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| author |   Joel Fernandes (Google) <joel@joelfernandes.org> | 2018-07-10 23:35:40 -0700 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-07-26 10:50:17 -0400 |
| commit | 8bd1369b4c2b532865b706c97f1a8ae4c6a36a71 (patch) | |
| tree | 8d7611205aeed604ada06050bf8933c338513ac3 /tools/testing/selftests/ftrace | |
| parent | lib: Add module for testing preemptoff/irqsoff latency tracers (diff) | |
| download | wireguard-linux-8bd1369b4c2b532865b706c97f1a8ae4c6a36a71.tar.xz wireguard-linux-8bd1369b4c2b532865b706c97f1a8ae4c6a36a71.zip | |
kselftests: Add tests for the preemptoff and irqsoff tracers
Here we add unit tests for the preemptoff and irqsoff tracer by using a
kernel module introduced previously to trigger long preempt or irq
disabled sections in the kernel.
Link: http://lkml.kernel.org/r/20180711063540.91101-3-joel@joelfernandes.org
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/testing/selftests/ftrace')
| -rw-r--r-- | tools/testing/selftests/ftrace/config | 3 | ||||
| -rw-r--r-- | tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc | 73 |
2 files changed, 76 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftests/ftrace/config index b01924c71c09..07db5ab09cc7 100644 --- a/tools/testing/selftests/ftrace/config +++ b/tools/testing/selftests/ftrace/config @@ -4,3 +4,6 @@ CONFIG_FUNCTION_PROFILER=y CONFIG_TRACER_SNAPSHOT=y CONFIG_STACK_TRACER=y CONFIG_HIST_TRIGGERS=y +CONFIG_PREEMPT_TRACER=y +CONFIG_IRQSOFF_TRACER=y +CONFIG_PREEMPTIRQ_DELAY_TEST=m diff --git a/tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc b/tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc new file mode 100644 index 000000000000..cbd174334a48 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc @@ -0,0 +1,73 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: test for the preemptirqsoff tracer + +MOD=preemptirq_delay_test + +fail() { + reset_tracer + rmmod $MOD || true + exit_fail +} + +unsup() { #msg + reset_tracer + rmmod $MOD || true + echo $1 + exit_unsupported +} + +modprobe $MOD || unsup "$MOD module not available" +rmmod $MOD + +grep -q "preemptoff" available_tracers || unsup "preemptoff tracer not enabled" +grep -q "irqsoff" available_tracers || unsup "irqsoff tracer not enabled" + +reset_tracer + +# Simulate preemptoff section for half a second couple of times +echo preemptoff > current_tracer +sleep 1 +modprobe $MOD test_mode=preempt delay=500000 || fail +rmmod $MOD || fail +modprobe $MOD test_mode=preempt delay=500000 || fail +rmmod $MOD || fail +modprobe $MOD test_mode=preempt delay=500000 || fail +rmmod $MOD || fail + +cat trace + +# Confirm which tracer +grep -q "tracer: preemptoff" trace || fail + +# Check the end of the section +egrep -q "5.....us : <stack trace>" trace || fail + +# Check for 500ms of latency +egrep -q "latency: 5..... us" trace || fail + +reset_tracer + +# Simulate irqsoff section for half a second couple of times +echo irqsoff > current_tracer +sleep 1 +modprobe $MOD test_mode=irq delay=500000 || fail +rmmod $MOD || fail +modprobe $MOD test_mode=irq delay=500000 || fail +rmmod $MOD || fail +modprobe $MOD test_mode=irq delay=500000 || fail +rmmod $MOD || fail + +cat trace + +# Confirm which tracer +grep -q "tracer: irqsoff" trace || fail + +# Check the end of the section +egrep -q "5.....us : <stack trace>" trace || fail + +# Check for 500ms of latency +egrep -q "latency: 5..... us" trace || fail + +reset_tracer +exit 0 |