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author | Ingo Molnar <mingo@kernel.org> | 2016-07-07 08:35:28 (GMT) |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-07-07 08:35:28 (GMT) |
commit | 4b4b20852d1009c5e8bc357b22353b62e3a241c7 (patch) | |
tree | 1026418471fe10c5b9f2fdff8a6b49bf070938fc /kernel/time/tick-sched.c | |
parent | 5130213721d01b6632c255d4295a8102cbb58379 (diff) | |
parent | f00c0afdfa625165a609513bc74164d56752ec3e (diff) | |
download | linux-4b4b20852d1009c5e8bc357b22353b62e3a241c7.tar.xz |
Merge branch 'timers/fast-wheel' into timers/core
Diffstat (limited to 'kernel/time/tick-sched.c')
-rw-r--r-- | kernel/time/tick-sched.c | 45 |
1 files changed, 13 insertions, 32 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index db57d1b..2ec7c00 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -700,6 +700,12 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, delta = next_tick - basemono; if (delta <= (u64)TICK_NSEC) { tick.tv64 = 0; + + /* + * Tell the timer code that the base is not idle, i.e. undo + * the effect of get_next_timer_interrupt(): + */ + timer_clear_idle(); /* * We've not stopped the tick yet, and there's a timer in the * next period, so no point in stopping it either, bail. @@ -809,6 +815,12 @@ static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now) tick_do_update_jiffies64(now); cpu_load_update_nohz_stop(); + /* + * Clear the timer idle flag, so we avoid IPIs on remote queueing and + * the clock forward checks in the enqueue path: + */ + timer_clear_idle(); + calc_load_exit_idle(); touch_softlockup_watchdog_sched(); /* @@ -1092,35 +1104,6 @@ static void tick_nohz_switch_to_nohz(void) tick_nohz_activate(ts, NOHZ_MODE_LOWRES); } -/* - * When NOHZ is enabled and the tick is stopped, we need to kick the - * tick timer from irq_enter() so that the jiffies update is kept - * alive during long running softirqs. That's ugly as hell, but - * correctness is key even if we need to fix the offending softirq in - * the first place. - * - * Note, this is different to tick_nohz_restart. We just kick the - * timer and do not touch the other magic bits which need to be done - * when idle is left. - */ -static void tick_nohz_kick_tick(struct tick_sched *ts, ktime_t now) -{ -#if 0 - /* Switch back to 2.6.27 behaviour */ - ktime_t delta; - - /* - * Do not touch the tick device, when the next expiry is either - * already reached or less/equal than the tick period. - */ - delta = ktime_sub(hrtimer_get_expires(&ts->sched_timer), now); - if (delta.tv64 <= tick_period.tv64) - return; - - tick_nohz_restart(ts, now); -#endif -} - static inline void tick_nohz_irq_enter(void) { struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched); @@ -1131,10 +1114,8 @@ static inline void tick_nohz_irq_enter(void) now = ktime_get(); if (ts->idle_active) tick_nohz_stop_idle(ts, now); - if (ts->tick_stopped) { + if (ts->tick_stopped) tick_nohz_update_jiffies(now); - tick_nohz_kick_tick(ts, now); - } } #else |