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)