linux-kernel - Re: [RFC PATCH 11/15] x86: Nohz task support

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Date:	Tue, 21 Dec 2010 02:30:21 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 11/15] x86: Nohz task support

On Mon, Dec 20, 2010 at 05:23:19PM +0100, Peter Zijlstra wrote:
> On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
> > 
> > Implement the thread flag, syscalls and exception hooks for
> > nohz task support.
> > 
> 
> I saw:
>  - syscall
>  - do_int3
>  - do_debug (int1)
>  - #PF
> 
> So where's all other interrupts?

No need to handle them.

We have:

rcu_irq_enter() rcu_irq_exit() rcu_nmi_enter() rcu_nmi_exit()
and they already act as pauses into extended quiescent states, which
is enough for our needs.
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