Re: [patch-rt] softirq: Move ksoftirqd_running() under !CONFIG_PREEMPT_RT_FULL

From	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [patch-rt] softirq: Move ksoftirqd_running() under !CONFIG_PREEMPT_RT_FULL
Date	2017-01-20 18:30 +0100
Message-ID	<t1LaG-1Gn-7@gated-at.bofh.it> (permalink)
References	<sRB2V-Pv-3@gated-at.bofh.it> <sUnd8-va-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 2016-12-31 09:20:10 [+0100], Mike Galbraith wrote:
> 
> Otherwise, ktimersoftd may not be awakened when it has work to do.

so the problem is that we have two softirq threads and we only check
the state of the "normal" one even if we would have also the schedule
the second one. 
The approach looks good, applied.

> [   84.087571] NOHZ: local_softirq_pending 02
> [   84.087593] NOHZ: local_softirq_pending 02
> [   84.087598] NOHZ: local_softirq_pending 02
> [   84.087904] NOHZ: local_softirq_pending 02
> [   84.088526] NOHZ: local_softirq_pending 02
> [   84.088899] NOHZ: local_softirq_pending 02
> [   84.089463] NOHZ: local_softirq_pending 02
> [  115.013470] NOHZ: local_softirq_pending 02
> [  115.013601] NOHZ: local_softirq_pending 02
> [  115.013709] NOHZ: local_softirq_pending 02
> 
> Signed-off-by: Mike Galbraith <efault@gmx.de>

Sebastian

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Re: [patch-rt] softirq: Move ksoftirqd_running() under  !CONFIG_PREEMPT_RT_FULL Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2017-01-20 18:30 +0100

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