Messages in this thread | | | Date | Wed, 22 Feb 2006 11:52:03 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH] remove zone_mem_map |
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Andrew Morton wrote: > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote: >> This patch removes zone_mem_map from zone. >> By this, (generic) page_to_pfn and pfn_to_page can use the same logic. > > I assume this is dependent upon unify-pfn_to_page-*.patch? > yes. sorry for forgetting to write it.
>> This modifies page_to_pfn implementation. Could anyone do performance test on NUMA ? > > Do you expect there to be NUMA performance problems? If so, how do they > arise and what sort of tests should be run? > I don't expect it. But when I posted this before (as RFC), some persons (Martin J. Bligh and Dave Hansen) had concerns about it.
I think the heaviest users of page_to_pfn() are the page allocator and mk_pte(page_to_pfn(page), hogehoge).
So, tests like "mmap -> touch all -> unmap" will be good test.
powerpc and ia64 is not a good test environment, because they don't use page_to_pfn() of generic DISCONTIG definitions.
other NUMAs (i386, x86_64 etc..) will be good.
Thanks, -- Kame
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