linux-kernel - Re: [PATCH v5 10/18] sl[au]b: always get the cache from its page in kfree

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Message-ID: <50851C54.9080600@parallels.com>
Date:	Mon, 22 Oct 2012 14:13:40 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<cgroups@...r.kernel.org>, Mel Gorman <mgorman@...e.de>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	<kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>, <devel@...nvz.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH v5 10/18] sl[au]b: always get the cache from its page
 in kfree

On 10/19/2012 11:44 PM, Christoph Lameter wrote:
> On Fri, 19 Oct 2012, Glauber Costa wrote:
> 
>> struct page already have this information. If we start chaining
>> caches, this information will always be more trustworthy than
>> whatever is passed into the function
> 
> Yes it does but the information is not standardized between the allocators
> yet. Coul you unify that? Come out with a struct page overlay that is as
> much the same as possible. Then kfree can also be unified because the
> lookup is always the same. That way you can move kfree into slab_common
> and avoid modifying multiple allocators.
> 

Ok, this is yet another changelog mistake from mine. This function is
not about kfree, but kmem_cache_free.

But part of your comment still applies, the page lookup can still be
common. I will take a look at that.

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