linux-kernel - Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical section?

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Message-ID: <20130906165830.GS3966@linux.vnet.ibm.com>
Date:	Fri, 6 Sep 2013 09:58:31 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...icios.com, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	dhowells@...hat.com, edumazet@...gle.com, darren@...art.com,
	sbw@....edu
Subject: Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical
 section?

On Fri, Sep 06, 2013 at 12:52:38PM -0400, Steven Rostedt wrote:
> On Fri, 6 Sep 2013 18:40:18 +0200
> Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > > I can't use plain preempt_disable() in function tracing.
> > > 
> > > Also, since it's a misnomer to say the cpu is idle in NO_HZ_FULL when
> > > we are coming from userspace, can we rename that?
> > > 
> > > Perhaps we can also have a __rcu_is_cpu_tracking() (or whatever), with
> > > the "__" appended that does not do the preempt disable.
> > 
> > rcu_is_cpu_eqs() is probably better. It refers to other related "eqs" naming
> > in RCU APIs.
> 
> But that will just confuse the heck out of people. When I see "eqs" I
> equate that with "equals". What does the rcu cpu equal?

The acronym eqs "equals" "extended quiescent state".  ;-)

							Thanx, Paul

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