Initial Commit

tracepoint.c.bkp

@@ -0,0 +1,40 @@
+//go:build ignore
+
+#include "common.h"
+
+char __license[] SEC("license") = "Dual MIT/GPL";
+
+struct {
+	__uint(type, BPF_MAP_TYPE_ARRAY);
+	__type(key, u32);
+	__type(value, u64);
+	__uint(max_entries, 1);
+} counting_map SEC(".maps");
+
+// This struct is defined according to the following format file:
+// /sys/kernel/tracing/events/kmem/mm_page_alloc/format
+struct alloc_info {
+	/* The first 8 bytes is not allowed to read */
+	unsigned long pad;
+
+	unsigned long pfn;
+	unsigned int order;
+	unsigned int gfp_flags;
+	int migratetype;
+};
+
+// This tracepoint is defined in mm/page_alloc.c:__alloc_pages_nodemask()
+// Userspace pathname: /sys/kernel/tracing/events/kmem/mm_page_alloc
+SEC("tracepoint/kmem/mm_page_alloc")
+int mm_page_alloc(struct alloc_info *info) {
+	u32 key     = 0;
+	u64 initval = 1, *valp;
+
+	valp = bpf_map_lookup_elem(&counting_map, &key);
+	if (!valp) {
+		bpf_map_update_elem(&counting_map, &key, &initval, BPF_ANY);
+		return 0;
+	}
+	__sync_fetch_and_add(valp, 1);
+	return 0;
+}