From: Anna-Maria Behnsen <anna-maria@linutronix.de>
To: linux-kernel@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
John Stultz <jstultz@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Eric Dumazet <edumazet@google.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Arjan van de Ven <arjan@infradead.org>,
"Paul E . McKenney" <paulmck@kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Rik van Riel <riel@surriel.com>,
"Richard Cochran (linutronix GmbH)" <richardcochran@gmail.com>,
Anna-Maria Behnsen <anna-maria@linutronix.de>
Subject: [PATCH v5 15/18] tick/sched: Split out jiffies update helper function
Date: Wed, 1 Mar 2023 15:17:41 +0100 [thread overview]
Message-ID: <20230301141744.16063-16-anna-maria@linutronix.de> (raw)
In-Reply-To: <20230301141744.16063-1-anna-maria@linutronix.de>
From: "Richard Cochran (linutronix GmbH)" <richardcochran@gmail.com>
The logic to get the time of the last jiffies update will be needed by
the timer pull model as well.
Move the code into a global funtion in anticipation of the new caller.
No functional change.
Signed-off-by: Richard Cochran (linutronix GmbH) <richardcochran@gmail.com>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
---
kernel/time/tick-internal.h | 1 +
kernel/time/tick-sched.c | 18 +++++++++++++++---
2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 28471c8f8c9c..296cd06bbb24 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -158,6 +158,7 @@ static inline void tick_nohz_init(void) { }
#ifdef CONFIG_NO_HZ_COMMON
extern unsigned long tick_nohz_active;
extern void timers_update_nohz(void);
+extern u64 get_jiffies_update(unsigned long *basej);
# ifdef CONFIG_SMP
extern struct static_key_false timers_migration_enabled;
# endif
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 7ffdc7ba19b4..1075697f2aa8 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -782,18 +782,30 @@ static inline bool local_timer_softirq_pending(void)
return local_softirq_pending() & BIT(TIMER_SOFTIRQ);
}
-static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)
+/*
+ * Read jiffies and the time when jiffies were updated last
+ */
+u64 get_jiffies_update(unsigned long *basej)
{
- u64 basemono, next_tick, delta, expires;
unsigned long basejiff;
unsigned int seq;
+ u64 basemono;
- /* Read jiffies and the time when jiffies were updated last */
do {
seq = read_seqcount_begin(&jiffies_seq);
basemono = last_jiffies_update;
basejiff = jiffies;
} while (read_seqcount_retry(&jiffies_seq, seq));
+ *basej = basejiff;
+ return basemono;
+}
+
+static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)
+{
+ u64 basemono, next_tick, delta, expires;
+ unsigned long basejiff;
+
+ basemono = get_jiffies_update(&basejiff);
ts->last_jiffies = basejiff;
ts->timer_expires_base = basemono;
--
2.30.2
next prev parent reply other threads:[~2023-03-01 14:19 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-01 14:17 [PATCH v5 00/18] timer: Move from a push remote at enqueue to a pull at expiry model Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 01/18] tick-sched: Warn when next tick seems to be in the past Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 02/18] timer: Add comment to get_next_timer_interrupt() description Anna-Maria Behnsen
2023-04-11 9:36 ` Frederic Weisbecker
2023-04-11 16:10 ` Anna-Maria Behnsen
2023-04-12 11:29 ` Frederic Weisbecker
2023-03-01 14:17 ` [PATCH v5 03/18] timer: Move store of next event into __next_timer_interrupt() Anna-Maria Behnsen
2023-03-21 12:48 ` Peter Zijlstra
2023-04-12 11:32 ` Frederic Weisbecker
2023-03-01 14:17 ` [PATCH v5 04/18] timer: Split next timer interrupt logic Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 05/18] timer: Rework idle logic Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 06/18] add_timer_on(): Make sure callers have TIMER_PINNED flag Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 07/18] timers: Ease code in run_local_timers() Anna-Maria Behnsen
2023-04-12 14:32 ` Frederic Weisbecker
2023-03-01 14:17 ` [PATCH v5 08/18] timers: Create helper function to forward timer base clk Anna-Maria Behnsen
2023-04-12 14:40 ` Frederic Weisbecker
2023-03-01 14:17 ` [PATCH v5 09/18] timer: Keep the pinned timers separate from the others Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 10/18] timer: Retrieve next expiry of pinned/non-pinned timers seperately Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 11/18] timer: Split out "get next timer interrupt" functionality Anna-Maria Behnsen
2023-03-09 16:30 ` Frederic Weisbecker
2023-03-09 17:45 ` Frederic Weisbecker
2023-03-21 14:30 ` Peter Zijlstra
2023-04-12 20:34 ` Frederic Weisbecker
2023-03-01 14:17 ` [PATCH v5 12/18] timer: Add get next timer interrupt functionality for remote CPUs Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 13/18] timer: Restructure internal locking Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 14/18] timer: Check if timers base is handled already Anna-Maria Behnsen
2023-03-21 14:43 ` Peter Zijlstra
2023-03-01 14:17 ` Anna-Maria Behnsen [this message]
2023-03-01 14:17 ` [PATCH v5 16/18] timer: Implement the hierarchical pull model Anna-Maria Behnsen
2023-03-14 13:24 ` Frederic Weisbecker
2023-03-14 14:49 ` Anna-Maria Behnsen
2023-03-14 16:01 ` Frederic Weisbecker
2023-03-21 11:17 ` Frederic Weisbecker
2023-04-04 14:05 ` Anna-Maria Behnsen
2023-04-04 14:32 ` Frederic Weisbecker
2023-03-21 13:25 ` Frederic Weisbecker
2023-04-06 9:12 ` Anna-Maria Behnsen
2023-03-21 15:29 ` Peter Zijlstra
2023-03-21 15:34 ` Peter Zijlstra
2023-03-21 15:40 ` Peter Zijlstra
2023-03-23 9:22 ` Peter Zijlstra
2023-03-23 9:34 ` Peter Zijlstra
2023-03-23 9:47 ` Peter Zijlstra
2023-03-23 12:47 ` Peter Zijlstra
2023-03-23 14:24 ` Peter Zijlstra
2023-04-04 14:56 ` Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 17/18] timer_migration: Add tracepoints Anna-Maria Behnsen
2023-03-01 14:17 ` [PATCH v5 18/18] timer: Always queue timers on the local CPU Anna-Maria Behnsen
2023-03-21 12:46 ` [PATCH v5 00/18] timer: Move from a push remote at enqueue to a pull at expiry model Peter Zijlstra
2023-04-04 13:35 ` Anna-Maria Behnsen
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