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| author |   Vladimir Davydov <vdavydov@parallels.com> | 2015-02-12 14:59:04 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-12 18:54:09 -0800 |
| commit | ff0b67ef5b1687692bc1fd3ce4bc3d1ff83587c7 (patch) | |
| tree | 9c4b001b4b814b1cfd90c195fe4b425d3342b19c /mm | |
| parent | memcg: add rwsem to synchronize against memcg_caches arrays relocation (diff) | |
| download | linux-dev-ff0b67ef5b1687692bc1fd3ce4bc3d1ff83587c7.tar.xz linux-dev-ff0b67ef5b1687692bc1fd3ce4bc3d1ff83587c7.zip | |
list_lru: get rid of ->active_nodes
The active_nodes mask allows us to skip empty nodes when walking over
list_lru items from all nodes in list_lru_count/walk. However, these
functions are never called from hot paths, so it doesn't seem we need
such kind of optimization there. OTOH, removing the mask will make it
easier to make list_lru per-memcg.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Greg Thelen <gthelen@google.com>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/list_lru.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/mm/list_lru.c b/mm/list_lru.c index f1a0db194173..07e198c77888 100644 --- a/mm/list_lru.c +++ b/mm/list_lru.c @@ -19,8 +19,7 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item) WARN_ON_ONCE(nlru->nr_items < 0); if (list_empty(item)) { list_add_tail(item, &nlru->list); - if (nlru->nr_items++ == 0) - node_set(nid, lru->active_nodes); + nlru->nr_items++; spin_unlock(&nlru->lock); return true; } @@ -37,8 +36,7 @@ bool list_lru_del(struct list_lru *lru, struct list_head *item) spin_lock(&nlru->lock); if (!list_empty(item)) { list_del_init(item); - if (--nlru->nr_items == 0) - node_clear(nid, lru->active_nodes); + nlru->nr_items--; WARN_ON_ONCE(nlru->nr_items < 0); spin_unlock(&nlru->lock); return true; @@ -90,8 +88,7 @@ restart: case LRU_REMOVED_RETRY: assert_spin_locked(&nlru->lock); case LRU_REMOVED: - if (--nlru->nr_items == 0) - node_clear(nid, lru->active_nodes); + nlru->nr_items--; WARN_ON_ONCE(nlru->nr_items < 0); isolated++; /* @@ -133,7 +130,6 @@ int list_lru_init_key(struct list_lru *lru, struct lock_class_key *key) if (!lru->node) return -ENOMEM; - nodes_clear(lru->active_nodes); for (i = 0; i < nr_node_ids; i++) { spin_lock_init(&lru->node[i].lock); if (key) |