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

   1 #!/bin/sh
   2 # description: Snapshot and tracing setting
   3 # flags: instance
   4
   5 [ ! -f snapshot ] && exit_unsupported
   6
   7 echo "Set tracing off"
   8 echo 0 > tracing_on
   9
  10 echo "Allocate and take a snapshot"
  11 echo 1 > snapshot
  12
  13 # Since trace buffer is empty, snapshot is also empty, but allocated
  14 grep -q "Snapshot is allocated" snapshot
  15
  16 echo "Ensure keep tracing off"
  17 test `cat tracing_on` -eq 0
  18
  19 echo "Set tracing on"
  20 echo 1 > tracing_on
  21
  22 echo "Take a snapshot again"
  23 echo 1 > snapshot
  24
  25 echo "Ensure keep tracing on"
  26 test `cat tracing_on` -eq 1
  27
  28 exit 0