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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-kernel@vger.kernel.org
Cc: rt@linutronix.de, tglx@linutronix.de,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	Mel Gorman <mgorman@techsingularity.net>,
	Johannes Weiner <hannes@cmpxchg.org>,
	linux-mm@kvack.org
Subject: [PATCH 08/22] mm/vmstat: Avoid on each online CPU loops
Date: Sun, 27 Nov 2016 00:13:36 +0100
Message-ID: <20161126231350.10321-9-bigeasy@linutronix.de> (raw)
In-Reply-To: <20161126231350.10321-1-bigeasy@linutronix.de>

Both iterations over online cpus can be replaced by the proper node
specific functions.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-mm@kvack.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 mm/vmstat.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 0b63ffb5c407..b96dcec7e7d7 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1720,19 +1720,19 @@ static void __init start_shepherd_timer(void)
 
 static void __init init_cpu_node_state(void)
 {
-	int cpu;
+	int node;
 
-	for_each_online_cpu(cpu)
-		node_set_state(cpu_to_node(cpu), N_CPU);
+	for_each_online_node(node)
+		node_set_state(node, N_CPU);
 }
 
 static void vmstat_cpu_dead(int node)
 {
-	int cpu;
+	const struct cpumask *node_cpus;
 
-	for_each_online_cpu(cpu)
-		if (cpu_to_node(cpu) == node)
-			return;
+	node_cpus = cpumask_of_node(node);
+	if (cpumask_weight(node_cpus) > 0)
+		return;
 
 	node_clear_state(node, N_CPU);
 }
-- 
2.10.2

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  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20161126231350.10321-1-bigeasy@linutronix.de>
2016-11-26 23:13 ` [PATCH 07/22] mm/vmstat: Drop get_online_cpus() from init_cpu_node_state/vmstat_cpu_dead() Sebastian Andrzej Siewior
2016-11-28  9:24   ` Michal Hocko
2016-11-26 23:13 ` Sebastian Andrzej Siewior [this message]
2016-11-28  9:28   ` [PATCH 08/22] mm/vmstat: Avoid on each online CPU loops Michal Hocko
2016-11-29 14:08     ` Thomas Gleixner
2016-11-29 14:44       ` Michal Hocko
2016-11-29 14:51       ` [PATCH 08/22 v2] " Sebastian Andrzej Siewior
2016-11-29 15:20         ` Michal Hocko
2016-11-26 23:13 ` [PATCH 09/22] mm/vmstat: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-11-29 14:52   ` [PATCH 09/22 v2] " Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 10/22] mm/zsmalloc: " Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 11/22] mm/zswap: Convert dst-mem " Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 12/22] mm/zswap: Convert pool " Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 14/22] mm/compaction: Convert " Sebastian Andrzej Siewior

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