From: Dmitry Safonov <dima@arista.com>
To: linux-kernel@vger.kernel.org
Cc: Dmitry Safonov <0x7f454c46@gmail.com>,
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>,
"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: [PATCHv5 07/37] posix-clocks: Introduce clock_get_ktime() callback
Date: Mon, 29 Jul 2019 22:56:49 +0100 [thread overview]
Message-ID: <20190729215758.28405-8-dima@arista.com> (raw)
In-Reply-To: <20190729215758.28405-1-dima@arista.com>
From: Andrei Vagin <avagin@gmail.com>
The callsite in common_timer_get() has already a comment:
/*
* The timespec64 based conversion is suboptimal, but it's not
* worth to implement yet another callback.
*/
kc->clock_get(timr->it_clock, &ts64);
now = timespec64_to_ktime(ts64);
The upcoming support for time namespaces requires to have access to:
- The time in a task's time namespace for sys_clock_gettime()
- The time in the root name space for common_timer_get()
That adds a valid reason to finally implement a separate callback which
returns the time in ktime_t format.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
kernel/time/alarmtimer.c | 19 ++++++++++++++++++-
kernel/time/posix-timers.c | 26 +++++++++++++++++++++++++-
kernel/time/posix-timers.h | 3 +++
3 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index d9e6baa9976a..55cb6e78d082 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -651,7 +651,7 @@ static int alarm_clock_getres(const clockid_t which_clock, struct timespec64 *tp
* @which_clock: clockid
* @tp: timespec to fill.
*
- * Provides the underlying alarm base time.
+ * Provides the underlying alarm base time in a tasks time namespace.
*/
static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp)
{
@@ -663,6 +663,22 @@ static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp
return base->get_timespec(base->base_clockid, tp);
}
+/**
+ * alarm_clock_get_ktime - posix clock_get_ktime interface
+ * @which_clock: clockid
+ *
+ * Provides the underlying alarm base time in the root namespace.
+ */
+static ktime_t alarm_clock_get_ktime(clockid_t which_clock)
+{
+ struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)];
+
+ if (!alarmtimer_get_rtcdev())
+ return -EINVAL;
+
+ return base->get_ktime();
+}
+
/**
* alarm_timer_create - posix timer_create interface
* @new_timer: k_itimer pointer to manage
@@ -826,6 +842,7 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
const struct k_clock alarm_clock = {
.clock_getres = alarm_clock_getres,
+ .clock_get_ktime = alarm_clock_get_ktime,
.clock_get_timespec = alarm_clock_get_timespec,
.timer_create = alarm_timer_create,
.timer_set = common_timer_set,
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index a600b8b3e9bf..fb1848c84241 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -172,6 +172,11 @@ posix_clock_realtime_get_timespec(clockid_t which_clock, struct timespec64 *tp)
return 0;
}
+static ktime_t posix_clock_realtime_get_ktime(clockid_t which_clock)
+{
+ return ktime_get_real();
+}
+
/* Set clock_realtime */
static int posix_clock_realtime_set(const clockid_t which_clock,
const struct timespec64 *tp)
@@ -194,6 +199,11 @@ int posix_get_timespec(clockid_t which_clock, struct timespec64 *tp)
return 0;
}
+static ktime_t posix_get_ktime(clockid_t which_clock)
+{
+ return ktime_get();
+}
+
/*
* Get monotonic-raw time for posix timers
*/
@@ -229,12 +239,22 @@ int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *
return 0;
}
+static ktime_t posix_get_boottime_ktime(const clockid_t which_clock)
+{
+ return ktime_get_boottime();
+}
+
static int posix_get_tai_timespec(clockid_t which_clock, struct timespec64 *tp)
{
ktime_get_clocktai_ts64(tp);
return 0;
}
+static ktime_t posix_get_tai_ktime(clockid_t which_clock)
+{
+ return ktime_get_clocktai();
+}
+
static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp)
{
tp->tv_sec = 0;
@@ -782,7 +802,7 @@ static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires,
* Posix magic: Relative CLOCK_REALTIME timers are not affected by
* clock modifications, so they become CLOCK_MONOTONIC based under the
* hood. See hrtimer_init(). Update timr->kclock, so the generic
- * functions which use timr->kclock->clock_get_timespec() work.
