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         generate_filter_events_cpu0 10000
 133
 134         # Take 2nd snapshot, compare first line. In discard mode, they
 135         # should still be the same.
 136         lttng_snapshot_record $SESSION_NAME
 137         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 138         diag "First line (2nd snapshot): $FIRST_LINE"
 139         rm -rf $TRACE_PATH
 140
 141         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 142                 fail "First snapshot event do not match"
 143         else
 144                 pass "First snapshot event match"
 145         fi
 146
 147         stop_lttng_tracing_ok $SESSION_NAME
 148         destroy_lttng_session_ok $SESSION_NAME
 149         modprobe --remove lttng-test
 150 }
 151
 152 function test_kernel_local_snapshot_overwrite_small_buffers ()
 153 {
 154         diag "Test local kernel snapshot with small overwrite buffers"
 155
 156         local event_name="lttng_test_filter_event"
 157
 158         modprobe lttng-test
 159         create_lttng_session_no_output $SESSION_NAME
 160         enable_lttng_mmap_overwrite_small_kernel_channel $SESSION_NAME \
 161                         $CHANNEL_NAME
 162         enable_kernel_lttng_event_ok $SESSION_NAME $event_name $CHANNEL_NAME
 163         start_lttng_tracing_ok $SESSION_NAME
 164         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 165
 166         generate_filter_events_cpu0 10000
 167
 168         # Take first snapshot, remember first line.
 169         lttng_snapshot_record $SESSION_NAME
 170         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 171         diag "First line (1st snapshot): $FIRST_LINE"
 172
 173         rm -rf $TRACE_PATH
 174
 175         generate_filter_events_cpu0 10000
 176
 177         # Take 2nd snapshot, compare first line. In overwrite mode, they
 178         # WILL be different.
 179         lttng_snapshot_record $SESSION_NAME
 180         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 181         diag "First line (2nd snapshot): $FIRST_LINE_2"
 182         rm -rf $TRACE_PATH
 183
 184         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 185                 pass "First snapshot event do not match"
 186         else
 187                 fail "First snapshot event match"
 188         fi
 189
 190         stop_lttng_tracing_ok $SESSION_NAME
 191         destroy_lttng_session_ok $SESSION_NAME
 192         modprobe --remove lttng-test
 193 }
 194
 195 function test_kernel_1000_local_snapshots ()
 196 {
 197         NB_SNAP=1000
 198
 199         diag "Test local kernel snapshots"
 200         create_lttng_session_no_output $SESSION_NAME
 201         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
 202         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
 203         start_lttng_tracing_ok $SESSION_NAME
 204         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 205         for i in $(seq 1 $NB_SNAP); do
 206                 diag "Snapshot $i/$NB_SNAP"
 207                 rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
 208                 lttng_snapshot_record $SESSION_NAME
 209                 # Validate test
 210                 validate_trace $EVENT_NAME $TRACE_PATH/
 211                 if [ $? -eq 0 ]; then
 212                         # Only delete if successful
 213                         rm -rf $TRACE_PATH
 214                 else
 215                         break
 216                 fi
 217         done
 218         stop_lttng_tracing_ok $SESSION_NAME
 219         destroy_lttng_session_ok $SESSION_NAME
 220 }
 221
 222 plan_tests $NUM_TESTS
 223
 224 print_test_banner "$TEST_DESC"
 225
 226 bail_out_if_no_babeltrace
 227
 228
 229 if [ "$(id -u)" == "0" ]; then
 230         isroot=1
 231 else
 232         isroot=0
 233 fi
 234
 235 skip $isroot "Root access is needed. Skipping all kernel snapshot tests" $NUM_TESTS ||
 236 {
 237
 238         validate_lttng_modules_present
 239
 240         start_lttng_sessiond
 241
 242         #tests=( test_kernel_1000_local_snapshots )
 243         tests=( test_kernel_local_snapshot
 244                 test_kernel_local_snapshot_after_stop
 245                 test_kernel_local_snapshot_append_to_metadata
 246                 test_kernel_local_snapshot_discard
 247                 test_kernel_local_snapshot_overwrite_small_buffers
 248                 test_kernel_1000_local_snapshots
 249         )
 250
 251         for fct_test in ${tests[@]};
 252         do
 253                 SESSION_NAME=$(randstring 16 0)
 254                 ${fct_test}
 255
 256         done
 257
 258         stop_lttng_sessiond
 259 }