From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751867AbbJYPrE (ORCPT ); Sun, 25 Oct 2015 11:47:04 -0400 Received: from ns.lynxeye.de ([87.118.118.114]:49308 "EHLO lynxeye.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751327AbbJYPrD (ORCPT ); Sun, 25 Oct 2015 11:47:03 -0400 X-Greylist: delayed 461 seconds by postgrey-1.27 at vger.kernel.org; Sun, 25 Oct 2015 11:47:02 EDT From: Lucas Stach To: Daniel Lezcano , Thomas Gleixner Cc: Stephen Warren , Thierry Reding , Alexandre Courbot , 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 Message-Id: <1445787630-13251-1-git-send-email-dev@lynxeye.de> X-Mailer: git-send-email 2.4.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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