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Date: Wed, 22 Feb 2023 15:46:49 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Alexey Dobriyan <adobriyan@...il.com>,
Wei Li <liwei391@...wei.com>,
Peter Zijlstra <peterz@...radead.org>,
Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>,
Yu Liao <liaoyu15@...wei.com>, Hillf Danton <hdanton@...a.com>,
Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 8/8] selftests/proc: Assert clock_gettime(CLOCK_BOOTTIME) VS /proc/uptime monotonicity
The first field of /proc/uptime relies on the CLOCK_BOOTTIME clock which
can also be fetched from clock_gettime() API.
Improve the test coverage while verifying the monotonicity of
CLOCK_BOOTTIME accross both interfaces.
Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Yu Liao <liaoyu15@...wei.com>
Cc: Hillf Danton <hdanton@...a.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Wei Li <liwei391@...wei.com>
Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
.../testing/selftests/proc/proc-uptime-001.c | 21 ++++++++++++++----
.../testing/selftests/proc/proc-uptime-002.c | 22 +++++++++++++++----
tools/testing/selftests/proc/proc-uptime.h | 12 ++++++++++
3 files changed, 47 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/proc/proc-uptime-001.c b/tools/testing/selftests/proc/proc-uptime-001.c
index 35bddd9dd60b..f335eec5067e 100644
--- a/tools/testing/selftests/proc/proc-uptime-001.c
+++ b/tools/testing/selftests/proc/proc-uptime-001.c
@@ -13,9 +13,9 @@
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
-// Test that boottime value in /proc/uptime increments monotonically.
-// We don't test idle time monotonicity due to broken iowait task
-// counting, cf: comment above get_cpu_idle_time_us()
+// Test that boottime value in /proc/uptime and CLOCK_BOOTTIME increment
+// monotonically. We don't test idle time monotonicity due to broken iowait
+// task counting, cf: comment above get_cpu_idle_time_us()
#undef NDEBUG
#include <assert.h>
#include <stdint.h>
@@ -27,7 +27,7 @@
int main(void)
{
- uint64_t start, u0, u1;
+ uint64_t start, u0, u1, c0, c1;
int fd;
fd = open("/proc/uptime", O_RDONLY);
@@ -35,10 +35,23 @@ int main(void)
u0 = proc_uptime(fd);
start = u0;
+ c0 = clock_boottime();
+
do {
u1 = proc_uptime(fd);
+ c1 = clock_boottime();
+
+ /* Is /proc/uptime monotonic ? */
assert(u1 >= u0);
+
+ /* Is CLOCK_BOOTTIME monotonic ? */
+ assert(c1 >= c0);
+
+ /* Is CLOCK_BOOTTIME VS /proc/uptime monotonic ? */
+ assert(c0 >= u0);
+
u0 = u1;
+ c0 = c1;
} while (u1 - start < 100);
return 0;
diff --git a/tools/testing/selftests/proc/proc-uptime-002.c b/tools/testing/selftests/proc/proc-uptime-002.c
index 7ad79d5eaa84..ae453daa96c1 100644
--- a/tools/testing/selftests/proc/proc-uptime-002.c
+++ b/tools/testing/selftests/proc/proc-uptime-002.c
@@ -13,9 +13,10 @@
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
-// Test that boottime value in /proc/uptime increments monotonically
-// while shifting across CPUs. We don't test idle time monotonicity
-// due to broken iowait task counting, cf: comment above get_cpu_idle_time_us()
+// Test that boottime value in /proc/uptime and CLOCK_BOOTTIME increment
+// monotonically while shifting across CPUs. We don't test idle time
+// monotonicity due to broken iowait task counting, cf: comment above
+// get_cpu_idle_time_us()
#undef NDEBUG
#include <assert.h>
#include <errno.h>
@@ -43,10 +44,10 @@ static inline int sys_sched_setaffinity(pid_t pid, unsigned int len, unsigned lo
int main(void)
{
+ uint64_t u0, u1, c0, c1;
unsigned int len;
unsigned long *m;
unsigned int cpu;
- uint64_t u0, u1;
int fd;
/* find out "nr_cpu_ids" */
@@ -62,6 +63,8 @@ int main(void)
assert(fd >= 0);
u0 = proc_uptime(fd);
+ c0 = clock_boottime();
+
for (cpu = 0; cpu < len * 8; cpu++) {
memset(m, 0, len);
m[cpu / (8 * sizeof(unsigned long))] |= 1UL << (cpu % (8 * sizeof(unsigned long)));
@@ -70,8 +73,19 @@ int main(void)
sys_sched_setaffinity(0, len, m);
u1 = proc_uptime(fd);
+ c1 = clock_boottime();
+
+ /* Is /proc/uptime monotonic ? */
assert(u1 >= u0);
+
+ /* Is CLOCK_BOOTTIME monotonic ? */
+ assert(c1 >= c0);
+
+ /* Is CLOCK_BOOTTIME VS /proc/uptime monotonic ? */
+ assert(c0 >= u0);
+
u0 = u1;
+ c0 = c1;
}
return 0;
diff --git a/tools/testing/selftests/proc/proc-uptime.h b/tools/testing/selftests/proc/proc-uptime.h
index ca55abeb0ccc..730cce4a3d73 100644
--- a/tools/testing/selftests/proc/proc-uptime.h
+++ b/tools/testing/selftests/proc/proc-uptime.h
@@ -19,9 +19,21 @@
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
+#include <time.h>
#include "proc.h"
+static uint64_t clock_boottime(void)
+{
+ struct timespec ts;
+ int err;
+
+ err = clock_gettime(CLOCK_BOOTTIME, &ts);
+ assert(err >= 0);
+
+ return (ts.tv_sec * 100) + (ts.tv_nsec / 10000000);
+}
+
static uint64_t proc_uptime(int fd)
{
uint64_t val1, val2;
--
2.34.1
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