linux-kernel - Re: [PATCH 1/2 v2] sched: fix find_idlest

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Message-ID: <20161129123023.GI3092@twins.programming.kicks-ass.net>
Date:   Tue, 29 Nov 2016 13:30:23 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Matt Fleming <matt@...eblueprint.co.uk>
Cc:     Morten Rasmussen <morten.rasmussen@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>, mingo@...nel.org,
        linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        kernellwp@...il.com, yuyang.du@...el.com, umgwanakikbuti@...il.com
Subject: Re: [PATCH 1/2 v2] sched: fix find_idlest_group for fork

On Tue, Nov 29, 2016 at 11:44:19AM +0000, Matt Fleming wrote:
> On Tue, 29 Nov, at 12:42:43PM, Peter Zijlstra wrote:
> > 
> > IIRC, and my pounding head really doesn't remember much, the comment
> > reads like we need the large fudge factor because hackbench. That is,
> > hackbench would like this test to go away, but others benchmarks will
> > tank.
> > 
> > Now, if only I would've written down which benchmarks that were.. awell.
>  
> Going out on a limb: Chris' schbench?

No, that actually wants that test taken out as well. It might have been
things like sysbench or so.