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Subject[PATCH 02/37] perf intel-pt: Add default config for pass-through branch enable
Date
Branch tracing is enabled by default, so a fake config bit called 'pt'
(pass-through) was added to allow the 'branch enable' bit to have affect.
Add default config 'pt,branch' which will allow users to disable branch
tracing using 'branch=0' instead of having to specify 'pt,branch=0'.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/arch/x86/util/intel-pt.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index f630de0206a1..007621a7e420 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -196,6 +196,7 @@ static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
int psb_cyc, psb_periods, psb_period;
int pos = 0;
u64 config;
+ char c;

pos += scnprintf(buf + pos, sizeof(buf) - pos, "tsc");

@@ -229,6 +230,10 @@ static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
}
}

+ if (perf_pmu__scan_file(intel_pt_pmu, "format/pt", "%c", &c) == 1 &&
+ perf_pmu__scan_file(intel_pt_pmu, "format/branch", "%c", &c) == 1)
+ pos += scnprintf(buf + pos, sizeof(buf) - pos, ",pt,branch");
+
pr_debug2("%s default config: %s\n", intel_pt_pmu->name, buf);

intel_pt_parse_terms(&intel_pt_pmu->format, buf, &config);
--
1.9.1
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