Date: Tue, 6 Apr 1999 10:47:21 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: will@iki.fi (Ville-Pertti Keinonen) Cc: dyson@iquest.net, current@freebsd.org Subject: Re: SMP users (important) Message-ID: <199904061547.KAA28401@dyson.iquest.net> In-Reply-To: <86wvzqm7pe.fsf@not.oeno.com> from Ville-Pertti Keinonen at "Apr 6, 99 12:14:37 pm"
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> > > per-processor registers that one could use (but loading a > > general register with that per processor register would be > > needed for access.) Also, since the PPC has lots of registers, > > one could? permanently reserve one of the general registers (r13?). > > I really don't like the idea of breaking the normal language > conventions for any processor. For the i386, the use of segment > registers is not relevant to C language conventions, but reserving a > general register on any architecture should, IMHO, be avoided if at > all possible. > I believe that SYSV might do it. > > I believe that having meaningful values context-switched in segment > registers can add context switch overhead. It shouldn't be > significant, though. > It is probably *much* cheaper than the VM approaches. John To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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