linux-kernel - [PATCH v2] perf test: AMD IBS swfilt skip kernel tests if paranoia is >1

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Message-ID: <20250910155635.46187-1-irogers@google.com>
Date: Wed, 10 Sep 2025 08:56:35 -0700
From: Ian Rogers <irogers@...gle.com>
To: Ravi Bangoria <ravi.bangoria@....com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Collin Funk <collin.funk1@...il.com>, 
	James Clark <james.clark@...aro.org>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] perf test: AMD IBS swfilt skip kernel tests if paranoia is >1

If not root and the perf_event_paranoid is set >1 swfilt will fail to
open the event failing the test. Add check to skip the test in that
case.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
Remove incorrect sample count corrections
---
 tools/perf/tests/shell/amd-ibs-swfilt.sh | 51 ++++++++++++++++++------
 1 file changed, 38 insertions(+), 13 deletions(-)

diff --git a/tools/perf/tests/shell/amd-ibs-swfilt.sh b/tools/perf/tests/shell/amd-ibs-swfilt.sh
index 7045ec72ba4c..ebe1fedb897b 100755
--- a/tools/perf/tests/shell/amd-ibs-swfilt.sh
+++ b/tools/perf/tests/shell/amd-ibs-swfilt.sh
@@ -1,6 +1,10 @@
 #!/bin/bash
 # AMD IBS software filtering
 
+ParanoidAndNotRoot() {
+  [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
+}
+
 echo "check availability of IBS swfilt"
 
 # check if IBS PMU is available
@@ -16,6 +20,7 @@ if [ ! -f /sys/bus/event_source/devices/ibs_op/format/swfilt ]; then
 fi
 
 echo "run perf record with modifier and swfilt"
+err=0
 
 # setting any modifiers should fail
 perf record -B -e ibs_op//u -o /dev/null true 2> /dev/null
@@ -31,11 +36,17 @@ if [ $? -ne 0 ]; then
     exit 1
 fi
 
-# setting it with swfilt=1 should be fine
-perf record -B -e ibs_op/swfilt=1/k -o /dev/null true
-if [ $? -ne 0 ]; then
-    echo "[FAIL] IBS op PMU cannot handle swfilt for exclude_user"
-    exit 1
+if ! ParanoidAndNotRoot 1
+then
+    # setting it with swfilt=1 should be fine
+    perf record -B -e ibs_op/swfilt=1/k -o /dev/null true
+    if [ $? -ne 0 ]; then
+        echo "[FAIL] IBS op PMU cannot handle swfilt for exclude_user"
+        exit 1
+    fi
+else
+    echo "[SKIP] not root and perf_event_paranoid too high for exclude_user"
+    err=2
 fi
 
 # check ibs_fetch PMU as well
@@ -46,10 +57,16 @@ if [ $? -ne 0 ]; then
 fi
 
 # check system wide recording
-perf record -aB --synth=no -e ibs_op/swfilt/k -o /dev/null true
-if [ $? -ne 0 ]; then
-    echo "[FAIL] IBS op PMU cannot handle swfilt in system-wide mode"
-    exit 1
+if ! ParanoidAndNotRoot 1
+then
+    perf record -aB --synth=no -e ibs_op/swfilt/k -o /dev/null true
+    if [ $? -ne 0 ]; then
+        echo "[FAIL] IBS op PMU cannot handle swfilt in system-wide mode"
+        exit 1
+    fi
+else
+    echo "[SKIP] not root and perf_event_paranoid too high for exclude_user"
+    err=2
 fi
 
 echo "check number of samples with swfilt"
@@ -60,8 +77,16 @@ if [ ${kernel_sample} -ne 0 ]; then
     exit 1
 fi
 
-user_sample=$(perf record -e ibs_fetch/swfilt/k -o- true | perf script -i- -F misc | grep -c ^U)
-if [ ${user_sample} -ne 0 ]; then
-    echo "[FAIL] unexpected user samples: " ${user_sample}
-    exit 1
+if ! ParanoidAndNotRoot 1
+then
+    user_sample=$(perf record -e ibs_fetch/swfilt/k -o- true | perf script -i- -F misc | grep -c ^U)
+    if [ ${user_sample} -ne 0 ]; then
+        echo "[FAIL] unexpected user samples: " ${user_sample}
+        exit 1
+    fi
+else
+    echo "[SKIP] not root and perf_event_paranoid too high for exclude_user"
+    err=2
 fi
+
+exit $err
-- 
2.51.0.384.g4c02a37b29-goog