+ * functions which use timr->kclock->clock_get_*() work.
*
* Note: it_clock stays unmodified, because the next timer_set() might
* use ABSTIME, so it needs to switch back.
@@ -1228,6 +1248,7 @@ SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags,
static const struct k_clock clock_realtime = {
.clock_getres = posix_get_hrtimer_res,
.clock_get_timespec = posix_clock_realtime_get_timespec,
+ .clock_get_ktime = posix_clock_realtime_get_ktime,
.clock_set = posix_clock_realtime_set,
.clock_adj = posix_clock_realtime_adj,
.nsleep = common_nsleep,
@@ -1245,6 +1266,7 @@ static const struct k_clock clock_realtime = {
static const struct k_clock clock_monotonic = {
.clock_getres = posix_get_hrtimer_res,
.clock_get_timespec = posix_get_timespec,
+ .clock_get_ktime = posix_get_ktime,
.nsleep = common_nsleep,
.timer_create = common_timer_create,
.timer_set = common_timer_set,
@@ -1274,6 +1296,7 @@ static const struct k_clock clock_monotonic_coarse = {
static const struct k_clock clock_tai = {
.clock_getres = posix_get_hrtimer_res,
+ .clock_get_ktime = posix_get_tai_ktime,
.clock_get_timespec = posix_get_tai_timespec,
.nsleep = common_nsleep,
.timer_create = common_timer_create,
@@ -1289,6 +1312,7 @@ static const struct k_clock clock_tai = {
static const struct k_clock clock_boottime = {
.clock_getres = posix_get_hrtimer_res,
+ .clock_get_ktime = posix_get_boottime_ktime,
.clock_get_timespec = posix_get_boottime_timespec,
.nsleep = common_nsleep,
.timer_create = common_timer_create,
diff --git a/kernel/time/posix-timers.h b/kernel/time/posix-timers.h
index b3cc9ee36a6b..183994f7e466 100644
--- a/kernel/time/posix-timers.h
+++ b/kernel/time/posix-timers.h
@@ -6,8 +6,11 @@ struct k_clock {
struct timespec64 *tp);
int (*clock_set)(const clockid_t which_clock,
const struct timespec64 *tp);
+ /* Returns the clock value in the current time namespace. */
int (*clock_get_timespec)(const clockid_t which_clock,
struct timespec64 *tp);
+ /* Returns the clock value in the root time namespace. */
+ ktime_t (*clock_get_ktime)(const clockid_t which_clock);
int (*clock_adj)(const clockid_t which_clock, struct __kernel_timex *tx);
int (*timer_create)(struct k_itimer *timer);
int (*nsleep)(const clockid_t which_clock, int flags,
--
2.22.0
next prev parent reply other threads:[~2019-07-29 22:02 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-29 21:56 [PATCHv5 00/37] kernel: Introduce Time Namespace Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 01/37] ns: " Dmitry Safonov
2019-08-01 5:29 ` Andy Lutomirski
2019-08-01 23:46 ` Dmitry Safonov
2019-08-07 0:24 ` [PATCHv6 " Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 02/37] timens: Add timens_offsets Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 03/37] posix-clocks: Rename the clock_get() into clock_get_timespec() Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 04/37] posix-clocks: Rename *_clock_get() functions into *_clock_get_timespec() Dmitry Safonov
2019-08-07 6:01 ` Thomas Gleixner
2019-07-29 21:56 ` [PATCHv5 05/37] alarmtimer: Rename gettime() callback to get_ktime() Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 06/37] alarmtimer: Provide get_timespec() callback Dmitry Safonov
2019-08-07 6:04 ` Thomas Gleixner
2019-08-08 6:18 ` Andrei Vagin
2019-07-29 21:56 ` Dmitry Safonov [this message]
2019-07-29 21:56 ` [PATCHv5 08/37] posix-timers: Use clock_get_ktime() in common_timer_get() Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 09/37] posix-clocks: Introduce CLOCK_MONOTONIC time namespace offsets Dmitry Safonov
2019-08-07 6:07 ` Thomas Gleixner
2019-07-29 21:56 ` [PATCHv5 10/37] posix-clocks: Introduce CLOCK_BOOTTIME time namespace offset Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 11/37] kernel: Add do_timens_ktime_to_host() helper Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 12/37] timerfd: Make timerfd_settime() time namespace aware Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 13/37] posix-timers: Make timer_settime() " Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 14/37] alarmtimer: Make nanosleep " Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 15/37] hrtimers: Prepare hrtimer_nanosleep() for time namespaces Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 16/37] posix-timers: Make clock_nanosleep() time namespace aware Dmitry Safonov
