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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Change the ringbuffer sub-buffer size
# requires: buffer_subbuf_size_kb
# 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() {
size_kb=$1
page_size=$((size_kb*1024))
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_size_kb`
# Could test bigger sizes than 32K, but then creating the string
# to write into the ring buffer takes too long
for a in 4 8 16 32 ; do
echo $a > buffer_subbuf_size_kb
test_buffer $a
done
echo $ORIG > buffer_subbuf_size_kb
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