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

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Message-ID: <20070309025232.GD24695@kryten>
Date:	Thu, 8 Mar 2007 20:52:32 -0600
From:	Anton Blanchard <anton@...ba.org>
To:	Kyle Moffett <mrmacman_g4@....com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	"Michael K. Edwards" <medwards.linux@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Davide Libenzi <davidel@...ilserver.org>,
	Avi Kivity <avi@...o.co.il>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [patch] epoll use a single inode ...


Hi,

> Well, PowerPC "dcbt" does prefetch() correctly, it doesn't ever raise  
> exceptions, doesn't have any side effects, takes only enough CPU to  
> decode the address, and is ignored if it would have to do anything  
> other than load the cacheline from RAM.  Prefetch streams are halted  
> when they reach the end of a page boundary (no trapping to the MMU)  
> and if the TLB entry isn't present then they would asynchronously  
> abort.  

It depends on the implementation and the HID bit settings. Some do walk
the MMU hashtable if it isnt in the TLB.

Anton
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