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

[Pavel Emelyanov]

On 04/12/2013 01:19 AM, Andrew Morton wrote:
> On Thu, 11 Apr 2013 15:29:41 +0400 Pavel Emelyanov <xemul@xxxxxxxxxxxxx> 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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