bcc-tools工具之profile

profile是用于追踪程序执行调用流程的工具，类似于perf中的-g指令

相比perf -g而言，profile功能化更加细分，可以根据需要选择追踪层面，例如-U（用户要调用流程） -K （内核态调用流程）

下面具体介绍该工具的使用

采用profile --help，我们可以看到如下介绍：

usage: profile [-h] [-p PID] [-U | -K] [-F FREQUENCY | -c COUNT] [-d] [-a]
               [-f] [--stack-storage-size STACK_STORAGE_SIZE] [-C CPU]
               [duration]

Profile CPU stack traces at a timed interval

positional arguments:
  duration              duration of trace, in seconds   # profile的持续时间

optional arguments:
  -h, --help            show this help message and exit
  -p PID, --pid PID     profile this PID only          # 只追踪该pid的调用流程
  -U, --user-stacks-only
                        show stacks from user space only (no kernel space
                        stacks)
  -K, --kernel-stacks-only
                        show stacks from kernel space only (no user space
                        stacks)
  -F FREQUENCY, --frequency FREQUENCY
                        sample frequency, Hertz
  -c COUNT, --count COUNT
                        sample period, number of events
  -d, --delimited       insert delimiter between kernel/user stacks
  -a, --annotations     add _[k] annotations to kernel frames
  -f, --folded          output folded format, one line per stack (for flame
                        graphs)
  --stack-storage-size STACK_STORAGE_SIZE
                        the number of unique stack traces that can be stored
                        and displayed (default 16384)
  -C CPU, --cpu CPU     cpu number to run profile on

examples:
    ./profile             # profile stack traces at 49 Hertz until Ctrl-C
    ./profile -F 99       # profile stack traces at 99 Hertz
    ./profile -c 1000000  # profile stack traces every 1 in a million events
    ./profile 5           # profile at 49 Hertz for 5 seconds only
    ./profile -f 5        # output in folded format for flame graphs
    ./profile -p 185      # only profile threads for PID 185
    ./profile -U          # only show user space stacks (no kernel)
    ./profile -K          # only show kernel space stacks (no user)

标签：profile,kernel,space,stack,only,bcc,tools,stacks
来源： https://www.cnblogs.com/haoxing990/p/12079363.html