On Fri, 24 Mar 2000, Matthew Dillon wrote:
> Patch 04 is ready.
>
> http://www.backplane.com/FreeBSD4/
> http://www.backplane.com/FreeBSD4/smp-patch-04.diff
>
> Contains lots of cleanup of stale SMP code. There are still a few places
> where get_mplock is being called with interrupts disabled which I haven't
> found, so I put the sti test back in.
>
> I also removed the FAST_SIMPLELOCK optimization, which had been turned
> on - mainly because it's not useful if we are moving to an interrupt
> thread scheme (as in it's still a global interrupt lock, whereas the
> thread scheme will allow concurrent interrupt execution), but also
> because it makes too many assumptions about what can run outside the
> MP lock.
>
> I'm going to let people bang on this for a few days, and then I think
> it should be committed into -CURRENT (5.x) in order to allow people
> to start banging on optimizing the BGL/syscall paths. All comments
> welcome (but not necessary acted upon) :-).
I haven't looked at the patch so I can't comment on it (but it sounds very
promising).
I have been writing some of the infrastructure for SMP on alpha and as an
experiment I've been using the mutex_t primitive from BSD/OS as an
experiment. This is a nice simple api for a counting mutex which BSD/OS
4.1 uses for its BGL. I have not yet seen the new BSD/OS smp code but it
seemed that using mutex_t might make it marginally easier to work with
that.
--
Doug Rabson Mail: [EMAIL PROTECTED]
Nonlinear Systems Ltd. Phone: +44 181 442 9037
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