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 -d -t 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 $SESSION_NAME
  95 }
  96
  97 function generate_filter_events_cpu0()
  98 {
  99         # Generate many events (fill buffers) on a single CPU
 100         taskset --cpu-list "$(get_any_available_cpu)" /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         # Fill CPU 0's buffer and overwrite previous contents
 127         generate_filter_events_cpu0 10000
 128
 129         # Take 2nd snapshot, compare first line. In discard mode, they
 130         # should still be the same.
 131         lttng_snapshot_record $SESSION_NAME
 132         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 133         diag "First line (2nd snapshot): $FIRST_LINE"
 134         rm -rf $TRACE_PATH
 135
 136         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 137                 fail "First snapshot event do not match"
 138         else
 139                 pass "First snapshot event match"
 140         fi
 141
 142         stop_lttng_tracing_ok $SESSION_NAME
 143         destroy_lttng_session_ok $SESSION_NAME
 144         modprobe --remove lttng-test
 145 }
 146
 147 function test_kernel_local_snapshot_overwrite_small_buffers ()
 148 {
 149         diag "Test local kernel snapshot with small overwrite buffers"
 150
 151         local event_name="lttng_test_filter_event"
 152
 153         modprobe lttng-test
 154         create_lttng_session_no_output $SESSION_NAME
 155         enable_lttng_mmap_overwrite_small_kernel_channel $SESSION_NAME \
 156                         $CHANNEL_NAME
 157         enable_kernel_lttng_event_ok $SESSION_NAME $event_name $CHANNEL_NAME
 158         start_lttng_tracing_ok $SESSION_NAME
 159         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 160
 161         generate_filter_events_cpu0 10000
 162
 163         # Take first snapshot, remember first line.
 164         lttng_snapshot_record $SESSION_NAME
 165         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 166         diag "First line (1st snapshot): $FIRST_LINE"
 167
 168         rm -rf $TRACE_PATH
 169
 170         # Fill CPU 0's buffer and overwrite previous contents
 171         generate_filter_events_cpu0 10000
 172
 173         # Take 2nd snapshot, compare first line. In overwrite mode, they
 174         # WILL be different.
 175         lttng_snapshot_record $SESSION_NAME
 176         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 177         diag "First line (2nd snapshot): $FIRST_LINE_2"
 178         rm -rf $TRACE_PATH
 179
 180         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 181                 pass "First snapshot event do not match"
 182         else
 183                 fail "First snapshot event match"
 184         fi
 185
 186         stop_lttng_tracing_ok $SESSION_NAME
 187         destroy_lttng_session_ok $SESSION_NAME
 188         modprobe --remove lttng-test
 189 }
 190
 191 function test_kernel_1000_local_snapshots ()
 192 {
 193         NB_SNAP=1000
 194
 195         diag "Test local kernel snapshots"
 196         create_lttng_session_no_output $SESSION_NAME
 197         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
 198         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
 199         start_lttng_tracing_ok $SESSION_NAME
 200         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 201         for i in $(seq 1 $NB_SNAP); do
 202                 diag "Snapshot $i/$NB_SNAP"
 203                 rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
 204                 lttng_snapshot_record $SESSION_NAME
 205                 # Validate test
 206                 validate_trace $EVENT_NAME $TRACE_PATH/
 207                 if [ $? -eq 0 ]; then
 208                         # Only delete if successful
 209                         rm -rf $TRACE_PATH
 210                 else
 211                         break
 212                 fi
 213         done
 214         stop_lttng_tracing_ok $SESSION_NAME
 215         destroy_lttng_session_ok $SESSION_NAME
 216 }
 217
 218 plan_tests $NUM_TESTS
 219
 220 print_test_banner "$TEST_DESC"
 221
 222 bail_out_if_no_babeltrace
 223
 224 check_skip_kernel_test "$NUM_TESTS" "Skipping all tests." ||
 225 {
 226
 227         validate_lttng_modules_present
 228
 229         start_lttng_sessiond
 230
 231         #tests=( test_kernel_1000_local_snapshots )
 232         tests=( test_kernel_local_snapshot
 233                 test_kernel_local_snapshot_after_stop
 234                 test_kernel_local_snapshot_append_to_metadata
 235                 test_kernel_local_snapshot_discard
 236                 test_kernel_local_snapshot_overwrite_small_buffers
 237                 test_kernel_1000_local_snapshots
 238         )
 239
 240         for fct_test in ${tests[@]};
 241         do
 242                 SESSION_NAME=$(randstring 16 0)
 243                 ${fct_test}
 244
 245         done
 246
 247         stop_lttng_sessiond
 248 }