Messages in this thread | | | Date | Wed, 10 Sep 2014 11:27:44 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH] perf, x86: Fall back to vmalloc for BTS buffer allocation |
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> Note that since then we have actually fixed the 'cannot fault from NMI > context' thing, so we should be able to actually take those faults. I > suspect we can simply remove those WARNs from the vmalloc fault path, > but it would need double checking to see if there's no other reasons.
I think we actually need to use vmalloc_sync_all, because the PEBS/DS microcode may do the first access, and those lose events when the page is not present.
-Andi
-- ak@linux.intel.com -- Speaking for myself only
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