linux-kernel - Re: [PATCH] perf: Add vm_ops->name call for mmap event name retrieval

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Date:	Mon, 14 Jul 2014 09:14:41 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jiri Olsa <jolsa@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH] perf: Add vm_ops->name call for mmap event name retrieval

On Mon, Jul 14, 2014 at 9:09 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, Jul 14, 2014 at 05:57:19PM +0200, Jiri Olsa wrote:
>> Following patch added another way to get mmap name:
>>   78d683e mm, fs: Add vm_ops->name as an alternative to arch_vma_name
>
> Please add to your .gitconfig:
>
> [core]
>         abbrev = 12
>
> Also, you failed to CC the two people involved in that.
>
>> The vdso vma mapping already switch to this and we no longer
>> get vdso name via arch_vma_name function. Adding this way to
>> the perf mmap event name retrieval code.
>>
>> Caught this via perf test:
>>
>>   $ sudo ./perf test -v 7
>>    7: Validate PERF_RECORD_* events & perf_sample fields     :
>>   --- start ---
>>
>> SNIP
>>
>>   PERF_RECORD_MMAP for [vdso] missing!
>>   test child finished with 255
>>   ---- end ----
>>   Validate PERF_RECORD_* events & perf_sample fields: FAILED!
>>
>> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
>> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
>> Cc: David Ahern <dsahern@...il.com>
>> Cc: Frederic Weisbecker <fweisbec@...il.com>
>> Cc: Ingo Molnar <mingo@...nel.org>
>> Cc: Namhyung Kim <namhyung@...nel.org>
>> Cc: Paul Mackerras <paulus@...ba.org>
>> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
>> ---
>>  kernel/events/core.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/kernel/events/core.c b/kernel/events/core.c
>> index 67e3b9c..4799676 100644
>> --- a/kernel/events/core.c
>> +++ b/kernel/events/core.c
>> @@ -5266,6 +5266,12 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
>>
>>               goto got_name;
>>       } else {
>> +             if (vma->vm_ops && vma->vm_ops->name) {
>> +                     name = (char *) vma->vm_ops->name(vma);
>> +                     if (name)
>> +                             goto cpy_name;
>> +             }
>> +

Looks good to me.  Sorry I missed that.

--Andy



>>               name = (char *)arch_vma_name(vma);
>>               if (name)
>>                       goto cpy_name;
>> --
>> 1.8.3.1
>>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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