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:

quoted

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@five ~]# perf test sigtrap
73: Sigtrap                                                         : Ok
[root@five ~]

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@google.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@google.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