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 [off-list ref]:

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 <redacted>
Subject: Re: Debugging tool for Linux kernel and driver development
To: Teoh Choon Zone <redacted>
Cc: kernelnewbies <redacted>
Message-ID: [ref]
Content-Type: text/plain; charset=us-ascii

On Fri, Dec 02, 2016 at 03:27:01PM +0800, Teoh Choon Zone wrote:

quoted

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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