linux-kernel - Re: [PATCH] kernel/fork.c: define reset_task

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Date:	Fri, 27 Feb 2009 23:50:10 -0300
From:	"Gustavo F. Padovan" <gustavo@....ic.unicamp.br>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/fork.c: define reset_task_cputimes()

On Thu, Feb 26, 2009 at 7:53 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Thu, 26 Feb 2009 02:17:55 -0300
> "Gustavo F. Padovan" <gustavo@....ic.unicamp.br> wrote:
>
>> Group all vars that receive cputime_zero in the same static function.
>> This also cleans the code.
>>
>> Signed-off-by: Gustavo F. Padovan <gustavo@....ic.unicamp.br>
>> ---
>>  include/linux/sched.h |   11 +++++++++++
>>  kernel/fork.c         |    8 +-------
>>  2 files changed, 12 insertions(+), 7 deletions(-)
>>
>> diff --git a/include/linux/sched.h b/include/linux/sched.h
>> index 8981e52..1a64587 100644
>> --- a/include/linux/sched.h
>> +++ b/include/linux/sched.h
>> @@ -1595,6 +1595,17 @@ extern cputime_t task_utime(struct task_struct *p);
>>  extern cputime_t task_stime(struct task_struct *p);
>>  extern cputime_t task_gtime(struct task_struct *p);
>>
>> +static inline void reset_task_cputimes(struct task_struct *t)
>> +{
>> +     t->utime = cputime_zero;
>> +     t->stime = cputime_zero;
>> +     t->gtime = cputime_zero;
>> +     t->utimescaled = cputime_zero;
>> +     t->stimescaled = cputime_zero;
>> +     t->prev_utime = cputime_zero;
>> +     t->prev_stime = cputime_zero;
>> +}
>> +
>>  /*
>>   * Per process flags
>>   */
>> diff --git a/kernel/fork.c b/kernel/fork.c
>> index a66fbde..9856abe 100644
>> --- a/kernel/fork.c
>> +++ b/kernel/fork.c
>> @@ -1031,13 +1031,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
>>       clear_tsk_thread_flag(p, TIF_SIGPENDING);
>>       init_sigpending(&p->pending);
>>
>> -     p->utime = cputime_zero;
>> -     p->stime = cputime_zero;
>> -     p->gtime = cputime_zero;
>> -     p->utimescaled = cputime_zero;
>> -     p->stimescaled = cputime_zero;
>> -     p->prev_utime = cputime_zero;
>> -     p->prev_stime = cputime_zero;
>> +     reset_task_cputimes(p);
>>
>>       p->default_timer_slack_ns = current->timer_slack_ns;
>>
>
> I cannot see much point in doing this, unless you have some other patch
> which adds a second caller of reset_task_cputimes()?

No. I don't have. So, cancel the patch.

>
>
>



-- 
Gustavo F. Padovan

Computer Engineering Student
Institute of Computing - IC
University of Campinas - UNICAMP

email: gustavo@....ic.unicamp.br
gtalk: gfpadovan@...il.com
mobile: +55 19 81030803
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