linux-kernel - Re: [PATCH 1/7] posix-cpu-timers: don't account cpu timer after stopped thread runtime accounting

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Date:	Mon, 6 May 2013 22:57:38 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Olivier Langlois <olivier@...llion01.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/7] posix-cpu-timers: don't account cpu timer after
 stopped thread runtime accounting

>> +     /*
>> +      * After turning over se.sum_exec_runtime to sig->sum_sched_runtime
>> +      * in __exit_signal(), we must not account exec_runtime for consistency.
>> +      */
>> +     if (unlikely(!tsk->sighand))
>> +             return;
>
> Ok, if we want the clock and timer to be consistent, do we also want the same check in
> account_group_user_time() and account_group_system_time()? The task can still account
> a tick after autoreaping itself between release_task() and the final schedule().

You are right.

That said, current the man pages don't describe this linux specific
extensions. So, nobody
(glibc, ltp, and me) tested them. Please give me a couple of days.
I'll test and fix this features
too.

timer_create(2): http://man7.org/linux/man-pages/man2/timer_create.2.html
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