linux-kernel - [patch] perf_event DRAM RAPL uses wrong units on Broadwell-EP

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Date:   Tue, 2 May 2017 14:08:50 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     linux-kernel@...r.kernel.org
cc:     Stephane Eranian <eranian@...il.com>,
        Kan Liang <kan.liang@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: [patch] perf_event DRAM RAPL uses wrong units on Broadwell-EP


It appears as though the Broadwell-EP DRAM units share the special 
units quirk with Haswell-EP/KNL.

Without this patch, you get really high results (a single DRAM using 20W 
of power).

The powercap driver in drivers/powercap/intel_rapl.c already has this 
change.

Signed-off-by: Vince Weaver <vincent.weaver@...ne.edu>

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index 9d05c7e67f60..a45e2114a846 100644
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -761,7 +761,7 @@ static const struct x86_cpu_id rapl_cpu_match[] __initconst = {
 
 	X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_CORE,   hsw_rapl_init),
 	X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_GT3E,   hsw_rapl_init),
-	X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_X,	  hsw_rapl_init),
+	X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_X,	  hsx_rapl_init),
 	X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_XEON_D, hsw_rapl_init),
 
 	X86_RAPL_MODEL_MATCH(INTEL_FAM6_XEON_PHI_KNL, knl_rapl_init),