linux-kernel - [PATCH V2 09/11] perf intel-pt: Use CLOCK_PERF_HW_CLOCK

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Date:   Mon, 14 Feb 2022 13:09:12 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        kvm@...r.kernel.org, H Peter Anvin <hpa@...or.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Leo Yan <leo.yan@...aro.org>
Subject: [PATCH V2 09/11] perf intel-pt: Use CLOCK_PERF_HW_CLOCK_NS by default

Make CLOCK_PERF_HW_CLOCK_NS the default for Intel PT if it is supported.
To allow that to be overridden, support also --no-clockid.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/arch/x86/util/intel-pt.c | 6 ++++++
 tools/perf/util/clockid.c           | 1 +
 tools/perf/util/record.h            | 1 +
 3 files changed, 8 insertions(+)

diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index 5424c42337e7..bba55b6f75b6 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -927,6 +927,12 @@ static int intel_pt_recording_options(struct auxtrace_record *itr,
 		evsel__reset_sample_bit(tracking_evsel, BRANCH_STACK);
 	}
 
+	if (!opts->use_clockid && !opts->no_clockid && perf_can_perf_clock_hw_clock_ns()) {
+		opts->use_clockid = true;
+		opts->ns_clockid = true;
+		opts->clockid = CLOCK_PERF_HW_CLOCK_NS;
+	}
+
 	/*
 	 * Warn the user when we do not have enough information to decode i.e.
 	 * per-cpu with no sched_switch (except workload-only).
diff --git a/tools/perf/util/clockid.c b/tools/perf/util/clockid.c
index 2fcffee690e1..f9c0200e1ec2 100644
--- a/tools/perf/util/clockid.c
+++ b/tools/perf/util/clockid.c
@@ -81,6 +81,7 @@ int parse_clockid(const struct option *opt, const char *str, int unset)
 
 	if (unset) {
 		opts->use_clockid = 0;
+		opts->no_clockid = true;
 		return 0;
 	}
 
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index 1dbbf6b314dc..9a1dabfd158b 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -68,6 +68,7 @@ struct record_opts {
 	int	      initial_delay;
 	bool	      use_clockid;
 	bool	      ns_clockid;
+	bool	      no_clockid;
 	clockid_t     clockid;
 	u64	      clockid_res_ns;
 	int	      nr_cblocks;
-- 
2.25.1