linux-kernel - Re: [patch v2] epoll use a single inode ...

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Message-ID: <45EDA15F.5090805@zytor.com>
Date:	Tue, 06 Mar 2007 09:14:07 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Eric Dumazet <dada1@...mosbay.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch v2] epoll use a single inode ...

Linus Torvalds wrote:
> 
>> However, this could be optimized.  I think right now sprintf() uses a generic
>> divide-by-base, but a divide by 8 and 16 can of course be handled with a
>> shift, and divide by 10 can be replaced with a multiplication by
>> 0x1999999999999999ULL on most architectures.
> 
> Nope. You need both the result of the division *and* the remainder, and 
> you can't do that with a single multiply.

Oh, right.  *D'oh*.

	-hpa
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