On Wed, 13 Dec 2023 11:15:27 -0500 Steven Rostedt rostedt@goodmis.org wrote:
From: "Steven Rostedt (Google)" rostedt@goodmis.org
Add a test that writes longs strings, some over the size of the sub buffer and make sure that the entire content is there.
This looks good to me. and tested.
Acked-by: Masami Hiramatsu (Google) mhiramat@kernel.org Tested-by: Masami Hiramatsu (Google) mhiramat@kernel.org
Thank you,
Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org
Changes since v3: https://lore.kernel.org/linux-trace-kernel/20231212192317.0fb6b101@gandalf.l...
- Removed / */ from regex, to catch more than one space added to the beginning of the print. This would have caught the bug of using "%*s" instead of "%.*s". Luckily, the trace_printk test caught that.
.../ftrace/test.d/00basic/trace_marker.tc | 82 +++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100755 tools/testing/selftests/ftrace/test.d/00basic/trace_marker.tc
diff --git a/tools/testing/selftests/ftrace/test.d/00basic/trace_marker.tc b/tools/testing/selftests/ftrace/test.d/00basic/trace_marker.tc new file mode 100755 index 000000000000..9aa0db2b84fc --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/00basic/trace_marker.tc @@ -0,0 +1,82 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Basic tests on writing to trace_marker +# requires: trace_marker +# flags: instance
+get_buffer_data_size() {
- sed -ne 's/^.*data.*size:([0-9][0-9]*).*/\1/p' events/header_page
+}
+get_buffer_data_offset() {
- sed -ne 's/^.*data.*offset:([0-9][0-9]*).*/\1/p' events/header_page
+}
+get_event_header_size() {
- type_len=`sed -ne 's/^.*type_len.*:[^0-9]*([0-9][0-9]*).*/\1/p' events/header_event`
- time_len=`sed -ne 's/^.*time_delta.*:[^0-9]*([0-9][0-9]*).*/\1/p' events/header_event`
- array_len=`sed -ne 's/^.*array.*:[^0-9]*([0-9][0-9]*).*/\1/p' events/header_event`
- total_bits=$((type_len+time_len+array_len))
- total_bits=$((total_bits+7))
- echo $((total_bits/8))
+}
+get_print_event_buf_offset() {
- sed -ne 's/^.*buf.*offset:([0-9][0-9]*).*/\1/p' events/ftrace/print/format
+}
+event_header_size=`get_event_header_size` +print_header_size=`get_print_event_buf_offset`
+data_offset=`get_buffer_data_offset`
+marker_meta=$((event_header_size+print_header_size))
+make_str() {
cnt=$1- # subtract two for \n\0 as marker adds these
- cnt=$((cnt-2))
- printf -- 'X%.0s' $(seq $cnt)
+}
+write_buffer() {
- size=$1
- str=`make_str $size`
- # clear the buffer
- echo > trace
- # write the string into the marker
- echo -n $str > trace_marker
- echo $str
+}
+test_buffer() {
- size=`get_buffer_data_size`
- oneline_size=$((size-marker_meta))
- echo size = $size
- echo meta size = $marker_meta
- # Now add a little more the meta data overhead will overflow
- str=`write_buffer $size`
- # Make sure the line was broken
- new_str=`awk ' /tracing_mark_write:/ { sub(/^.*tracing_mark_write: /,"");printf "%s", $0; exit}' trace`
- if [ "$new_str" = "$str" ]; then
exit fail;- fi
- # Make sure the entire line can be found
- new_str=`awk ' /tracing_mark_write:/ { sub(/^.*tracing_mark_write: /,"");printf "%s", $0; }' trace`
- if [ "$new_str" != "$str" ]; then
exit fail;- fi
+}
+test_buffer
2.42.0