an online kernel crash book, and wondering what's deprecated

Ezequiel Garcia elezegarcia at
Thu Sep 27 06:18:45 EDT 2012

On Wed, Sep 26, 2012 at 8:33 AM, Robert P. J. Day <rpjday at> wrote:
>   in my online travels yesterday, i ran across this gem, "Linux Kernel
> Crash Book":
> and am now wondering about what would constitute a reasonable (and
> minimal?) list of canonical kernel debugging tools.
>   first, while the book above covers Linux Kernel Crash Dump (LKCD),
> the author freely admits that it's been pretty much obsoleted by the
> more recent and flexible kdump, so there seems to be little value in
> digging into LKCD (or, in my case, adding any coverage of it to a
> kernel debugging course, which i am currently designing).
>   next, someone else's course i'm teaching next week has a kernel
> debugging chapter which opens with netdump and diskdump before moving
> onto kdump and kexec, but those earlier utilities are *also*
> deprecated these days,
> so i would be tempted to skip any coverage of netdump and diskdump in
> favour of additional and more advanced coverage of kdump and kexec.
>   along those lines, i'm just digging into ftrace and was wondering if
> it in any way obsoleted systemtap, but i've heard from more than one
> source that while ftrace is allegedly more powerful, systemtap still
> has its place and is worth talking about.

While learning ftrace I found there's little good documentation for ftrace.
Ftrace is huge and very flexible, you can do lot more than just trace
your functions.

I firmly believe ftrace + perf should be consider like a serious
debugging technique.


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