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Date:	Tue, 7 Oct 2014 13:45:28 -0400
From:	Joe Lawrence <>
To:	<>
CC:	Jiri Pirko <>, Tejun Heo <>,
	<>, <>
Subject: Re: [PATCH v2 1/2] workqueue: add quiescent state between work

On Tue, 7 Oct 2014 06:43:29 -0700
"Paul E. McKenney" <> wrote:

> On Tue, Oct 07, 2014 at 09:29:42AM +0200, Jiri Pirko wrote:
[ ... snip ... ]
> > 
> > Paul, Tehun, how do you propose to fix this on older kernels which do
> > not have rcu_note_voluntary_context_switch? I'm particullary interested
> > in 3.10.
> Hello, Jiri,
> Older kernels can instead use rcu_note_context_switch().

Hi Paul,

Does 4a81e8328d37 ("rcu: Reduce overhead of cond_resched() checks for
RCU") affect a backport to 3.10?

I noticed that rcu_note_context_switch added a call to
rcu_momentary_dyntick_idle in that change, which is only present in

Would rcu_note_context_switch be effective by itself on a 3.10 kernel?


-- Joe
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