On Thu, Jun 02, 2005 at 01:43:54AM -0400, john cooper wrote:
> That might have been me. The last time I looked at this
> specifically, full transitive promotion was being done in
> the RT patch. However unlike your attempt at scaling the
> lock scope, the RT patch had one lock which coordinated
> all mutex dependency traversals system wide. This lock
> must be speculatively acquired even before we ascertain
> transitive promotion is required.
>
> So it doesn't scale as well as it could in the case of
> large count SMP systems. The response was that of "get
> it to work first and then we'll get it to scale" which
> is reasonable.
Just curious, what do you thinks about the rw-lock comments
from Esben in that a real rw-lock can't be deterministic ?
bill
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