Messages in this thread | | | Date | Wed, 10 Sep 2014 16:40:12 +0200 | From | Andi Kleen <> | Subject | Re: [PATCH] perf, x86: Fall back to vmalloc for BTS buffer allocation |
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> We did this once, and that blew up big time. > > Even now, vmalloc_fault() has a very explicit: > > WARN_ON_ONCE(in_nmi()); > > So this isn't going to happen until you fix that.
Good point.
We just need to call vmalloc_sync_all at allocation time, no need to change vmalloc_fault.
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
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