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ARC: perf: map generic branches to correct hardware condition 

So far we've mapped branches to "ijmp" which also counts conditional
branches NOT taken. This makes us different from other architectures
such as ARM which seem to be counting only taken branches.

So use "ijmptak" hardware condition which only counts (all jump
instructions that are taken)

'ijmptak' event is available on both ARCompact and ARCv2 ISA based
cores.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Cc: stable@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: reworked changelog]
This commit is contained in:
Eugeniy Paltsev 2018-12-17 12:54:23 +03:00 committed by Vineet Gupta
parent a3010a0465
commit 3affbf0e15
1 changed files with 2 additions and 1 deletions
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3
arch/arc/include/asm/perf_event.h
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@ -103,7 +103,8 @@ static const char * const arc_pmu_ev_hw_map[] = {
/* counts condition */ /* counts condition */
[PERF_COUNT_HW_INSTRUCTIONS] = "iall", [PERF_COUNT_HW_INSTRUCTIONS] = "iall",
[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = "ijmp", /* Excludes ZOL jumps */ /* All jump instructions that are taken */
[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = "ijmptak",
[PERF_COUNT_ARC_BPOK] = "bpok", /* NP-NT, PT-T, PNT-NT */ [PERF_COUNT_ARC_BPOK] = "bpok", /* NP-NT, PT-T, PNT-NT */
#ifdef CONFIG_ISA_ARCV2 #ifdef CONFIG_ISA_ARCV2
[PERF_COUNT_HW_BRANCH_MISSES] = "bpmp", [PERF_COUNT_HW_BRANCH_MISSES] = "bpmp",