linux-kernel - Re: [patch -mm] cpusets: add memory_slab

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Message-Id: <20090310102926.A47E.A69D9226@jp.fujitsu.com>
Date:	Tue, 10 Mar 2009 10:35:38 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>,
	Paul Menage <menage@...gle.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch -mm] cpusets: add memory_slab_hardwall flag

> On Mon, 9 Mar 2009, Christoph Lameter wrote:
> 
> > Again these are fastpath modifications.
> > 
> 
> The nature of the change requires the logic to be placed in the fastpath 
> to determine whether a cpu slab's node is allowed by the allocating task's 
> cpuset.
> 
> You have previously stated that you would prefer that this feature be 
> tunable from userspace.  This patch adds the `memory_slab_hardwall' cpuset 
> flag which defaults to off.

That's pointless.
Again, any fastpath modification should have reasonable reason.
We are looking for your explanation.

I have each 6+ year experience on embedded, HPC, and high-end server area.
but I haven't hear this requirement. I still can't imazine who use this feature.



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