linux-kernel - Re: [PATCH] Read THREAD_CPUTIME clock from other processes.

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Date:	Fri, 24 Dec 2010 12:36:12 +0100
From:	Dario Faggioli <raistlin@...ux.it>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	torbenh <torbenh@....de>, john.stultz@...aro.org,
	roland@...hat.com, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Dhaval Giani <dhaval.giani@...il.com>
Subject: Re: [PATCH] Read THREAD_CPUTIME clock from other  processes.

On Thu, 2010-12-23 at 18:38 +0100, Dario Faggioli wrote: 
> > >  	rcu_read_lock();
> > >  	p = find_task_by_vpid(pid);
> > > -	if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ?
> > > -		   same_thread_group(p, current) : has_group_leader_pid(p))) {
> > > +	if (!p)
> > >  		error = -EINVAL;
> > > -	}
> > 
> > This changes the behaviour of sys_clock_settime(). Probably doesn't
> > matter since it does nothing, but perhaps !CPUCLOCK_PERTHREAD &&
> > !group_leader should result in -EINAVL as before.
> > 
> Oops, sure, you're right, I can fix this. :-)
> 
Mmm... This is trickier than I remembered expected. Apparently, glibc
always gives us a !CPUCLOCK_PERTHREAD() clockid, since it uses
MAKE_PROCESS_CLOCK() when clock_cpugetclockid is called.

Therefore, the take two of this thing will be a little different from
this first posting...

Thanks and Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://retis.sssup.it/people/faggioli -- dario.faggioli@...ber.org


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