with echo 1 > options/display-graph # tracer: irqsoff # # irqsoff latency trace v1.1.5 on 4.20.0-rc6+ # --- # latency: 3751 us, #274/274, CPU#0 | (M:desktop VP:0, KP:0, SP:0 HP:0 #P:4) # --- # | task: bash-1507 (uid:0 nice:0 policy:0 rt_prio:0) # --- ...
Ftrace是Linux Kernel的官方tracing系统,支持Function trace、静态tracepoint、动态Tracepoint的跟踪,还提供各种Tracer,用于统计最大irq延迟、最大函数调用栈大小、调度事件等。 Ftrace还提供了强大的过滤、快照snapshot、实例(instance)等功能,可以灵活配置。 内核配置Ftrace后,如果功能不打开,对性能几乎没有影响。打开事件...
Ftrace 是一个内部跟踪器,通过tracer跟踪器帮助系统开发人员和设计人员查找内核内部发生的情况,实际上是几个分类跟踪实用程序的框架,功能有以下几个方面: 调试或分析用户空间之外发生的延迟和性能问题跟踪函数调用栈帧跟踪中断禁用和启用期间造成延迟的原因跟踪抢占以及从任务被唤醒到任务实际调度的时间之间发生的情况 ...
#defineATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER// 定义tags,这里属于pm类,就是抓systrace的时候:python systrace.py -o mynewtrace.html pm 所选择的pm类ATRACE_BEGIN("VoldNativeService::start");// 往/sys/kernel/debug/tracing/trace_marker文件写一个时间点ATRACE_END();// 结束的时候,又写一个时间点...
current trace and the next trace. '!' - greater than preempt_mark_thresh (default 100) '+' - greater than 1 microsecond ' ' - less than or equal to 1 microsecond. The rest is the same as the 'trace' file. trace_options
本文整理汇总了C++中FTRACE函数的典型用法代码示例。如果您正苦于以下问题:C++ FTRACE函数的具体用法?C++ FTRACE怎么用?C++ FTRACE使用的例子?那么, 这里精选的函数代码示例或许可以为您提供帮助。 在下文中一共展示了FTRACE函数的15个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您...
(); bash-1507 0d..1 3792us : <stack trace> => free_debug_processing => __slab_free => kmem_cache_free => vm_area_free => remove_vma => exit_mmap => mmput => begin_new_exec => load_elf_binary => search_binary_handler => __do_execve_file.isra.32 => __x64...
further tests and benchmarks. As an example, after this patch, kernel functions will have a single nop at function entry: <kernel_clone>: addis r2,r12,467 addi r2,r2,-16028 nop mfocrf r11,8 ... When ftrace is enabled, the nop is converted to an unconditional branch ...
Documentation / trace / ftrace.txt v6 v5 v4 v3 v3.19 v3.18 v3.17 v3.16 v3.15 v3.14 v3.13 v3.12 v3.11 v3.10 v3.9 v3.8 v3.7 v3.6 v3.5 v3.4 v3.3 v3.2 v3.2.102 v3.2.101 v3.2.100 v3.2.99 v3.2.98 v3.2.97 v3.2.96 v3.2.95 v3.2.94 v3.2.93 v3.2.92 ...
current trace and the next trace. '!' - greater than preempt_mark_thresh (default 100) '+' - greater than 1 microsecond ' ' - less than or equal to 1 microsecond. The rest is the same as the 'trace' file. trace_options