linux-kernel - Re: [PATCHv12 2/4] zbud: add to mm/

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Message-Id: <20130529134835.58dd89774f47205da4a06202@linux-foundation.org>
Date:	Wed, 29 May 2013 13:48:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Jenifer Hopper <jhopper@...ibm.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Dave Hansen <dave@...1.net>, Joe Perches <joe@...ches.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Hugh Dickens <hughd@...gle.com>,
	Paul Mackerras <paulus@...ba.org>,
	Heesub Shin <heesub.shin@...sung.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCHv12 2/4] zbud: add to mm/

On Wed, 29 May 2013 15:42:36 -0500 Seth Jennings <sjenning@...ux.vnet.ibm.com> wrote:

> > > > I worry about any code which independently looks at the pageframe
> > > > tables and expects to find page struts there.  One example is probably
> > > > memory_failure() but there are probably others.
> > 
> > ^^ this, please.  It could be kinda fatal.
> 
> I'll look into this.
> 
> The expected behavior is that memory_failure() should handle zbud pages in the
> same way that it handles in-use slub/slab/slob pages and return -EBUSY.

memory_failure() is merely an example of a general problem: code which
reads from the memmap[] array and expects its elements to be of type
`struct page'.  Other examples might be memory hotplugging, memory leak
checkers etc.  I have vague memories of out-of-tree patches
(bigphysarea?) doing this as well.

It's a general problem to which we need a general solution.
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