On Mon, 25 Jun 2018 09:21:02 -0700 Joel Fernandes <[email protected]> wrote:
> > From: "Joel Fernandes (Google)" <[email protected]> > Subject: [PATCH v9.1 7/7] 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 atomic sections in the > kernel. > Looks good to me. Acked-by: Masami Hiramatsu <[email protected]> Thanks! > Signed-off-by: Joel Fernandes (Google) <[email protected]> > --- > tools/testing/selftests/ftrace/config | 3 + > .../test.d/preemptirq/irqsoff_tracer.tc | 74 +++++++++++++++++++ > 2 files changed, 77 insertions(+) > create mode 100755 > tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc > > diff --git a/tools/testing/selftests/ftrace/config > b/tools/testing/selftests/ftrace/config > index b01924c71c09..29588b328345 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_TEST_ATOMIC_SECTIONS=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 100755 > index 000000000000..2dcd5e4cafb4 > --- /dev/null > +++ b/tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc > @@ -0,0 +1,74 @@ > +#!/bin/sh > +# SPDX-License-Identifier: GPL-2.0 > +# description: test for the preemptirqsoff tracer > + > +MOD=test_atomic_sections > + > +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 atomic_mode=preempt atomic_time=500000 || fail > +rmmod $MOD || fail > +modprobe $MOD atomic_mode=preempt atomic_time=500000 || fail > +rmmod $MOD || fail > +modprobe $MOD atomic_mode=preempt atomic_time=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 atomic_mode=irq atomic_time=500000 || fail > +rmmod $MOD || fail > +modprobe $MOD atomic_mode=irq atomic_time=500000 || fail > +rmmod $MOD || fail > +modprobe $MOD atomic_mode=irq atomic_time=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 > + > -- > 2.18.0.rc2.346.g013aa6912e-goog > -- Masami Hiramatsu <[email protected]>
