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 13:20:14 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
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 02/20/2014 01:18 PM, Thomas Gleixner wrote:
> 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.
Other interfaces have flag arguments as well (for things like
TIMER_ABSTIME).

thanks
-john

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