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我想malloc在fedora 中用Kprobe 计算系统调用。我知道这malloc不是系统调用,而是在用户空间中实现的,但如果可能的话,我想用 kprobe 来计算 malloc。

我必须给 Kprobe 的系统调用的名称是什么?例如对于 do_work:

kp.addr = (kprobe_opcode_t *) kallsyms_lookup_name("do_fork");
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这对于 kprobes 是不可能的,因为正如您所说,malloc它不是系统调用。

但是,您可以使用 USDT 来跟踪用户空间进程。密件抄送工具包含一个带有uobjnew. 它跟踪给定进程中的对象分配:

$ ./uobjnew -h
usage: uobjnew.py [-h] [-l {java,ruby,c}] [-C TOP_COUNT] [-S TOP_SIZE] [-v]
                  pid [interval]

Summarize object allocations in high-level languages.

positional arguments:
  pid                   process id to attach to
  interval              print every specified number of seconds

optional arguments:
  -h, --help            show this help message and exit
  -l {java,ruby,c}, --language {java,ruby,c}
                        language to trace
  -C TOP_COUNT, --top-count TOP_COUNT
                        number of most frequently allocated types to print
  -S TOP_SIZE, --top-size TOP_SIZE
                        number of largest types by allocated bytes to print
  -v, --verbose         verbose mode: print the BPF program (for debugging
                        purposes)

examples:
    ./uobjnew -l java 145         # summarize Java allocations in process 145
    ./uobjnew -l c 2020 1         # grab malloc() sizes and print every second
    ./uobjnew -l ruby 6712 -C 10  # top 10 Ruby types by number of allocations
    ./uobjnew -l ruby 6712 -S 10 # top 10 Ruby types by total size
于 2017-11-08T13:02:31.797 回答