定义一个TRACE_EVENT事件，通过调用ATRACE_BEGIN和ATRACE_END实现函数的跟跟踪

#include <linux/trace_events.h>

TRACE_EVENT(tracing_mark_write,
    TP_PROTO(int pid, const char *name, bool trace_begin),
    TP_ARGS(pid, name, trace_begin),
    TP_STRUCT__entry(
            __field(int, pid)
            __string(trace_name, name)
            __field(bool, trace_begin)
    ),
    TP_fast_assign(
            __entry->pid = pid;
            __assign_str(trace_name, name);
            __entry->trace_begin = trace_begin;
    ),
    TP_printk("%s|%d|%s", __entry->trace_begin ? "B" : "E",
        __entry->pid, __get_str(trace_name))
)

#define ATRACE_END(name) trace_tracing_mark_write(current->tgid, name, 0)
#define ATRACE_BEGIN(name) trace_tracing_mark_write(current->tgid, name, 1)