linux-kernel - Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads

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Message-ID: <1339685789.2559.37.camel@twins>
Date:	Thu, 14 Jun 2012 16:56:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu
 hotplug threads

On Thu, 2012-06-14 at 07:47 -0700, Paul E. McKenney wrote:
> RCU callback processing consumes the entire CPU in RCU_BOOST case where
> processing runs at real-time priority.  This is analogous to RT throttling
> in the scheduler. 

But previously we can in non-preemptible softirq context, why would if
behave differently when done from a RT task?

Also, no its not quite like the throttling, that really idles the cpu
even if there's no SCHED_OTHER tasks to run.
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