From: Andrew Morton <akpm@linux-foundation.org>
To: Matt Mackall <mpm@selenic.com>
Cc: Christoph Lameter <clameter@sgi.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Thomas Graf <tgraf@suug.ch>, David Miller <davem@davemloft.net>,
Daniel Phillips <phillips@google.com>,
Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [PATCH 0/5] make slab gfp fair
Date: Mon, 14 May 2007 12:44:51 -0700 [thread overview]
Message-ID: <20070514124451.c868c4c0.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070514161224.GC11115@waste.org>
On Mon, 14 May 2007 11:12:24 -0500
Matt Mackall <mpm@selenic.com> wrote:
> If I understand this correctly:
>
> privileged thread unprivileged greedy process
> kmem_cache_alloc(...)
> adds new slab page from lowmem pool
> 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?!
Yes, that's my understanding also.
I can see why it's a problem in theory, but I don't think Peter has yet
revealed to us why it's a problem in practice. I got all excited when
Christoph asked "I am not sure what the point of all of this is.", but
Peter cunningly avoided answering that ;)
What observed problem is being fixed here?
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next prev parent reply other threads:[~2007-05-14 19:44 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-14 13:19 Peter Zijlstra
2007-05-14 13:19 ` [PATCH 1/5] mm: page allocation rank Peter Zijlstra
2007-05-14 13:19 ` [PATCH 2/5] mm: slab allocation fairness Peter Zijlstra
2007-05-14 15:51 ` Christoph Lameter
2007-05-14 13:19 ` [PATCH 3/5] mm: slub " Peter Zijlstra
2007-05-14 15:49 ` Christoph Lameter
2007-05-14 16:14 ` Peter Zijlstra
2007-05-14 16:35 ` Christoph Lameter
2007-05-14 13:19 ` [PATCH 4/5] mm: slob " Peter Zijlstra
2007-05-14 13:19 ` [PATCH 5/5] mm: allow mempool to fall back to memalloc reserves Peter Zijlstra
2007-05-14 15:53 ` [PATCH 0/5] make slab gfp fair Christoph Lameter
2007-05-14 16:10 ` Peter Zijlstra
2007-05-14 16:37 ` Christoph Lameter
2007-05-14 16:12 ` Matt Mackall
2007-05-14 16:29 ` Christoph Lameter
2007-05-14 17:40 ` Peter Zijlstra
2007-05-14 17:57 ` Christoph Lameter
2007-05-14 19:28 ` Peter Zijlstra
2007-05-14 19:56 ` Christoph Lameter
2007-05-14 20:03 ` Peter Zijlstra
2007-05-14 20:06 ` Christoph Lameter
2007-05-14 20:12 ` Peter Zijlstra
2007-05-14 20:25 ` Christoph Lameter
2007-05-15 17:27 ` Peter Zijlstra
2007-05-15 22:02 ` Christoph Lameter
2007-05-16 6:59 ` Peter Zijlstra
2007-05-16 18:43 ` Christoph Lameter
2007-05-16 19:25 ` Peter Zijlstra
2007-05-16 19:53 ` Christoph Lameter
2007-05-16 20:18 ` Peter Zijlstra
2007-05-16 20:27 ` Christoph Lameter
2007-05-16 20:40 ` Peter Zijlstra
2007-05-16 20:44 ` Christoph Lameter
2007-05-16 20:54 ` Peter Zijlstra
2007-05-16 20:59 ` Christoph Lameter
2007-05-16 21:04 ` Peter Zijlstra
2007-05-16 21:13 ` Christoph Lameter
2007-05-16 21:20 ` Peter Zijlstra
2007-05-16 21:42 ` Christoph Lameter
2007-05-17 7:28 ` Peter Zijlstra
2007-05-17 17:30 ` Christoph Lameter
2007-05-17 17:53 ` Peter Zijlstra
2007-05-17 18:01 ` Christoph Lameter
2007-05-14 19:44 ` Andrew Morton [this message]
2007-05-14 20:01 ` Matt Mackall
2007-05-14 20:05 ` Peter Zijlstra
2007-05-17 3:02 ` Christoph Lameter
2007-05-17 7:08 ` Peter Zijlstra
2007-05-17 17:29 ` Christoph Lameter
2007-05-17 17:52 ` Peter Zijlstra
2007-05-17 17:59 ` Christoph Lameter
2007-05-17 17:53 ` Matt Mackall
2007-05-17 18:02 ` Christoph Lameter
2007-05-17 19:18 ` Peter Zijlstra
2007-05-17 19:24 ` Christoph Lameter
2007-05-17 21:26 ` Peter Zijlstra
2007-05-17 21:44 ` Paul Jackson
2007-05-17 22:27 ` Christoph Lameter
2007-05-18 9:54 ` Peter Zijlstra
2007-05-18 17:11 ` Paul Jackson
2007-05-18 17:11 ` Christoph Lameter
2007-05-20 8:39 ` Peter Zijlstra
2007-05-21 16:45 ` Christoph Lameter
2007-05-21 19:33 ` Peter Zijlstra
2007-05-21 19:43 ` Christoph Lameter
2007-05-21 20:08 ` Peter Zijlstra
2007-05-21 20:32 ` Christoph Lameter
2007-05-21 20:54 ` Peter Zijlstra
2007-05-21 21:04 ` Christoph Lameter
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