linux-kernel - Re: [PATCH 2/4] perf_event: fix getting point

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Date:	Wed, 16 Dec 2009 09:03:47 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] perf_event: fix getting point



Frederic Weisbecker wrote:
> On Tue, Dec 15, 2009 at 07:20:26PM +0800, Xiao Guangrong wrote:
>> The point that got by raw_field_ptr() is point to @data offset not
>> tracepoint saved.
>>
>> Introduce raw_field_arry() to get arry data is tracepoint save
>> arry to it.
> 
> 
> Could you please rename it into raw_field_array()?
> I feel like...a kind of loss there :)
> 

Ah, it's my typo, i will fix it.

> 
> 
>> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
>> ---
>>  tools/perf/builtin-sched.c          |    3 +--
>>  tools/perf/util/trace-event-parse.c |   25 ++++++++++++++++++++++---
>>  tools/perf/util/trace-event.h       |    3 +++
>>  3 files changed, 26 insertions(+), 5 deletions(-)
>>
>> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
>> index d67f274..8df982e 100644
>> --- a/tools/perf/builtin-sched.c
>> +++ b/tools/perf/builtin-sched.c
>> @@ -630,8 +630,7 @@ static void test_calibrations(void)
>>  
>>  #define FILL_ARRAY(ptr, array, event, data)			\
>>  do {								\
>> -	void *__array = raw_field_ptr(event, #array, data);	\
>> -	memcpy(ptr.array, __array, sizeof(ptr.array));	\
>> +	raw_field_arry(event, #array, data, ptr.array, sizeof(ptr.array));\
>>  } while(0)
>>  
>>  #define FILL_COMMON_FIELDS(ptr, event, data)			\
>> diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
>> index c5c32be..b0ee64f 100644
>> --- a/tools/perf/util/trace-event-parse.c
>> +++ b/tools/perf/util/trace-event-parse.c
>> @@ -840,7 +840,7 @@ static int event_read_fields(struct event *event, struct format_field **fields)
>>  			field->flags |= FIELD_IS_ARRAY;
>>  
>>  			type = read_token(&token);
>> -		        while (strcmp(token, "]") != 0) {
>> +			while (strcmp(token, "]") != 0) {
>>  				if (last_type == EVENT_ITEM &&
>>  				    type == EVENT_ITEM)
>>  					len = 2;
>> @@ -1919,13 +1919,32 @@ raw_field_value(struct event *event, const char *name, void *data)
>>  
>>  void *raw_field_ptr(struct event *event, const char *name, void *data)
>>  {
>> +	void *ptr;
>> +	unsigned long long value;
>> +
>> +	value = raw_field_value(event, name, data);
>> +
>> +	if (!value)
>> +		return NULL;
>> +
>> +	memcpy(&ptr, &value, sizeof(ptr));
> 
> 
> 
> Could you perhaps just do
> 
> ptr = (void *)value; ?
> 

We can't do it in x86_32:
error: cast to pointer from integer of different size

Thanks,
Xiao
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