linux-kernel - [PATCH] mm/vmstat: add note on safety of drain

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Message-Id: <1365729058-29514-1-git-send-email-cody@linux.vnet.ibm.com>
Date:	Thu, 11 Apr 2013 18:10:58 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH] mm/vmstat: add note on safety of drain_zonestat

---
 mm/vmstat.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index e1d8ed1..2b93877 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -495,6 +495,10 @@ void refresh_cpu_vm_stats(int cpu)
 			atomic_long_add(global_diff[i], &vm_stat[i]);
 }
 
+/*
+ * this is only called if !populated_zone(zone), which implies no other users of
+ * pset->vm_stat_diff[] exsist.
+ */
 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset)
 {
 	int i;
-- 
1.8.2.1

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