linux-kernel - Re: [PATCH 00/10] foundations for reserve-based allocation

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Message-ID: <Pine.LNX.4.64.0708061052160.24256@schroedinger.engr.sgi.com>
Date:	Mon, 6 Aug 2007 10:56:13 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Phillips <phillips@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Steve Dickson <SteveD@...hat.com>
Subject: Re: [PATCH 00/10] foundations for reserve-based allocation

On Mon, 6 Aug 2007, Peter Zijlstra wrote:

> We want a guarantee for N bytes from kmalloc(), this translates to a demand
> on the slab allocator for 2*N+m (due to the power-of-two nature of kmalloc 
> slabs), where m is the meta-data needed by the allocator itself.

The guarantee occurs in what context? Looks like its global here but 
allocations may be restricted to a cpuset context? What happens in a 
GFP_THISNODE allocation? Or a memory policy restricted allocations?

> So we need functions translating our demanded kmalloc space into a page
> reserve limit, and then need to provide a reserve of pages.

Only kmalloc? What about skb heads and such?

> And we need to ensure that once we hit the reserve, the slab allocator honours
> the reserve's access. That is, a regular allocation may not get objects from
> a slab allocated from the reserves.

>From a cpuset we may hit the reserves since cpuset memory is out and then 
the rest of the system fails allocations?
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