linux-kernel - Re: [PATCH RFC 1/5] scripts: Add sortextable to sort the kernel's exception table.

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Message-ID: <4EC98DB3.1090008@kernel.org>
Date:	Sun, 20 Nov 2011 15:30:59 -0800
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	David Woodhouse <dwmw2@...radead.org>
CC:	David Daney <ddaney.cavm@...il.com>, linux-mips@...ux-mips.org,
	ralf@...ux-mips.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-embedded@...r.kernel.org,
	x86@...nel.org, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH RFC 1/5] scripts: Add sortextable to sort the kernel's
 exception table.

On 11/20/2011 03:28 PM, David Woodhouse wrote:
> On Sun, 2011-11-20 at 15:26 -0800, H. Peter Anvin wrote:
>> If we're going to do this at build time, I would suggest using a
>> collisionless hash instead.  The lookup time for those are O(1), but
>> they definitely need to be done at build time. 
> 
> Is the lookup time really an issue?
> 

Probably not a big one (in most scenarios), but with better exception
handling it might stretch the usability of exceptions.  The bigger thing
is that once you're doing a build-time special handler for this
*anyway*, you might as well drive the cost of the lookup to functionally
zero.

	-hpa
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