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perf/x86: Add conditional branch filtering support
This patch adds conditional branch filtering support, enabling it for PERF_SAMPLE_BRANCH_COND in perf branch stack sampling framework by utilizing an available software filter X86_BR_JCC. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Reviewed-by: Stephane Eranian <eranian@google.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: mpe@ellerman.id.au Cc: benh@kernel.crashing.org Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1400743210-32289-3-git-send-email-khandual@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -384,6 +384,9 @@ static void intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
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if (br_type & PERF_SAMPLE_BRANCH_NO_TX)
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mask |= X86_BR_NO_TX;
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if (br_type & PERF_SAMPLE_BRANCH_COND)
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mask |= X86_BR_JCC;
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/*
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* stash actual user request into reg, it may
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* be used by fixup code for some CPU
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@ -678,6 +681,7 @@ static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = {
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* NHM/WSM erratum: must include IND_JMP to capture IND_CALL
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*/
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[PERF_SAMPLE_BRANCH_IND_CALL] = LBR_IND_CALL | LBR_IND_JMP,
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[PERF_SAMPLE_BRANCH_COND] = LBR_JCC,
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};
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static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = {
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@ -689,6 +693,7 @@ static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = {
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[PERF_SAMPLE_BRANCH_ANY_CALL] = LBR_REL_CALL | LBR_IND_CALL
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| LBR_FAR,
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[PERF_SAMPLE_BRANCH_IND_CALL] = LBR_IND_CALL,
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[PERF_SAMPLE_BRANCH_COND] = LBR_JCC,
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};
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/* core */
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