Messages in this thread | | | Date | Wed, 10 Sep 2014 18:35:56 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] perf, x86: Fall back to vmalloc for BTS buffer allocation |
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On Wed, Sep 10, 2014 at 04:40:12PM +0200, Andi Kleen wrote: > > 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.
Somehow that wasn't considered adequate, but lemme try and dig out that thread. It should be somewhere...
https://lkml.org/lkml/2010/7/14/465
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