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

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Message-ID: <Pine.LNX.4.64.0705140927470.10801@schroedinger.engr.sgi.com>
Date:	Mon, 14 May 2007 09:29:15 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Matt Mackall <mpm@...enic.com>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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 Mon, 14 May 2007, Matt Mackall wrote:

> privileged thread                      unprivileged greedy process
> kmem_cache_alloc(...)
>    adds new slab page from lowmem pool

Yes but it returns an object for the privileged thread. Is that not 
enough?


> do_io()
>                                        kmem_cache_alloc(...)
>                                        kmem_cache_alloc(...)
>                                        kmem_cache_alloc(...)
>                                        kmem_cache_alloc(...)
>                                        kmem_cache_alloc(...)
>                                        ...
>                                           eats it all
> kmem_cache_alloc(...) -> ENOMEM
>    who ate my donuts?!
> 
> But I think this solution is somehow overkill. If we only care about
> this issue in the OOM avoidance case, then our rank reduces to a
> boolean.
> 
> -- 
> Mathematics is the supreme nostalgia of our time.
> 
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