Re: [PATCH] perf, x86: Fall back to vmalloc for BTS buffer allocation

[Andi Kleen]

> 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@xxxxxxxxxxxxxxx -- Speaking for myself only
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