linux-kernel - Re: [RFC] some page can't be migrated

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Message-Id: <200801251620.38236.nickpiggin@yahoo.com.au>
Date:	Fri, 25 Jan 2008 16:20:38 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	clameter <clameter@....com>
Subject: Re: [RFC] some page can't be migrated

On Friday 25 January 2008 14:09, Shaohua Li wrote:
> On Fri, 2008-01-25 at 14:03 +1100, Nick Piggin wrote:
> > On Wednesday 23 January 2008 17:22, Shaohua Li wrote:
> > > Anonymous page might have fs-private metadata, the page is truncated.
> > > As the page hasn't mapping, page migration refuse to migrate the page.
> > > It appears the page is only freed in page reclaim and if zone watermark
> > > is low, the page is never freed, as a result migration always fail. I
> > > thought we could free the metadata so such page can be freed in
> > > migration and make migration more reliable?
> >
> > Anonymous pages should not have fs-private metadata.
> >
> > Orphaned pages I guess you mean?
>
> yes, maybe, but the comments in truncate_complete_page called the page
> anonymous.

Ah, I see. I think we should use orphaned (or anything except
anonymous) to describe these pages.
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