linux-kernel - [patch 1/8] mm: memcg: remove unnecessary preemption disabling

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Message-Id: <1394587714-6966-2-git-send-email-hannes@cmpxchg.org>
Date:	Tue, 11 Mar 2014 21:28:27 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [patch 1/8] mm: memcg: remove unnecessary preemption disabling

lock_page_cgroup() disables preemption, remove explicit preemption
disabling for code paths holding this lock.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
Acked-by: Michal Hocko <mhocko@...e.cz>
---
 mm/memcontrol.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5b6b0039f725..393864c162ac 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -921,8 +921,6 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
 					 struct page *page,
 					 bool anon, int nr_pages)
 {
-	preempt_disable();
-
 	/*
 	 * Here, RSS means 'mapped anon' and anon's SwapCache. Shmem/tmpfs is
 	 * counted as CACHE even if it's on ANON LRU.
@@ -947,8 +945,6 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
 	}
 
 	__this_cpu_add(memcg->stat->nr_page_events, nr_pages);
-
-	preempt_enable();
 }
 
 unsigned long
@@ -3780,17 +3776,14 @@ void mem_cgroup_split_huge_fixup(struct page *head)
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
-static inline
-void mem_cgroup_move_account_page_stat(struct mem_cgroup *from,
-					struct mem_cgroup *to,
-					unsigned int nr_pages,
-					enum mem_cgroup_stat_index idx)
+static void mem_cgroup_move_account_page_stat(struct mem_cgroup *from,
+					      struct mem_cgroup *to,
+					      unsigned int nr_pages,
+					      enum mem_cgroup_stat_index idx)
 {
 	/* Update stat data for mem_cgroup */
-	preempt_disable();
 	__this_cpu_sub(from->stat->count[idx], nr_pages);
 	__this_cpu_add(to->stat->count[idx], nr_pages);
-	preempt_enable();
 }
 
 /**
-- 
1.9.0

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