diff --git a/observation/src/llcstat/llcstat.c b/observation/src/llcstat/llcstat.c
new file mode 100644
index 0000000000000000000000000000000000000000..f213c15ba8ebad84627f104fc0cf3d6b20d9d738
--- /dev/null
+++ b/observation/src/llcstat/llcstat.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+#include "commons.h"
+#include <linux/perf_event.h>
+#include <sys/syscall.h>
+#include <sys/param.h>
+#include "llcstat.h"
+#include "llcstat.skel.h"
+#include "btf_helpers.h"
+#include "trace_helpers.h"
+
+struct env {
+	int sample_period;
+	time_t duration;
+	bool verbose;
+	bool per_thread;
+} env = {
+	.sample_period = 100,
+	.duration = 10,
+};
+
+static volatile sig_atomic_t exiting;
+
+const char *argp_program_version = "llcstat 0.1";
+const char *argp_program_bug_address = "Jackie Liu <liuyun01@kylinos.cn>";
+const char argp_program_doc[] =
+"Summarize cache references and misses by PID.\n"
+"\n"
+"USAGE: llcstat [--help] [-c SAMPLE_PERIOD] [duration]\n";
+
+static const struct argp_option opts[] = {
+	{ "sample_period", 'c', "SAMPLE_PERIOD", 0, "Sample one in this many "
+	  "number of cache reference / miss events" },
+	{ "verbose", 'v', NULL, 0, "Verbose debug output" },
+	{ "tid", 't', NULL, 0,
+	  "Summarize cacge references and misses by PID/TTID" },
+	{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
+	{},
+};