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Revert "nohz: Fix collision between tick and other hrtimers"

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This reverts commit 24b91e360e and commit
7bdb59f1ad ("tick/nohz: Fix possible missing clock reprog after tick
soft restart") that depends on it,

Pavel reports that it causes occasional boot hangs for him that seem to
depend on just how the machine was booted.  In particular, his machine
hangs at around the PCI fixups of the EHCI USB host controller, but only
hangs from cold boot, not from a warm boot.

Thomas Gleixner suspecs it's a CPU hotplug interaction, particularly
since Pavel also saw suspend/resume issues that seem to be related.
We're reverting for now while trying to figure out the root cause.

Reported-bisected-and-tested-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@kernel.org  # reverted commits were marked for stable
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2017-02-16 12:19:18 -08:00
parent 4695daefba
commit 558e8e27e7
2 changed files with 2 additions and 14 deletions
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14
kernel/time/tick-sched.c
View file

@ -725,11 +725,6 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
*/
if (delta == 0) {
tick_nohz_restart(ts, now);
/*
* Make sure next tick stop doesn't get fooled by past
* clock deadline
*/
ts->next_tick = 0;
goto out;
}
}
@ -772,7 +767,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
tick = expires;
/* Skip reprogram of event if its not changed */
if (ts->tick_stopped && (expires == ts->next_tick))
if (ts->tick_stopped && (expires == dev->next_event))
goto out;
/*
@ -792,8 +787,6 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
trace_tick_stop(1, TICK_DEP_MASK_NONE);
}
ts->next_tick = tick;
/*
* If the expiration time == KTIME_MAX, then we simply stop
* the tick timer.
@ -809,10 +802,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
else
tick_program_event(tick, 1);
out:
/*
* Update the estimated sleep length until the next timer
* (not only the tick).
*/
/* Update the estimated sleep length */
ts->sleep_length = ktime_sub(dev->next_event, now);
return tick;
}

2
kernel/time/tick-sched.h
View file

@ -27,7 +27,6 @@ enum tick_nohz_mode {
* timer is modified for nohz sleeps. This is necessary
* to resume the tick timer operation in the timeline
* when the CPU returns from nohz sleep.
* @next_tick: Next tick to be fired when in dynticks mode.
* @tick_stopped: Indicator that the idle tick has been stopped
* @idle_jiffies: jiffies at the entry to idle for idle time accounting
* @idle_calls: Total number of idle calls
@ -45,7 +44,6 @@ struct tick_sched {
unsigned long check_clocks;
enum tick_nohz_mode nohz_mode;
ktime_t last_tick;
ktime_t next_tick;
int inidle;
int tick_stopped;
unsigned long idle_jiffies;