Messages in this thread | | | Subject | Re: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others | From | Peter Zijlstra <> | Date | Tue, 01 May 2012 17:11:43 +0200 |
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On Tue, 2012-05-01 at 15:12 +0300, Avi Kivity wrote: > We're now moving the freeing of kvm shadow page tables from using rcu to > using an irq-protected scheme like gup_fast(), because of the > performance differences. We didn't track it down but I expect the cause > is less reuse of cache-hot pages.
It would be good to understand these things.. just doing things because tends to come back and bite you :-)
If its cache behaviour you should be able to clearly see that using perf stat.
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