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    Subject[PATCH v5 14/15] ringbuffer/selftest: Add basic selftest to test changing subbuf order
    From: "Steven Rostedt (Google)" <rostedt@goodmis.org>

    Add a self test that will write into the trace buffer with differ trace
    sub buffer order sizes.

    Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
    ---
    .../ftrace/test.d/00basic/ringbuffer_order.tc | 95 +++++++++++++++++++
    1 file changed, 95 insertions(+)
    create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_order.tc

    diff --git a/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_order.tc b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_order.tc
    new file mode 100644
    index 000000000000..ecbcc810e6c1
    --- /dev/null
    +++ b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_order.tc
    @@ -0,0 +1,95 @@
    +#!/bin/sh
    +# SPDX-License-Identifier: GPL-2.0
    +# description: Change the ringbuffer sub-buffer order
    +# requires: buffer_subbuf_order
    +# 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
    + 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 $str > trace_marker
    +
    + echo $str
    +}
    +
    +test_buffer() {
    + orde=$1
    + page_size=$((4096<<order))
    +
    + size=`get_buffer_data_size`
    +
    + # the size must be greater than or equal to page_size - data_offset
    + page_size=$((page_size-data_offset))
    + if [ $size -lt $page_size ]; then
    + exit fail
    + fi
    +
    + # 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
    +}
    +
    +ORIG=`cat buffer_subbuf_order`
    +
    +# Could test bigger orders than 3, but then creating the string
    +# to write into the ring buffer takes too long
    +for a in 0 1 2 3 ; do
    + echo $a > buffer_subbuf_order
    + test_buffer $a
    +done
    +
    +echo $ORIG > buffer_subbuf_order
    +
    --
    2.42.0


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