Messages in this thread Patch in this message | | | From | Levi Yun <> | Subject | [PATCH v3] time/tick-sched: idle load balancing when nohz_full cpu becomes idle. | Date | Wed, 8 May 2024 20:22:13 +0100 |
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When nohz_full CPU stops tick in tick_nohz_irq_exit(), It wouldn't be chosen to perform idle load balancing because it doesn't call nohz_balance_enter_idle() in tick_nohz_idle_stop_tick() when it becomes idle.
tick_nohz_idle_stop_tick() is only called in idle state and nohz_balance_enter_idle() tracks the CPU which is part of nohz.idle_cpus_mask with rq->nohz_tick_stopped.
Change tick_nohz_idle_stop_tick() to call nohz_balance_enter_idle() without checking !was_stopped so that nohz_full cpu can be chosen to perform idle load balancing when it enters idle state.
Signed-off-by: Levi Yun <ppbuk5246@gmail.com> --- v3: - Rewording commit message.
v2: - Fix typos in commit message.
kernel/time/tick-sched.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 71a792cd8936..31a4cd89782f 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -1228,8 +1228,10 @@ void tick_nohz_idle_stop_tick(void) ts->idle_sleeps++; ts->idle_expires = expires;
- if (!was_stopped && tick_sched_flag_test(ts, TS_FLAG_STOPPED)) { - ts->idle_jiffies = ts->last_jiffies; + if (tick_sched_flag_test(ts, TS_FLAG_STOPPED)) { + if (!was_stopped) + ts->idle_jiffies = ts->last_jiffies; + nohz_balance_enter_idle(cpu); } } else { -- 2.41.0
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