From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f50.google.com (mail-pa0-f50.google.com [209.85.220.50]) by kanga.kvack.org (Postfix) with ESMTP id 34D1A6B0038 for ; Wed, 17 Sep 2014 11:33:33 -0400 (EDT) Received: by mail-pa0-f50.google.com with SMTP id eu11so954211pac.23 for ; Wed, 17 Sep 2014 08:33:32 -0700 (PDT) Received: from mx2.parallels.com (mx2.parallels.com. [199.115.105.18]) by mx.google.com with ESMTPS id xw3si35511597pac.75.2014.09.17.08.33.31 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Sep 2014 08:33:32 -0700 (PDT) From: Vladimir Davydov Subject: [PATCH] list_lru: get rid of ->active_nodes Date: Wed, 17 Sep 2014 19:33:18 +0400 Message-ID: <1410967998-29640-1-git-send-email-vdavydov@parallels.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Dave Chinner , Glauber Costa 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 really hot paths, so it doesn't seem we need such kind of optimization there. Signed-off-by: Vladimir Davydov Cc: Dave Chinner Cc: Glauber Costa --- include/linux/list_lru.h | 5 ++--- mm/list_lru.c | 10 +++------- 2 files changed, 5 insertions(+), 10 deletions(-) diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h index f3434533fbf8..447d39da1dc0 100644 --- a/include/linux/list_lru.h +++ b/include/linux/list_lru.h @@ -30,7 +30,6 @@ struct list_lru_node { struct list_lru { struct list_lru_node *node; - nodemask_t active_nodes; }; void list_lru_destroy(struct list_lru *lru); @@ -86,7 +85,7 @@ static inline unsigned long list_lru_count(struct list_lru *lru) long count = 0; int nid; - for_each_node_mask(nid, lru->active_nodes) + for_each_node_state(nid, N_MEMORY) count += list_lru_count_node(lru, nid); return count; @@ -126,7 +125,7 @@ list_lru_walk(struct list_lru *lru, list_lru_walk_cb isolate, long isolated = 0; int nid; - for_each_node_mask(nid, lru->active_nodes) { + for_each_node_state(nid, N_MEMORY) { isolated += list_lru_walk_node(lru, nid, isolate, cb_arg, &nr_to_walk); if (nr_to_walk <= 0) 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) -- 1.7.10.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org