Hannu Krosing wrote:
> On Wed, 2008-04-09 at 21:09 +0300, Heikki Linnakangas wrote:
>> Hannu Krosing wrote:
>>> Saving 1 byte is an atomic op
>> Unfortunately, it's not. Most if not all modern CPUs will perform one
>> byte modification as "load word" + "modify word" + "save word".
>
> Hmm, maybe we I should change my design to modify page free info and its
> parent together ?
>
> or what is word ? 2 bytes ? 4 bytes ? even 8 bytes ?
It depends on architecture, I believe it's 4 bytes on 32-bit
architectures and 8 bytes on 64-bit ones, typically. But we have to work
on all of them.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com