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

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Date:	Thu, 19 Jul 2007 17:18:59 +0200
From:	Zoltan Menyhart <Zoltan.Menyhart@...l.net>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
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

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 %.
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.

Thanks,

Zoltan
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