linux-kernel - Re: [PATCH -tip v3 04/10] perf probe: Query basic types from debuginfo

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Date:	Mon, 12 Apr 2010 14:45:08 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH -tip v3 04/10] perf probe: Query basic types from
	debuginfo

Em Mon, Apr 12, 2010 at 01:17:15PM -0400, Masami Hiramatsu escreveu:
> Query the basic type information (byte-size and signed-flag) from
> debuginfo and pass that to kprobe-tracer. This is especially useful
> for tracing the members of data structure, because each member has
> different byte-size on the memory.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Mike Galbraith <efault@....de>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> ---
> 
>  tools/perf/util/probe-event.c  |    9 +++++
>  tools/perf/util/probe-event.h  |    1 +
>  tools/perf/util/probe-finder.c |   78 ++++++++++++++++++++++++++++++++++++----
>  3 files changed, 80 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 19de8b7..05ca4a9 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -740,6 +740,13 @@ static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
>  		buf += ret;
>  		buflen -= ret;
>  	}
> +	/* Print argument type */
> +	if (arg->type) {
> +		ret = e_snprintf(buf, buflen, ":%s", arg->type);
> +		if (ret <= 0)
> +			return ret;
> +		buf += ret;
> +	}
>  
>  	return buf - tmp;
>  }
> @@ -848,6 +855,8 @@ void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
>  			free(tev->args[i].name);
>  		if (tev->args[i].value)
>  			free(tev->args[i].value);
> +		if (tev->args[i].type)
> +			free(tev->args[i].type);

It follows the existing style but as kfree, free() also can cope with
NULL pointers, so unconditionally calling free is a shorter form, but
this can be fixed later, possibily in a big cleanup in all of
tools/perf.

- Arnaldo
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