•Monitoring Function Calls

最新推荐文章于 2025-04-07 23:40:16 发布
最新推荐文章于 2025-04-07 23:40:16 发布
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​ LLMs之RL之CoT：《Monitoring Reasoning Models for Misbehavior and the Risks of Promoting Obfuscation》翻译与解读 目录 《Monitoring Reasoning Models for Misbehavior and the Risks of Promoting Obfuscation》翻译与解读 Abstract 1、Introduction Conclus
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简单的应用 一个简单的示例程序，实现一个异常类，这个异常类被抛出时记录了当时的调用栈信息。 /* show_bt.cpp */ #include #include #include #include using namespace std; class MyException { public: MyException(); virtual ~MyException()
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### BTFTrace Usage and Examples in Linux Tracing Tools BTF (BPF Type Format) enables more powerful and flexible tracing capabilities within the Linux kernel, especially when used with tools like `bpftrace`. This tool leverages eBPF technology along with BTF information to provide detailed insights into system operations. #### Basic Syntax of bpftrace The general syntax for using `bpftrace` is as follows: ```bash bpftrace [-v] [-d] {[-c command] | [-p PID]} script... ``` Where `-v` increases verbosity level; `-d` runs scripts but does not attach probes immediately; `-c` specifies a program or shell command followed by arguments that should be traced during execution; while `-p` attaches to existing processes specified by their process IDs. #### Example Scripts Using BTF Information To demonstrate how one might utilize BTF data through `bpftrace`, consider some practical examples below: ##### Monitoring System Calls Made By A Process This example shows monitoring all syscalls made by a specific application identified either via its name or PID. The output includes timestamps alongside each event captured. ```bash bpftrace -e 'tracepoint:syscalls:*_entry /comm=="nginx"/ { printf("%s %s\n", strftime("%H:%M:%S"), str(args->filename)); }' ``` Here, replace `"nginx"` with any other service running on your machine whose syscall activity you wish to monitor[^1]. ##### Tracking Memory Allocations Within Kernel Space Another useful scenario involves tracking memory allocations happening inside kernel space which can help identify potential leaks over time. ```bash bpftrace -e 'kprobe:vfs_read { @bytes = sum(arg0); } kretprobe:vfs_read /retval != 0/ {@reads = count();}' ``` In this case, two separate events are being tracked simultaneously – entry (`vfs_read`) and exit points from function calls related to file reading activities performed at low levels within VFS layer[^3]. ##### Analyzing Network Performance Metrics Per Interface For analyzing network performance metrics per interface, leveraging keywords such as `DEV`, `EDEV`, etc., provides valuable statistics about device-level errors among others. ```bash sudo sar -n DEV 1 5 ``` While technically outside direct interaction between user-space applications and kernel modules instrumented via eBPF/BTF interfaces, combining both approaches often yields comprehensive views across multiple dimensions relevant to troubleshooting complex issues involving networking stacks. --related questions-- 1. How do different types of probes work internally within bpftrace? 2. What kind of optimizations exist specifically targeting improved efficiency when deploying large-scale distributed systems relying heavily upon frequent instrumentation tasks? 3. Can we integrate custom logging mechanisms directly into our C/C++ programs so they emit structured metadata consumable by external analysis frameworks built around eBPF technologies?
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