projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1acce703 SRG |
1 | #!/bin/sh |
| 2 | # SPDX-License-Identifier: GPL-2.0 | |
| 3 | # description: Change the ringbuffer sub-buffer order | |
| 4 | # requires: buffer_subbuf_order | |
| 5 | # flags: instance | |
| 6 | ||
| 7 | get_buffer_data_size() { | |
| 8 | sed -ne 's/^.*data.*size:\([0-9][0-9]*\).*/\1/p' events/header_page | |
| 9 | } | |
| 10 | ||
| 11 | get_buffer_data_offset() { | |
| 12 | sed -ne 's/^.*data.*offset:\([0-9][0-9]*\).*/\1/p' events/header_page | |
| 13 | } | |
| 14 | ||
| 15 | get_event_header_size() { | |
| 16 | type_len=`sed -ne 's/^.*type_len.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event` | |
| 17 | time_len=`sed -ne 's/^.*time_delta.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event` | |
| 18 | array_len=`sed -ne 's/^.*array.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event` | |
| 19 | total_bits=$((type_len+time_len+array_len)) | |
| 20 | total_bits=$((total_bits+7)) | |
| 21 | echo $((total_bits/8)) | |
| 22 | } | |
| 23 | ||
| 24 | get_print_event_buf_offset() { | |
| 25 | sed -ne 's/^.*buf.*offset:\([0-9][0-9]*\).*/\1/p' events/ftrace/print/format | |
| 26 | } | |
| 27 | ||
| 28 | event_header_size=`get_event_header_size` | |
| 29 | print_header_size=`get_print_event_buf_offset` | |
| 30 | ||
| 31 | data_offset=`get_buffer_data_offset` | |
| 32 | ||
| 33 | marker_meta=$((event_header_size+print_header_size)) | |
| 34 | ||
| 35 | make_str() { | |
| 36 | cnt=$1 | |
| 37 | printf -- 'X%.0s' $(seq $cnt) | |
| 38 | } | |
| 39 | ||
| 40 | write_buffer() { | |
| 41 | size=$1 | |
| 42 | ||
| 43 | str=`make_str $size` | |
| 44 | ||
| 45 | # clear the buffer | |
| 46 | echo > trace | |
| 47 | ||
| 48 | # write the string into the marker | |
| 49 | echo $str > trace_marker | |
| 50 | ||
| 51 | echo $str | |
| 52 | } | |
| 53 | ||
| 54 | test_buffer() { | |
| 55 | orde=$1 | |
| 56 | page_size=$((4096<<order)) | |
| 57 | ||
| 58 | size=`get_buffer_data_size` | |
| 59 | ||
| 60 | # the size must be greater than or equal to page_size - data_offset | |
| 61 | page_size=$((page_size-data_offset)) | |
| 62 | if [ $size -lt $page_size ]; then | |
| 63 | exit fail | |
| 64 | fi | |
| 65 | ||
| 66 | # Now add a little more the meta data overhead will overflow | |
| 67 | ||
| 68 | str=`write_buffer $size` | |
| 69 | ||
| 70 | # Make sure the line was broken | |
| 71 | new_str=`awk ' /tracing_mark_write:/ { sub(/^.*tracing_mark_write: /,"");printf "%s", $0; exit}' trace` | |
| 72 | ||
| 73 | if [ "$new_str" = "$str" ]; then | |
| 74 | exit fail; | |
| 75 | fi | |
| 76 | ||
| 77 | # Make sure the entire line can be found | |
| 78 | new_str=`awk ' /tracing_mark_write:/ { sub(/^.*tracing_mark_write: /,"");printf "%s", $0; }' trace` | |
| 79 | ||
| 80 | if [ "$new_str" != "$str" ]; then | |
| 81 | exit fail; | |
| 82 | fi | |
| 83 | } | |
| 84 | ||
| 85 | ORIG=`cat buffer_subbuf_order` | |
| 86 | ||
| 87 | # Could test bigger orders than 3, but then creating the string | |
| 88 | # to write into the ring buffer takes too long | |
| 89 | for a in 0 1 2 3 ; do | |
| 90 | echo $a > buffer_subbuf_order | |
| 91 | test_buffer $a | |
| 92 | done | |
| 93 | ||
| 94 | echo $ORIG > buffer_subbuf_order | |
| 95 |