From: Andrew Morton <akpm@linux-foundation.org>
To: Seth Jennings <sjenning@linux.vnet.ibm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Nitin Gupta <ngupta@vflare.org>, Minchan Kim <minchan@kernel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Dan Magenheimer <dan.magenheimer@oracle.com>,
Robert Jennings <rcj@linux.vnet.ibm.com>,
Jenifer Hopper <jhopper@us.ibm.com>, Mel Gorman <mgorman@suse.de>,
Johannes Weiner <jweiner@redhat.com>,
Rik van Riel <riel@redhat.com>,
Larry Woodman <lwoodman@redhat.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Dave Hansen <dave@sr71.net>, Joe Perches <joe@perches.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Cody P Schafer <cody@linux.vnet.ibm.com>,
Hugh Dickens <hughd@google.com>,
Paul Mackerras <paulus@samba.org>,
Heesub Shin <heesub.shin@samsung.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
devel@driverdev.osuosl.org
Subject: Re: [PATCHv12 2/4] zbud: add to mm/
Date: Wed, 29 May 2013 13:48:35 -0700 [thread overview]
Message-ID: <20130529134835.58dd89774f47205da4a06202@linux-foundation.org> (raw)
In-Reply-To: <20130529204236.GD428@cerebellum>
On Wed, 29 May 2013 15:42:36 -0500 Seth Jennings <sjenning@linux.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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next prev parent reply other threads:[~2013-05-29 20:48 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-20 16:26 [PATCHv12 0/4] zswap: compressed swap caching Seth Jennings
2013-05-20 16:26 ` [PATCHv12 1/4] debugfs: add get/set for atomic types Seth Jennings
2013-05-29 17:42 ` Konrad Rzeszutek Wilk
2013-05-20 16:26 ` [PATCHv12 2/4] zbud: add to mm/ Seth Jennings
2013-05-21 3:37 ` Bob Liu
2013-05-28 21:59 ` Andrew Morton
2013-05-29 15:45 ` Seth Jennings
2013-05-29 18:34 ` Andrew Morton
2013-05-29 20:42 ` Seth Jennings
2013-05-29 20:48 ` Andrew Morton [this message]
2013-05-29 21:09 ` Dan Magenheimer
2013-05-29 21:29 ` Andrew Morton
2013-05-30 17:43 ` Seth Jennings
2013-05-30 21:20 ` Seth Jennings
2013-05-31 1:48 ` Bob Liu
2013-06-03 13:48 ` Konrad Rzeszutek Wilk
2013-05-29 20:45 ` Seth Jennings
2013-05-20 16:26 ` [PATCHv12 3/4] zswap: " Seth Jennings
2013-05-21 3:31 ` Bob Liu
2013-05-28 21:59 ` Andrew Morton
2013-05-29 14:57 ` Seth Jennings
2013-05-29 18:29 ` Andrew Morton
2013-05-29 19:50 ` Seth Jennings
2013-05-29 19:57 ` Andrew Morton
2013-05-29 21:08 ` Seth Jennings
2013-05-29 21:16 ` Andrew Morton
2013-05-20 16:26 ` [PATCHv12 4/4] zswap: add documentation Seth Jennings
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