linux-kernel - [PATCH 13/19] selftests/timers: Add skew_consistency test from the timetests suite

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Message-Id: <1424903544-26855-14-git-send-email-john.stultz@linaro.org>
Date:	Wed, 25 Feb 2015 14:32:18 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Shuah Khan <shuahkh@....samsung.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richardcochran@...il.com>
Subject: [PATCH 13/19] selftests/timers: Add skew_consistency test from the timetests suite

This change adds the skew_consistency test, which twists the
ADJ_FREQUENCY knob back and forth and watches for timekeeping
inconsistencies.

Cc: Shuah Khan <shuahkh@....samsung.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Richard Cochran <richardcochran@...il.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 tools/testing/selftests/timers/Makefile           |  3 +-
 tools/testing/selftests/timers/skew_consistency.c | 75 +++++++++++++++++++++++
 2 files changed, 77 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/timers/skew_consistency.c

diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index c3e32f1..68b5253 100644
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -2,7 +2,7 @@ CFLAGS += -O3 -Wl,-no-as-needed
 LDFLAGS += -lrt -lpthread
 bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \
 	set-timer-lat threadtest mqueue-lat valid-adjtimex \
-	alarmtimer-suspend change_skew
+	alarmtimer-suspend change_skew skew_consistency
 
 all: ${bins}
 
@@ -25,6 +25,7 @@ run_destructive_tests: run_tests
 	./alarmtimer-suspend
 	./valid-adjtimex
 	./change_skew
+	./skew_consistency
 
 clean:
 	rm -f ${bins}
diff --git a/tools/testing/selftests/timers/skew_consistency.c b/tools/testing/selftests/timers/skew_consistency.c
new file mode 100644
index 0000000..5c4b53a
--- /dev/null
+++ b/tools/testing/selftests/timers/skew_consistency.c
@@ -0,0 +1,75 @@
+/* ADJ_FREQ Skew consistency test
+ *		by: john stultz (johnstul@...ibm.com)
+ *		(C) Copyright IBM 2012
+ *		Licensed under the GPLv2
+ *
+ *  NOTE: This is a meta-test which cranks the ADJ_FREQ knob back
+ *  and forth and watches for consistency problems. Thus this test requires
+ *  that the inconsistency-check tests be present in the same directory it
+ *  is run from.
+ *
+ *  To build:
+ *	$ gcc skew_consistency.c -o skew_consistency -lrt
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ */
+
+
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+
+#define NSEC_PER_SEC 1000000000LL
+
+int main(int argv, char **argc)
+{
+	struct timex tx;
+	int ret, ppm;
+	pid_t pid;
+
+
+	printf("Running Asyncrhonous Frequency Changing Tests...\n");
+
+	pid = fork();
+	if (!pid)
+		return system("./inconsistency-check -c 1 -t 600");
+
+	ppm = 500;
+	ret = 0;
+
+	while (pid != waitpid(pid, &ret, WNOHANG)) {
+		ppm = -ppm;
+		tx.modes = ADJ_FREQUENCY;
+		tx.freq = ppm << 16;
+		adjtimex(&tx);
+		usleep(500000);
+	}
+
+	if (ret)
+		printf("[FAILED]\n");
+	else
+		printf("[OK]\n");
+
+
+	/* Set things back */
+	tx.modes = ADJ_FREQUENCY;
+	tx.offset = 0;
+	adjtimex(&tx);
+
+	return ret;
+}
-- 
1.9.1

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