| 1 | # This script will disable the system-wide tap on the given list of events |
| 2 | # passed 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 Disconnecting 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 | for a in $START_FTRACE; do |
| 24 | echo Disconnecting start $a |
| 25 | echo "disconnect $a ftrace_system_start" > /proc/ltt |
| 26 | done |
| 27 | |
| 28 | for a in $STOP_FTRACE; do |
| 29 | echo Disconnecting stop $a |
| 30 | echo "disconnect $a ftrace_system_stop" > /proc/ltt |
| 31 | done |
| 32 | |
| 33 | |