linux-kernel - Re: [tip:sched/core] sched: Fix granularity of task

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Date:	Mon, 16 Nov 2009 11:44:17 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	mingo@...hat.com, hpa@...or.com, spencer@...ehost.com,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	tglx@...utronix.de, oleg@...hat.com, sgruszka@...hat.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched: Fix granularity of task_u/stime()

Ingo Molnar wrote:
> * tip-bot for Hidetoshi Seto <seto.hidetoshi@...fujitsu.com> wrote:
> 
>> Commit-ID:  761b1d26df542fd5eb348837351e4d2f3bc7bffe
>> Gitweb:     http://git.kernel.org/tip/761b1d26df542fd5eb348837351e4d2f3bc7bffe
>> Author:     Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
>> AuthorDate: Thu, 12 Nov 2009 13:33:45 +0900
>> Committer:  Ingo Molnar <mingo@...e.hu>
>> CommitDate: Thu, 12 Nov 2009 15:23:47 +0100
>>
>> sched: Fix granularity of task_u/stime()
>>
>> Originally task_s/utime() were designed to return clock_t but
>> later changed to return cputime_t by following commit:
> 
> i think this one causes this new warning in -tip:
> 
>  include/trace/events/timer.h:279: warning: format '%lu' 
>  expects type 'long unsigned int', but argument 4 has type 'cputime_t'

No.  I believe the warning was already there.
Following patch, based on tip:sched/core, will remove the warning.


Thanks,
H.Seto

===

Subject: [PATCH] trace: cputime_t is not always unsigned long

Type of cputime_t can be u64, unsigned long long or so on,
e.g. if kernel is configured with VIRT_CPU_ACCOUNTING=y.
So it can cause following warning:

 include/trace/events/timer.h:279: warning: format '%lu'
 expects type 'long unsigned int', but argument 4 has type 'cputime_t'

For printk(), it is better to use cputime_to_cputime64() and %llu,
since cputime64_t is always u64.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
---
 include/trace/events/timer.h |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
index 1844c48..8f4ec13 100644
--- a/include/trace/events/timer.h
+++ b/include/trace/events/timer.h
@@ -302,8 +302,8 @@ TRACE_EVENT(itimer_state,
 		__entry->interval_usec	= value->it_interval.tv_usec;
 	),
 
-	TP_printk("which %d, expires %lu, it_value %lu.%lu, it_interval %lu.%lu",
-		  __entry->which, __entry->expires,
+	TP_printk("which %d, expires %llu, it_value %lu.%lu, it_interval %lu.%lu",
+		  __entry->which, cputime_to_cputime64(__entry->expires),
 		  __entry->value_sec, __entry->value_usec,
 		  __entry->interval_sec, __entry->interval_usec)
 );
@@ -332,8 +332,8 @@ TRACE_EVENT(itimer_expire,
 		__entry->pid	= pid_nr(pid);
 	),
 
-	    TP_printk("which %d, pid %d, now %lu", __entry->which,
-		      (int) __entry->pid, __entry->now)
+	    TP_printk("which %d, pid %d, now %llu", __entry->which,
+		      (int) __entry->pid, cputime_to_cputime64(__entry->now))
 );
 
 #endif /*  _TRACE_TIMER_H */
-- 
1.6.5.2


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