From: Andi Kleen <andi@firstfloor.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Pekka Enberg <penberg@kernel.org>,
Christoph Lameter <cl@linux.com>, Joonsoo Kim <js1304@gmail.com>,
David Rientjes <rientjes@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Wanpeng Li <liwanp@linux.vnet.ibm.com>
Subject: Re: [PATCH v2 00/15] slab: overload struct slab over struct page to reduce memory usage
Date: Sat, 19 Oct 2013 15:39:34 -0700 [thread overview]
Message-ID: <8738nwvqah.fsf@tassilo.jf.intel.com> (raw)
In-Reply-To: <20131016133457.60fa71f893cd2962d8ec6ff3@linux-foundation.org> (Andrew Morton's message of "Wed, 16 Oct 2013 13:34:57 -0700")
Andrew Morton <akpm@linux-foundation.org> writes:
>
> One example is mm/memory-failure.c:memory_failure(). It starts with a
> raw pfn, uses that to get at the `struct page', then starts playing
> around with it. Will that code still work correctly when some of the
> page's fields have been overlayed with slab-specific contents?
As long as PageSlab() works correctly memory_failure should be happy.
>
> This issue hasn't been well thought through. Given a random struct
> page, there isn't any protocol to determine what it actually *is*.
> It's a plain old variant record, but it lacks the agreed-upon tag field
> which tells users which variant is currently in use.
PageSlab() should work for this right?
For the generic case it may not though.
-Andi
--
ak@linux.intel.com -- Speaking for myself only
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next prev parent reply other threads:[~2013-10-19 22:39 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-16 8:43 Joonsoo Kim
2013-10-16 8:43 ` [PATCH v2 01/15] slab: correct pfmemalloc check Joonsoo Kim
2013-10-16 15:27 ` Christoph Lameter
2013-10-17 5:27 ` Joonsoo Kim
2013-10-16 8:43 ` [PATCH v2 02/15] slab: change return type of kmem_getpages() to struct page Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 03/15] slab: remove colouroff in struct slab Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 04/15] slab: remove nodeid " Joonsoo Kim
2013-10-17 19:05 ` Christoph Lameter
2013-10-16 8:44 ` [PATCH v2 05/15] slab: remove cachep in struct slab_rcu Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 06/15] slab: overloading the RCU head over the LRU for RCU free Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 07/15] slab: use well-defined macro, virt_to_slab() Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 08/15] slab: use __GFP_COMP flag for allocating slab pages Joonsoo Kim
2013-10-17 19:08 ` Christoph Lameter
2013-10-18 15:13 ` JoonSoo Kim
2013-10-16 8:44 ` [PATCH v2 09/15] slab: change the management method of free objects of the slab Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 10/15] slab: remove kmem_bufctl_t Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 11/15] slab: remove SLAB_LIMIT Joonsoo Kim
2013-10-17 19:09 ` Christoph Lameter
2013-10-16 8:44 ` [PATCH v2 12/15] slab: replace free and inuse in struct slab with newly introduced active Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 13/15] slab: use struct page for slab management Joonsoo Kim
2013-10-17 19:13 ` Christoph Lameter
2013-10-18 15:05 ` JoonSoo Kim
2013-10-20 18:05 ` Christoph Lameter
2013-10-30 8:28 ` Joonsoo Kim
2013-10-30 8:42 ` Pekka Enberg
2013-10-30 10:06 ` Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 14/15] slab: remove useless statement for checking pfmemalloc Joonsoo Kim
2013-10-16 8:44 ` [PATCH v2 15/15] slab: rename slab_bufctl to slab_freelist Joonsoo Kim
2013-10-16 20:34 ` [PATCH v2 00/15] slab: overload struct slab over struct page to reduce memory usage Andrew Morton
2013-10-17 6:01 ` Joonsoo Kim
2013-10-17 7:20 ` Pekka Enberg
2013-10-17 18:02 ` Christoph Lameter
2013-10-17 19:15 ` Christoph Lameter
2013-10-19 22:39 ` Andi Kleen [this message]
2013-10-19 22:41 ` Andi Kleen
2013-10-30 10:04 ` [PATCH v2 16/15] slab: fix to calm down kmemleak warning Joonsoo Kim
2013-10-30 10:04 ` [PATCH v2 17/15] slab: replace non-existing 'struct freelist *' with 'void *' Joonsoo Kim
2013-11-01 19:09 ` Christoph Lameter
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