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Message-ID: <20140619205044.GX8178@tassilo.jf.intel.com> Date: Thu, 19 Jun 2014 13:50:44 -0700 From: Andi Kleen <ak@...ux.intel.com> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: Christoph Lameter <cl@...two.org>, 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, Jun 19, 2014 at 01:42:20PM -0700, Paul E. McKenney wrote: > On Thu, Jun 19, 2014 at 03:31:56PM -0500, Christoph Lameter wrote: > > 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. > > That is on battle in a larger war. Another battle is to keep big systems > from choking and dying. We need to win both battles, though I understand If we really need cond_resched() now to stop systems from dying we did a really poor job at designing Linux. I hope it's not true, that would be really bad and point to some severe design problems elsewhere. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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