From mboxrd@z Thu Jan 1 00:00:00 1970 From: daniel.lezcano@linaro.org (Daniel Lezcano) Date: Tue, 14 Jan 2014 09:40:10 +0100 Subject: [PATCH] clocksource: arch_timer: Set dynamic irq affinity on mmio clockevent In-Reply-To: <1389048977-13502-1-git-send-email-sboyd@codeaurora.org> References: <1389048977-13502-1-git-send-email-sboyd@codeaurora.org> Message-ID: <52D4F7EA.6060200@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 01/06/2014 11:56 PM, Stephen Boyd wrote: > Set the CLOCK_EVT_FEAT_DYNIRQ flag on the memory mapped > clockevent so that we save power by waking up the CPU with the > next event when this timer is used in broadcast mode. > > Signed-off-by: Stephen Boyd > --- > drivers/clocksource/arm_arch_timer.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c > index 95fb944e15ee..57e823c44d2a 100644 > --- a/drivers/clocksource/arm_arch_timer.c > +++ b/drivers/clocksource/arm_arch_timer.c > @@ -277,6 +277,7 @@ static void __arch_timer_setup(unsigned type, > clk->set_next_event = arch_timer_set_next_event_phys; > } > } else { > + clk->features |= CLOCK_EVT_FEAT_DYNIRQ; > clk->name = "arch_mem_timer"; > clk->rating = 400; > clk->cpumask = cpu_all_mask; > Applied in my tree for 3.15. I am curious how much you saved in your current scenario. Did you had time to do some rough measurements ? Thanks -- Daniel -- Linaro.org ? Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog