Adds the clocksource-switch tests which continually switches the
current clocksource between all the available ones, watching for
any timekeeping inconsistencies.
Cc: Shuah Khan <shua...@osg.samsung.com>
Cc: Prarit Bhargava <pra...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Richard Cochran <richardcoch...@gmail.com>
Signed-off-by: John Stultz <john.stu...@linaro.org>
---
tools/testing/selftests/timers/Makefile | 3 +-
.../testing/selftests/timers/clocksource-switch.c | 165 +++++++++++++++++++++
2 files changed, 167 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timers/clocksource-switch.c
diff --git a/tools/testing/selftests/timers/Makefile
b/tools/testing/selftests/timers/Makefile
index 68b5253..d50a1ef 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 skew_consistency
+ alarmtimer-suspend change_skew skew_consistency clocksource-switch \
all: ${bins}
@@ -26,6 +26,7 @@ run_destructive_tests: run_tests
./valid-adjtimex
./change_skew
./skew_consistency
+ ./clocksource-switch
clean:
rm -f ${bins}
diff --git a/tools/testing/selftests/timers/clocksource-switch.c
b/tools/testing/selftests/timers/clocksource-switch.c
new file mode 100644
index 0000000..0b36cae
--- /dev/null
+++ b/tools/testing/selftests/timers/clocksource-switch.c
@@ -0,0 +1,165 @@
+/* Clocksource change test
+ * by: john stultz (johns...@us.ibm.com)
+ * (C) Copyright IBM 2012
+ * Licensed under the GPLv2
+ *
+ * NOTE: This is a meta-test which quickly changes the clocksourc and
+ * then uses other tests to detect problems. Thus this test requires
+ * that the inconsistency-check and nanosleep tests be present in the
+ * same directory it is run from.
+ *
+ * To build:
+ * $ gcc clocksource-switch.c -o clocksource-switch -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 <string.h>
+#include <sys/wait.h>
+
+
+int get_clocksources(char list[][30])
+{
+ int fd, i, count;
+ size_t size;
+ char buf[512];
+ char *head, *tmp;
+
+ fd =
open("/sys/devices/system/clocksource/clocksource0/available_clocksource",
O_RDONLY);
+
+ size = read(fd, buf, 512);
+
+ close(fd);
+
+ for (i = 0; i < 30; i++)
+ list[i][0] = '\0';
+
+ head = buf;
+ i = 0;
+ while (head - buf < size) {
+ /* Find the next space */
+ for (tmp = head; *tmp != ' '; tmp++) {
+ if (*tmp == '\n')
+ break;
+ if (*tmp == '\0')
+ break;
+ }
+ *tmp = '\0';
+ strcpy(list[i], head);
+ head = tmp + 1;
+ i++;
+ }
+
+ return i-1;
+}
+
+int get_cur_clocksource(char *buf, size_t size)
+{
+ int fd, i, count;
+ char *head, *tmp;
+
+ fd =
open("/sys/devices/system/clocksource/clocksource0/current_clocksource",
O_RDONLY);
+
+ size = read(fd, buf, size);
+
+ return 0;
+}
+
+int change_clocksource(char *clocksource)
+{
+ int fd, ret, count;
+ size_t size;
+ char buf[512];
+ char *head, *tmp;
+
+ fd =
open("/sys/devices/system/clocksource/clocksource0/current_clocksource",
O_WRONLY);
+
+ if (fd < 0)
+ return -1;
+
+ size = write(fd, clocksource, strlen(clocksource));
+
+ if (size < 0)
+ return -1;
+
+ close(fd);
+ return 0;
+}
+
+
+int run_tests(int secs)
+{
+ int ret;
+ char buf[255];
+
+ sprintf(buf, "./inconsistency-check -t %i", secs);
+ ret = system(buf);
+ if (ret)
+ return ret;
+ ret = system("./nanosleep");
+ return ret;
+}
+
+
+char clocksource_list[10][30];
+
+int main(int argv, char **argc)
+{
+ char orig_clk[512];
+ int count, i, status;
+ pid_t pid, w;
+
+ get_cur_clocksource(orig_clk, 512);
+
+ count = get_clocksources(clocksource_list);
+
+ if (change_clocksource(clocksource_list[0])) {
+ printf("Error: You probably need to run this as root\n");
+ return -1;
+ }
+
+ /* Check everything is sane before we start switching asyncrhonously */
+ for (i = 0; i < count; i++) {
+ printf("Validating clocksource %s\n", clocksource_list[i]);
+ if (change_clocksource(clocksource_list[i])) {
+ status = -1;
+ goto out;
+ }
+ if (run_tests(5)) {
+ status = -1;
+ goto out;
+ }
+ }
+
+
+ printf("Running Asyncrhonous Switching Tests...\n");
+ pid = fork();
+ if (!pid)
+ return run_tests(60);
+
+ while (pid != waitpid(pid, &status, WNOHANG))
+ for (i = 0; i < count; i++)
+ if (change_clocksource(clocksource_list[i])) {
+ status = -1;
+ goto out;
+ }
+out:
+ change_clocksource(orig_clk);
+ return status;
+}
--
1.9.1
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