linux-kernel - Re: [PATCH rcu/urgent 0/6] Fixes for RCU/scheduler/irq-threads trainwreck

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Date:	Wed, 20 Jul 2011 20:52:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ben Greear <greearb@...delatech.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ed Tomlinson <edt@....ca>, linux-kernel@...r.kernel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, patches@...aro.org,
	edward.tomlinson@...o.bombardier.com
Subject: Re: [PATCH rcu/urgent 0/6] Fixes for RCU/scheduler/irq-threads
 trainwreck

On Wed, 2011-07-20 at 20:44 +0200, Ingo Molnar wrote:
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > RCU boost is new and counts as strange for another few days at least.
> 
> I'd rather prefer a oneliner patch that turns it off in the Kconfig 
> for now.
> 
> We are awfully late in the -rc cycle and this diffstat:
> 
>  b/include/linux/sched.h   |    3 ++
>  b/kernel/rcutree_plugin.h |    6 +++--
>  b/kernel/sched.c          |   44 ++++++++++++++++++++++++++++++++++-----
>  b/kernel/signal.c         |   19 +++++++++++------
>  b/kernel/softirq.c        |   12 +++++++++-
>  kernel/rcutree_plugin.h   |   51 +++++++++++++++++++++++++++++++++-------------
>  6 files changed, 105 insertions(+), 30 deletions(-)
> 
> looks very scary to me.

A lot of that is also relevant to !BOOST.
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