linux-kernel - Re: [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non

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Message-ID: <5124B42A.1020908@gmail.com>
Date:	Wed, 20 Feb 2013 19:31:54 +0800
From:	Simon Jeons <simon.jeons@...il.com>
To:	Lin Feng <linfeng@...fujitsu.com>
CC:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>, bcrl@...ck.org,
	viro@...iv.linux.org.uk, khlebnikov@...nvz.org, walken@...gle.com,
	kamezawa.hiroyu@...fujitsu.com, minchan@...nel.org,
	riel@...hat.com, rientjes@...gle.com,
	isimatu.yasuaki@...fujitsu.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, jiang.liu@...wei.com, mhocko@...e.cz,
	linux-mm@...ck.org, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages()
 called get_user_pages_non_movable()

On 02/20/2013 06:23 PM, Lin Feng wrote:
> Hi Simon,
>
> On 02/20/2013 05:58 PM, Simon Jeons wrote:
>>> The other is that this almost certainly broken for transhuge page
>>> handling. gup returns the head and tail pages and ordinarily this is ok
>> When need gup thp? in kvm case?
> gup just pins the wanted pages(for x86 is 4k size) of user address space in memory.
> We can't expect the pages have been allocated for user address space are thp or
> normal page. So we need to deal with them and I think it have nothing to do with kvm.

Ok, I'm curious about userspace process call which funtion(will call 
gup) to pin pages except make_pages_present?

>
> thanks,
> linfeng

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