Messages in this thread | | | Date | Wed, 27 Feb 2013 10:29:11 +0530 | Subject | Re: [PATCH 4/4] ARM: timer-sp: Set dynamic irq affinity | From | Viresh Kumar <> |
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On 27 February 2013 10:26, Santosh Shilimkar <santosh.shilimkar@ti.com> wrote: > On Wednesday 27 February 2013 03:47 AM, Daniel Lezcano wrote: >> >> From: Viresh Kumar <viresh.kumar@linaro.org> >> >> When a cpu goes to a deep idle state where its local timer is shutdown, it >> notifies the time frame work to use the broadcast timer instead. >> >> Unfortunately, the broadcast device could wake up any CPU, including an >> idle one >> which is not concerned by the wake up at all. >> > Broad-cast device will only open the CPU for which the timer IRQ > affined to. And infact with subject series the affinity also is > updated for the CPU which owns the last timer expiry event. > > What am I missing here ?
Dynamic affinity will work only if the following flag is set for a clock_event_device: CLOCK_EVT_FEAT_DYNIRQ, otherwise wakeup would happen on the cpu to which static affinity was set to.
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