On Thu, 21 Aug 2025 09:14:00 +0100 Vincent Donnefort vdonnefort@google.com wrote:
Exercise the tracefs interface for trace remote with a set of tests to check:
- loading/unloading (unloading.tc)
- reset (reset.tc)
- size changes (buffer_size.tc)
- event integrity (trace_pipe)
Cc: Shuah Khan skhan@linuxfoundation.org Cc: linux-kselftest@vger.kernel.org Signed-off-by: Vincent Donnefort vdonnefort@google.com
diff --git a/tools/testing/selftests/ftrace/test.d/remotes/buffer_size.tc b/tools/testing/selftests/ftrace/test.d/remotes/buffer_size.tc new file mode 100644 index 000000000000..60bf431ccc91 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/buffer_size.tc @@ -0,0 +1,24 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote buffer size
I think this test requires `remotes/`. If so, please add
# requires: remotes
Then this test will be skipped if it is not enabled.
+. $TEST_DIR/remotes/functions
+test_buffer_size() +{
- echo 0 > tracing_on
- assert_unloaded
- echo 4096 > buffer_size_kb
- echo 1 > tracing_on
- assert_loaded
- echo 0 > tracing_on
- echo 7 > buffer_size_kb
+}
+if [ -z "$SOURCE_REMOTE_TEST" ]; then
- set -e
- setup_remote_test
- test_buffer_size
+fi diff --git a/tools/testing/selftests/ftrace/test.d/remotes/functions b/tools/testing/selftests/ftrace/test.d/remotes/functions new file mode 100644 index 000000000000..504a495b3b1b --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/functions @@ -0,0 +1,33 @@ +# SPDX-License-Identifier: GPL-2.0
+setup_remote() +{
- local name=$1
- [ -e $TRACING_DIR/remotes/$name/write_event ] || exit_unresolved
- cd remotes/$name/
- echo 0 > tracing_on
- clear_trace
- echo 7 > buffer_size_kb
- echo 0 > events/enable
- echo 1 > events/$name/selftest/enable
- echo 1 > tracing_on
+}
+setup_remote_test() +{
- [ -d $TRACING_DIR/remotes/test/ ] || modprobe remote_test || exit_unresolved
- setup_remote "test"
+}
+assert_loaded() +{
- grep -q "(loaded)" buffer_size_kb
+}
+assert_unloaded() +{
- grep -q "(unloaded)" buffer_size_kb
+} diff --git a/tools/testing/selftests/ftrace/test.d/remotes/reset.tc b/tools/testing/selftests/ftrace/test.d/remotes/reset.tc new file mode 100644 index 000000000000..93d6eb2a807f --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/reset.tc @@ -0,0 +1,105 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote reset
Ditto.
+. $TEST_DIR/remotes/functions
+get_cpu_ids() +{
- sed -n 's/^processor\s*:\s*([0-9]+).*/\1/p' /proc/cpuinfo
+}
+dump_trace() +{
- output=$(mktemp /tmp/remote_test.XXXXXX)
For the test-local temporary working directory, can you use $TMPDIR instead of /tmp ? That directory is removed after running each test.
- cat trace_pipe > $output &
- pid=$!
- sleep 1
- kill -1 $pid
- echo $output
+}
+check_reset() +{
- write_event_path="write_event"
- taskset=""
- clear_trace
- # Is the buffer empty?
- output=$(dump_trace)
- test $(wc -l $output | cut -d ' ' -f1) -eq 0
- if $(echo $(pwd) | grep -q "per_cpu/cpu"); then
write_event_path="../../write_event"cpu_id=$(echo $(pwd) | sed -e 's/.*per_cpu\/cpu//')taskset="taskset -c $cpu_id"- fi
- rm $output
- # Can we properly write a new event?
- $taskset echo 7890 > $write_event_path
- output=$(dump_trace)
- test $(wc -l $output | cut -d ' ' -f1) -eq 1
- grep -q "id=7890" $output
- rm $output
+}
+test_global_interface() +{
- output=$(mktemp /tmp/remote_test.XXXXXX)
- # Confidence check
- echo 123456 > write_event
- output=$(dump_trace)
- grep -q "id=123456" $output
- rm $output
- # Reset single event
- echo 1 > write_event
- check_reset
- # Reset lost events
- for i in $(seq 1 10000); do
echo 1 > write_event- done
- check_reset
+}
+test_percpu_interface() +{
- [ "$(get_cpu_ids | wc -l)" -ge 2 ] || return 0
- for cpu in $(get_cpu_ids); do
taskset -c $cpu echo 1 > write_event- done
- check_non_empty=0
- for cpu in $(get_cpu_ids); do
cd per_cpu/cpu$cpu/if [ $check_non_empty -eq 0 ]; thencheck_resetcheck_non_empty=1else# Check we have only reset 1 CPUoutput=$(dump_trace)test $(wc -l $output | cut -d ' ' -f1) -eq 1rm $outputficd -- done
+}
+test_reset() +{
- test_global_interface
- test_percpu_interface
+}
+if [ -z "$SOURCE_REMOTE_TEST" ]; then
- set -e
- setup_remote_test
- test_reset
+fi diff --git a/tools/testing/selftests/ftrace/test.d/remotes/trace_pipe.tc b/tools/testing/selftests/ftrace/test.d/remotes/trace_pipe.tc new file mode 100644 index 000000000000..f4bd2b3655e0 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/trace_pipe.tc @@ -0,0 +1,57 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote trace_pipe
Ditto.
+. $TEST_DIR/remotes/functions
+test_trace_pipe() +{
- echo 0 > tracing_on
- assert_unloaded
- echo 1024 > buffer_size_kb
- echo 1 > tracing_on
- assert_loaded
- output=$(mktemp /tmp/remote_test.XXXXXX)
- cat trace_pipe > $output &
- pid=$!
- for i in $(seq 1 1000); do
echo $i > write_event- done
- echo 0 > tracing_on
- sleep 1
- kill $pid
- prev_ts=0 # TODO: Init with proper clock value
- prev_id=0
- # Only keep <timestamp> <id>
- sed -i -e 's/[[0-9]*]\s*([0-9]*.[0-9]*): [a-z]* id=([0-9]*)/\1 \2/' $output
- IFS=$'\n'
This fails checkbashisms test. Can you use printf for this?
IFS=$(printf "\n")
- for line in $(cat $output); do
ts=$(echo $line | cut -d ' ' -f 1)id=$(echo $line | cut -d ' ' -f 2)test $(echo "$ts>$prev_ts" | bc) -eq 1test $id -eq $((prev_id + 1))prev_ts=$tsprev_id=$id- done
- test $prev_id -eq 1000
- rm $output
+}
+if [ -z "$SOURCE_REMOTE_TEST" ]; then
- set -e
- setup_remote_test
- test_trace_pipe
+fi diff --git a/tools/testing/selftests/ftrace/test.d/remotes/unloading.tc b/tools/testing/selftests/ftrace/test.d/remotes/unloading.tc new file mode 100644 index 000000000000..99f97e100fde --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/remotes/unloading.tc @@ -0,0 +1,40 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Test trace remote unloading
Here, please add "requires: remotes" line.
Thank you,