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Date: Tue, 21 Dec 2010 02:30:21 +0100
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: LKML <linux-kernel@vger.kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
        Lai Jiangshan <laijs@cn.fujitsu.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Anton Blanchard <anton@au1.ibm.com>,
        Tim Pepper <lnxninja@linux.vnet.ibm.com>
Subject: Re: [RFC PATCH 11/15] x86: Nohz task support
Message-ID: <20101221013019.GK1715@nowhere>
References: <1292858662-5650-1-git-send-email-fweisbec@gmail.com>
 <1292858662-5650-12-git-send-email-fweisbec@gmail.com>
 <1292862199.5021.32.camel@laptop>
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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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