From: Dmitry Safonov <dima@arista.com>
To: linux-kernel@vger.kernel.org
Cc: Andrei Vagin <avagin@gmail.com>, Dmitry Safonov <dima@arista.com>,
Adrian Reber <adrian@lisas.de>, Andrei Vagin <avagin@openvz.org>,
Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Christian Brauner <christian.brauner@ubuntu.com>,
Cyrill Gorcunov <gorcunov@openvz.org>,
Dmitry Safonov <0x7f454c46@gmail.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
Jann Horn <jannh@google.com>, Jeff Dike <jdike@addtoit.com>,
Oleg Nesterov <oleg@redhat.com>,
Pavel Emelyanov <xemul@virtuozzo.com>,
Shuah Khan <shuah@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
containers@lists.linux-foundation.org, criu@openvz.org,
linux-api@vger.kernel.org, x86@kernel.org
Subject: [PATCHv4 27/28] selftests: Add a simple perf test for clock_gettime()
Date: Wed, 12 Jun 2019 20:26:26 +0100 [thread overview]
Message-ID: <20190612192628.23797-28-dima@arista.com> (raw)
In-Reply-To: <20190612192628.23797-1-dima@arista.com>
From: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
tools/testing/selftests/timens/.gitignore | 2 +
tools/testing/selftests/timens/Makefile | 8 +-
tools/testing/selftests/timens/gettime_perf.c | 74 +++++++++++++++++++
.../selftests/timens/gettime_perf_cold.c | 63 ++++++++++++++++
4 files changed, 146 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timens/gettime_perf.c
create mode 100644 tools/testing/selftests/timens/gettime_perf_cold.c
diff --git a/tools/testing/selftests/timens/.gitignore b/tools/testing/selftests/timens/.gitignore
index 3b7eda8f35ce..16292e4d08a5 100644
--- a/tools/testing/selftests/timens/.gitignore
+++ b/tools/testing/selftests/timens/.gitignore
@@ -1,4 +1,6 @@
clock_nanosleep
+gettime_perf
+gettime_perf_cold
procfs
timens
timer
diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile
index ae1ffd24cc43..ef65bf96b55c 100644
--- a/tools/testing/selftests/timens/Makefile
+++ b/tools/testing/selftests/timens/Makefile
@@ -1,4 +1,10 @@
-TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs
+TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs gettime_perf
+
+uname_M := $(shell uname -m 2>/dev/null || echo not)
+ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/i386/)
+ifeq ($(ARCH),x86_64)
+TEST_GEN_PROGS += gettime_perf_cold
+endif
CFLAGS := -Wall -Werror
LDFLAGS := -lrt
diff --git a/tools/testing/selftests/timens/gettime_perf.c b/tools/testing/selftests/timens/gettime_perf.c
new file mode 100644
index 000000000000..510d77a941d9
--- /dev/null
+++ b/tools/testing/selftests/timens/gettime_perf.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+#include "log.h"
+#include "timens.h"
+
+//#define TEST_SYSCALL
+
+static void test(clock_t clockid, char *clockstr, bool in_ns)
+{
+ struct timespec tp, start;
+ long i = 0;
+ const int timeout = 3;
+
+#ifndef TEST_SYSCALL
+ clock_gettime(clockid, &start);
+#else
+ syscall(__NR_clock_gettime, clockid, &start);
+#endif
+ tp = start;
+ for (tp = start; start.tv_sec + timeout > tp.tv_sec ||
+ (start.tv_sec + timeout == tp.tv_sec &&
+ start.tv_nsec > tp.tv_nsec); i++) {
+#ifndef TEST_SYSCALL
+ clock_gettime(clockid, &tp);
+#else
+ syscall(__NR_clock_gettime, clockid, &tp);
+#endif
+ }
+
+ ksft_test_result_pass("%s:\tclock: %10s\tcycles:\t%10ld\n",
+ in_ns ? "ns" : "host", clockstr, i);
+}
+
+int main(int argc, char *argv[])
+{
+ time_t offset = 10;
+ int nsfd;
+
+ test(CLOCK_MONOTONIC, "monotonic", false);
+ test(CLOCK_BOOTTIME, "boottime", false);
+
+ nscheck();
+
+ if (unshare(CLONE_NEWTIME))
+ return pr_perror("Can't unshare() timens");
+
+ nsfd = open("/proc/self/ns/time_for_children", O_RDONLY);
+ if (nsfd < 0)
+ return pr_perror("Can't open a time namespace");
+
+ if (_settime(CLOCK_MONOTONIC, offset))
+ return 1;
+ if (_settime(CLOCK_BOOTTIME, offset))
+ return 1;
+
+ if (setns(nsfd, CLONE_NEWTIME))
+ return pr_perror("setns");
+
+ test(CLOCK_MONOTONIC, "monotonic", true);
+ test(CLOCK_BOOTTIME, "boottime", true);
+
+ ksft_exit_pass();
+ return 0;
+}
diff --git a/tools/testing/selftests/timens/gettime_perf_cold.c b/tools/testing/selftests/timens/gettime_perf_cold.c
new file mode 100644
index 000000000000..f72db8a4c903
--- /dev/null
+++ b/tools/testing/selftests/timens/gettime_perf_cold.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <string.h>
+
+#include "log.h"
+#include "timens.h"
+
+static __inline__ unsigned long long rdtsc(void)
+{
+ unsigned hi, lo;
+
+ __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