2019-07-29 21:56 ` [PATCHv5 17/37] fd/proc: Respect boottime inside time namespace for /proc/uptime Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 18/37] x86/vdso2c: Correct err messages on file opening Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 19/37] x86/vdso2c: Convert iterator to unsigned Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 20/37] x86/vdso/Makefile: Add vobjs32 Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 21/37] x86/vdso: Restrict splitting VVAR VMA Dmitry Safonov
2019-08-01 5:23 ` Andy Lutomirski
2019-07-29 21:57 ` [PATCHv5 22/37] x86/vdso: Rename vdso_image {.data=>.text} Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 23/37] x86/vdso: Add offsets page in vvar Dmitry Safonov
2019-08-01 5:22 ` Andy Lutomirski
2019-07-29 21:57 ` [PATCHv5 24/37] x86/vdso: Allocate timens vdso Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 25/37] x86/vdso: Switch image on setns()/clone() Dmitry Safonov
2019-08-01 5:34 ` Andy Lutomirski
2019-08-01 6:09 ` hpa
2019-08-01 21:39 ` Andy Lutomirski
2019-08-07 0:27 ` [PATCHv6 " Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 26/37] vdso: Introduce vdso_static_branch_unlikely() Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 27/37] x86/vdso2c: Process jump tables Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 28/37] x86/vdso: Enable static branches for the timens vdso Dmitry Safonov
2019-08-01 5:21 ` Andy Lutomirski
2019-08-01 6:48 ` Thomas Gleixner
2019-07-29 21:57 ` [PATCHv5 29/37] posix-clocks: Add align for timens_offsets Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 30/37] fs/proc: Introduce /proc/pid/timens_offsets Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 31/37] selftest/timens: Add Time Namespace test for supported clocks Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 32/37] selftest/timens: Add a test for timerfd Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 33/37] selftest/timens: Add a test for clock_nanosleep() Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 34/37] selftest/timens: Add procfs selftest Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 35/37] selftest/timens: Add timer offsets test Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 36/37] selftests/timens: Add a simple perf test for clock_gettime() Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 37/37] selftest/timens: Check that a right vdso is mapped after fork and exec Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 00/37] kernel: Introduce Time Namespace Dmitry Safonov
2019-07-29 22:07 ` Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 01/37] ns: " Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 02/37] timens: Add timens_offsets Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 03/37] posix-clocks: Rename the clock_get() into clock_get_timespec() Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 04/37] posix-clocks: Rename *_clock_get() functions into *_clock_get_timespec() Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 05/37] alarmtimer: Rename gettime() callback to get_ktime() Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 06/37] alarmtimer: Provide get_timespec() callback Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 07/37] posix-clocks: Introduce clock_get_ktime() callback Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 08/37] posix-timers: Use clock_get_ktime() in common_timer_get() Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 09/37] posix-clocks: Introduce CLOCK_MONOTONIC time namespace offsets Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 10/37] posix-clocks: Introduce CLOCK_BOOTTIME time namespace offset Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 11/37] kernel: Add do_timens_ktime_to_host() helper Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 12/37] timerfd: Make timerfd_settime() time namespace aware Dmitry Safonov
2019-07-29 21:57 ` [PATCHv5 13/37] posix-timers: Make timer_settime() " Dmitry Safonov
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