From: Denis Plotnikov <dplotnikov@virtuozzo.com>
To: pbonzini@redhat.com, rkrcmar@redhat.com, kvm@vger.kernel.org,
john.stultz@linaro.org, tglx@linutronix.de
Cc: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org,
x86@kernel.org, rkagan@virtuozzo.com, den@virtuozzo.com
Subject: [PATCH v5 2/6] timekeeper: introduce boot field in system_time_snapshot
Date: Wed, 30 Aug 2017 18:23:44 +0300 [thread overview]
Message-ID: <1504106628-172372-3-git-send-email-dplotnikov@virtuozzo.com> (raw)
In-Reply-To: <1504106628-172372-1-git-send-email-dplotnikov@virtuozzo.com>
The field keeps monotonic time since boot.
The value of boot will be used in KVM for masterclock.
This is a part of the work aiming to move to a more simple scheme
of masterclock related values calculation in KVM
Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
---
include/linux/timekeeping.h | 2 ++
kernel/time/timekeeping.c | 4 ++++
2 files changed, 6 insertions(+)
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index ddc229f..5008e3e 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -283,6 +283,7 @@ extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw,
* @cycles: Clocksource counter value to produce the system times
* @real: Realtime system time
* @raw: Monotonic raw system time
+ * @boot: Monotonic time since boot
* @clock_was_set_seq: The sequence number of clock was set events
* @cs_was_changed_seq: The sequence number of clocksource change events
*/
@@ -290,6 +291,7 @@ struct system_time_snapshot {
u64 cycles;
ktime_t real;
ktime_t raw;
+ ktime_t boot;
unsigned int clock_was_set_seq;
u8 cs_was_changed_seq;
};
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index cedafa0..66f7701 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -953,6 +953,7 @@ void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot)
unsigned long seq;
ktime_t base_raw;
ktime_t base_real;
+ ktime_t base_boot;
u64 nsec_raw;
u64 nsec_real;
u64 now;
@@ -967,6 +968,8 @@ void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot)
base_real = ktime_add(tk->tkr_mono.base,
tk_core.timekeeper.offs_real);
base_raw = tk->tkr_raw.base;
+ base_boot = ktime_add(tk->tkr_mono.base,
+ tk_core.timekeeper.offs_boot);
nsec_real = timekeeping_cycles_to_ns(&tk->tkr_mono, now);
nsec_raw = timekeeping_cycles_to_ns(&tk->tkr_raw, now);
} while (read_seqcount_retry(&tk_core.seq, seq));
@@ -974,6 +977,7 @@ void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot)
systime_snapshot->cycles = now;
systime_snapshot->real = ktime_add_ns(base_real, nsec_real);
systime_snapshot->raw = ktime_add_ns(base_raw, nsec_raw);
+ systime_snapshot->boot = ktime_add_ns(base_boot, nsec_real);
}
EXPORT_SYMBOL_GPL(ktime_get_snapshot);
--
2.7.4
next prev parent reply other threads:[~2017-08-30 15:25 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-30 15:23 [PATCH v5 0/6] KVM: x86: get rid of pvclock_gtod_copy Denis Plotnikov
2017-08-30 15:23 ` [PATCH v5 1/6] timekeeper: introduce extended clocksource reading callback Denis Plotnikov
2017-09-25 22:00 ` Thomas Gleixner
2017-09-26 16:51 ` Paolo Bonzini
2017-09-27 8:52 ` Thomas Gleixner
2017-09-27 10:43 ` Paolo Bonzini
2017-09-27 11:53 ` Thomas Gleixner
2017-09-27 12:14 ` Paolo Bonzini
2017-09-27 13:45 ` Thomas Gleixner
2017-09-27 9:18 ` Thomas Gleixner
2017-08-30 15:23 ` Denis Plotnikov [this message]
2017-08-30 15:23 ` [PATCH v5 3/6] timekeeper: use the extended reading function on snapshot acquiring Denis Plotnikov
2017-08-30 15:23 ` [PATCH v5 4/6] tsc: implement the extended tsc reading function Denis Plotnikov
2017-08-30 15:23 ` [PATCH v5 5/6] KVM: x86: switch to masterclock update using timekeeper functionality Denis Plotnikov
2017-08-30 15:23 ` [PATCH v5 6/6] KVM: x86: remove not used pvclock_gtod_copy Denis Plotnikov
2017-09-11 9:24 ` [PATCH v5 0/6] KVM: x86: get rid of pvclock_gtod_copy Denis Plotnikov
2017-09-18 7:35 ` Thomas Gleixner
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