linux-kernel - Re: [PATCH 1/1] PARISC: unwind - optimise linked-list searches for modules

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Message-ID: <20101022011247.GM8332@bombadil.infradead.org>
Date:	Thu, 21 Oct 2010 21:12:47 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Phil Carmody <ext-phil.2.carmody@...ia.com>
Cc:	kyle@...artin.ca, deller@....de, jejb@...isc-linux.org,
	linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] PARISC: unwind - optimise linked-list searches for
 modules

On Fri, Sep 10, 2010 at 01:47:59PM +0300, Phil Carmody wrote:
> Having many dozens of modules, the searches down the linked
> list of sections would dominate the lookup time, dwarfing
> any savings from the binary search within the section.
> 
> A simple move-to-front optimisation exploits the commonality
> of the code paths taken, and in simple real-world tests
> on other architectures reduced the number of steps in the
> search to barely more than 1.
> 

Applied, thanks.

--kyle
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