+ return ((unsigned long long) lo) | (((unsigned long long)hi) << 32);
+}
+
+static void test(clock_t clockid, char *clockstr)
+{
+ struct timespec tp;
+ long long s, e;
+
+ s = rdtsc();
+ clock_gettime(clockid, &tp);
+ e = rdtsc();
+ printf("%lld\n", e - s);
+ return;
+}
+
+int main(int argc, char **argv)
+{
+ time_t offset = 10;
+ int nsfd;
+
+ if (argc == 1) {
+ test(CLOCK_MONOTONIC, "monotonic");
+ return 0;
+ }
+ nscheck();
+
+ if (unshare(CLONE_NEWTIME))
+ return pr_perror("Can't unshare() timens");
+
+ nsfd = open("/proc/self/ns/time_for_children", O_RDONLY);
+ if (nsfd < 0)
+ return pr_perror("Can't open a time namespace");
+
+ if (_settime(CLOCK_MONOTONIC, offset))
+ return 1;
+
+ if (setns(nsfd, CLONE_NEWTIME))
+ return pr_perror("setns");
+
+ test(CLOCK_MONOTONIC, "monotonic");
+ return 0;
+}
--
2.22.0
next prev parent reply other threads:[~2019-06-12 19:27 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-12 19:25 [PATCHv4 00/28] kernel: Introduce Time Namespace Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 01/28] ns: " Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 02/28] timens: Add timens_offsets Dmitry Safonov
2019-06-14 13:11 ` Thomas Gleixner
2019-06-14 14:32 ` Dmitry Safonov
2019-07-29 22:26 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 03/28] posix-clocks: add another call back to return clock time in ktime_t Dmitry Safonov
2019-06-14 13:32 ` Thomas Gleixner
2019-06-14 14:39 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 04/28] timens: Introduce CLOCK_MONOTONIC offsets Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 05/28] timens: Introduce CLOCK_BOOTTIME offset Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 06/28] timerfd/timens: Take into account ns clock offsets Dmitry Safonov
2019-06-14 13:37 ` Thomas Gleixner
2019-06-16 17:43 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 07/28] posix-timers/timens: Take into account " Dmitry Safonov
2019-06-14 13:42 ` Thomas Gleixner
2019-06-16 17:45 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 08/28] timens/kernel: Take into account timens clock offsets in clock_nanosleep Dmitry Safonov
2019-06-14 13:49 ` Thomas Gleixner
2019-06-12 19:26 ` [PATCHv4 09/28] timens: Shift /proc/uptime Dmitry Safonov
2019-06-14 13:50 ` Thomas Gleixner
2019-06-16 17:48 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 10/28] x86/vdso2c: Correct err messages on file opening Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 11/28] x86/vdso2c: Convert iterator to unsigned Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 12/28] x86/vdso/Makefile: Add vobjs32 Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 13/28] x86/vdso: Restrict splitting VVAR VMA Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 14/28] x86/vdso: Rename vdso_image {.data=>.text} Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 15/28] x86/vdso: Add offsets page in vvar Dmitry Safonov
2019-06-14 13:58 ` Thomas Gleixner
2019-06-16 17:49 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 16/28] x86/vdso: Allocate timens vdso Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 17/28] x86/vdso: Switch image on setns()/unshare()/clone() Dmitry Safonov
2019-06-14 14:05 ` Thomas Gleixner
2019-06-16 17:51 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 18/28] vdso: introduce timens_static_branch Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 19/28] timens: Add align for timens_offsets Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 20/28] timens/fs/proc: Introduce /proc/pid/timens_offsets Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 21/28] selftest/timens: Add Time Namespace test for supported clocks Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 22/28] selftest/timens: Add a test for timerfd Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 23/28] selftest/timens: Add a test for clock_nanosleep() Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 24/28] selftest/timens: Add procfs selftest Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 25/28] selftest/timens: Add timer offsets test Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 26/28] x86/vdso: Align VDSO functions by CPU L1 cache line Dmitry Safonov
2019-06-14 14:13 ` Thomas Gleixner
2019-06-23 5:26 ` Andrei Vagin
2019-06-12 19:26 ` Dmitry Safonov [this message]
2019-06-12 19:26 ` [PATCHv4 28/28] selftest/timens: Check that a right vdso is mapped after fork and exec Dmitry Safonov
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