linux-kernel - Re: [PATCH v9 7/7] kselftests: Add tests for the preemptoff and irqsoff tracers

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Date:   Tue, 10 Jul 2018 20:49:58 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org, Boqun Feng <boqun.feng@...il.com>,
        Byungchul Park <byungchul.park@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Julia Cartwright <julia@...com>,
        linux-kselftest@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Glexiner <tglx@...utronix.de>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: Re: [PATCH v9 7/7] kselftests: Add tests for the preemptoff and
 irqsoff tracers

On Thu, 28 Jun 2018 11:21:49 -0700
Joel Fernandes <joel@...lfernandes.org> wrote:

> From: "Joel Fernandes (Google)" <joel@...lfernandes.org>
> 
> 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.
> 
> Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>

This looks fine. The only patch that needs to be changed and resent is
patch 6 and 7. Just send 6, and this one again because it depends on
patch 6.

I'll go ahead and apply 1-5 and kick off my other tests.

Thanks!

-- Steve


> ---
>  tools/testing/selftests/ftrace/config         |  3 +
>  .../test.d/preemptirq/irqsoff_tracer.tc       | 73 +++++++++++++++++++
>  2 files changed, 76 insertions(+)
>  create mode 100644 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 100644
> index 000000000000..1806d340035d
> --- /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=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