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12-profile/profile.bpf.c

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+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright (c) 2022 Meta Platforms, Inc. */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+
+#include "profile.h"
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
+
+struct {
+	__uint(type, BPF_MAP_TYPE_RINGBUF);
+	__uint(max_entries, 256 * 1024);
+} events SEC(".maps");
+
+SEC("perf_event")
+int profile(void *ctx)
+{
+	int pid = bpf_get_current_pid_tgid() >> 32;
+	int cpu_id = bpf_get_smp_processor_id();
+	struct stacktrace_event *event;
+	int cp;
+
+	event = bpf_ringbuf_reserve(&events, sizeof(*event), 0);
+	if (!event)
+		return 1;
+
+	event->pid = pid;
+	event->cpu_id = cpu_id;
+
+	if (bpf_get_current_comm(event->comm, sizeof(event->comm)))
+		event->comm[0] = 0;
+
+	event->kstack_sz = bpf_get_stack(ctx, event->kstack, sizeof(event->kstack), 0);
+
+	event->ustack_sz = bpf_get_stack(ctx, event->ustack, sizeof(event->ustack), BPF_F_USER_STACK);
+
+	bpf_ringbuf_submit(event, 0);
+
+	return 0;
+}

12-profile/profile.h

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+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* Copyright (c) 2022 Meta Platforms, Inc. */
+#ifndef __PROFILE_H_
+#define __PROFILE_H_
+
+#ifndef TASK_COMM_LEN
+#define TASK_COMM_LEN 16
+#endif
+
+#ifndef MAX_STACK_DEPTH
+#define MAX_STACK_DEPTH         128
+#endif
+
+typedef __u64 stack_trace_t[MAX_STACK_DEPTH];
+
+struct stacktrace_event {
+	__u32 pid;
+	__u32 cpu_id;
+	char comm[TASK_COMM_LEN];
+	__s32 kstack_sz;
+	__s32 ustack_sz;
+	stack_trace_t kstack;
+	stack_trace_t ustack;
+};
+
+#endif /* __PROFILE_H_ */