linux-kernel - [PATCH 1/2] nohz: add tick_nohz_full_set

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Message-ID: <1428078248-5425-1-git-send-email-cmetcalf@ezchip.com>
Date:	Fri, 3 Apr 2015 12:24:07 -0400
From:	<cmetcalf@...hip.com>
To:	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, <linux-kernel@...r.kernel.org>
CC:	Chris Metcalf <cmetcalf@...hip.com>
Subject: [PATCH 1/2] nohz: add tick_nohz_full_set_cpus() API

From: Chris Metcalf <cmetcalf@...hip.com>

This is useful, for example, to modify a cpumask indicating some
special nohz-type functionality so that the nohz cores are
automatically added to that set.

Signed-off-by: Chris Metcalf <cmetcalf@...hip.com>
---
 include/linux/tick.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/tick.h b/include/linux/tick.h
index d53ad4892a39..29456c443970 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -192,6 +192,12 @@ static inline void tick_nohz_full_clear_cpus(struct cpumask *mask)
 		cpumask_andnot(mask, mask, tick_nohz_full_mask);
 }
 
+static inline void tick_nohz_full_set_cpus(struct cpumask *mask)
+{
+	if (tick_nohz_full_enabled())
+		cpumask_or(mask, mask, tick_nohz_full_mask);
+}
+
 extern void __tick_nohz_full_check(void);
 extern void tick_nohz_full_kick(void);
 extern void tick_nohz_full_kick_cpu(int cpu);
@@ -201,6 +207,7 @@ extern void __tick_nohz_task_switch(struct task_struct *tsk);
 static inline bool tick_nohz_full_enabled(void) { return false; }
 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
 static inline void tick_nohz_full_clear_cpus(struct cpumask *mask) { }
+static inline void tick_nohz_full_set_cpus(struct cpumask *mask) { }
 static inline void __tick_nohz_full_check(void) { }
 static inline void tick_nohz_full_kick_cpu(int cpu) { }
 static inline void tick_nohz_full_kick(void) { }
-- 
2.1.2

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