linux-kernel - Re: [PATCH 21/31] sched, numa, mm: Introduce sched_feat

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Date:	Thu, 1 Nov 2012 14:00:28 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 21/31] sched, numa, mm: Introduce sched_feat_numa()

On Thu, Oct 25, 2012 at 02:16:38PM +0200, Peter Zijlstra wrote:
> Avoid a few #ifdef's later on.
> 

It does mean that schednuma cannot be enabled or disabled from the command
line (or similarly easy mechanism) and that debugfs must be mounted to
control it. This would be awkward from an admin perspective if they wanted
to force disable schednuma because it hurt their workload for whatever
reason. Yes, they can disable it with an init script of some sort but
there will be some moaning.

-- 
Mel Gorman
SUSE Labs
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