linux-kernel - Re: [PATCH V2 02/22] perf evlist: Add initial support for mmapping an Instruction Trace buffer

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Date:	Wed, 10 Dec 2014 14:28:37 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <peterz@...radead.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>
Subject: Re: [PATCH V2 02/22] perf evlist: Add initial support for mmapping
 an Instruction Trace buffer

On 09/12/14 15:24, Arnaldo Carvalho de Melo wrote:
> Em Wed, Nov 26, 2014 at 03:11:16PM +0200, Adrian Hunter escreveu:
>> On 25/11/14 18:57, Jiri Olsa wrote:
>>> On Thu, Nov 20, 2014 at 03:23:08PM +0200, Adrian Hunter wrote:
>>>
>>> SNIP
>>>
>>>> +			bool per_cpu __maybe_unused)
>>>> +{
>>>> +}
>>>> +
>>>>  static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
>>>>  {
>>>>  	if (evlist->mmap[idx].base != NULL) {
>>>> @@ -731,6 +759,7 @@ static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
>>>>  		evlist->mmap[idx].base = NULL;
>>>>  		evlist->mmap[idx].refcnt = 0;
>>>>  	}
>>>> +	itrace_mmap__munmap(&evlist->mmap[idx].itrace_mmap);
>>>>  }
>>>>  
>>>>  void perf_evlist__munmap(struct perf_evlist *evlist)
>>>> @@ -758,6 +787,7 @@ static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
>>>>  struct mmap_params {
>>>>  	int prot;
>>>>  	int mask;
>>>> +	struct itrace_mmap_params itrace_mp;
>>>>  };
>>>>  
>>>>  static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
>>>> @@ -788,6 +818,10 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
>>>>  		return -1;
>>>>  	}
>>>>  
>>>> +	if (itrace_mmap__mmap(&evlist->mmap[idx].itrace_mmap,
>>>> +			      &mp->itrace_mp, evlist->mmap[idx].base, fd))
>>>> +		return -1;
>>>> +
>>>
>>> so the itrace mmap is mmaped with right after event mmap for event fd..?
>>
>> The AUX area support is not implemented yet.  The AUX mmap size and offset
>> are set through the mmap page via aux_offset and aux_size.
> 
>>>From a quick look the user bits looks nicely done, step by step
> introducing stuff, but I would like to try it all together, where can I
> get the kernel bits so that I can try to find some machine where to test
> the whole thing?

Thanks for looking at the patches.

I am making a small change at the moment, so I will send a V3 and an
updated link to a git tree with all the patches - hopefully tomorrow.

> 
> - Arnaldo
>  
>>> is there any latest version of kernel changes, so I could check with
>>> kernel's perf_mmap? hum.. or you just use the same mmap?
>>
>> I re-based and pushed to:
>>
>> 	git://git.infradead.org/users/ahunter/linux-perf.git
>>
>> The missing AUX bits are added in this patch:
>>
>> 	http://git.infradead.org/users/ahunter/linux-perf.git/commitdiff/f1be40371b5600a5c4a20f88adff9595bdf5e7ec
> 
> 

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