tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: Snapshot and tracing_cpumask
   4 # requires: trace_marker tracing_cpumask snapshot
   5 # flags: instance
   6
   7 # This testcase is constrived to reproduce a problem that the cpu buffers
   8 # become unavailable which is due to 'record_disabled' of array_buffer and
   9 # max_buffer being messed up.
  10
  11 # Store origin cpumask
  12 ORIG_CPUMASK=`cat tracing_cpumask`
  13
  14 # Stop tracing all cpu
  15 echo 0 > tracing_cpumask
  16
  17 # Take a snapshot of the main buffer
  18 echo 1 > snapshot
  19
  20 # Restore origin cpumask, note that there should be some cpus being traced
  21 echo ${ORIG_CPUMASK} > tracing_cpumask
  22
  23 # Set tracing on
  24 echo 1 > tracing_on
  25
  26 # Write a log into buffer
  27 echo "test input 1" > trace_marker
  28
  29 # Ensure the log writed so that cpu buffers are still available
  30 grep -q "test input 1" trace
  31 exit 0