| 1 | # Copyright 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 2 | # |
| 3 | # This program is free software; you can redistribute it and/or modify |
| 4 | # it under the terms of the GNU General Public License as published by |
| 5 | # the Free Software Foundation; either version 2 of the License, or |
| 6 | # (at your option) any later version. |
| 7 | # |
| 8 | # This program is distributed in the hope that it will be useful, |
| 9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | # GNU General Public License for more details. |
| 12 | # |
| 13 | # You should have received a copy of the GNU General Public License along |
| 14 | # with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | |
| 17 | # This script will enable the system-wide tap on the given list of events passed |
| 18 | # as parameter, and stop the tap at each other "normal rate" events. |
| 19 | |
| 20 | #excluding core markers (already connected) |
| 21 | #excluding locking markers (high traffic) |
| 22 | |
| 23 | echo Connecting function markers |
| 24 | |
| 25 | # interesting period starts with the list of events passed as parameter. |
| 26 | START_FTRACE=$* |
| 27 | |
| 28 | # interesting period may stop with one specific event, but also try to keep the |
| 29 | # other START_FTRACE events triggers to the lowest possible overhead by stopping |
| 30 | # function trace at every other events. |
| 31 | # Do _not_ disable function tracing in ftrace_entry event unless you really only |
| 32 | # want the first function entry... |
| 33 | 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_` |
| 34 | |
| 35 | for a in $START_FTRACE; do |
| 36 | STOP_FTRACE=`echo $STOP_FTRACE|sed 's/$a//'` |
| 37 | done |
| 38 | |
| 39 | |
| 40 | for a in $STOP_FTRACE; do |
| 41 | echo Connecting stop $a |
| 42 | echo "connect $a ftrace_system_stop" > /proc/ltt |
| 43 | done |
| 44 | |
| 45 | for a in $START_FTRACE; do |
| 46 | echo Connecting start $a |
| 47 | echo "connect $a ftrace_system_start" > /proc/ltt |
| 48 | done |
| 49 | |
| 50 | |