linux-kernel - Re: [PATCH] perf test: Add basic stress test for sigtrap handling

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Date:   Tue, 16 Nov 2021 14:57:33 +0100
From:   Marco Elver <elver@...gle.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Fabian Hemmer <copy@...y.sh>, Ian Rogers <irogers@...gle.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        kasan-dev@...glegroups.com
Subject: Re: [PATCH] perf test: Add basic stress test for sigtrap handling

On Tue, Nov 16, 2021 at 09:51AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Nov 15, 2021 at 12:28:23PM +0100, Marco Elver escreveu:
> > Add basic stress test for sigtrap handling as a perf tool built-in test.
> > This allows sanity checking the basic sigtrap functionality from within
> > the perf tool.
> 
> Works as root:
> 
> [root@...e ~]# perf test sigtrap
> 73: Sigtrap                                                         : Ok
> [root@...e ~]
> 
> Not for !root:
[...]
> FAILED sys_perf_event_open(): Permission denied
> test child finished with -1
> ---- end ----
> Sigtrap: FAILED!

Ah, that shouldn't be the case. It's missing exclude_kernel/hv, and this
test should work just fine as non-root. Please squash the below as well.
Let me know if you'd like a v2.

Ack for your change printing errors as well.

Thanks,
-- Marco

------ >8 ------

From: Marco Elver <elver@...gle.com>
Date: Tue, 16 Nov 2021 14:52:18 +0100
Subject: [PATCH] fixup! perf test: Add basic stress test for sigtrap handling

Exclude kernel/hypervisor so the test can run as non-root.

Signed-off-by: Marco Elver <elver@...gle.com>
---
 tools/perf/tests/sigtrap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/tests/sigtrap.c b/tools/perf/tests/sigtrap.c
index febfa1609356..e566f855bf74 100644
--- a/tools/perf/tests/sigtrap.c
+++ b/tools/perf/tests/sigtrap.c
@@ -46,6 +46,8 @@ static struct perf_event_attr make_event_attr(void)
 		.remove_on_exec = 1, /* Required by sigtrap. */
 		.sigtrap	= 1, /* Request synchronous SIGTRAP on event. */
 		.sig_data	= TEST_SIG_DATA,
+		.exclude_kernel = 1,
+		.exclude_hv	= 1,
 	};
 	return attr;
 }
-- 
2.34.0.rc1.387.gb447b232ab-goog