linux-kernel - Re: [PATCH tip/core/rcu 14/19] rcu: Extend expedited funnel locking to rcu

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Message-ID: <20150922151051.GL4029@linux.vnet.ibm.com>
Date:	Tue, 22 Sep 2015 08:10:51 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 14/19] rcu: Extend expedited funnel locking
 to rcu_data structure

On Mon, Sep 21, 2015 at 06:04:50PM -0400, Sasha Levin wrote:
> On 09/21/2015 12:12 AM, Paul E. McKenney wrote:
> > Hmmm...  I created rdp->exp_funnel_mutex, but failed to give RCU-sched
> > its own lock class.  Does the following untested patch fix things for you?
> 
> Haven't reproduced yet, but it didn't happen that often before - let's give it
> another day or two of testing?

Fair enough!

I didn't see it in my testing, but later patches eliminate this
locking situation entirely, so I didn't put that much time into it.

							Thanx, Paul

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