Messages in this thread | | | Date | Wed, 20 Mar 2002 18:15:10 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: Scalability problem (kmap_lock) with -aa kernels |
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My guess: persistent kmaps are okay, kmapped high pagetables are okay, persistent kmapped high pagetables are okay. What's wrong is how we flush_all_zero_pkmaps on all cpus, synchronously while holding the kmap_lock everyone needs to get a new kmap (and hopefully more often, just inc or dec the pkmap_count of kmap already got). That's what cries out for redesign: it's served us well but should now be improved.
Hugh
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