tests/regression/tools/snapshots/test_kernel

   1 #!/bin/bash
   2 #
   3 # Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
   4 #
   5 # SPDX-License-Identifier: LGPL-2.1-only
   6
   7 TEST_DESC="Snapshots - Kernel tracing"
   8
   9 CURDIR=$(dirname $0)/
  10 TESTDIR=$CURDIR/../../..
  11 EVENT_NAME="sched_switch"
  12 SESSION_NAME=""
  13 CHANNEL_NAME="snapchan"
  14
  15 TRACE_PATH=$(mktemp --tmpdir -d tmp.test_snapshots_kernel_trace_path.XXXXXX)
  16
  17 NUM_TESTS=2061
  18
  19 source $TESTDIR/utils/utils.sh
  20
  21 function test_kernel_local_snapshot ()
  22 {
  23         diag "Test local kernel snapshots"
  24         create_lttng_session_no_output $SESSION_NAME
  25         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  26         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
  27         start_lttng_tracing_ok $SESSION_NAME
  28         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
  29         lttng_snapshot_record $SESSION_NAME
  30         stop_lttng_tracing_ok $SESSION_NAME
  31         destroy_lttng_session_ok $SESSION_NAME
  32
  33         # Validate test
  34         validate_trace_path_kernel_snapshot "$TRACE_PATH" "" "snapshot-1" 0 ""
  35         validate_trace $EVENT_NAME $TRACE_PATH/
  36         if [ $? -eq 0 ]; then
  37                 # Only delete if successful
  38                 rm -rf $TRACE_PATH
  39         fi
  40 }
  41
  42 function test_kernel_local_snapshot_after_stop ()
  43 {
  44         diag "Test local kernel snapshots after stop"
  45         create_lttng_session_no_output $SESSION_NAME
  46         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  47         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
  48         start_lttng_tracing_ok $SESSION_NAME
  49         stop_lttng_tracing_ok $SESSION_NAME
  50         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
  51         lttng_snapshot_record $SESSION_NAME
  52         destroy_lttng_session_ok $SESSION_NAME
  53
  54         # Validate test
  55         validate_trace $EVENT_NAME $TRACE_PATH/
  56         if [ $? -eq 0 ]; then
  57                 # Only delete if successful
  58                 rm -rf $TRACE_PATH
  59         else
  60                 break
  61         fi
  62 }
  63
  64 function test_kernel_local_snapshot_append_to_metadata ()
  65 {
  66         local EVENT1=sched_switch
  67         local EVENT2=sched_process_exit
  68
  69         diag "Test local kernel snapshots with one event $EVENT1"
  70         create_lttng_session_no_output $SESSION_NAME
  71         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  72         lttng_enable_kernel_event $SESSION_NAME $EVENT1 $CHANNEL_NAME
  73         start_lttng_tracing_ok $SESSION_NAME
  74         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
  75
  76         # first snapshot with only 1 event
  77         lttng_snapshot_record $SESSION_NAME
  78         validate_trace $EVENT_NAME $TRACE_PATH/
  79         if [ $? -eq 0 ]; then
  80                 # Only delete if successful
  81                 rm -rf $TRACE_PATH
  82         else
  83                 break
  84         fi
  85
  86         diag "Adding event $EVENT2"
  87         # second snapshot with 2 events
  88         lttng_enable_kernel_event $SESSION_NAME $EVENT2 $CHANNEL_NAME
  89         rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
  90         lttng_snapshot_record $SESSION_NAME
  91         validate_trace "${EVENT1},${EVENT2}" $TRACE_PATH/
  92         if [ $? -eq 0 ]; then
  93                 # Only delete if successful
  94                 rm -rf $TRACE_PATH
  95         else
  96                 break
  97         fi
  98
  99         stop_lttng_tracing_ok $SESSION_NAME
 100         destroy_lttng_session_ok $SESSION_NAME
 101 }
 102
 103 function generate_filter_events_cpu0()
 104 {
 105         # Generate many events (fill buffers) on CPU 0
 106         taskset 0x00000001 /bin/echo -n "$1" > /proc/lttng-test-filter-event 2> /dev/null
 107 }
 108
 109 function test_kernel_local_snapshot_discard ()
 110 {
 111         diag "Test local kernel snapshots with small discard buffers"
 112
 113         local event_name="lttng_test_filter_event"
 114
 115         modprobe lttng-test
 116         create_lttng_session_no_output $SESSION_NAME
 117         enable_lttng_mmap_discard_small_kernel_channel $SESSION_NAME \
 118                         $CHANNEL_NAME
 119         enable_kernel_lttng_event_ok $SESSION_NAME $event_name $CHANNEL_NAME
 120         start_lttng_tracing_ok $SESSION_NAME
 121         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 122
 123         generate_filter_events_cpu0 10000
 124
 125         # Take first snapshot, remember first line.
