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)
  16
  17 NUM_TESTS=2060
  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 $EVENT_NAME $TRACE_PATH/
  35         if [ $? -eq 0 ]; then
  36                 # Only delete if successful
  37                 rm -rf $TRACE_PATH
  38         else
  39                 break
  40         fi
  41 }
  42
  43 function test_kernel_local_snapshot_after_stop ()
  44 {
  45         diag "Test local kernel snapshots after stop"
  46         create_lttng_session_no_output $SESSION_NAME
  47         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  48         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
  49         start_lttng_tracing_ok $SESSION_NAME
  50         stop_lttng_tracing_ok $SESSION_NAME
  51         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
  52         lttng_snapshot_record $SESSION_NAME
  53         destroy_lttng_session_ok $SESSION_NAME
  54
  55         # Validate test
  56         validate_trace $EVENT_NAME $TRACE_PATH/
  57         if [ $? -eq 0 ]; then
  58                 # Only delete if successful
  59                 rm -rf $TRACE_PATH
  60         else
  61                 break
  62         fi
  63 }
  64
  65 function test_kernel_local_snapshot_append_to_metadata ()
  66 {
  67         local EVENT1=sched_switch
  68         local EVENT2=sched_process_exit
  69
  70         diag "Test local kernel snapshots with one event $EVENT1"
  71         create_lttng_session_no_output $SESSION_NAME
  72         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  73         lttng_enable_kernel_event $SESSION_NAME $EVENT1 $CHANNEL_NAME
  74         start_lttng_tracing_ok $SESSION_NAME
  75         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
  76
  77         # first snapshot with only 1 event
  78         lttng_snapshot_record $SESSION_NAME
  79         validate_trace $EVENT_NAME $TRACE_PATH/
  80         if [ $? -eq 0 ]; then
  81                 # Only delete if successful
  82                 rm -rf $TRACE_PATH
  83         else
  84                 break
  85         fi
  86
  87         diag "Adding event $EVENT2"
  88         # second snapshot with 2 events
  89         lttng_enable_kernel_event $SESSION_NAME $EVENT2 $CHANNEL_NAME
  90         rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
  91         lttng_snapshot_record $SESSION_NAME
  92         validate_trace "${EVENT1},${EVENT2}" $TRACE_PATH/
  93         if [ $? -eq 0 ]; then
  94                 # Only delete if successful
  95                 rm -rf $TRACE_PATH
  96         else
  97                 break
  98         fi
  99
 100         stop_lttng_tracing_ok $SESSION_NAME
 101         destroy_lttng_session_ok $SESSION_NAME
 102 }
 103
 104 function true_loop_cpu0()
 105 {
 106         # Generate many system call events (fill buffers) on CPU 0
 107         for a in $(seq 1 $1); do
 108                 taskset 0x00000001 /bin/true;
 109         done
 110 }
 111
 112 function test_kernel_local_snapshot_discard ()
 113 {
 114         diag "Test local kernel snapshots with small discard buffers"
 115         create_lttng_session_no_output $SESSION_NAME
 116         enable_lttng_mmap_discard_small_kernel_channel $SESSION_NAME \
 117                         $CHANNEL_NAME
 118         lttng_enable_kernel_syscall_ok $SESSION_NAME -a $CHANNEL_NAME
 119         start_lttng_tracing_ok $SESSION_NAME
 120         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 121
 122         true_loop_cpu0 10000
 123
 124         # Take first snapshot, remember first line.
 125         lttng_snapshot_record $SESSION_NAME
 126         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 127         diag "First line (1st snapshot): $FIRST_LINE"
 128
 129         rm -rf $TRACE_PATH
 130
 131         true_loop_cpu0 10000
 132
 133         # Take 2nd snapshot, compare first line. In discard mode, they
 134         # should still be the same.
 135         lttng_snapshot_record $SESSION_NAME
 136         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 137         diag "First line (2nd snapshot): $FIRST_LINE"
 138         rm -rf $TRACE_PATH
 139
 140         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 141                 fail "First snapshot event do not match"
 142         else
 143                 pass "First snapshot event match"
 144         fi
 145
 146         stop_lttng_tracing_ok $SESSION_NAME
 147         destroy_lttng_session_ok $SESSION_NAME
 148 }
 149
 150 function test_kernel_local_snapshot_overwrite_small_buffers ()
 151 {
 152         diag "Test local kernel snapshot with small overwrite buffers"
 153         create_lttng_session_no_output $SESSION_NAME
 154         enable_lttng_mmap_overwrite_small_kernel_channel $SESSION_NAME \
 155                         $CHANNEL_NAME
 156         lttng_enable_kernel_syscall_ok $SESSION_NAME -a $CHANNEL_NAME
 157         start_lttng_tracing_ok $SESSION_NAME
 158         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 159
 160         true_loop_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         true_loop_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 }
 187
 188 function test_kernel_1000_local_snapshots ()
 189 {
 190         NB_SNAP=1000
 191
 192         diag "Test local kernel snapshots"
 193         create_lttng_session_no_output $SESSION_NAME
 194         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
 195         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
 196         start_lttng_tracing_ok $SESSION_NAME
 197         lttng_snapshot_add_output_ok $SESSION_NAME file://$TRACE_PATH
 198         for i in $(seq 1 $NB_SNAP); do
 199                 diag "Snapshot $i/$NB_SNAP"
 200                 rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
 201                 lttng_snapshot_record $SESSION_NAME
 202                 # Validate test
 203                 validate_trace $EVENT_NAME $TRACE_PATH/
 204                 if [ $? -eq 0 ]; then
 205                         # Only delete if successful
 206                         rm -rf $TRACE_PATH
 207                 else
 208                         break
 209                 fi
 210         done
 211         stop_lttng_tracing_ok $SESSION_NAME
 212         destroy_lttng_session_ok $SESSION_NAME
 213 }
 214
 215 plan_tests $NUM_TESTS
 216
 217 print_test_banner "$TEST_DESC"
 218
 219 if [ "$(id -u)" == "0" ]; then
 220         isroot=1
 221 else
 222         isroot=0
 223 fi
 224
 225 skip $isroot "Root access is needed. Skipping all kernel snapshot tests" $NUM_TESTS ||
 226 {
 227
 228         validate_lttng_modules_present
 229
 230         start_lttng_sessiond
 231
 232         #tests=( test_kernel_1000_local_snapshots )
 233         tests=( test_kernel_local_snapshot
 234                 test_kernel_local_snapshot_after_stop
 235                 test_kernel_local_snapshot_append_to_metadata
 236                 test_kernel_local_snapshot_discard
 237                 test_kernel_local_snapshot_overwrite_small_buffers
 238                 test_kernel_1000_local_snapshots
 239         )
 240
 241         for fct_test in ${tests[@]};
 242         do
 243                 SESSION_NAME=$(randstring 16 0)
 244                 ${fct_test}
 245
 246         done
 247
 248         stop_lttng_sessiond
 249 }