linux-arkmicro/linux/tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc

#!/bin/sh
# description: Snapshot and tracing setting
# flags: instance

[ ! -f snapshot ] && exit_unsupported

echo "Set tracing off"
echo 0 > tracing_on

echo "Allocate and take a snapshot"
echo 1 > snapshot

# Since trace buffer is empty, snapshot is also empty, but allocated
grep -q "Snapshot is allocated" snapshot

echo "Ensure keep tracing off"
test `cat tracing_on` -eq 0

echo "Set tracing on"
echo 1 > tracing_on

echo "Take a snapshot again"
echo 1 > snapshot

echo "Ensure keep tracing on"
test `cat tracing_on` -eq 1

exit 0