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Date: Wed, 10 Aug 2011 20:16:17 +0100 From: Måns Rullgård <mans@...sr.com> To: linux-kernel@...r.kernel.org Subject: Re: [patch] perf: ARMv7 wrong "branches" generalized instruction Vince Weaver <vweaver1@...s.utk.edu> writes: > On Wed, 10 Aug 2011, Will Deacon wrote: > >> > It turns out the branches event used (ARMV7_PERFCTR_PC_WRITE) only seems >> > to count taken branches. >> >> It also counts exceptions and instructions that write to the PC. > > are those more common than not-taken branches? Every function return and every PLT call would fall in this category. > I'd think branch predictor statistics will be a bit off if only taken > instructions are measured. Clearly. -- Måns Rullgård mans@...sr.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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