linux-kernel - Re: [PATCH] perf tools: Fix annotation with kcore

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Date:	Tue, 11 Nov 2014 15:56:18 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf tools: Fix annotation with kcore

On 11/11/14 15:05, Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 11, 2014 at 12:04:54PM +0200, Adrian Hunter escreveu:
>> Patch "perf tools: Fix build-id matching on vmlinux"
> 
> So, I will check this, but please state for which branch this is
> supposed to be applied, i.e. does it fixes perf/urgent stuff and thus
> needs to go ASAP, or is this something that affects perf/core and thus
> can wait till I process more urgent stuff?

It is perf/core so it can wait.

> 
> - Arnaldo
> 
>> breaks annotation with kcore.  The problem is that
>> symbol__annotate() first gets the filename based on
>> the build-id which was previously not set.
>> This patch provides a quick fix, however there should
>> probably be only one way to determine the filename. e.g.
>> symbol__annotate() should use the same way as
>> dso__data_fd().
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>> ---
>>  tools/perf/util/annotate.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
>> index 7dabde1..873c877 100644
>> --- a/tools/perf/util/annotate.c
>> +++ b/tools/perf/util/annotate.c
>> @@ -915,6 +915,8 @@ int symbol__annotate(struct symbol *sym, struct map *map, size_t privsize)
>>  			return -ENOMEM;
>>  		}
>>  		goto fallback;
>> +	} else if (dso__is_kcore(dso)) {
>> +		goto fallback;
>>  	} else if (readlink(symfs_filename, command, sizeof(command)) < 0 ||
>>  		   strstr(command, "[kernel.kallsyms]") ||
>>  		   access(symfs_filename, R_OK)) {
>> -- 
>> 1.9.1
> 
> 

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