truss和strace用来跟踪一个进程的系统调用或信号产生的情况,而 ltrace用来跟踪进程调用库函数的情况。truss是早期为System V R4开发的调试程序,包括Aix、FreeBSD在内的大部分Unix系统都自带了这个工具;而strace最初是为SunOS系统编写的,ltrace最早出现在GNU/Debian Linux中。这两个工具现在也已被移植到了大部分Unix系统...
This is a graphical viewer for the Ftrace and Perf events that can be captured by the Linux kernel. It visualizes the following events: cpu_frequency cpu_idle sched_migrate_task sched_process_exit sched_process_fork sched_switch sched_wakeup sched_wakeup_new sched_waking ...
A callchain may be found in sched_switch and a time slice in stat_iowait, so I add handler in perf inject for merging this events. My code saves sched_switch event for each process and when it meets stat_iowait, it reports the sched_switch event, because this event contains a correct...
A ghost record is the result of a delete operation. When you delete a record, the deleted record is kept as a ghost record. Later, the deleted record is purged by the ghost record removal process. When you disable this process, the deleted record isn't purged. Therefore, the space that...
strace 常用来跟踪进程执行时的系统调用和所接收的信号。在Linux 世界,进程不能直接访问硬件设备,当进程需要访问硬件设备(比如读取磁盘文件,接收网络数据等等)时,必须由用户态模式切换至内核态模式,通过系统调用访问硬件设备。strace 可以跟踪到一个进程产生的系统调用,包括参数,返回值,执行消耗的时间。
# tracer: function_graph # # CPU TASK/PID DURATION FUNCTION CALLS # | | | | | | | | | 0) sh-4802 | | d_free() { 0) sh-4802 | | call_rcu() { 0) sh-4802 | | __call_rcu() { 0) sh-4802 | 0.616 us | rcu_process_gp_end(); 0) sh-4802 | 0.586 us | check_fo...
自 Linux v5.5-rc1 起,它们在上游可用。...lmkd 发出一个名为kill_one_process 的用户空间atrace 计数器事件。...atrace_apps: "lmkd" # This is not strictly required but is useful to know the state App Launch Time Measurement 注:下面代码中的Trace.asyncTraceBegin和Trace.asyncTraceEnd实际上会...
This is the time each recording process will sleep before waking up to record any new data that was written to the ring buffer. -r priority The priority to run the capture threads at. In a busy system the trace capturing threads may be staved and events can be lost. This increases the...
内核头文件include/linux/kernel.h中描述了ftrace提供的工具函数的原型,这些函数包括trace_printk、tracing_on/tracing_off等。 3.4 引入用户态ltrace和strace 3.4.1 ltrace 跟踪进程调用C库函数的情况。 常用的参数: -a : 对齐具体某个列的返回值。-c : 计算时间和调用,并在程序退出时打印摘要。-d : 打印调试...
Tracing a build on Linux TraceCode is a tool to analyze the traced execution of a build, so you can learn which files are built into binaries and ultimately deployed in your distributed software. This TraceCode toolkit uses strace to capture the system-level trace of a build and can reconst...