linux-kernel - [PATCH 8/8] rtla/timerlat: Test BPF mode

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Message-ID: <20250218145859.27762-9-tglozar@redhat.com>
Date: Tue, 18 Feb 2025 15:58:59 +0100
From: Tomas Glozar <tglozar@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	John Kacur <jkacur@...hat.com>,
	Luis Goncalves <lgoncalv@...hat.com>,
	Gabriele Monaco <gmonaco@...hat.com>,
	Clark Williams <williams@...hat.com>,
	Tomas Glozar <tglozar@...hat.com>
Subject: [PATCH 8/8] rtla/timerlat: Test BPF mode

Using the RTLA_NO_BPF environmental variable, execute rtla-timerlat
tests both with and without BPF support to cover both paths.

If rtla is built without BPF or the osnoise:timerlat_sample trace event
is not available, test only the non-BPF path.

Signed-off-by: Tomas Glozar <tglozar@...hat.com>
---
 tools/tracing/rtla/tests/timerlat.t | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/tracing/rtla/tests/timerlat.t b/tools/tracing/rtla/tests/timerlat.t
index e86f40e5749e..e939ff71d6be 100644
--- a/tools/tracing/rtla/tests/timerlat.t
+++ b/tools/tracing/rtla/tests/timerlat.t
@@ -4,7 +4,20 @@ source tests/engine.sh
 test_begin
 
 set_timeout 2m
+timerlat_sample_event='/sys/kernel/tracing/events/osnoise/timerlat_sample'
 
+if ldd $RTLA | grep libbpf >/dev/null && [ -d "$timerlat_sample_event" ]
+then
+	# rtla build with BPF and system supports BPF mode
+	no_bpf_options='0 1'
+else
+	no_bpf_options='1'
+fi
+
+# Do every test with and without BPF
+for option in $no_bpf_options
+do
+export RTLA_NO_BPF=$option
 check "verify help page" \
 	"timerlat --help"
 check "verify -s/--stack" \
@@ -23,5 +36,6 @@ check "verify -c/--cpus" \
 	"timerlat hist -c 0 -d 30s"
 check "hist test in nanoseconds" \
 	"timerlat hist -i 2 -c 0 -n -d 30s"
+done
 
 test_end
-- 
2.48.1