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
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