tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: test for the preemptirqsoff tracer
   4 # requires: preemptoff:tracer irqsoff:tracer
   5
   6 MOD=preemptirq_delay_test
   7
   8 fail() {
   9     reset_tracer
  10     rmmod $MOD || true
  11     exit_fail
  12 }
  13
  14 unsup() { #msg
  15     reset_tracer
  16     rmmod $MOD || true
  17     echo $1
  18     exit_unsupported
  19 }
  20
  21 unres() { #msg
  22     reset_tracer
  23     rmmod $MOD || true
  24     echo $1
  25     exit_unresolved
  26 }
  27
  28 modprobe $MOD || unres "$MOD module not available"
  29 rmmod $MOD
  30
  31 reset_tracer
  32
  33 # Simulate preemptoff section for half a second couple of times
  34 echo preemptoff > current_tracer
  35 sleep 1
  36 modprobe $MOD test_mode=preempt delay=500000 || fail
  37 rmmod $MOD || fail
  38 modprobe $MOD test_mode=preempt delay=500000 || fail
  39 rmmod $MOD || fail
  40 modprobe $MOD test_mode=preempt delay=500000 || fail
  41 rmmod $MOD || fail
  42
  43 cat trace
  44
  45 # Confirm which tracer
  46 grep -q "tracer: preemptoff" trace || fail
  47
  48 # Check the end of the section
  49 grep -E -q "5.....us : <stack trace>" trace || fail
  50
  51 # Check for 500ms of latency
  52 grep -E -q "latency: 5..... us" trace || fail
  53
  54 reset_tracer
  55
  56 # Simulate irqsoff section for half a second couple of times
  57 echo irqsoff > current_tracer
  58 sleep 1
  59 modprobe $MOD test_mode=irq delay=500000 || fail
  60 rmmod $MOD || fail
  61 modprobe $MOD test_mode=irq delay=500000 || fail
  62 rmmod $MOD || fail
  63 modprobe $MOD test_mode=irq delay=500000 || fail
  64 rmmod $MOD || fail
  65
  66 cat trace
  67
  68 # Confirm which tracer
  69 grep -q "tracer: irqsoff" trace || fail
  70
  71 # Check the end of the section
  72 grep -E -q "5.....us : <stack trace>" trace || fail
  73
  74 # Check for 500ms of latency
  75 grep -E -q "latency: 5..... us" trace || fail
  76
  77 reset_tracer
  78 exit 0