tags/ltt-control-0.51-12082008/lttctl/ltt-armtap.sh

   1 # This script will enable the system-wide tap on the given list of events passed
   2 # as parameter, and stop the tap at each other "normal rate" events.
   3
   4 #excluding core markers (already connected)
   5 #excluding locking markers (high traffic)
   6
   7 echo Connecting function markers
   8
   9 # interesting period starts with the list of events passed as parameter.
  10 START_FTRACE=$*
  11
  12 # interesting period may stop with one specific event, but also try to keep the
  13 # other START_FTRACE events triggers to the lowest possible overhead by stopping
  14 # function trace at every other events.
  15 # Do _not_ disable function tracing in ftrace_entry event unless you really only
  16 # want the first function entry...
  17 STOP_FTRACE=`cat /proc/ltt|grep -v %k|awk '{print $2}'|sort -u|grep -v ^core_|grep -v ^locking_|grep -v ^lockdep|grep -v ftrace_entry|grep -v ^tap_`
  18
  19 for a in $START_FTRACE; do
  20         STOP_FTRACE=`echo $STOP_FTRACE|sed 's/$a//'`
  21 done
  22
  23
  24 for a in $STOP_FTRACE; do
  25         echo Connecting stop $a
  26         echo "connect $a ftrace_system_stop" > /proc/ltt
  27 done
  28
  29 for a in $START_FTRACE; do
  30         echo Connecting start $a
  31         echo "connect $a ftrace_system_start" > /proc/ltt
  32 done
  33
  34