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

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Message-ID: <Pine.LNX.4.64.0703061008570.12892@alien.or.mcafeemobile.com>
Date:	Tue, 6 Mar 2007 10:10:05 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Eric Dumazet <dada1@...mosbay.com>,
	Linus Torvalds <torvalds@...ux-foundation.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 ...

On Tue, 6 Mar 2007, H. Peter Anvin wrote:

> Eric Dumazet wrote:
> > 
> > For epoll, I suspect this is harmless : Programs dont allocate epolls fd
> > every milli second, but at startup only.
> > 
> > For pipes/sockets, using a 64 bits would be problematic, because sprintf()
> > uses a divide for each digit. And a divide is slow. Ten divides are *very*
> > slow.
> > 
> 
> That's true for *any* sprintf(), though.  sprintf() converts all its arguments
> to 64 bits.

Sigh! We *always* do do_div(), even for the more trivial %x case.
Anyway, it does not really matter for the type of dfs will be applied to.


- Davide


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