linux-kernel - Re: [PATCH 2/2] cputime: introduce thread_group

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Date:	Tue, 01 Dec 2009 10:02:37 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Spencer Candland <spencer@...ehost.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Balbir Singh <balbir@...ibm.com>
Subject: Re: [PATCH 2/2] cputime: introduce thread_group_times()

Stanislaw Gruszka wrote:
> Idea is very good IMHO.

Thank you very much!

>>  #ifndef CONFIG_VIRT_CPU_ACCOUNTING
>> -	cputime_t prev_utime, prev_stime;
>> +	cputime_t prev_utime, prev_stime, prev_tgutime, prev_tgstime;
>>  #endif
> 
> I think the new values should be part of struct_signal (see below)

Good point.  I'll update patch to do so.

>>  /*
>> + * Must be called with siglock held.
>> + */
>> +void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
>> +{
>> +	struct task_cputime cputime;
>> +
>> +	__thread_group_times(p, &cputime);
>> +
>> +	if (ut)
>> +		*ut = cputime.utime;
>> +	if (st)
>> +		*st = cputime.stime;
> 
> No thread_group_times() nor task_times() is called with NULL arguments, we
> can get rid of "if ({u,s}t)" checks. Perhaps thread_group_times() should
> have "struct task_cputime" argument as it is wrapper for
> thread_group_cputime();

Removing "if ({u,s}t)" is OK with me.
I expect all thread_group_times() user should have no interest in members
of struct task_cputime other than {u,s}time, so I'd like to keep the
argument as is.


Thanks,
H.Seto

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