linux-kernel - [RFC PATCH v2 2/2] perf tools: Don't set inherit bit for system wide evsel

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Date:	Mon, 26 Oct 2015 11:42:00 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<acme@...nel.org>, <ast@...mgrid.com>, <adrian.hunter@...el.com>
CC:	<linux-kernel@...r.kernel.org>, <pi3orama@....com>,
	<lizefan@...wei.com>, Wang Nan <wangnan0@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [RFC PATCH v2 2/2] perf tools: Don't set inherit bit for system wide evsel

Inherit bit is useless for a system wide evsel [1]. Further kernel
improvements are giving more constrain [2] on inherit events. This
patch set inherit bit to 0 for system wide evsels to avoid potential
constrains.

[1] http://lkml.kernel.org/r/20151022124142.GQ17308@twins.programming.kicks-ass.net
[2] http://lkml.kernel.org/r/1445559014-4667-1-git-send-email-ast@kernel.org

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Li Zefan <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/n/ebpf-0xsuv8wc1uwgj7qfylfolgqs@git.kernel.org
---
 tools/perf/util/evsel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 36ecf0e..2a5f0f8 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -736,7 +736,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
 
 	evsel->system_wide = opts->target.system_wide;
 	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
-	attr->inherit	    = !opts->no_inherit;
+	attr->inherit	    = !opts->no_inherit && !evsel->system_wide;
 
 	perf_evsel__set_sample_bit(evsel, IP);
 	perf_evsel__set_sample_bit(evsel, TID);
-- 
1.8.3.4

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