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Subject[PATCH V1] nohz: exit nohz idle before invoking softirq
Date
From: "shiyan.csy" <shiyan.csy@alibaba-inc.com>

exit nohz idle before invoking softirq, or it maymiss
some ticks during softirq.

Signed-off-by: Shiyan Chen <chenshiyan@linux.alibaba.com>
---
kernel/softirq.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 9d71046..59bd6fe 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -404,6 +404,10 @@ static inline void tick_irq_exit(void)
if (!in_irq())
tick_nohz_irq_exit();
}
+
+ /* need to exit nohz idle if there's a softirq */
+ if (in_serving_softirq() || local_softirq_pending())
+ tick_nohz_idle_exit();
#endif
}

@@ -416,10 +420,11 @@ static inline void __irq_exit_rcu(void)
#endif
account_hardirq_exit(current);
preempt_count_sub(HARDIRQ_OFFSET);
- if (!in_interrupt() && local_softirq_pending())
- invoke_softirq();

+ /* must call before invoke_softirq */
tick_irq_exit();
+ if (!in_interrupt() && local_softirq_pending())
+ invoke_softirq();
}

/**
--
1.8.3.1
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