lttctl/ltt-armtap.sh

   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