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Re: [Xen-devel] page_alloc query

To: Jan Beulich <jbeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] page_alloc query
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Wed, 07 Mar 2007 09:40:03 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Ben Thomas <bthomas@xxxxxxxxxxxxxxx>
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On 7/3/07 09:18, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>> And I really think using signed variables for array indices is odd - it
>> performs
>> worse on x86-64/ia64 at least (because of the extra sign extension, whereas
>> the zero extension is implied in most/some operations), and it certainly is
>> contrary to how arrays work (they don't normally have fields accessible with
>> negative indices).
> e.g. by instead doing
>         for ( zone = zone_hi + 1; zone-- > zone_lo; )
> Jan

Hmmm... Yeah, okay.

 -- Keir

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