Re: [RFC][PATCH] nameing reserved pages [0/3]

[Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Arjan van de Ven wrote:

>>For example, Memory Hotplug can ignore (a).
>>    
>>
>
>Memory Hotplug can also use page_is_ram().
>  
>
Yes. we can use page_is_ram() for finding (a)memory hole.
But I'd like to catch other removable PG_reserved pages like (d)Isorated 
by MCA (e)used by perfmon and
some of (b) used by kernerl and (c) Set by drivers.
What I'm thinking of is to detect whether memory is hot-removable or not 
before removing actually.

>/dev/memstate really looks like a bad idea to me as well... I rather
>have less than more /dev/*mem*
>  
>
For showing page usage and its "location", I've thought of other 
interface, sysfs, procfs...
But I have no idea.
Physical memory area has vast space and I want to use lseek() or 
ioctl().( I don't like  ioctl())
Do you have any recommendation ?

-- Kame