Linux perf子系统的使用(一)——计数 刚刚入职的时候我就研究了perf_event_open()这个巨无霸级别的系统调用,还用Python封装了一层,非常便于获取计数器。然而之后由于工作上一直直接用perf命令来获取各种计数器的值,于是就有所淡忘。又后来自己的笔记本重装,代码也不见了。最近由于需要开发一款略有复杂性的工具,对性能...
staticvoidsetup(void){inti;structperf_event_attrtsk_event,hw_event;/* * According toperf_event_open's manpage, the official way of * knowing ifperf_event_open() support is enabled is checking for * the existence of the file /proc/sys/kernel/perf_event_paranoid. */if(access("/proc/sy...
The read_format structure can take different forms depending on how the perf_event_attr structure is configured. Refer to the man page for more information. In addition to read_format, there is also the perf_event_attr structure which allows configuration of each of the 6 events. This is wh...
以ARM64为例,HW_BREAKPOINT_R、HW_BREAKPOINT_W以及HW_BREAKPOINT_RW对应的是数据断点,使用的是watchpoint,而HW_BREAKPOINT_X对应的是指令断电,使用的是breakpoint,具体可以参考find_slot_idx,可以参考ARM手册中ID_AA64DFR0_EL1的描述,其中记录了这两种硬件断点的个数,每种的数量介于2~16之间。 bp_addr (si...
WinRM Errors - wsmanfault access is denied WinRM is broken/corrupted, error code 2150858770 and more. Winrm quickconfig issues Witness Client failed to find a Witness Server WMI Error: 0x800706ba, The RPC server is unavailable WMI Event ID 5858 WMI for IIS: root\WebAdministration wmipr...