linux-kernel - Re: [patch 07/20] Allow paravirt backend to choose kernel PMD sharing

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Date:	Wed, 04 Apr 2007 17:43:13 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Christoph Lameter <clameter@....com>
CC:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	virtualization@...ts.osdl.org, lkml <linux-kernel@...r.kernel.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	Zachary Amsden <zach@...are.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 07/20] Allow paravirt backend to choose kernel PMD sharing

Christoph Lameter wrote:
> Acked-by: Christoph Lameter <clameter@....com>
>
> for all thats worth since I am not a i386 specialist.
>
> How much of the issues with page struct sharing between slab and arch code 
> does this address?
>   

I haven't been following that thread as closely as I should be, so I
don't have an answer.  I guess the interesting thing in this patch is
that it only uses the pmd cache for usermode pmds (which are
pre-zeroed), and normal page allocations for kernel pmds.  Also, if the
kernel pmds are unshared, the pgds are page-sized, so its not really
making good use of the pgd cache.

    J
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