linux-kernel - Re: [PATCH v3 2/6] hrtimer: Add support for deferrable timer into the hrtimer

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Date:	Thu, 20 Feb 2014 22:18:19 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	John Stultz <john.stultz@...aro.org>
cc:	Alexey Perevalov <a.perevalov@...sung.com>,
	linux-kernel@...r.kernel.org, anton@...sg.org,
	kyungmin.park@...sung.com, cw00.choi@...sung.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH v3 2/6] hrtimer: Add support for deferrable timer into
 the hrtimer

On Thu, 20 Feb 2014, John Stultz wrote:
> On 02/20/2014 12:40 AM, Alexey Perevalov wrote:
> > diff --git a/include/uapi/linux/time.h b/include/uapi/linux/time.h
> > index e75e1b6..bb8dc60 100644
> > --- a/include/uapi/linux/time.h
> > +++ b/include/uapi/linux/time.h
> > @@ -56,6 +56,9 @@ struct itimerval {
> >  #define CLOCK_BOOTTIME_ALARM		9
> >  #define CLOCK_SGI_CYCLE			10	/* Hardware specific */
> >  #define CLOCK_TAI			11
> > +#define CLOCK_REALTIME_DEFERRABLE	12
> > +#define CLOCK_MONOTONIC_DEFERRABLE	13
> > +#define CLOCK_BOOTTIME_DEFERRABLE	14
> 
> Adding the deferrable HRTIMER bases above is right, but I don't think we
> agreed on adding the _DEFERRABLE clockids.
> 
> I'd instead prefer you use add a new TIMER_DEFERABLE flags argument, and
> use the combination of the clockid + flag to decide which HRTIMER base
> is used.

And how does that work with anything else than timerfd? If we add
deferrable posix clocks then we add them for the other interfaces
which take a clockid as well.

Thanks,

	tglx
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