linux-kernel - Re: [RFC PATCH] sched_clock: also call register_current_timer

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Date:	Wed, 30 Apr 2014 15:01:32 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Will Deacon <will.deacon@....com>
CC:	Russell King <linux@....linux.org.uk>,
	John Stultz <john.stultz@...aro.org>,
	Theodore Ts o <tytso@....edu>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH] sched_clock: also call register_current_timer_delay()
 if possible

On 04/30/2014 02:48 PM, Will Deacon wrote:
> Hi Sebastian,

Hi Will,

> As long as sched_clock is guaranteed to be a fixed frequency, always-on
> clocksource then this could work, but it removes the flexibility of having
> a separate delay clock and sched clock (is this useful?).



> Looking at your patch, I noticed that we need to extend the
> register_current_timer_delay function to deal with clocks that aren't as
> wide as cycle_t, otherwise we don't delay() for long enough when the clock
> overflows (this is potentially already an issue for architected timers <
> 64-bit). Could you cook a patch for that please?

Sure, I would change the type from long to u64 and fix all users. Would
that be okay for you?

> 
> Will

Sebastian
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