linux-kernel - [OT] Re: [patch for 2.6.26 0/7] Architecture Independent Markers

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Message-ID: <47ECF3F9.4040906@redhat.com>
Date:	Fri, 28 Mar 2008 09:34:49 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	KOSAKI Motohiro <m-kosaki@...es.dti.ne.jp>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	Jim Keniston <jkenisto@...ibm.com>
Subject: [OT] Re: [patch for 2.6.26 0/7] Architecture Independent Markers

Ingo Molnar wrote:
> furthermore, and because it's Friday again, let me remind folks that 
> SystemTap has an even more significant bloat problem: the fact that it 
> needs a huge download:

Ingo, that seems very off-topic...

>  Installing:
>    kernel-debuginfo         x86_64     2.6.25-0.163.rc7.git1.fc9  
>    development-debuginfo  198 M
>  Installing for dependencies:
>    kernel-debuginfo-common  x86_64     2.6.25-0.163.rc7.git1.fc9  
>    development-debuginfo   30 M
> 
>  Total download size: 229 M
> 
> for _every_ updated kernel. That 229 MB size reduces the user base of 
> SystemTap (which is otherwise a totally brilliant and cool tool) to 1% 
> of its potential userbase, to those truly desperate persons who really 
> _need_ to get their problem debugged somehow. But it's nowhere near 
> usable as an easy, ad-hoc kernel instrumentation tool, just due to the 
> sheer size it brings.

Sure, it is a thorny issue especially for users of daily-kernel-updating
distribution.

However, when updating kernel from tarball, We can get full set of debuginfo
just by building kernel with CONFIG_DEBUG_INFO. I think it is enough
usable for kernel developers.

BTW, we already started working on the symbol-table based probing.
http://sources.redhat.com/bugzilla/show_bug.cgi?id=4311

> for heaven's sake, we can have 3 years of _full Linux kernel history_, 
> with all 87875 commits, with full changelog and dependencies and full 
> source code included, packed into a rather tight, 180 MB git repository 
> ...
> 
> [ and then i havent even begun about the on-disk footprint of this 
>   monstrum, after the packages have been installed: an additional 850 MB.
>   Puh-lease ... ]

Thank for Moore's law and all storage engineers, nowadays we can buy
an 1TB(=1000GB!) HDD with less than $300!(I also surprised...)
And many other compressed filesystem can be used for saving disk space.

Best regards,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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