[PATCH v6 20/26] perf test common: Only disable probes in clear_all_probes

[Ian Rogers]

Writing 0 to events/enable disables every tracepoint, breaking perf
sessions running in parallel. Disable just the kprobes and uprobes, an
enabled one would make clearing kprobe_events or uprobe_events fail with
EBUSY.

Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/perf/tests/shell/common/init.sh | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/common/init.sh b/tools/perf/tests/shell/common/init.sh
index cbfc78bec974..db89a5be95dc 100644
--- a/tools/perf/tests/shell/common/init.sh
+++ b/tools/perf/tests/shell/common/init.sh
@@ -130,9 +130,28 @@ check_uprobes_available()
 	test -e /sys/kernel/debug/tracing/uprobe_events
 }
 
+# Disable every kprobe and uprobe, listed as "TYPE:GROUP/EVENT ARGS...".
+disable_all_probes()
+{
+	PROBE_SPECS=`cat /sys/kernel/debug/tracing/kprobe_events \
+		/sys/kernel/debug/tracing/uprobe_events 2> /dev/null |
+		cut -d ' ' -f 1`
+	for PROBE_SPEC in $PROBE_SPECS
+	do
+		case "$PROBE_SPEC" in
+			*:*/*) ;;
+			*) continue ;;
+		esac
+		PROBE_ENABLE="/sys/kernel/debug/tracing/events/${PROBE_SPEC#*:}/enable"
+		test -e "$PROBE_ENABLE" && echo 0 > "$PROBE_ENABLE"
+	done
+}
+
 clear_all_probes()
 {
-	echo 0 > /sys/kernel/debug/tracing/events/enable
+	# Any enabled probe makes the clearing below fail with EBUSY. Unlike
+	# events/enable, this leaves other sessions' tracepoints alone.
+	disable_all_probes
 	check_kprobes_available && echo > /sys/kernel/debug/tracing/kprobe_events
 	check_uprobes_available && echo > /sys/kernel/debug/tracing/uprobe_events
 }
-- 
2.56.0.rc1.315.gc6ed9934b7-goog