From: "Martin J. Bligh" <mbligh@mbligh.org>
To: Christoph Lameter <clameter@engr.sgi.com>, torvalds@osdl.org
Cc: akpm@osdl.org, nickpiggin@yahoo.com.au, hugh@veritas.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: Hugh's alternate page fault scalability approach on 512p Altix
Date: Wed, 07 Sep 2005 07:28:44 -0700 [thread overview]
Message-ID: <20660000.1126103324@[10.10.2.4]> (raw)
In-Reply-To: <Pine.LNX.4.62.0509061129380.16939@schroedinger.engr.sgi.com>
> Anticipatory prefaulting raises the highest fault rate obtainable three-fold
> through gang scheduling faults but may allocate some pages to a task that are
> not needed.
IIRC that costed more than it saved, at least for forky workloads like a
kernel compile - extra cost in zap_pte_range etc. If things have changed
substantially in that path, I guess we could run the numbers again - has
been a couple of years.
M.
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next prev parent reply other threads:[~2005-09-07 14:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-06 18:31 Christoph Lameter
2005-09-07 14:28 ` Martin J. Bligh [this message]
2005-09-07 15:42 ` Christoph Lameter
2005-09-07 18:19 ` Martin J. Bligh
2005-09-15 12:54 ` Pavel Machek
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