linux-kernel - Re: [BUG] perf report: garbage output with event grouping

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Date:	Wed, 26 Jun 2013 11:13:46 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [BUG] perf report: garbage output with event grouping

On Wed, Jun 26, 2013 at 10:42:49AM +0200, Stephane Eranian wrote:
> Hi,
> 
> 
> $ perf record -e 'cpi{cycles,instructions}' noploop 5
> 
> $ perf report --stdio --group
> # group: ^P^Q<A0>\{cycles,instructions}
> # ========
> #
> # Samples: 39K of event '^P^Q<A0>\ { cycles, instructions }'
> # Event count (approx.): 37782563692
> #
> #         Overhead  Command      Shared Object                       Symbol
> # ................  .......  .................  ...........................
> #
>     99.91%  99.98%  noploop  noploop            [.] main
>      0.06%   -nan%  noploop  [kernel.kallsyms]  [k] read_hpet
>      0.01%   0.01%  noploop  [kernel.kallsyms]  [k] __acct_update_integrals
>      0.01%   -nan%  noploop  [kernel.kallsyms]  [k] raise_softirq
>      0.01%   -nan%  noploop  [kernel.kallsyms]  [k] apic_timer_interrupt
>      0.01%   -nan%  noploop  [kernel.kallsyms]  [k] __do_softirq
>      0.01%   -nan%  noploop  [kernel.kallsyms]  [k] common_interrupt
>      0.00%   0.00%  noploop  [kernel.kallsyms]  [k] intel_pmu_enable_all
>      0.00%   0.01%  noploop  [kernel.kallsyms]  [k] cpuacct_account_field
>      0.00%   0.01%  noploop  [kernel.kallsyms]  [k] __local_bh_enable
> 
> 
> 1. The group name is garbage if not anonymous group.
> 2. arithmetic error in the overhead columns leading to NaN.
> 3. I assume the Overhead column order is the group event order. Is that right?

hi

1) attached patch fixies that for me
2) I cannot reproduce this one on acme's tree
3) right, and we do need event names there ;-)

---
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 738d3b8..673d98c 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2089,7 +2089,7 @@ static int process_group_desc(struct perf_file_section *section __maybe_unused,
 			evsel->leader = evsel;
 			/* {anon_group} is a dummy name */
 			if (strcmp(desc[i].name, "{anon_group}"))
-				evsel->group_name = desc[i].name;
+				evsel->group_name = strdup(desc[i].name);
 			evsel->nr_members = desc[i].nr_members;
 
 			if (i >= nr_groups || nr > 0) {
--
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