linux-kernel - Re: [PATCH] fix granularity of task

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Message-ID: <4AFB5019.7030901@jp.fujitsu.com>
Date:	Thu, 12 Nov 2009 09:00:25 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Spencer Candland <spencer@...ehost.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH] fix granularity of task_u/stime()

Stanislaw Gruszka wrote:
> On Tue, Nov 10, 2009 at 02:47:34PM +0900, Hidetoshi Seto wrote:
>> Remove casting to clock_t from task_u/stime(), and keep granularity of
>> cputime_t over the calculation.
>>
>> Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
>> ---
>>  kernel/sched.c |   21 ++++++++++++---------
>>  1 files changed, 12 insertions(+), 9 deletions(-)
>>
>> diff --git a/kernel/sched.c b/kernel/sched.c
>> index 28dd4f4..1632e82 100644
>> --- a/kernel/sched.c
>> +++ b/kernel/sched.c
>> @@ -5171,41 +5171,44 @@ cputime_t task_stime(struct task_struct *p)
>>  	return p->stime;
>>  }
>>  #else
>> +
>> +#ifndef nsecs_to_cputime
>> +# define nsecs_to_cputime(__nsecs) msecs_to_cputime((__nsecs) / NSEC_PER_MSEC)
>> +#endif
>> +
> 
> I would like to test, but unfortunately with the patch kernel not build
> on my system:
> 
> kernel/built-in.o: In function `task_utime':
> /usr/src/rhel5/linux-2.6/kernel/sched.c:5187: undefined reference to
> `__udivdi3'
> kernel/built-in.o: In function `task_stime':
> /usr/src/rhel5/linux-2.6/kernel/sched.c:5208: undefined reference to
> `__udivdi3'
> make: *** [.tmp_vmlinux1] Error 1

Wow, what arch?
Could you provide your .config?


Thanks,
H.Seto

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