linux-kernel - Re: [PATCH 0/5] make slab gfp fair

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Message-ID: <Pine.LNX.4.64.0705171059340.18085@schroedinger.engr.sgi.com>
Date:	Thu, 17 May 2007 11:01:01 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Thomas Graf <tgraf@...g.ch>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Phillips <phillips@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 0/5] make slab gfp fair

On Thu, 17 May 2007, Peter Zijlstra wrote:

> > > Its about ensuring ALLOC_NO_WATERMARKS memory only reaches PF_MEMALLOC
> > > processes, not joe random's pi calculator.
> > 
> > Watermarks are per zone?
> 
> Yes, but the page allocator might address multiple zones in order to
> obtain a page.

And then again it may not because the allocation is contrained to a 
particular node,a NORMAL zone or a DMA zone. One zone way be below the 
watermark and another may not. Different allocations may be allowed to 
tap into various zones for various reasons.

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