Messages in this thread | | | Date | Thu, 29 Apr 1999 19:43:25 -0400 (EDT) | From | Jim Zelenka <> | Subject | Re: Process VM Addr to Kernel VM Addr at Interrupt Time. |
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Excerpts from internet.computing.linux-kernel: 29-Apr-99 Re: Process VM Addr to Kern.. Ralf Baechle@uni-koblenz (619*)
> Also these multiple mappings are going to make machines with virtual indexed > caches barf when implemented wrongly. Suggestion: KISS. Use a kernel > bounce buffer and escape the gadzillion of possible mm traps.
Even if one is willing to buy into the overhead this introduces (and contrary to what some folks have asserted, byte copies are _far_ from free, and can cause major performance issues), the limit on the amount of memory one can allocate contiguously makes this solution impractical.
-Jim.Zelenka@cs.cmu.edu Senior Research Programmer CMU/SCS Parallel Data Lab http://www.pdl.cs.cmu.edu/PEOPLE/jimz.html
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