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 true_loop_cpu0()
 104 {
 105         # Generate many system call events (fill buffers) on CPU 0
 106         for a in $(seq 1 $1); do
 107                 taskset 0x00000001 /bin/true;
 108         done
 109 }
 110
 111 function test_kernel_local_snapshot_discard ()
 112 {
 113         diag "Test local kernel snapshots with small discard buffers"
 114         create_lttng_session_no_output $SESSION_NAME
 115         enable_lttng_mmap_discard_small_kernel_channel $SESSION_NAME \
 116                         $CHANNEL_NAME
 117         lttng_enable_kernel_syscall_ok $SESSION_NAME -a $CHANNEL_NAME
 118         start_lttng_tracing_ok $SESSION_NAME
 119         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 120
 121         true_loop_cpu0 10000
 122
 123         # Take first snapshot, remember first line.
 124         lttng_snapshot_record $SESSION_NAME
 125         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 126         diag "First line (1st snapshot): $FIRST_LINE"
 127
 128         rm -rf $TRACE_PATH
 129
 130         true_loop_cpu0 10000
 131
 132         # Take 2nd snapshot, compare first line. In discard mode, they
 133         # should still be the same.
 134         lttng_snapshot_record $SESSION_NAME
 135         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 136         diag "First line (2nd snapshot): $FIRST_LINE"
 137         rm -rf $TRACE_PATH
 138
 139         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 140                 fail "First snapshot event do not match"
 141         else
 142                 pass "First snapshot event match"
 143         fi
 144
 145         stop_lttng_tracing_ok $SESSION_NAME
 146         destroy_lttng_session_ok $SESSION_NAME
 147 }
 148
 149 function test_kernel_local_snapshot_overwrite_small_buffers ()
 150 {
 151         diag "Test local kernel snapshot with small overwrite buffers"
 152         create_lttng_session_no_output $SESSION_NAME
 153         enable_lttng_mmap_overwrite_small_kernel_channel $SESSION_NAME \
 154                         $CHANNEL_NAME
 155         lttng_enable_kernel_syscall_ok $SESSION_NAME -a $CHANNEL_NAME
 156         start_lttng_tracing_ok $SESSION_NAME
 157         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 158
 159         true_loop_cpu0 10000
 160
 161         # Take first snapshot, remember first line.
 162         lttng_snapshot_record $SESSION_NAME
 163         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 164         diag "First line (1st snapshot): $FIRST_LINE"
 165
 166         rm -rf $TRACE_PATH
 167
 168         true_loop_cpu0 10000
 169
 170         # Take 2nd snapshot, compare first line. In overwrite mode, they
 171         # WILL be different.
 172         lttng_snapshot_record $SESSION_NAME
 173         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 174         diag "First line (2nd snapshot): $FIRST_LINE_2"
 175         rm -rf $TRACE_PATH
 176
 177         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 178                 pass "First snapshot event do not match"
 179         else
 180                 fail "First snapshot event match"
 181         fi
 182
 183         stop_lttng_tracing_ok $SESSION_NAME
 184         destroy_lttng_session_ok $SESSION_NAME
 185 }
 186
 187 function test_kernel_1000_local_snapshots ()
 188 {
 189         NB_SNAP=1000
 190
 191         diag "Test local kernel snapshots"
 192         create_lttng_session_no_output $SESSION_NAME
 193         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
 194         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
 195         start_lttng_tracing_ok $SESSION_NAME
 196         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 197         for i in $(seq 1 $NB_SNAP); do
 198                 diag "Snapshot $i/$NB_SNAP"
 199                 rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
 200                 lttng_snapshot_record $SESSION_NAME
 201                 # Validate test
 202                 validate_trace $EVENT_NAME $TRACE_PATH/
 203                 if [ $? -eq 0 ]; then
 204                         # Only delete if successful
 205                         rm -rf $TRACE_PATH
 206                 else
 207                         break
 208                 fi
 209         done
 210         stop_lttng_tracing_ok $SESSION_NAME
 211         destroy_lttng_session_ok $SESSION_NAME
 212 }
 213
 214 plan_tests $NUM_TESTS
 215
 216 print_test_banner "$TEST_DESC"
 217
 218 if [ "$(id -u)" == "0" ]; then
 219         isroot=1
 220 else
 221         isroot=0
 222 fi
 223
 224 skip $isroot "Root access is needed. Skipping all kernel snapshot tests" $NUM_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 }