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Date: Tue, 25 Oct 2022 15:58:46 +0200 From: Anna-Maria Behnsen <anna-maria@...utronix.de> To: linux-kernel@...r.kernel.org Cc: Peter Zijlstra <peterz@...radead.org>, John Stultz <john.stultz@...aro.org>, Eric Dumazet <edumazet@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, linux-pm@...r.kernel.org, Arjan van de Ven <arjan@...radead.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Frederic Weisbecker <fweisbec@...il.com>, Rik van Riel <riel@...hat.com>, "Richard Cochran (linutronix GmbH)" <richardcochran@...il.com>, Anna-Maria Behnsen <anna-maria@...utronix.de> Subject: [PATCH v3 13/17] tick/sched: Split out jiffies update helper function From: "Richard Cochran (linutronix GmbH)" <richardcochran@...il.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@...il.com> Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de> --- kernel/time/tick-internal.h | 1 + kernel/time/tick-sched.c | 20 ++++++++++++++++---- 2 files changed, 17 insertions(+), 4 deletions(-) diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h index 7b65abc9d803..8f99e35e75b4 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 7f7bfe8b498d..868679ff3421 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -782,19 +782,31 @@ 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) { - struct timer_events tevt = { .local = KTIME_MAX, .global = KTIME_MAX }; - u64 basemono, 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) +{ + struct timer_events tevt = { .local = KTIME_MAX, .global = KTIME_MAX }; + u64 basemono, delta, expires; + unsigned long basejiff; + + basemono = get_jiffies_update(&basejiff); ts->last_jiffies = basejiff; ts->timer_expires_base = basemono; -- 2.30.2
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