Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH 20/33] nohz: Move nohz load balancer selection into idle logic | Date | Tue, 8 Jan 2013 03:08:20 +0100 |
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[ ** BUGGY PATCH: I need to put more thinking into this ** ]
We want the nohz load balancer to be an idle CPU, thus move that selection to strict dyntick idle logic.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Alessio Igor Bogani <abogani@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Christoph Lameter <cl@linux.com> Cc: Geoff Levand <geoff@infradead.org> Cc: Gilad Ben Yossef <gilad@benyossef.com> Cc: Hakan Akkan <hakanakkan@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> [ added movement of calc_load_exit_idle() ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- kernel/time/tick-sched.c | 11 ++++++----- 1 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index a35ae96..5cefed8 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -444,9 +444,6 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, * the scheduler tick in nohz_restart_sched_tick. */ if (!ts->tick_stopped) { - nohz_balance_enter_idle(cpu); - calc_load_enter_idle(); - ts->last_tick = hrtimer_get_expires(&ts->sched_timer); ts->tick_stopped = 1; } @@ -542,8 +539,11 @@ static void __tick_nohz_idle_enter(struct tick_sched *ts) ts->idle_expires = expires; } - if (!was_stopped && ts->tick_stopped) + if (!was_stopped && ts->tick_stopped) { ts->idle_jiffies = ts->last_jiffies; + nohz_balance_enter_idle(cpu); + calc_load_enter_idle(); + } } } @@ -651,7 +651,6 @@ static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now) tick_do_update_jiffies64(now); update_cpu_load_nohz(); - calc_load_exit_idle(); touch_softlockup_watchdog(); /* * Cancel the scheduled timer and restore the tick @@ -711,6 +710,8 @@ void tick_nohz_idle_exit(void) tick_nohz_stop_idle(cpu, now); if (ts->tick_stopped) { + nohz_balance_enter_idle(cpu); + calc_load_exit_idle(); tick_nohz_restart_sched_tick(ts, now); tick_nohz_account_idle_ticks(ts); } -- 1.7.5.4
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