I would like to be able to print the stack trace of a thread in the Linux kernel.
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;
}
@rakib is exactly right of course.
In addition, I'd like to point out that one can define simple and elegant macros that help print debug info as and when required. Over the years, I've put these macros and conveneince routines into a header file; you can check it out and download it here: "A Header of Convenience".
There are macros / functions to:
Whew :-)