linux-kernel - Re: [PATCH V8 13/15] perf tools: expand perf_event__synthesize

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Date:	Wed, 24 Jul 2013 16:15:20 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH V8 13/15] perf tools: expand perf_event__synthesize_sample()

On 24/07/13 15:50, Jiri Olsa wrote:
> On Thu, Jul 18, 2013 at 01:42:55PM +0300, Adrian Hunter wrote:
> 
> SNIP
> 
>> @@ -1349,11 +1349,12 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
>>  }
>>  
>>  int perf_event__synthesize_sample(union perf_event *event, u64 type,
>> +				  u64 sample_regs_user,
>>  				  const struct perf_sample *sample,
>>  				  bool swapped)
>>  {
>>  	u64 *array;
>> -
>> +	size_t sz;
>>  	/*
>>  	 * used for cross-endian analysis. See git commit 65014ab3
>>  	 * for why this goofiness is needed.
>> @@ -1426,6 +1427,73 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type,
>>  		array++;
>>  	}
>>  
>> +	if (type & PERF_SAMPLE_READ) {
>> +		fprintf(stderr, "PERF_SAMPLE_READ is unsupported for now\n");
>> +		return -1;
>> +	}
>> +
>> +	if (type & PERF_SAMPLE_CALLCHAIN) {
>> +		sz = (sample->callchain->nr + 1) * sizeof(u64);
>> +		memcpy(array, sample->callchain, sz);
>> +		array = (void *)array + sz;
>> +	}
>> +
>> +	if (type & PERF_SAMPLE_RAW) {
>> +		u.val32[0] = sample->raw_size;
>> +		if (WARN_ONCE(swapped,
>> +			      "Endianness of raw data not corrected!\n")) {
>> +			/*
>> +			 * Inverse of what is done in perf_evsel__parse_sample
>> +			 */
>> +			u.val32[0] = bswap_32(u.val32[0]);
>> +			u.val32[1] = bswap_32(u.val32[1]);
>> +			u.val64 = bswap_64(u.val64);
>> +		}
>> +		*array = u.val64;
>> +		array = (void *)array + sizeof(u32);
>> +
>> +		memcpy(array, sample->raw_data, sample->raw_size);
>> +		array = (void *)array + sample->raw_size;
>> +	}
>> +
>> +	if (type & PERF_SAMPLE_BRANCH_STACK) {
>> +		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
>> +		sz += sizeof(u64);
>> +		memcpy(array, sample->branch_stack, sz);
>> +		array = (void *)array + sz;
>> +	}
>> +
>> +	if (type & PERF_SAMPLE_REGS_USER) {
>> +		if (sample->user_regs.regs && sample_regs_user) {
>> +			*array++ = sample_regs_user;
> 
> it's 'enum perf_sample_regs_abi' value that goes here ^^^
> 
> I guess for now it could be hardcoded like:
> 
> #if defined(__x86_64__)
> abi = PERF_SAMPLE_REGS_ABI_64
> #else
> #if defined(__i386__)
> abi = PERF_SAMPLE_REGS_ABI_64
> #endif
> WARN()
> #endif

Thanks for reviewing this.

Why isn't it better to leave it as a parameter?

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