linux-kernel - Re: [RFC][PATCH 3/3] mm: slabs: reset page at free

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Date:	Thu, 12 Dec 2013 17:44:18 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Dave Hansen <dave@...1.net>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kirill.shutemov@...ux.intel.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [RFC][PATCH 3/3] mm: slabs: reset page at free

On Wed, 11 Dec 2013, Dave Hansen wrote:

> We now have slub's ->freelist usage impinging on page->mapping's
> storage space.  The buddy allocator wants ->mapping to be NULL
> when a page is handed back, so we have to make sure that it is
> cleared.
>
> Note that slab already doeds this, so just create a common helper
> and have all the slabs do it this way.  ->mapping is right next
> to ->flags, so it's virtually guaranteed to be in the L1 at this
> point, so this shouldn't cost very much to do in practice.

Maybe add a common page alloc and free function in mm/slab_common.c?

All the allocators do similar things after all.
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