linux-kernel - Re: [PATCH] process cputimer is moving faster than its corresponding clock

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Date:	Fri, 12 Apr 2013 11:18:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Olivier Langlois <olivier@...llion01.com>
Cc:	mingo@...hat.com, tglx@...utronix.de, fweisbec@...il.com,
	schwidefsky@...ibm.com, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] process cputimer is moving faster than its
 corresponding clock

On Wed, 2013-04-10 at 11:48 -0400, Olivier Langlois wrote:
> If it is important to stop it then the code will require a fix anyway.
> 
> 1.
> As you could start it
> indefinitely with 0 timers if calling posix_cpu_timer_set() does not
> end
> up arming a timer or
> 
> 2.
> 
> Having one periodic timer. The cputimer will be stopped in
> check_process_timers() to be immediatly restarted in
> posix_cpu_timer_schedule() every single time the timer will be fired.

OK, then yes that wants fixing. That was not intended.

The intent was starting the accounting when required and stopping it
when no longer needed.

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