 126         lttng_snapshot_record $SESSION_NAME
 127         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 128         diag "First line (1st snapshot): $FIRST_LINE"
 129
 130         rm -rf $TRACE_PATH
 131
 132         # Fill CPU 0's buffer and overwrite previous contents
 133         generate_filter_events_cpu0 10000
 134
 135         # Take 2nd snapshot, compare first line. In discard mode, they
 136         # should still be the same.
 137         lttng_snapshot_record $SESSION_NAME
 138         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 139         diag "First line (2nd snapshot): $FIRST_LINE"
 140         rm -rf $TRACE_PATH
 141
 142         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 143                 fail "First snapshot event do not match"
 144         else
 145                 pass "First snapshot event match"
 146         fi
 147
 148         stop_lttng_tracing_ok $SESSION_NAME
 149         destroy_lttng_session_ok $SESSION_NAME
 150         modprobe --remove lttng-test
 151 }
 152
 153 function test_kernel_local_snapshot_overwrite_small_buffers ()
 154 {
 155         diag "Test local kernel snapshot with small overwrite buffers"
 156
 157         local event_name="lttng_test_filter_event"
 158
 159         modprobe lttng-test
 160         create_lttng_session_no_output $SESSION_NAME
 161         enable_lttng_mmap_overwrite_small_kernel_channel $SESSION_NAME \
 162                         $CHANNEL_NAME
 163         enable_kernel_lttng_event_ok $SESSION_NAME $event_name $CHANNEL_NAME
 164         start_lttng_tracing_ok $SESSION_NAME
 165         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 166
 167         generate_filter_events_cpu0 10000
 168
 169         # Take first snapshot, remember first line.
 170         lttng_snapshot_record $SESSION_NAME
 171         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 172         diag "First line (1st snapshot): $FIRST_LINE"
 173
 174         rm -rf $TRACE_PATH
 175
 176         # Fill CPU 0's buffer and overwrite previous contents
 177         generate_filter_events_cpu0 10000
 178
 179         # Take 2nd snapshot, compare first line. In overwrite mode, they
 180         # WILL be different.
 181         lttng_snapshot_record $SESSION_NAME
 182         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 183         diag "First line (2nd snapshot): $FIRST_LINE_2"
 184         rm -rf $TRACE_PATH
 185
 186         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 187                 pass "First snapshot event do not match"
 188         else
 189                 fail "First snapshot event match"
 190         fi
 191
 192         stop_lttng_tracing_ok $SESSION_NAME
 193         destroy_lttng_session_ok $SESSION_NAME
 194         modprobe --remove lttng-test
 195 }
 196
 197 function test_kernel_1000_local_snapshots ()
 198 {
 199         NB_SNAP=1000
 200
 201         diag "Test local kernel snapshots"
 202         create_lttng_session_no_output $SESSION_NAME
 203         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
 204         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
 205         start_lttng_tracing_ok $SESSION_NAME
 206         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 207         for i in $(seq 1 $NB_SNAP); do
 208                 diag "Snapshot $i/$NB_SNAP"
 209                 rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
 210                 lttng_snapshot_record $SESSION_NAME
 211                 # Validate test
 212                 validate_trace $EVENT_NAME $TRACE_PATH/
 213                 if [ $? -eq 0 ]; then
 214                         # Only delete if successful
 215                         rm -rf $TRACE_PATH
 216                 else
 217                         break
 218                 fi
 219         done
 220         stop_lttng_tracing_ok $SESSION_NAME
 221         destroy_lttng_session_ok $SESSION_NAME
 222 }
 223
 224 plan_tests $NUM_TESTS
 225
 226 print_test_banner "$TEST_DESC"
 227
 228 bail_out_if_no_babeltrace
 229
 230
 231 if [ "$(id -u)" == "0" ]; then
 232         isroot=1
 233 else
 234         isroot=0
 235 fi
 236
 237 skip $isroot "Root access is needed. Skipping all kernel snapshot tests" $NUM_TESTS ||
 238 {
 239
 240         validate_lttng_modules_present
 241
 242         start_lttng_sessiond
 243
 244         #tests=( test_kernel_1000_local_snapshots )
 245         tests=( test_kernel_local_snapshot
 246                 test_kernel_local_snapshot_after_stop
 247                 test_kernel_local_snapshot_append_to_metadata
 248                 test_kernel_local_snapshot_discard
 249                 test_kernel_local_snapshot_overwrite_small_buffers
 250                 test_kernel_1000_local_snapshots
 251         )
 252
 253         for fct_test in ${tests[@]};
 254         do
 255                 SESSION_NAME=$(randstring 16 0)
 256                 ${fct_test}
 257
 258         done
 259
 260         stop_lttng_sessiond
 261 }