tracepoint_probe_register_prio tracepoint_add_func TP点的激活通过tracepoint_probe_register函数,将trace_event_class_[name]中的probe函数传入,并开启TP跟踪开关,最终TP点会调用到trace_event_raw_event_[name]中。 实战演练 目标:统计brk系统调用发生时的参数 (该效果通过已有的syscall也能实现)。 TracePoint ...
当需要获取内核的debug信息时,通常你会通过以下printk的方式打印信息: voidtrace_func(){//……printk("输出信息");//……} 缺点: 内核中printk是统一控制的,各个模块的printk都会被打印,无法只打印需要关注的模块 如果需要修改/新增打印信息,需要修改所有受影响的printk语句。这些printk分散在代码多处,每个地方都需...
tracepoint{constchar*name;/* Tracepoint name */structstatic_keykey;int(*regfunc)(void);void(*unregfunc)(void);structtracepoint_func__rcu*funcs;}; name:Tracepoint的名字,内核中通过hash表管理所有的trace point,找到对应的hash slot后,需要通过name来识别具体的trace point key:Tracepoint状态,1表示di...
voidtrace_func(){//……printk("输出信息");//……} 缺点: 内核中printk是统一控制的,各个模块的printk都会被打印,无法只打印需要关注的模块 如果需要修改/新增打印信息,需要修改所有受影响的printk语句。这些printk分散在代码多处,每个地方都需要修改 嵌入式系统中,如果printk信息量大,console(如果有)有大量的打...
add TracePoint#callee_id. [ruby-core:77241] [Feature #12747] * cont.c, eval.c, gc.c, include/ruby/intern.h, insns.def, thread.c, vm.c, vm_backtrace.c, vm_core.h, vm_eval.c, vm_insnhelper.c, vm_trace.c: ditto. * test/ruby/test_settracefunc.rb: tests for above. git-sv...
546 87 #9 0x00000000006979e6 in captured_main (data=) at ../../src/gdb/main.c:1001 #10 0x0000000000695d8b in catch_errors (func=0x697360 , func@entry=, func_args=0x7fff08afd5b0, func_args@entry=, errstring=, errstring@entry=, mask=, mask@entry=) at ../../src/gdb/...
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=nil{log.Fatalf("opening perf reader: %s",err)}deferrd.Close()stopper:=make(chanos.Signal,1)signal.Notify(stopper,os.Interrupt,syscall.SIGTERM)gofunc(){<-stopperiferr:=rd.Close();err!=nil{log.Fatalf("closing ringbuf reader: %s",err)}}()log.Println("Waiting for events..")varevent...
link""github.com/cilium/ebpf/rlimit""golang.org/x/sys/unix")//go:generate go run github.com/cilium/ebpf/cmd/bpf2go -target amd64 -cc clang -cflags "-O2 -g -D__TARGET_ARCH_x86 -D__KERNEL__ -DDEBUG -I/usr/include" write ../../bpf/write.cfuncmain() {err:=rlimit.Remove...
tracepoint*tp,void*probe,void*data,intprio){structtracepoint_functp_func;intret;mutex_lock(&tracepoints_mutex);tp_func.func=probe;tp_func.data=data;tp_func.prio=prio;ret=tracepoint_add_func(tp,&tp_func,prio,false);mutex_unlock(&tracepoints_mutex);returnret;}staticinttracepoint_add_func...