tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: Change the ringbuffer size
   4 # flags: instance
   5
   6 rb_size_test() {
   7 ORIG=`cat buffer_size_kb`
   8
   9 expr $ORIG / 2 > buffer_size_kb
  10
  11 expr $ORIG \* 2 > buffer_size_kb
  12
  13 echo $ORIG > buffer_size_kb
  14 }
  15
  16 rb_size_test
  17
  18 : "If per-cpu buffer is supported, imbalance it"
  19 if [ -d per_cpu/cpu0 ]; then
  20   cd per_cpu/cpu0
  21   rb_size_test
  22 fi