linux-kernel - Re: [bisected] pre-3.16 regression on open() scalability

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Message-ID: <20140619033816.GQ8178@tassilo.jf.intel.com>
Date:	Wed, 18 Jun 2014 20:38:16 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Josh Triplett <josh@...htriplett.org>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [bisected] pre-3.16 regression on open() scalability

On Wed, Jun 18, 2014 at 07:13:37PM -0700, Paul E. McKenney wrote:
> On Wed, Jun 18, 2014 at 06:42:00PM -0700, Andi Kleen wrote:
> > 
> > I still think it's totally the wrong direction to pollute so 
> > many fast paths with this obscure debugging check workaround
> > unconditionally.
> 
> OOM prevention should count for something, I would hope.

OOM in what scenario? This is getting bizarre.

If something keeps looping forever in the kernel creating 
RCU callbacks without any real quiescent states it's simply broken.

-Andi
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