Messages in this thread | | | Date | Fri, 14 Mar 2014 09:13:38 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 1/2] perf, x86: Disallow setting undefined bits for PEBS events |
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On Thu, Mar 13, 2014 at 02:22:12PM -0700, Andi Kleen wrote: > From: Andi Kleen <ak@linux.intel.com> > > The SDM forbids setting various event qualifiers with PEBS > events. The magic cycles:pp event uses it, but it has caused > problems in the past. We continue allowing it for cycles:pp, > but forbid it for all other events to follow the SDM.
Last time this came up I asked for what kind of problems it caused.
No answer then I think, and certainly no answer now.
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