linux-kernel - Re: [tip:sched/core] sched/cpuacct: Split usage accounting into user_usage and sys

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Date:	Wed, 6 Apr 2016 20:32:19 +1000
From:	Anton Blanchard <anton@...ba.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, tglx@...utronix.de,
	efault@....de, htejun@...il.com, linux-kernel@...r.kernel.org,
	tj@...nel.org, torvalds@...ux-foundation.org,
	zhaolei@...fujitsu.com, peterz@...radead.org,
	yangds.fnst@...fujitsu.com, hpa@...or.com,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [tip:sched/core] sched/cpuacct: Split usage accounting into
 user_usage and sys_usage

Hi,

> > >  void cpuacct_charge(struct task_struct *tsk, u64 cputime)
> > >  {
> > >  	struct cpuacct *ca;
> > > +	int index;
> > > +
> > > +	if (user_mode(task_pt_regs(tsk)))
> > > +		index = CPUACCT_USAGE_USER;
> > > +	else
> > > +		index = CPUACCT_USAGE_SYSTEM;

This is oopsing because PowerPC task_pt_regs() returns NULL for
kernel threads.

Anton