lttng-analyses-record

   1 #!/bin/bash
   2
   3 # Helper to setup a local LTTng tracing session with the appropriate
   4 # settings for the lttng analyses scripts
   5
   6 SESSION_NAME="lttng-analysis-$RANDOM"
   7
   8 destroy()
   9 {
  10         lttng destroy $SESSION_NAME >/dev/null
  11         echo ""
  12         echo "You can now launch the analyses scripts on /$TRACEPATH"
  13         exit 0
  14 }
  15
  16 if test "$1" = "-h" -o "$1" = "--help"; then
  17         echo "usage : $0"
  18         exit 0
  19 fi
  20
  21 pgrep -u root lttng-sessiond >/dev/null
  22 if test $? != 0; then
  23         echo "Starting lttng-sessiond as root (trying sudo, start manually if \
  24 it fails)"
  25         sudo lttng-sessiond -d
  26         if test $? != 0; then
  27                 exit 1
  28         fi
  29 fi
  30
  31 SUDO=""
  32 groups|grep tracing >/dev/null
  33 if test $? != 0; then
  34         echo "You are not a member of the tracing group, so you need root \
  35 access, the script will try with sudo"
  36         SUDO="sudo"
  37 fi
  38
  39 # check if lttng command if in the path
  40 # check if the user can execute the command (with sudo if not in tracing group)
  41 # check if lttng-modules is installed
  42 $SUDO lttng list -k | grep sched_switch >/dev/null
  43 if test $? != 0; then
  44         echo "Something went wrong executing \"$SUDO lttng list -k | grep sched_switch\", \
  45 try to fix the problem manually and then start the script again"
  46 fi
  47
  48 # if our random session name was already in use, add more randomness...
  49 $SUDO lttng list | grep $SESSION_NAME
  50 if test $? = 0; then
  51         SESSION_NAME="$SESSION_NAME-$RANDOM"
  52 fi
  53 $SUDO lttng list | grep $SESSION_NAME
  54 if test $? = 0; then
  55         echo "Cannot create a random session name, something must be wrong"
  56         exit 2
  57 fi
  58
  59 lttng create $SESSION_NAME >/tmp/lttngout
  60 [[ $? != 0 ]] && exit 2
  61 TRACEPATH=$(grep Traces /tmp/lttngout | cut -d'/' -f2-)
  62 rm /tmp/lttngout
  63
  64 trap "destroy" SIGINT SIGTERM
  65
  66 lttng enable-channel -k chan1 --subbuf-size=8M >/dev/null
  67 lttng enable-event -s $SESSION_NAME -k sched_switch,block_rq_complete,block_rq_issue,block_bio_remap,block_bio_backmerge,netif_receive_skb,net_dev_xmit,sched_process_fork,sched_process_exec,lttng_statedump_process_state,lttng_statedump_file_descriptor,lttng_statedump_block_device,writeback_pages_written,mm_vmscan_wakeup_kswapd,mm_page_free,mm_page_alloc,block_dirty_buffer,irq_handler_entry,irq_handler_exit,softirq_entry,softirq_exit,softirq_raise -c chan1 >/dev/null
  68 [[ $? != 0 ]] && exit 2
  69 lttng enable-event -s $SESSION_NAME -k -c chan1 --syscall -a >/dev/null
  70 [[ $? != 0 ]] && exit 2
  71 # if you want to add Perf counters, do something like that :
  72 #lttng add-context -s $SESSION_NAME -k -t perf:cache-misses -t perf:major-faults -t perf:branch-load-misses >/dev/null
  73
  74 lttng start $SESSION_NAME >/dev/null
  75 [[ $? != 0 ]] && exit 2
  76
  77 echo -n "The trace is now recording, press ctrl+c to stop it "
  78
  79 while true; do
  80         echo -n "."
  81         sleep 1
  82 done
  83
  84 destroy