Messages in this thread | | | Date | Thu, 3 Dec 2015 22:28:33 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 1/2] x86, perf: Remove warning for zero PEBS status |
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On Thu, Dec 03, 2015 at 01:22:19PM -0800, Andi Kleen wrote: > From: Andi Kleen <ak@linux.intel.com> > > The recent change 75f80859b1 (... Robustify PEBS buffer drain) > causes lots of warnings on different CPUs before Skylake > when running PEBS intensive workloads. > > They can have a zero status field in the PEBS record when > PEBS is racing with clearing of GLOBAl_STATUS.
Ah, so _that_ is the explanation! Please put that in a comment near that code. This has long puzzled me.
Thanks for digging into that.
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