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