tests/regression/tools/snapshots/test_kernel

   1 #!/bin/bash
   2 #
   3 # Copyright (C) - 2013 Julien Desfossez <jdesfossez@efficios.com>
   4 #
   5 # This library is free software; you can redistribute it and/or modify it under
   6 # the terms of the GNU Lesser General Public License as published by the Free
   7 # Software Foundation; version 2.1 of the License.
   8 #
   9 # This library is distributed in the hope that it will be useful, but WITHOUT
  10 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  11 # FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
  12 # details.
  13 #
  14 # You should have received a copy of the GNU Lesser General Public License
  15 # along with this library; if not, write to the Free Software Foundation, Inc.,
  16 # 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  17 TEST_DESC="Snapshots - Kernel tracing"
  18
  19 CURDIR=$(dirname $0)/
  20 TESTDIR=$CURDIR/../../..
  21 EVENT_NAME="sched_switch"
  22 PID_RELAYD=0
  23 SESSION_NAME=""
  24 CHANNEL_NAME="snapchan"
  25
  26 TRACE_PATH=$(mktemp -d)
  27
  28 NUM_TESTS=2060
  29
  30 source $TESTDIR/utils/utils.sh
  31
  32 # LTTng kernel modules check
  33 out=`ls /lib/modules/$(uname -r)/extra | grep lttng`
  34 if [ -z "$out" ]; then
  35         BAIL_OUT "LTTng modules not detected."
  36 fi
  37
  38 function test_kernel_local_snapshot ()
  39 {
  40         diag "Test local kernel snapshots"
  41         create_lttng_session_no_output $SESSION_NAME
  42         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  43         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
  44         start_lttng_tracing_ok $SESSION_NAME
  45         lttng_snapshot_add_output_ok $SESSION_NAME $TRACE_PATH
  46         lttng_snapshot_record $SESSION_NAME
  47         stop_lttng_tracing_ok $SESSION_NAME
  48         destroy_lttng_session_ok $SESSION_NAME
  49
  50         # Validate test
  51         validate_trace $EVENT_NAME $TRACE_PATH/
  52         if [ $? -eq 0 ]; then
  53                 # Only delete if successful
  54                 rm -rf $TRACE_PATH
  55         else
  56                 break
  57         fi
  58 }
  59
  60 function test_kernel_local_snapshot_after_stop ()
  61 {
  62         diag "Test local kernel snapshots after stop"
  63         create_lttng_session_no_output $SESSION_NAME
  64         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  65         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
  66         start_lttng_tracing_ok $SESSION_NAME
  67         stop_lttng_tracing_ok $SESSION_NAME
  68         lttng_snapshot_add_output_ok $SESSION_NAME $TRACE_PATH
  69         lttng_snapshot_record $SESSION_NAME
  70         destroy_lttng_session_ok $SESSION_NAME
  71
  72         # Validate test
  73         validate_trace $EVENT_NAME $TRACE_PATH/
  74         if [ $? -eq 0 ]; then
  75                 # Only delete if successful
  76                 rm -rf $TRACE_PATH
  77         else
  78                 break
  79         fi
  80 }
  81
  82 function test_kernel_local_snapshot_append_to_metadata ()
  83 {
  84         local EVENT1=sched_switch
  85         local EVENT2=sched_process_exit
  86
  87         diag "Test local kernel snapshots with one event $EVENT1"
  88         create_lttng_session_no_output $SESSION_NAME
  89         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
  90         lttng_enable_kernel_event $SESSION_NAME $EVENT1 $CHANNEL_NAME
  91         start_lttng_tracing_ok $SESSION_NAME
  92         lttng_snapshot_add_output_ok $SESSION_NAME $TRACE_PATH
  93
  94         # first snapshot with only 1 event
  95         lttng_snapshot_record $SESSION_NAME
  96         validate_trace $EVENT_NAME $TRACE_PATH/
  97         if [ $? -eq 0 ]; then
  98                 # Only delete if successful
  99                 rm -rf $TRACE_PATH
 100         else
 101                 break
 102         fi
 103
 104         diag "Adding event $EVENT2"
 105         # second snapshot with 2 events
 106         lttng_enable_kernel_event $SESSION_NAME $EVENT2 $CHANNEL_NAME
 107         rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
 108         lttng_snapshot_record $SESSION_NAME
 109         validate_trace "${EVENT1},${EVENT2}" $TRACE_PATH/
 110         if [ $? -eq 0 ]; then
 111                 # Only delete if successful
 112                 rm -rf $TRACE_PATH
 113         else
 114                 break
 115         fi
 116
 117         stop_lttng_tracing_ok $SESSION_NAME
 118         destroy_lttng_session_ok $SESSION_NAME
 119 }
 120
 121 function true_loop_cpu0()
 122 {
 123         # Generate many system call events (fill buffers) on CPU 0
 124         for a in $(seq 1 $1); do
 125                 taskset 0x00000001 /bin/true;
 126         done
 127 }
 128
 129 function test_kernel_local_snapshot_discard ()
 130 {
 131         diag "Test local kernel snapshots with small discard buffers"
 132         create_lttng_session_no_output $SESSION_NAME
 133         enable_lttng_mmap_discard_small_kernel_channel $SESSION_NAME \
 134                         $CHANNEL_NAME
 135         lttng_enable_kernel_syscall_ok $SESSION_NAME -a $CHANNEL_NAME
 136         start_lttng_tracing_ok $SESSION_NAME
 137         lttng_snapshot_add_output_ok $SESSION_NAME $TRACE_PATH
 138
 139         true_loop_cpu0 10000
 140
 141         # Take first snapshot, remember first line.
