linux-kernel - [PATCH v2 10/16] perf timechart: Make large arrays dynamic

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Date:   Fri, 26 May 2023 11:33:55 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        Ross Zwisler <zwisler@...omium.org>,
        Leo Yan <leo.yan@...aro.org>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Yang Jihong <yangjihong1@...wei.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v2 10/16] perf timechart: Make large arrays dynamic

Allocate start time and state arrays when command starts rather than
using 114,688 bytes in .bss.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-timechart.c | 48 +++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 9 deletions(-)

diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index bce1cf896f9c..829d99fecfd0 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -315,10 +315,10 @@ static void pid_put_sample(struct timechart *tchart, int pid, int type,
 
 #define MAX_CPUS 4096
 
-static u64 cpus_cstate_start_times[MAX_CPUS];
-static int cpus_cstate_state[MAX_CPUS];
-static u64 cpus_pstate_start_times[MAX_CPUS];
-static u64 cpus_pstate_state[MAX_CPUS];
+static u64 *cpus_cstate_start_times;
+static int *cpus_cstate_state;
+static u64 *cpus_pstate_start_times;
+static u64 *cpus_pstate_state;
 
 static int process_comm_event(struct perf_tool *tool,
 			      union perf_event *event,
@@ -1981,12 +1981,34 @@ int cmd_timechart(int argc, const char **argv)
 		"perf timechart record [<options>]",
 		NULL
 	};
+	int ret;
+
+	cpus_cstate_start_times = calloc(MAX_CPUS, sizeof(*cpus_cstate_start_times));
+	if (!cpus_cstate_start_times)
+		return -ENOMEM;
+	cpus_cstate_state = calloc(MAX_CPUS, sizeof(*cpus_cstate_state));
+	if (!cpus_cstate_state) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	cpus_pstate_start_times = calloc(MAX_CPUS, sizeof(*cpus_pstate_start_times));
+	if (!cpus_pstate_start_times) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	cpus_pstate_state = calloc(MAX_CPUS, sizeof(*cpus_pstate_state));
+	if (!cpus_pstate_state) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
 	argc = parse_options_subcommand(argc, argv, timechart_options, timechart_subcommands,
 			timechart_usage, PARSE_OPT_STOP_AT_NON_OPTION);
 
 	if (tchart.power_only && tchart.tasks_only) {
 		pr_err("-P and -T options cannot be used at the same time.\n");
-		return -1;
+		ret = -1;
+		goto out;
 	}
 
 	if (argc && strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
@@ -1996,17 +2018,25 @@ int cmd_timechart(int argc, const char **argv)
 
 		if (tchart.power_only && tchart.tasks_only) {
 			pr_err("-P and -T options cannot be used at the same time.\n");
-			return -1;
+			ret = -1;
+			goto out;
 		}
 
 		if (tchart.io_only)
-			return timechart__io_record(argc, argv);
+			ret = timechart__io_record(argc, argv);
 		else
-			return timechart__record(&tchart, argc, argv);
+			ret = timechart__record(&tchart, argc, argv);
+		goto out;
 	} else if (argc)
 		usage_with_options(timechart_usage, timechart_options);
 
 	setup_pager();
 
-	return __cmd_timechart(&tchart, output_name);
+	ret = __cmd_timechart(&tchart, output_name);
+out:
+	zfree(&cpus_cstate_start_times);
+	zfree(&cpus_cstate_state);
+	zfree(&cpus_pstate_start_times);
+	zfree(&cpus_pstate_state);
+	return ret;
 }
-- 
2.41.0.rc0.172.g3f132b7071-goog