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

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Message-ID: <alpine.DEB.2.11.1406191531020.4002@gentwo.org>
Date:	Thu, 19 Jun 2014 15:31:56 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Andi Kleen <ak@...ux.intel.com>,
	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>
Subject: Re: [bisected] pre-3.16 regression on open() scalability

On Thu, 19 Jun 2014, Paul E. McKenney wrote:

> That is a separate issue, but unnecessary calls to cond_resched()
> should of course be removed -- no argument there.

It looks like we are fighting higher latencies by adding calls in most of
the critical sections which will in turn increase the latencies that we
are trying to reduce.

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