Date: Wed, 7 May 2003 13:08:46 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Daniel Eischen <eischen@pcnet1.pcnet.com> Cc: David Xu <davidxu@freebsd.org> Subject: Re: kern_threads.c.. upcall question.. Message-ID: <Pine.BSF.4.21.0305071307260.47162-100000@InterJet.elischer.org> In-Reply-To: <Pine.GSO.4.10.10305060910120.11430-100000@pcnet1.pcnet.com>
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On Tue, 6 May 2003, Daniel Eischen wrote: > On Tue, 6 May 2003, Julian Elischer wrote: > > > > On Tue, 6 May 2003, David Xu wrote: > > > > > > > > > I think this could be optimised even more. > > > > (why copy the FP regs if they are not valid) (etc). > > > > but it is an improvement.. > > > > > > > > > > Why need we an intermediate mcontext_t, why not > > > direct copy the context in trap frame to userland space? > > > This should be fastest. :-) > > > > this is what I was thinking.. > > get_mcontext_user(td, addr) > > [...] > > Don't break validation and setting of FP validity and type. > get_mcontext() knows how to mark the validity of the FPU > set and it's type (387 or SSE). The UTS relies on this > information. Be very careful. Can you test david's simple patch that just removes the copy-in? We can wate til later to do the optimisations.. > > -- > Dan Eischen > >help
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