Messages in this thread | | | Date | Thu, 26 Jun 2008 07:02:15 +0100 (IST) | From | Dave Airlie <> | Subject | Re: kmap_atomic_pfn for PCI BAR access? |
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> > > > Anything that does any kind of pagetable manipulation needs to do tlb flushes. > kunmap_atomic handles the flushing.
It doesn't however need to do an IPI dance which is the worst part of doing a tlb flush on SMP machines.
flushing local CPU tlbs is bad, but doing IPIs and waiting for everyone else is brutal.
Dave.
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