linux-kernel - Re: [PATCH 4/5] pagemap: Introduce the /proc/PID/pagemap2 file

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Message-ID: <516807CB.6040208@parallels.com>
Date:	Fri, 12 Apr 2013 17:10:35 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linux MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] pagemap: Introduce the /proc/PID/pagemap2 file

On 04/12/2013 01:19 AM, Andrew Morton wrote:
> On Thu, 11 Apr 2013 15:29:41 +0400 Pavel Emelyanov <xemul@...allels.com> wrote:
> 
>> This file is the same as the pagemap one, but shows entries with bits
>> 55-60 being zero (reserved for future use). Next patch will occupy one
>> of them.
> 
> I'm not understanding the motivation for this.  What does the current
> /proc/pid/pagemap have in those bit positions?

A constant PAGE_SHIFT value.

> 
> .
> 

Thanks,
Pavel
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