linux-kernel - Re: [BUGFIX]{PATCH] flush icache on ia64 take2

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Date:	Fri, 20 Jul 2007 10:51:23 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Zoltan Menyhart <Zoltan.Menyhart@...l.net>
Cc:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, tony.luck@...el.com, nickpiggin@...oo.com.au,
	mike@...oyan.net, dmosberger@...il.com, y-goto@...fujitsu.com
Subject: Re: [BUGFIX]{PATCH] flush icache on ia64 take2

On Thu, 19 Jul 2007 17:18:59 +0200
Zoltan Menyhart <Zoltan.Menyhart@...l.net> wrote:

> KAMEZAWA Hiroyuki wrote:
> 
> > Hmm...but the current code flushes the page. just do it in "lazy" way.
> > much difference ?
> 
> I agree the current code flushes the I-cache for all kinds of file
> systems (for PTEs with the exec bit on).
> 
> The error is that it does it after the PTE is written.
> 
> In addition, I wanted to optimize it to gain a few %.
I'm glad, too if we can do it. But it seems that we need a bit
clever way to do that.

> Apparently this idea is not much welcome.
> 
> I can agree that flushing the I-cache (if the architecture requires it)
> before setting the PTE eliminates the error.
> 
Hm, I'll refresh and repost the patch. 

Thanks,
-Kame

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