RE: [PATCH 2/3] smp: re-implement the kick_all_cpus_sync() with wake_up_if_idle()

[Liu, Chuansheng]

Hello Andy,

> -----Original Message-----
> From: Andy Lutomirski [mailto:luto@xxxxxxxxxxxxxx]
> Sent: Friday, August 15, 2014 11:41 PM
> To: Liu, Chuansheng
> Cc: Peter Zijlstra; Daniel Lezcano; Rafael J. Wysocki; Ingo Molnar;
> linux-pm@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Liu, Changcheng;
> Wang, Xiaoming; Chakravarty, Souvik K
> Subject: Re: [PATCH 2/3] smp: re-implement the kick_all_cpus_sync() with
> wake_up_if_idle()
> 
> On Fri, Aug 15, 2014 at 12:01 AM, Chuansheng Liu
> <chuansheng.liu@xxxxxxxxx> wrote:
> > Currently using smp_call_function() just woke up the corresponding
> > cpu, but can not break the polling idle loop.
> >
> > Here using the new sched API wake_up_if_idle() to implement it.
> 
> kick_all_cpus_sync has other callers, and those other callers want the
> old behavior.  I think this should be a new function.
> 
Yes, seems some current users of kick_all_cpus_sync() need IPI indeed,
will try to send out patch V2 with one new function.