linux-kernel - RE: [PATCH] perf tools: Fix the logic of thread_

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Date:	Tue, 11 Feb 2014 07:05:16 +0000
From:	Tony Lu <zlu@...era.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chris Metcalf <cmetcalf@...era.com>
Subject: RE: [PATCH] perf tools: Fix the logic of thread__fork

Thanks, I see. I was using the mainline tree, but it was just updated to 3.13-rc8.

>-----Original Message-----
>From: Arnaldo Carvalho de Melo [mailto:arnaldo.melo@...il.com] On Behalf Of
>Arnaldo Carvalho de Melo
>Sent: Monday, February 10, 2014 8:39 PM
>To: Tony Lu
>Cc: Peter Zijlstra; Paul Mackerras; Ingo Molnar; linux-kernel@...r.kernel.org;
>Chris Metcalf
>Subject: Re: [PATCH] perf tools: Fix the logic of thread__fork
>
>Em Mon, Feb 10, 2014 at 04:21:23AM +0000, Tony Lu escreveu:
>> Revert the logic of checking the return value of thread__set_comm().
>>
>> If thread__set_comm() returns zero without errors, we should not return
>> immediately, instead we should finish the rest of the clone work.
>> Otherwise, perf report would fail to resolve symbols sampled in forked
>> threads.
>
>You should mention against which tree your patch is supposed to be
>applied, in this case a fix was made in december:
>
>[acme@...andy linux]$ git show 8d00be815c05ed0f0202f606bab4e54f98fd3b30
>commit 8d00be815c05ed0f0202f606bab4e54f98fd3b30
>Author: David Ahern <dsahern@...il.com>
>Date:   Tue Dec 10 21:35:38 2013 -0700
>
>    perf tools: Fix inverted error verification bug in thread__fork
>
>    Commit 1902efe7f for the new comm infra added the wrong check for return
>    code on thread__set_comm. err == 0 is normal, so don't return at that
>    point unless err != 0.
>
>    Signed-off-by: David Ahern <dsahern@...il.com>
>    Cc: Frederic Weisbecker <fweisbec@...il.com>
>    Link:
>http://lkml.kernel.org/r/1386736538-23525-1-git-send-email-dsahern@gmail.co
>m
>    Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>
>> Signed-off-by: Zhigang Lu <zlu@...era.com>
>> ---
>>  tools/perf/util/thread.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
>> index 49eaf1d..e394861 100644
>> --- a/tools/perf/util/thread.c
>> +++ b/tools/perf/util/thread.c
>> @@ -126,7 +126,7 @@ int thread__fork(struct thread *thread, struct thread
>*parent, u64 timestamp)
>>  		if (!comm)
>>  			return -ENOMEM;
>>  		err = thread__set_comm(thread, comm, timestamp);
>> -		if (!err)
>> +		if (err)
>>  			return err;
>>  		thread->comm_set = true;
>>  	}
>> --
>> 1.7.1
--
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