linux-kernel - Re: [PATCH -mm 14/24] Ramfs and Ram Disk pages are unevictable

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Message-Id: <200806130357.53669.nickpiggin@yahoo.com.au>
Date:	Fri, 13 Jun 2008 03:57:53 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	Kosaki Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, Eric Whitney <eric.whitney@...com>
Subject: Re: [PATCH -mm 14/24] Ramfs and Ram Disk pages are unevictable

On Friday 13 June 2008 03:50, Rik van Riel wrote:
> On Fri, 13 Jun 2008 03:37:56 +1000
>
> Nick Piggin <nickpiggin@...oo.com.au> wrote:
> > > > This isn't the case for brd any longer. It doesn't use the buffer
> > > > cache as its backing store, so the buffer cache is reclaimable.
> > >
> > > I know that pages of files that got paged into the page
> > > cache from the ramdisk can be evicted (back to the ram
> > > disk), but how do the brd pages themselves behave?
> >
> > They are not reclaimable. But they have nothing (directly) to do
> > with brd's i_mapping address space, nor are they put on any LRU
> > lists.
>
> Ahhhh, doh!
>
> I'm mailing Andrew a patch right now that undoes the
> brd.c part of patch 14/24. The ramdisk part is correct
> and should stay (afaict).

The ramfs part? Yes, that looks correct to me.
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