linux-kernel - Re: [GIT PULL 00/11] perf/core improvements and fixes

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Date:	Fri, 20 May 2016 12:05:14 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>, He Kuang <hekuang@...wei.com>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Chris Ryder <chris.ryder@....com>,
	David Ahern <dsahern@...il.com>,
	Ekaterina Tumanova <tumanova@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Kan Liang <kan.liang@...el.com>,
	Mark Rutland <mark.rutland@....com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Milian Wolff <milian.wolff@...b.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Pekka Enberg <penberg@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	Wang Nan <wangnan0@...wei.com>,
	Will Deacon <will.deacon@....com>,
	Zefan Li <lizefan@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 00/11] perf/core improvements and fixes

Em Thu, May 19, 2016 at 07:21:22PM -0300, Arnaldo Carvalho de Melo escreveu:
> Hi Ingo,
> 
> 	Please consider pulling, this is on top of my previous pull
> request (perf-core-for-mingo-20160516).

So, here is a new pull req, removing the following patch, due to that
segfault you noticed while testing 'perf top' on an ubuntu system:
 
> He Kuang (2):
>       perf tools: Find vdso supporting cross-platform analysis

The new tag is perf-core-for-mingo-20160520.

Kuang, Ingo proposed the patch below to fix the problem he noticed
(notice the 'dso && ' part, as __dsos__find() may return NULL), but he
had several other issues with code touched by this patch, I'll try to
address those, please check the patch below and resubmit. 

- Arnaldo

 tools/perf/util/vdso.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
index 8f81c415723d..3a9321f83d00 100644
--- a/tools/perf/util/vdso.c
+++ b/tools/perf/util/vdso.c
@@ -293,12 +293,12 @@ static struct dso *machine__find_vdso(struct machine *machine,
 	switch (dso_type) {
 	case DSO__TYPE_32BIT:
 		dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO32, true);
-		if (!dso) {
-			dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO,
-					   true);
-			if (dso_type != dso__type(dso, machine))
-				dso = NULL;
-		}
+		if (dso)
+			break;
+
+		dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO, true);
+		if (dso && dso_type != dso__type(dso, machine))
+			dso = NULL;
 		break;
 	case DSO__TYPE_X32BIT:
 		dso = __dsos__find(&machine->dsos, DSO__NAME_VDSOX32, true);