From: Lucas Stach <dev@lynxeye.de>
To: Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: Stephen Warren <swarren@wwwdotorg.org>,
Thierry Reding <thierry.reding@gmail.com>,
Alexandre Courbot <gnurou@gmail.com>,
linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org
Subject: [PATCH] clocksource/drivers/tegra: allow timer irq affinity change
Date: Sun, 25 Oct 2015 16:40:30 +0100 [thread overview]
Message-ID: <1445787630-13251-1-git-send-email-dev@lynxeye.de> (raw)
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@lynxeye.de>
---
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,
--
2.4.3
next reply other threads:[~2015-10-25 15:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-25 15:40 Lucas Stach [this message]
2015-10-27 10:14 ` Daniel Lezcano
2015-10-27 20:22 ` Lucas Stach
2015-10-27 20:54 ` Daniel Lezcano
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