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

From: Andi Kleen
Date: Wed Jun 18 2014 - 23:38:22 EST


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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