linux-kernel - Re: [PATCH 0/5] cpusets: dynamical scheduler domain flags

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Date:	Mon, 23 Jul 2012 06:28:03 +0200
From:	Mike Galbraith <efault@....de>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, mingo@...hat.com,
	paul@...lmenage.org
Subject: Re: [PATCH 0/5] cpusets: dynamical scheduler domain flags

On Mon, 2012-07-23 at 10:30 +0800, Michael Wang wrote: 
> On 07/21/2012 12:42 AM, Peter Zijlstra wrote:
> > On Tue, 2012-07-17 at 17:03 +0800, Michael Wang wrote:
> >> This patch set provide a way for user to dynamically configure the scheduler
> >> domain flags, which usually to be static. 
> > 
> > NAK.. you don't get to expose all this nonsense in a 'stable' ABI.
> > 
> > You shouldn't need to prod at them to begin with.
> 
> So is that means expose those domain flags to user is a bad idea at all?

You can set/clear flags with scripts now, ie domain flags are already
exposed.. as defined by the running kernel.

SD_SHARE_PKG_RESOURCES is a good flag look at.  What does flipping that
switch do, and what did it stop doing recently?  So yeah, methinks
exporting flags via cpusets is a bad idea.  Not only is existence of any
particular flag volatile, functionality behind it is volatile as well,
so having a button to poke does undefined things.  (not to mention
non-exclusive sets)

-Mike

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