From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@zip.com.au>
Cc: Daniel Phillips <phillips@arcor.de>,
Rik van Riel <riel@conectiva.com.br>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: how not to write a search algorithm
Date: Sun, 4 Aug 2002 16:00:07 -0700 [thread overview]
Message-ID: <20020804230007.GJ4010@holomorphy.com> (raw)
In-Reply-To: <3D4DB2AF.48B07053@zip.com.au>
On Sun, Aug 04, 2002 at 04:03:11PM -0700, Andrew Morton wrote:
> The list walk is killing us now. I think we need:
> struct pte_chain {
> struct pte_chain *next;
> pte_t *ptes[L1_CACHE_BYTES/4 - 4];
> };
> Still poking...
Could I get a
pte_t *ptes[(L1_CACHE_BYTES - sizeof(struct pte_chain *))/(sizeof(pte_t *))] ?
Well, regardless, the mean pte_chain length for chains of length > 1 is
around 6, and the std. dev. is around 12, and the distribution is *very*
long-tailed, so this is just about guaranteed to help at the cost of some
slight internal fragmentation.
Cheers,
Bill
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next prev parent reply other threads:[~2002-08-04 23:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-04 8:35 how not to write a search algorithm Andrew Morton
2002-08-04 13:16 ` Rik van Riel
2002-08-04 20:00 ` Andrew Morton
2002-08-04 19:54 ` Rik van Riel
2002-08-04 20:38 ` William Lee Irwin III
2002-08-04 21:09 ` Andrew Morton
2002-08-04 22:02 ` William Lee Irwin III
2002-08-04 22:43 ` Andrew Morton
2002-08-04 22:47 ` William Lee Irwin III
2002-08-05 3:00 ` Andrew Morton
2002-08-05 2:55 ` Rik van Riel
2002-08-05 7:40 ` William Lee Irwin III
2002-08-05 8:44 ` Andrew Morton
2002-08-05 10:50 ` William Lee Irwin III
2002-08-04 22:45 ` Daniel Phillips
2002-08-04 23:03 ` Andrew Morton
2002-08-04 23:00 ` William Lee Irwin III [this message]
2002-08-04 23:02 ` Daniel Phillips
2002-08-04 23:21 ` Andrew Morton
2002-08-05 0:03 ` Daniel Phillips
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