On Mon, Jun 25, 2018 at 10:13:02PM +0900, Masami Hiramatsu wrote:
> Hi Joel,
>
> On Thu, 21 Jun 2018 15:32:36 -0700
> Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> wrote:
> [...]
> > +++ 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 test_atomic_sections atomic_mode=preempt atomic_time=500000 || fail
> > +rmmod test_atomic_sections || fail
> > +modprobe test_atomic_sections atomic_mode=preempt atomic_time=500000 || fail
> > +rmmod test_atomic_sections || fail
> > +modprobe test_atomic_sections atomic_mode=preempt atomic_time=500000 || fail
> > +rmmod test_atomic_sections || fail
>
> Why don't you use $MOD for these operations?
Yes, I will. Thanks for the suggestion.
> > +
> > +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 test_atomic_sections atomic_mode=irq atomic_time=500000 || fail
> > +rmmod test_atomic_sections || fail
> > +modprobe test_atomic_sections atomic_mode=irq atomic_time=500000 || fail
> > +rmmod test_atomic_sections || fail
> > +modprobe test_atomic_sections atomic_mode=irq atomic_time=500000 || fail
> > +rmmod test_atomic_sections || fail
>
> Ditto.
Done.
> Other parts looks good to me.
Cool, updated this patch below as "v9.1" ;-)
thanks!
- Joel
---8<-----------------
From: "Joel Fernandes (Google)" <joel@xxxxxxxxxxxxxxxxx>
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.
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
---
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
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