linux-kernel - Re: Missing recalculation of scheduler tunables in case of cpu hot add/remove

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Message-ID: <1259252545.31676.210.camel@laptop>
Date:	Thu, 26 Nov 2009 17:22:25 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Holger.Wolf@...ibm.com, epasch@...ibm.com
Subject: Re: Missing recalculation of scheduler tunables in case of cpu hot
 add/remove

On Thu, 2009-11-26 at 17:10 +0100, Christian Ehrhardt wrote:
> We might store the corresponding 1cpu values in hidden variables and 
> rescale the effective ones on every cpu add/remove.
> Additionally there would be the need for some logic to update the 
> corresponding 1cpu values every time a user sets new values via the proc 
> interface. 

If you're going to do something like that, setting it based on the
number of cpus in the root_domain might be a better solution.

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