Message-ID: <41408B41.4030306@am.sony.com>
Date: Thu, 09 Sep 2004 09:56:33 -0700
From: Tim Bird <tim.bird@am.sony.com>
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To: arjanv@redhat.com
CC: colin <colin@realtek.com.tw>, linux-kernel@vger.kernel.org
Subject: Re: What File System supports Application XIP
References: <1094723597.2801.8.camel@laptop.fenrus.com>
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Arjan van de Ven wrote:
> On Thu, 2004-09-09 at 11:45, colin wrote:
>> Hi,
>> How does ramfs offer application XIP ability?
>> I mean, when the ramfs image is mounted and the application in it is
>> executed,
>> "exec", which is called by sh, should first copy every section of the
>> application to RAM and then jump to the text section.
>> How do I avoid the stage copying text section to RAM?
> 
> this is not how linux works. programs execute directly from the
> pagecache without copy.

Most other filesystems populate the pagecache with I/O, presumably.
In the case of a ramfs, is the page mapped directly from the fs
into the pagecache without a copy?

=============================
Tim Bird
Architecture Group Co-Chair, CE Linux Forum
Senior Staff Engineer, Sony Electronics
E-mail: tim.bird@am.sony.com
=============================
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