linux-kernel - Re: [tip:perf/core] perf probe: Add --list option for listing current probe events

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Date:	Wed, 02 Dec 2009 12:12:03 +0800
From:	Wang Liming <liming.wang@...driver.com>
To:	mingo@...hat.com, peterz@...radead.org, fweisbec@...il.com,
	mhiramat@...hat.com, linux-kernel@...r.kernel.org
CC:	acme@...hat.com, rostedt@...dmis.org, jbaron@...hat.com,
	tglx@...utronix.de, fche@...hat.com, jkenisto@...ibm.com,
	hch@...radead.org, ananth@...ibm.com, srikar@...ux.vnet.ibm.com,
	prasad@...ux.vnet.ibm.com
Subject: Re: [tip:perf/core] perf probe: Add --list option for listing current
 probe events

Hi Masami,

tip-bot for Masami Hiramatsu wrote:
> Commit-ID:  4de189fe6e5ad8241f6f8709d2e2ba4c3aeae33a
> Gitweb:     http://git.kernel.org/tip/4de189fe6e5ad8241f6f8709d2e2ba4c3aeae33a
> Author:     Masami Hiramatsu <mhiramat@...hat.com>
> AuthorDate: Mon, 30 Nov 2009 19:20:17 -0500
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Tue, 1 Dec 2009 08:20:02 +0100
> 
> perf probe: Add --list option for listing current probe events
> 
> Add --list option for listing currently defined probe events
> in the kernel. This shows events in below format;
> 
>  [group:event]	<perf-probe probe-definition>
> 
> for example:
> 
>  [probe:schedule_0]	schedule+30 cpu
> 
> Note that source file/line information is not supported yet.
> So even if you added a probe by line, it will be shown in
> <symbol+offset>.
...
> +
> +	/* Scan event and group name. */
> +	ret = sscanf(argv[0], "%c:%m[^/ \t]/%m[^ \t]",
> +		     &pr, group, event);
"%m" are typos?
> +	if (ret != 3)
> +		semantic_error("Failed to parse event name: %s", argv[0]);
> +	pr_debug("Group:%s Event:%s probe:%c\n", *group, *event, pr);
> +
> +	if (!pp)
> +		goto end;
> +
> +	pp->retprobe = (pr == 'r');
> +
> +	/* Scan function name and offset */
> +	ret = sscanf(argv[1], "%m[^+]+%d", &pp->function, &pp->offset);
the same error? fix attached below.

--

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index e42f3ac..8d46521 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -199,8 +199,8 @@ void parse_trace_kprobe_event(const char *str, char **group, 
char **event,
  		semantic_error("Too less arguments.");

  	/* Scan event and group name. */
-	ret = sscanf(argv[0], "%c:%m[^/ \t]/%m[^ \t]",
-		     &pr, group, event);
+	ret = sscanf(argv[0], "%c:%s[^/ \t]/%s[^ \t]",
+		     &pr, *group, *event);
  	if (ret != 3)
  		semantic_error("Failed to parse event name: %s", argv[0]);
  	pr_debug("Group:%s Event:%s probe:%c\n", *group, *event, pr);
@@ -211,7 +211,7 @@ void parse_trace_kprobe_event(const char *str, char **group, 
char **event,
  	pp->retprobe = (pr == 'r');

  	/* Scan function name and offset */
-	ret = sscanf(argv[1], "%m[^+]+%d", &pp->function, &pp->offset);
+	ret = sscanf(argv[1], "%s[^+]+%d", pp->function, &pp->offset);
  	if (ret == 1)
  		pp->offset = 0;




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