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

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Date:	Thu, 24 Jan 2008 19:09:25 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] some page can't be migrated

On Fri, 25 Jan 2008, 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? They should not be accessable via
> the pagecache or the page tables, so how do they keep tangling up
> migration? Where/how is migration finding these pages?!

Is this maybe related to memory unplug or some such project?

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