From: William Lee Irwin III <wli@holomorphy.com>
To: Hanna Linder <hannal@us.ibm.com>
Cc: lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: Minutes from LSE Call March 7
Date: Fri, 7 Mar 2003 10:36:47 -0800 [thread overview]
Message-ID: <20030307183647.GF465@holomorphy.com> (raw)
In-Reply-To: <17720000.1047062069@w-hlinder>
On Fri, Mar 07, 2003 at 10:34:29AM -0800, Hanna Linder wrote:
> Bill is using some simplified heuristics to search
> for pages to fault in. Turns out those heuristics
> suck so he needs to go in and do a different set.
> The ones originally done in Hugh's patch did something
> in the order of scanning acros an entire vma looking
> for pte's pointing to a particular page. It didnt
> have any alignment restrictions. Bill does have
> alignment restrictions and Hugh's solution would
> break down pretty quickly (kernel compiles swapping).
The bit about Hugh's heuristics is backward; the heuristics he used
for 2.4.x were very effective. It's my homegrown heuristics that are
breaking down very quickly wrt. performance and fragmentation.
-- wli
next prev parent reply other threads:[~2003-03-07 18:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-07 18:34 Minutes from LSE Call March 7 Hanna Linder
2003-03-07 18:36 ` William Lee Irwin III [this message]
2003-03-07 20:26 ` [Lse-tech] " Paul Larson
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