linux-kernel - Re: [PATCH V6 02/25] perf evlist: Add initial support for mmapping an AUX area buffer

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Date:	Tue, 31 Mar 2015 12:09:51 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH V6 02/25] perf evlist: Add initial support for mmapping
 an AUX area buffer

On 24/03/15 13:07, Jiri Olsa wrote:
> On Mon, Mar 16, 2015 at 02:41:24PM +0200, Adrian Hunter wrote:
> 
> SNIP
> 
>> index 8d0b623..3cc7815 100644
>> --- a/tools/perf/util/evlist.c
>> +++ b/tools/perf/util/evlist.c
>> @@ -725,6 +725,34 @@ void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
>>  		perf_evlist__mmap_put(evlist, idx);
>>  }
>>  
>> +int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused,
>> +			       struct auxtrace_mmap_params *mp __maybe_unused,
>> +			       void *userpg __maybe_unused,
>> +			       int fd __maybe_unused)
>> +{
>> +	return 0;
>> +}
>> +
>> +void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused)
>> +{
>> +}
>> +
>> +void __weak auxtrace_mmap_params__init(
>> +			struct auxtrace_mmap_params *mp __maybe_unused,
>> +			off_t auxtrace_offset __maybe_unused,
>> +			unsigned int auxtrace_pages __maybe_unused,
>> +			bool auxtrace_overwrite __maybe_unused)
>> +{
>> +}
>> +
>> +void __weak auxtrace_mmap_params__set_idx(
>> +			struct auxtrace_mmap_params *mp __maybe_unused,
>> +			struct perf_evlist *evlist __maybe_unused,
>> +			int idx __maybe_unused,
>> +			bool per_cpu __maybe_unused)
>> +{
>> +}
> 
> IMO it's better to place the weak auxtrace_* functions in auxtrace header

They are there for python extension linking.

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