Re: [RFC 0/4] Migrate timers away from cpuset on setting cpuset.quiesce

[Viresh Kumar]

On 24 April 2014 14:01, Daniel Sangorrin <daniel.sangorrin@xxxxxxxxxxxxx> wrote:
> In kernel/cpuset.c:quiesce_cpuset() you are using the function
> 'smp_call_function_any' which asks CPU cores in 'cpumask' to
> execute the functions 'hrtimer_quiesce_cpu' and 'timer_quiesce_cpu'.
>
> In the case above, 'cpumask' corresponds to core 0. Since I'm forcing
> the call to be executed from core 1 (by using taskset),
> an inter-processor interrupt is sent to core 0 for those functions
> to be executed.

Ahh, I understood that now :) .. So we are setting cpuset.quiesce from CPU1
which will do a IPI to get migrate_timers called on CPU0.. I was setting quiesce
from CPU0 only in my tests :)

But how does this work fine on x86 then? There we should have exactly same
problem, isn't it?

> Ok, thank you! I see that you have already fixed the problem. I tested
> your tree on ARM and now it seems to work correctly.

Yeah, I just pushed your changes as well at the time I wrote last mail :)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/