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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-02 11:49:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-02 11:49:41 -0700
commit46e0d28bdb8e6d00e27a0fe9e1d15df6098f0ffb (patch)
treed5cb66fbd85b3d5c3220aacd2d9a60f9a515903a /kernel/time/tick-sched.c
parent86bbbebac1933e6e95e8234c4f7d220c5ddd38bc (diff)
parentb720342849fe685310fca01748a32730a6eca5aa (diff)
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler updates from Ingo Molnar: "The main scheduler changes in this cycle were: - NUMA balancing improvements (Mel Gorman) - Further load tracking improvements (Patrick Bellasi) - Various NOHZ balancing cleanups and optimizations (Peter Zijlstra) - Improve blocked load handling, in particular we can now reduce and eventually stop periodic load updates on 'very idle' CPUs. (Vincent Guittot) - On isolated CPUs offload the final 1Hz scheduler tick as well, plus related cleanups and reorganization. (Frederic Weisbecker) - Core scheduler code cleanups (Ingo Molnar)" * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (45 commits) sched/core: Update preempt_notifier_key to modern API sched/cpufreq: Rate limits for SCHED_DEADLINE sched/fair: Update util_est only on util_avg updates sched/cpufreq/schedutil: Use util_est for OPP selection sched/fair: Use util_est in LB and WU paths sched/fair: Add util_est on top of PELT sched/core: Remove TASK_ALL sched/completions: Use bool in try_wait_for_completion() sched/fair: Update blocked load when newly idle sched/fair: Move idle_balance() sched/nohz: Merge CONFIG_NO_HZ_COMMON blocks sched/fair: Move rebalance_domains() sched/nohz: Optimize nohz_idle_balance() sched/fair: Reduce the periodic update duration sched/nohz: Stop NOHZ stats when decayed sched/cpufreq: Provide migration hint sched/nohz: Clean up nohz enter/exit sched/fair: Update blocked load from NEWIDLE sched/fair: Add NOHZ stats balancing sched/fair: Restructure nohz_balance_kick() ...
Diffstat (limited to 'kernel/time/tick-sched.c')
-rw-r--r--kernel/time/tick-sched.c22
1 files changed, 8 insertions, 14 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index ccd3782da0bf..5d4a0342f934 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -463,11 +463,18 @@ static int __init setup_tick_nohz(char *str)
__setup("nohz=", setup_tick_nohz);
-int tick_nohz_tick_stopped(void)
+bool tick_nohz_tick_stopped(void)
{
return __this_cpu_read(tick_cpu_sched.tick_stopped);
}
+bool tick_nohz_tick_stopped_cpu(int cpu)
+{
+ struct tick_sched *ts = per_cpu_ptr(&tick_cpu_sched, cpu);
+
+ return ts->tick_stopped;
+}
+
/**
* tick_nohz_update_jiffies - update jiffies when idle was interrupted
*
@@ -723,12 +730,6 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
delta = KTIME_MAX;
}
-#ifdef CONFIG_NO_HZ_FULL
- /* Limit the tick delta to the maximum scheduler deferment */
- if (!ts->inidle)
- delta = min(delta, scheduler_tick_max_deferment());
-#endif
-
/* Calculate the next expiry time */
if (delta < (KTIME_MAX - basemono))
expires = basemono + delta;
@@ -935,13 +936,6 @@ void tick_nohz_idle_enter(void)
struct tick_sched *ts;
lockdep_assert_irqs_enabled();
- /*
- * Update the idle state in the scheduler domain hierarchy
- * when tick_nohz_stop_sched_tick() is called from the idle loop.
- * State will be updated to busy during the first busy tick after
- * exiting idle.
- */
- set_cpu_sd_state_idle();
local_irq_disable();