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Message-ID: <20120614144734.GA2458@linux.vnet.ibm.com>
Date: Thu, 14 Jun 2012 07:47:34 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Peter Zijlstra <peterz@...radead.org>
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, Jun 14, 2012 at 03:01:27PM +0200, Peter Zijlstra wrote:
> On Thu, 2012-06-14 at 05:59 -0700, Paul E. McKenney wrote:
> > Yep, starvation.
>
> What's the particular starvation case?
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.
Thanx, Paul
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