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 13:35:39 +0800
From:	Wang Liming <liming.wang@...driver.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
CC:	mingo@...hat.com, peterz@...radead.org, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, 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

Masami Hiramatsu wrote:
> Wang Liming wrote:
>> 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?
> 
> No, %m is glibc extension of sscanf modifier, which allocate
> memory for scanned string in sscanf. You can see "man sscanf"
> if your glibc is not so old (hopefully..). Please refer below;
> 
> http://www.kernel.org/doc/man-pages/online/pages/man3/scanf.3.html#NOTES
Yes, my glibc is old so that "perf" can't be built. I'm using ubuntu 8.04.

Thanks a lot.
> 
> Anyway, thank you for reviewing!
> 
>>> +    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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