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Date:   Fri, 15 Oct 2021 10:21:22 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        ToastC <mrtoastcheng@...il.com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Felix Fietkau <nbd@....name>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Song Liu <songliubraving@...com>, Fabian Hemmer <copy@...y.sh>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Nicholas Fraser <nfraser@...eweavers.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Denys Zagorui <dzagorui@...co.com>,
        Wan Jiabing <wanjiabing@...o.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Changbin Du <changbin.du@...el.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Andrew Kilroy <andrew.kilroy@....com>
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 11/21] perf metric: Document the internal 'struct metric'

Add documentation as part of code tidying.

Acked-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/metricgroup.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index c96f9fe163f9..632867cedbae 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -117,14 +117,34 @@ struct metric_ref_node {
 	struct list_head list;
 };
 
+/**
+ * The metric under construction. The data held here will be placed in a
+ * metric_expr.
+ */
 struct metric {
 	struct list_head nd;
+	/**
+	 * The expression parse context importantly holding the IDs contained
+	 * within the expression.
+	 */
 	struct expr_parse_ctx *pctx;
+	/** The name of the metric such as "IPC". */
 	const char *metric_name;
+	/** The expression to parse, for example, "instructions/cycles". */
 	const char *metric_expr;
+	/**
+	 * The "ScaleUnit" that scales and adds a unit to the metric during
+	 * output.
+	 */
 	const char *metric_unit;
+	/** The list of metrics referenced by this one. */
 	struct list_head metric_refs;
+	/** The size of the metric_refs list. */
 	int metric_refs_cnt;
+	/**
+	 * Is there a constraint on the group of events? In which case the
+	 * events won't be grouped.
+	 */
 	bool has_constraint;
 };
 
-- 
2.33.0.1079.g6e70778dc9-goog

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