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         fi
  60 }
  61
  62 function test_kernel_local_snapshot_append_to_metadata ()
  63 {
  64         local EVENT1=sched_switch
  65         local EVENT2=sched_process_exit
  66
  67         diag "Test local kernel snapshots with one event $EVENT1"
  68         create_lttng_session_no_output $SESSION_NAME
  69         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  70         lttng_enable_kernel_event $SESSION_NAME $EVENT1 $CHANNEL_NAME
  71         start_lttng_tracing_ok $SESSION_NAME
  72         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
  73
  74         # first snapshot with only 1 event
  75         lttng_snapshot_record $SESSION_NAME
  76         validate_trace $EVENT_NAME $TRACE_PATH/
  77         if [ $? -eq 0 ]; then
  78                 # Only delete if successful
  79                 rm -rf $TRACE_PATH
  80         fi
  81
  82         diag "Adding event $EVENT2"
  83         # second snapshot with 2 events
  84         lttng_enable_kernel_event $SESSION_NAME $EVENT2 $CHANNEL_NAME
  85         rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
  86         lttng_snapshot_record $SESSION_NAME
  87         validate_trace "${EVENT1},${EVENT2}" $TRACE_PATH/
  88         if [ $? -eq 0 ]; then
  89                 # Only delete if successful
  90                 rm -rf $TRACE_PATH
  91         fi
  92
  93         stop_lttng_tracing_ok $SESSION_NAME
  94         destroy_lttng_session_ok $SESSION_NAME
  95 }
  96
  97 function generate_filter_events_cpu0()
  98 {
  99         # Generate many events (fill buffers) on CPU 0
 100         taskset 0x00000001 /bin/echo -n "$1" > /proc/lttng-test-filter-event 2> /dev/null
 101 }
 102
 103 function test_kernel_local_snapshot_discard ()
 104 {
 105         diag "Test local kernel snapshots with small discard buffers"
 106
 107         local event_name="lttng_test_filter_event"
 108
 109         modprobe lttng-test
 110         create_lttng_session_no_output $SESSION_NAME
 111         enable_lttng_mmap_discard_small_kernel_channel $SESSION_NAME \
 112                         $CHANNEL_NAME
 113         enable_kernel_lttng_event_ok $SESSION_NAME $event_name $CHANNEL_NAME
 114         start_lttng_tracing_ok $SESSION_NAME
 115         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 116
 117         generate_filter_events_cpu0 10000
 118
 119         # Take first snapshot, remember first line.
 120         lttng_snapshot_record $SESSION_NAME
 121         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 122         diag "First line (1st snapshot): $FIRST_LINE"
 123
 124         rm -rf $TRACE_PATH
 125
 126         generate_filter_events_cpu0 10000
 127
 128         # Take 2nd snapshot, compare first line. In discard mode, they
 129         # should still be the same.
 130         lttng_snapshot_record $SESSION_NAME
 131         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 132         diag "First line (2nd snapshot): $FIRST_LINE"
 133         rm -rf $TRACE_PATH
 134
 135         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 136                 fail "First snapshot event do not match"
 137         else
 138                 pass "First snapshot event match"
 139         fi
 140
 141         stop_lttng_tracing_ok $SESSION_NAME
 142         destroy_lttng_session_ok $SESSION_NAME
 143         modprobe --remove lttng-test
 144 }
 145
 146 function test_kernel_local_snapshot_overwrite_small_buffers ()
 147 {
 148         diag "Test local kernel snapshot with small overwrite buffers"
 149
 150         local event_name="lttng_test_filter_event"
 151
 152         modprobe lttng-test
 153         create_lttng_session_no_output $SESSION_NAME
 154         enable_lttng_mmap_overwrite_small_kernel_channel $SESSION_NAME \
 155                         $CHANNEL_NAME
 156         enable_kernel_lttng_event_ok $SESSION_NAME $event_name $CHANNEL_NAME
 157         start_lttng_tracing_ok $SESSION_NAME
 158         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 159
 160         generate_filter_events_cpu0 10000
 161
 162         # Take first snapshot, remember first line.
 163         lttng_snapshot_record $SESSION_NAME
 164         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 165         diag "First line (1st snapshot): $FIRST_LINE"
 166
 167         rm -rf $TRACE_PATH
 168
 169         generate_filter_events_cpu0 10000
 170
 171         # Take 2nd snapshot, compare first line. In overwrite mode, they
 172         # WILL be different.
 173         lttng_snapshot_record $SESSION_NAME
 174         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 175         diag "First line (2nd snapshot): $FIRST_LINE_2"
 176         rm -rf $TRACE_PATH
 177
 178         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 179                 pass "First snapshot event do not match"
 180         else
 181                 fail "First snapshot event match"
 182         fi
 183
 184         stop_lttng_tracing_ok $SESSION_NAME
 185         destroy_lttng_session_ok $SESSION_NAME
 186         modprobe --remove lttng-test
 187 }
 188
 189 function test_kernel_1000_local_snapshots ()
 190 {
 191         NB_SNAP=1000
 192
 193         diag "Test local kernel snapshots"
 194         create_lttng_session_no_output $SESSION_NAME
 195         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
 196         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
 197         start_lttng_tracing_ok $SESSION_NAME
 198         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 199         for i in $(seq 1 $NB_SNAP); do
 200                 diag "Snapshot $i/$NB_SNAP"
 201                 rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
 202                 lttng_snapshot_record $SESSION_NAME
 203                 # Validate test
 204                 validate_trace $EVENT_NAME $TRACE_PATH/
 205                 if [ $? -eq 0 ]; then
 206                         # Only delete if successful
 207                         rm -rf $TRACE_PATH
 208                 else
 209                         break
 210                 fi
 211         done
 212         stop_lttng_tracing_ok $SESSION_NAME
 213         destroy_lttng_session_ok $SESSION_NAME
 214 }
 215
 216 plan_tests $NUM_TESTS
 217
 218 print_test_banner "$TEST_DESC"
 219
 220 if [ "$(id -u)" == "0" ]; then
 221         isroot=1
 222 else
 223         isroot=0
 224 fi
 225
 226 skip $isroot "Root access is needed. Skipping all kernel snapshot tests" $NUM_TESTS ||
 227 {
 228
 229         validate_lttng_modules_present
 230
 231         start_lttng_sessiond
 232
 233         #tests=( test_kernel_1000_local_snapshots )
 234         tests=( test_kernel_local_snapshot
 235                 test_kernel_local_snapshot_after_stop
 236                 test_kernel_local_snapshot_append_to_metadata
 237                 test_kernel_local_snapshot_discard
 238                 test_kernel_local_snapshot_overwrite_small_buffers
 239                 test_kernel_1000_local_snapshots
 240         )
 241
 242         for fct_test in ${tests[@]};
 243         do
 244                 SESSION_NAME=$(randstring 16 0)
 245                 ${fct_test}
 246
 247         done
 248
 249         stop_lttng_sessiond
 250 }