 142         lttng_snapshot_record $SESSION_NAME
 143         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 144         diag "First line (1st snapshot): $FIRST_LINE"
 145
 146         rm -rf $TRACE_PATH
 147
 148         true_loop_cpu0 10000
 149
 150         # Take 2nd snapshot, compare first line. In discard mode, they
 151         # should still be the same.
 152         lttng_snapshot_record $SESSION_NAME
 153         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 154         diag "First line (2nd snapshot): $FIRST_LINE"
 155         rm -rf $TRACE_PATH
 156
 157         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 158                 fail "First snapshot event do not match."
 159         else
 160                 pass "First snapshot event match."
 161         fi
 162
 163         stop_lttng_tracing_ok $SESSION_NAME
 164         destroy_lttng_session_ok $SESSION_NAME
 165 }
 166
 167 function test_kernel_local_snapshot_overwrite_small_buffers ()
 168 {
 169         diag "Test local kernel snapshot with small overwrite buffers"
 170         create_lttng_session_no_output $SESSION_NAME
 171         enable_lttng_mmap_overwrite_small_kernel_channel $SESSION_NAME \
 172                         $CHANNEL_NAME
 173         lttng_enable_kernel_syscall_ok $SESSION_NAME -a $CHANNEL_NAME
 174         start_lttng_tracing_ok $SESSION_NAME
 175         lttng_snapshot_add_output_ok $SESSION_NAME $TRACE_PATH
 176
 177         true_loop_cpu0 10000
 178
 179         # Take first snapshot, remember first line.
 180         lttng_snapshot_record $SESSION_NAME
 181         FIRST_LINE="$(trace_first_line $TRACE_PATH/)"
 182         diag "First line (1st snapshot): $FIRST_LINE"
 183
 184         rm -rf $TRACE_PATH
 185
 186         true_loop_cpu0 10000
 187
 188         # Take 2nd snapshot, compare first line. In overwrite mode, they
 189         # WILL be different.
 190         lttng_snapshot_record $SESSION_NAME
 191         FIRST_LINE_2="$(trace_first_line $TRACE_PATH/)"
 192         diag "First line (2nd snapshot): $FIRST_LINE_2"
 193         rm -rf $TRACE_PATH
 194
 195         if [ x"$FIRST_LINE" != x"$FIRST_LINE_2" ]; then
 196                 pass "First snapshot event do not match."
 197         else
 198                 fail "First snapshot event match."
 199         fi
 200
 201         stop_lttng_tracing_ok $SESSION_NAME
 202         destroy_lttng_session_ok $SESSION_NAME
 203 }
 204
 205 function test_kernel_1000_local_snapshots ()
 206 {
 207         NB_SNAP=1000
 208
 209         diag "Test local kernel snapshots"
 210         create_lttng_session_no_output $SESSION_NAME
 211         enable_lttng_mmap_overwrite_kernel_channel $SESSION_NAME $CHANNEL_NAME
 212         lttng_enable_kernel_event $SESSION_NAME $EVENT_NAME $CHANNEL_NAME
 213         start_lttng_tracing_ok $SESSION_NAME
 214         lttng_snapshot_add_output_ok $SESSION_NAME $TRACE_PATH
 215         for i in $(seq 1 $NB_SNAP); do
 216                 diag "Snapshot $i/$NB_SNAP"
 217                 rm -rf $TRACE_PATH/snapshot/* 2>/dev/null
 218                 lttng_snapshot_record $SESSION_NAME
 219                 # Validate test
 220                 validate_trace $EVENT_NAME $TRACE_PATH/
 221                 if [ $? -eq 0 ]; then
 222                         # Only delete if successful
 223                         rm -rf $TRACE_PATH
 224                 else
 225                         break
 226                 fi
 227         done
 228         stop_lttng_tracing_ok $SESSION_NAME
 229         destroy_lttng_session_ok $SESSION_NAME
 230 }
 231
 232 plan_tests $NUM_TESTS
 233
 234 print_test_banner "$TEST_DESC"
 235
 236 if [ "$(id -u)" == "0" ]; then
 237         isroot=1
 238 else
 239         isroot=0
 240 fi
 241
 242 skip $isroot "Root access is needed. Skipping all kernel snapshot tests." $NUM_TESTS ||
 243 {
 244         start_lttng_sessiond
 245
 246         #tests=( test_kernel_1000_local_snapshots )
 247         tests=( test_kernel_local_snapshot
 248                 test_kernel_local_snapshot_after_stop
 249                 test_kernel_local_snapshot_append_to_metadata
 250                 test_kernel_local_snapshot_discard
 251                 test_kernel_local_snapshot_overwrite_small_buffers
 252                 test_kernel_1000_local_snapshots
 253         )
 254
 255         for fct_test in ${tests[@]};
 256         do
 257                 SESSION_NAME=$(randstring 16 0)
 258                 ${fct_test}
 259
 260         done
 261
 262         stop_lttng_sessiond
 263 }