From: Keir Fraser <keir@xensource.com>
To: Jan Beulich <jbeulich@novell.com>
Cc: xen-devel@lists.xensource.com, Ben Thomas <bthomas@virtualiron.com>
Subject: Re: page_alloc query
Date: Wed, 07 Mar 2007 09:40:03 +0000 [thread overview]
Message-ID: <C21438F3.ABE7%keir@xensource.com> (raw)
In-Reply-To: <45EE915A.76E4.0078.0@novell.com>
On 7/3/07 09:18, "Jan Beulich" <jbeulich@novell.com> 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
prev parent reply other threads:[~2007-03-07 9:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-06 22:10 page_alloc query Ben Thomas
2007-03-07 8:27 ` Keir Fraser
2007-03-07 9:09 ` Jan Beulich
2007-03-07 9:18 ` Jan Beulich
2007-03-07 9:40 ` Keir Fraser [this message]
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