linux-kernel - Re: [PATCH] tracing/lockdep: report the time waited for a lock

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Date:	Thu, 28 May 2009 10:32:31 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] tracing/lockdep: report the time waited for a lock



On Mon, 6 Apr 2009, Frederic Weisbecker wrote:
> ---
>  include/trace/lockdep_event_types.h |   23 ++++++++++++++++++-----
>  kernel/lockdep.c                    |    8 ++++----
>  2 files changed, 22 insertions(+), 9 deletions(-)
> 
> diff --git a/include/trace/lockdep_event_types.h b/include/trace/lockdep_event_types.h
> index adccfcd..863f1e4 100644
> --- a/include/trace/lockdep_event_types.h
> +++ b/include/trace/lockdep_event_types.h
> @@ -32,11 +32,24 @@ TRACE_FORMAT(lock_contended,
>  	TP_FMT("%s", lock->name)
>  	);
>  
> -TRACE_FORMAT(lock_acquired,
> -	TP_PROTO(struct lockdep_map *lock, unsigned long ip),
> -	TP_ARGS(lock, ip),
> -	TP_FMT("%s", lock->name)
> -	);
> +TRACE_EVENT(lock_acquired,
> +	TP_PROTO(struct lockdep_map *lock, unsigned long ip, s64 waittime),
> +
> +	TP_ARGS(lock, ip, waittime),
> +
> +	TP_STRUCT__entry(
> +		__field(const char *, name)
> +		__field(unsigned long, wait_usec)
> +		__field(unsigned long, wait_nsec_rem)
> +	),
> +	TP_fast_assign(
> +		__entry->name = lock->name;
> +		__entry->wait_nsec_rem = do_div(waittime, NSEC_PER_USEC);

I know this is already accepted, but can you move the do_div into the 
print section.

Thanks,

-- Steve

> +		__entry->wait_usec = (unsigned long) waittime;
> +	),
> +	TP_printk("%s (%lu.%03lu us)", __entry->name, __entry->wait_usec,
> +				       __entry->wait_nsec_rem)
> +);
>  
--
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