如何在Linux内核中打印当前线程堆栈跟踪? [英] How to print the current thread stack trace inside the Linux kernel?

问题描述

我希望能够在Linux内核中打印线程的堆栈跟踪.

I would like to be able to print the stack trace of a thread in the Linux kernel.

详细信息:我想向特定函数(例如swap_writepage())添加代码，这些代码将打印调用此函数的线程的完整堆栈跟踪.像这样:

In details: I want to add code to specific functions (e.g. swap_writepage() ) that will print the complete stack trace of the thread where this function is being called. Something like this:

int swap_writepage(struct page *page, struct writeback_control *wbc)
{

    /* code goes here to print stack trace */

    int ret = 0;

    if (try_to_free_swap(page)) {
        unlock_page(page);
        goto out;
    }
    if (frontswap_store(page) == 0) {
        set_page_writeback(page);
        unlock_page(page);
        end_page_writeback(page);
        goto out;
    }
    ret = __swap_writepage(page, wbc, end_swap_bio_write);
out:
    return ret;
}

我的故事: 最近，Linux内核开发人员在改进用C编写的内核时开始采用面向对象的原理.由于C不是OO语言，所以事情开始变得非常丑陋和难以理解，更不用说没有像样的IDE了.分析C代码.而且我不想开始在调试器下运行Linux.注意:如果您是内核开发新手，并且想要在调试器下运行Linux，请不要付出任何努力……这将被证明是徒劳的(单步执行无济于事).

My story: Recently, Linux kernel developers started to adopt object-oriented principles when improving the kernel, which is written in C. Since C is not an OO languages things started to look very ugly and harder ti understand, let alone not having a decent IDE that can analyze C code. And I do not want to get started on running Linux under a debugger. Note: if you are a kernel development newb and want to run Linux under a debugger do not put efforts into that...it will prove to be fruitless (stepping makes no sense).

推荐答案

Linux内核具有众所周知的功能，称为dump_stack()

Linux kernel has very well known function called dump_stack() here, which prints the content of the stack. Place it in your function in according to see stack info.

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