linux-kernel - Re: [BUGFIX][PATCH] DO flush icache before set

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Message-Id: <20070707065712.5abbbe43.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Sat, 7 Jul 2007 06:57:12 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <clameter@....com>
Cc:	nickpiggin@...oo.com.au, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	linux-mm@...ck.org, Mike.stroya@...com, y-goto@...fujitsu.com,
	dmosberger@...il.com, hugh@...itas.com
Subject: Re: [BUGFIX][PATCH] DO flush icache before set_pte() on ia64.

On Fri, 6 Jul 2007 10:32:29 -0700 (PDT)
Christoph Lameter <clameter@....com> wrote:

> I am a bit worried about the performance impact of all this flushing? What 
> is the worst case scenario here?
> 

IMHO....
When a user set VM_EXEC to their anonymous memory intentionally and
does many page faults.

I myself don't think (file's) page cache flushing is not so heavy work because
PG_arch_1 guarantees that icache flushing occurs just once at the first 
read in the system.

Thanks,
-Kame

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