Message-ID: <1374582790.30532.75.camel@marge.simpson.net>
Subject: Re: [RFC PATCH v2] sched: Limit idle_balance()
From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
        Jason Low <jason.low2@hp.com>, Ingo Molnar <mingo@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Paul Turner <pjt@google.com>,
        Alex Shi <alex.shi@intel.com>,
        Preeti U Murthy <preeti@linux.vnet.ibm.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>, Mel Gorman <mgorman@suse.de>,
        Rik van Riel <riel@redhat.com>, aswin@hp.com, scott.norton@hp.com,
        chegu_vinod@hp.com
Date: Tue, 23 Jul 2013 14:33:10 +0200
In-Reply-To: <20130723120501.GY27075@twins.programming.kicks-ass.net>
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On Tue, 2013-07-23 at 14:05 +0200, Peter Zijlstra wrote: 
> On Tue, Jul 23, 2013 at 04:36:46PM +0530, Srikar Dronamraju wrote:
> 
> > May be the current max value is a limiting factor, but I think there
> > should be a limit to the maximum value. Peter and Ingo may help us
> > understand why they limited to the 1ms. But I dont think we should
> > introduce a new variable just for this.
> 
> /me blames it all on Mike.. I tried to remember why he did that, but
> alas.

Only to accelerate cutoff after long idle.

-Mike

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