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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Date:	Mon, 4 Feb 2013 16:18:48 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lin Feng <linfeng@...fujitsu.com>, mgorman@...e.de, 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, 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()


Also...

On Mon, 4 Feb 2013 16:06:24 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> > +put_page:
> > +	/* Undo the effects of former get_user_pages(), we won't pin anything */
> > +	for (i = 0; i < ret; i++)
> > +		put_page(pages[i]);

We can use release_pages() here.

release_pages() is designed to be more efficient when we're putting the
final reference to (most of) the pages.  It probably has little if any
benefit when putting still-in-use pages, as we're doing here.

But please consider...
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