linux-kernel - Re: [PATCH] undo the brd.c part of ramfs-and-ram-disk-pages-are-unevictable.patch

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Message-ID: <20080612150558.5c8e92a4@cuia.bos.redhat.com>
Date:	Thu, 12 Jun 2008 15:05:58 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [PATCH] undo the brd.c part of
 ramfs-and-ram-disk-pages-are-unevictable.patch

On Thu, 12 Jun 2008 15:00:57 -0400
Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:

> On Thu, 2008-06-12 at 13:53 -0400, Rik van Riel wrote:
> > Undo the brd.c part of ramfs-and-ram-disk-pages-are-unevictable.patch.
> > The brd pages do not live on the LRU at all, so there is no need to
> > play these tricks.
> 
> Does this mean that these pages cannot be migrated?  E.g., to evacuate
> memory for hotplug?  Looks like all paths to migrate_pages() construct a
> list of pages to migrate by isolating them from the lru
> [isolate_lru_page()].  Any pages not found in the lru are skipped.

It looks like that, indeed.

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