Messages in this thread |  | | Subject | Re: The disappearing sys_call_table export. | From | Alan Cox <> | Date | 05 May 2003 12:16:43 +0100 |
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On Llu, 2003-05-05 at 10:33, Terje Eggestad wrote: > 1. performance is everything.
Then you can live with building custom patched kernels
> 2. We're making a MPI library, and as such we don't have any control > with the application.
LD_PRELOAD
> 3c. It's therefore necessary for HW to access user pages.
Like TV cards do. That isnt hard
> 4. In order to to 3, the user pages must be pinned down. > 5. the way MPI is written, it's not using a special malloc() to allocate > the send receive buffers. It can't since it would break language binding > to fortran. Thus ANY writeable user page may be used.
Well not all the pages are guaranteed DMAable, so I guess you already lost.
> 10. kernel patches are impractical, I must be able to do this with std > stock, redhat, AND suse kernels.
So you want every vendor to screw up their kernels and the base kernel for an obscure (but fun) corner case. Thats not a rational choice is it. You want "performance is everything" you pay the price, don't make everyone suffer.
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