linux-kernel - [PATCH 04/69] clocksource/drivers/tegra: Allow timer irq affinity change

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Message-Id: <1450448302-27429-4-git-send-email-daniel.lezcano@linaro.org>
Date:	Fri, 18 Dec 2015 15:17:17 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	mingo@...nel.org, Lucas Stach <dev@...xeye.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-tegra@...r.kernel.org (open list:TEGRA ARCHITECTUR...)
Subject: [PATCH 04/69] clocksource/drivers/tegra: Allow timer irq affinity change

From: Lucas Stach <dev@...xeye.de>

Allow the timer core to change the smp affinity of the broadcast timer
irq by setting CLOCK_EVT_FEAT_DYNIRQ flag.

This reduces interrupt pressure and wakeups on CPU0 as well as vastly
reducing the number of timer broadcast IPIs.

Signed-off-by: Lucas Stach <dev@...xeye.de>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/tegra20_timer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c
index 6ebda11..38333ab 100644
--- a/drivers/clocksource/tegra20_timer.c
+++ b/drivers/clocksource/tegra20_timer.c
@@ -96,7 +96,8 @@ static struct clock_event_device tegra_clockevent = {
 	.name			= "timer0",
 	.rating			= 300,
 	.features		= CLOCK_EVT_FEAT_ONESHOT |
-				  CLOCK_EVT_FEAT_PERIODIC,
+				  CLOCK_EVT_FEAT_PERIODIC |
+				  CLOCK_EVT_FEAT_DYNIRQ,
 	.set_next_event		= tegra_timer_set_next_event,
 	.set_state_shutdown	= tegra_timer_shutdown,
 	.set_state_periodic	= tegra_timer_set_periodic,
-- 
1.9.1

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