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tick/sched: Reduce seqcount held scope in tick_do_update_jiffies64()

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[ Upstream commit 94ad2e3ced ]

If jiffies are up to date already (caller lost the race against another
CPU) there is no point to change the sequence count. Doing that just forces
other CPUs into the seqcount retry loop in tick_nohz_next_event() for
nothing.

Just bail out early.

[ tglx: Rewrote most of it ]

Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201117132006.462195901@linutronix.de
Stable-dep-of: e9523a0d8189 ("tick/common: Align tick period with the HZ tick.")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yunfeng Ye
2020-11-17 14:19:46 +01:00
committed by Greg Kroah-Hartman
parent ca721584e9
commit 93c4300836
1 changed files with 26 additions and 29 deletions
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55
kernel/time/tick-sched.c
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@@ -84,38 +84,35 @@ static void tick_do_update_jiffies64(ktime_t now)
/* Reevaluate with jiffies_lock held */
raw_spin_lock(&jiffies_lock);
write_seqcount_begin(&jiffies_seq);
delta = ktime_sub(now, last_jiffies_update);
if (delta >= tick_period) {
delta = ktime_sub(delta, tick_period);
last_jiffies_update = ktime_add(last_jiffies_update,
tick_period);
/* Slow path for long timeouts */
if (unlikely(delta >= tick_period)) {
s64 incr = ktime_to_ns(tick_period);
ticks = ktime_divns(delta, incr);
last_jiffies_update = ktime_add_ns(last_jiffies_update,
incr * ticks);
}
do_timer(++ticks);
/*
* Keep the tick_next_period variable up to date.
* WRITE_ONCE() pairs with the READ_ONCE() in the lockless
* quick check above.
*/
WRITE_ONCE(tick_next_period,
ktime_add(last_jiffies_update, tick_period));
} else {
write_seqcount_end(&jiffies_seq);
if (ktime_before(now, tick_next_period)) {
raw_spin_unlock(&jiffies_lock);
return;
}
write_seqcount_begin(&jiffies_seq);
last_jiffies_update = ktime_add(last_jiffies_update, tick_period);
delta = ktime_sub(now, tick_next_period);
if (unlikely(delta >= tick_period)) {
/* Slow path for long idle sleep times */
s64 incr = ktime_to_ns(tick_period);
ticks = ktime_divns(delta, incr);
last_jiffies_update = ktime_add_ns(last_jiffies_update,
incr * ticks);
}
do_timer(++ticks);
/*
* Keep the tick_next_period variable up to date. WRITE_ONCE()
* pairs with the READ_ONCE() in the lockless quick check above.
*/
WRITE_ONCE(tick_next_period,
ktime_add(last_jiffies_update, tick_period));
write_seqcount_end(&jiffies_seq);
raw_spin_unlock(&jiffies_lock);
update_wall_time();