linux-kernel - [PATCH 5.17 757/772] perf evlist: Extend arch_evsel__must_be_in

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Date:   Tue,  7 Jun 2022 19:05:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        peterz@...radead.org, adrian.hunter@...el.com,
        alexander.shishkin@...el.com, acme@...nel.org, ak@...ux.intel.com,
        jolsa@...hat.com, mingo@...hat.com,
        linux-perf-users@...r.kernel.org
Subject: [PATCH 5.17 757/772] perf evlist: Extend arch_evsel__must_be_in_group to support hybrid systems

From: Zhengjun Xing <zhengjun.xing@...ux.intel.com>

commit e69a5c010246ca6a87c4e6f13d0a291954bdece8 upstream.

For the hybrid system, the "slots" event changes to "cpu_core/slots/", need
extend API arch_evsel__must_be_in_group() to support hybrid systems.

In the origin code, for hybrid system event "cpu_core/slots/", the output
of the API arch_evsel__must_be_in_group() is "false" (in fact,it should be
"true"). Currently only one API evsel__remove_from_group() calls it. In
evsel__remove_from_group(), it adds the second condition to check, so the
output of evsel__remove_from_group() still is correct. That's the reason
why there isn't an instant error. I'd like to fix the issue found in API
arch_evsel__must_be_in_group() in case someone else using the function in
the other place.

Fixes: d98079c05b5a ("perf evlist: Keep topdown counters in weak group")
Signed-off-by: Zhengjun Xing <zhengjun.xing@...ux.intel.com>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
Acked-by: Ian Rogers <irogers@...gle.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Link: https://lore.kernel.org/r/20220601152544.1842447-1-zhengjun.xing@linux.intel.com
Cc: peterz@...radead.org
Cc: adrian.hunter@...el.com
Cc: alexander.shishkin@...el.com
Cc: acme@...nel.org
Cc: ak@...ux.intel.com
Cc: jolsa@...hat.com
Cc: mingo@...hat.com
Cc: linux-kernel@...r.kernel.org
Cc: linux-perf-users@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/perf/arch/x86/util/evsel.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/perf/arch/x86/util/evsel.c
+++ b/tools/perf/arch/x86/util/evsel.c
@@ -38,6 +38,6 @@ bool arch_evsel__must_be_in_group(const
 		return false;
 
 	return evsel->name &&
-		(!strcasecmp(evsel->name, "slots") ||
+		(strcasestr(evsel->name, "slots") ||
 		 strcasestr(evsel->name, "topdown"));
 }