Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / include / linux / shrinker.h

diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
index 8f80f243fed9de0436aef2625fd5176e49a5b6a2..68c097077ef04af4533dd3ccc0272db8564bf269 100644 (file)
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -7,14 +7,15 @@
  *
  * The 'gfpmask' refers to the allocation we are currently trying to
  * fulfil.
- *
- * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
- * querying the cache size, so a fastpath for that case is appropriate.
  */
 struct shrink_control {
        gfp_t gfp_mask;
 
-       /* How many slab objects shrinker() should scan and try to reclaim */
+       /*
+        * How many objects scan_objects should scan and try to reclaim.
+        * This is reset before every call, so it is safe for callees
+        * to modify.
+        */
        unsigned long nr_to_scan;
 
        /* shrink from these nodes */
@@ -27,11 +28,6 @@ struct shrink_control {
 /*
  * A callback you can register to apply pressure to ageable caches.
  *
- * @shrink() should look through the least-recently-used 'nr_to_scan' entries
- * and attempt to free them up.  It should return the number of objects which
- * remain in the cache.  If it returns -1, it means it cannot do any scanning at
- * this time (eg. there is a risk of deadlock).
- *
  * @count_objects should return the number of freeable items in the cache. If
  * there are no objects to free or the number of freeable items cannot be
  * determined, it should return 0. No deadlock checks should be done during the
@@ -50,7 +46,6 @@ struct shrink_control {
  * @flags determine the shrinker abilities, like numa awareness
  */
 struct shrinker {
-       int (*shrink)(struct shrinker *, struct shrink_control *sc);
        unsigned long (*count_objects)(struct shrinker *,
                                       struct shrink_control *sc);
        unsigned long (*scan_objects)(struct shrinker *,