linux-kernel - Re: [PATCH RFC] softirq: fix ksoftirq starved

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Message-ID: <20090617145333.GD6846@elte.hu>
Date:	Wed, 17 Jun 2009 16:53:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Zhaolei <zhaolei@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	Li Zefan <lizf@...fujitsu.com>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RFC] softirq: fix ksoftirq starved


* Lai Jiangshan <laijs@...fujitsu.com> wrote:

> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -5307,6 +5307,7 @@ need_resched:
>  	release_kernel_lock(prev);
>  need_resched_nonpreemptible:
>  
> +	schedule_softirq_check();
>  	schedule_debug(prev);

hm, this slows down the scheduler fast-path ...

	Ingo
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