Messages in this thread | | | Date | Tue, 22 Nov 2011 00:32:55 +0100 | From | Andi Kleen <> | Subject | Re: [PATCH 5/8] readahead: add /debug/readahead/stats |
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> I may be wrong, but I don't think the CPU cost of this code matters a > lot. People will rarely turn it on and disk IO is a lot slower than > CPU actions and it's waaaaaaay more important to get high-quality info > about readahead than it is to squeeze out a few CPU cycles.
In its current form it would cache line bounce, which tends to be extremly slow. But the solution is probably to make it per CPU.
-Andi
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