Re: [PATCH 4/4] ARM: timer-sp: Set dynamic irq affinity

From: Viresh Kumar
Date: Tue Feb 26 2013 - 23:59:16 EST

On 27 February 2013 10:26, Santosh Shilimkar <santosh.shilimkar@xxxxxx> wrote:
> On Wednesday 27 February 2013 03:47 AM, Daniel Lezcano wrote:
>> From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
>> 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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