Some guys are likely to prefer complex tools, but I'm a simple guy. My first try at debugging is printing. Using pr_debug is not always possible so ftrace and early printk may be useful. Another tool that comes with kernel and that is amazing is perf. You may find undercover bottlenecks with this one. Really really useful. Being able to read kernel stack traces is a good skill too,, I tried kgdb over serial at some embedded system. Apparently the serial driver was not capable of running kgdb.. Some polling mechanism was needed, but not implemented.. at least, this was written at some forum and I didn't do further investigation... Here are some links: http://elinux.org/Debugging_by_printing https://www.kernel.org/doc/Documentation/trace/ftrace.txt https://perf.wiki.kernel.org/index.php/Tutorial http://www.dedoimedo.com/computers/crash-book.html Regards, 2016-12-03 16:46 GMT-02:00 John Smith <PR2723@hotmail.com>:
Hi Andrey,
Can you help post some good/still relevant links? Call me stupid, I did google, found a few websites, and most of them are kind of out of contexts(don't know how to follow). For beginners, step-by-step tutorials are the best. so far, sounds like kgdb is promising, but it requires a lot of backgrounds to start with. I still have not figured out the exact steps.
Thank you,
Message: 1 Date: Fri, 2 Dec 2016 23:15:44 +0000 From: Andrey Utkin <andrey_utkin@fastmail.com> Subject: Re: Debugging tool for Linux kernel and driver development To: Teoh Choon Zone <choon-zone.teoh@vie.com.my> Cc: kernelnewbies <kernelnewbies@kernelnewbies.org> Message-ID: <20161202231544.GB23301@dell-m4800.home> Content-Type: text/plain; charset=us-ascii
On Fri, Dec 02, 2016 at 03:27:01PM +0800, Teoh Choon Zone wrote:
What are some widely used industrial tools (software/ hardware) for debugging Linux kernel and driver? Recently my company allocate a budget for purchasing this kind of tools, so I would like what are the tools that would greatly ease our development.
You'd better budget some time to google a bit and watch conference videos showing debugging techniques :) There are fine videos from past Kernel Recipes conferences.
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