From: Vince Weaver <[email protected]>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 1996388e9f4e3444db8273bc08d25164d2967c21 upstream.
This was discussed back in February:
https://lkml.org/lkml/2014/2/18/956
But I never saw a patch come out of it.
On IvyBridge we share the SandyBridge cache event tables, but the
dTLB-load-miss event is not compatible. Patch it up after
the fact to the proper DTLB_LOAD_MISSES.DEMAND_LD_MISS_CAUSES_A_WALK
Signed-off-by: Vince Weaver <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link:
http://lkml.kernel.org/r/alpine.deb.2.11.1407141528200.17...@vincent-weaver-1.umelst.maine.edu
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
---
arch/x86/kernel/cpu/perf_event_intel.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c
b/arch/x86/kernel/cpu/perf_event_intel.c
index aa4b5c132c66..959bbf204dae 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -2413,6 +2413,9 @@ __init int intel_pmu_init(void)
case 62: /* IvyBridge EP */
memcpy(hw_cache_event_ids, snb_hw_cache_event_ids,
sizeof(hw_cache_event_ids));
+ /* dTLB-load-misses on IVB is different than SNB */
+ hw_cache_event_ids[C(DTLB)][C(OP_READ)][C(RESULT_MISS)] =
0x8108; /* DTLB_LOAD_MISSES.DEMAND_LD_MISS_CAUSES_A_WALK */
+
memcpy(hw_cache_extra_regs, snb_hw_cache_extra_regs,
sizeof(hw_cache_extra_regs));
--
2.1.2
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