_mapped(hpage))
-                rc = move_to_new_page(new_hpage, hpage, 1, mode);
+                rc = move_to_new_page(new_hpage, hpage, page_was_mapped, mode);
 
-        if (rc != MIGRATEPAGE_SUCCESS)
+        if (rc != MIGRATEPAGE_SUCCESS && page_was_mapped)
                 remove_migration_ptes(hpage, hpage);
 
         if (anon_vma)