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[Xen-devel] Re: [PATCH 1/3] mm: Optimize pfn calculation in online_page()

To: Daniel Kiper <dkiper@xxxxxxxxxxxx>
From: David Rientjes <rientjes@xxxxxxxxxx>
Date: Mon, 28 Mar 2011 15:41:53 -0700 (PDT)
Cc: jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, ian.campbell@xxxxxxxxxx, haicheng.li@xxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dan.magenheimer@xxxxxxxxxx, v.tolstov@xxxxxxxxx, dave@xxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, andi.kleen@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, fengguang.wu@xxxxxxxxx, wdauchy@xxxxxxxxx
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List-id: Xen developer discussion <xen-devel.lists.xensource.com>

On Mon, 28 Mar 2011, Daniel Kiper wrote:

> If CONFIG_FLATMEM is enabled pfn is calculated in online_page()
> more than once. It is possible to optimize that and use value
> established at beginning of that function.
> 
> Signed-off-by: Daniel Kiper <dkiper@xxxxxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>

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