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Re: [patch for 2.6.26 0/7] Architecture Independent Markers

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To: Ingo Molnar <mingo@...>
Cc: KOSAKI Motohiro <m-kosaki@...>, Mathieu Desnoyers <mathieu.desnoyers@...>, <akpm@...>, <linux-kernel@...>, Linus Torvalds <torvalds@...>
Date: Friday, March 28, 2008 - 9:40 am

>> >  NACK-ed-by: Ingo Molnar <mingo@elte.hu>

Frankly, the "problem" has not yet been established.  Ingo has failed
to respond to Mathieu's analysis of the actual instruction streams,
which cast doubt on Ingo's technique of simply counting bytes.  So
far, neither Ingo nor Mathieu have published *time measurements* to
quantify the actual (as opposed to speculated) costs.



It's a problem, and there are a few improvements under way or being
contemplated:

- compression of the DWARF data to eliminate more duplication
- support for inserting probes only on function entry/exit points
  without debugging data - relying on symbol tables and raw ABI
- a networked service to allow one machine to serve site-wide
  systemtap needs

At the end of the day, lots of information will still need to be
around for those who need to put probes approximately anywhere and to
pull approximately any data out.



It may seem counterintuitive to you, but remember that object code is
recreated from scratch new every build, yet source code only gradually
(?)  changes.  Try checking in 3 years' builds of stripped object
files into a git repo.


- FChE
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Messages in current thread:
[patch for 2.6.26 0/7] Architecture Independent Markers, Mathieu Desnoyers, (Thu Mar 27, 9:20 am)
Re: [patch for 2.6.26 1/7] Markers - define non optimized ma..., Mathieu Desnoyers, (Thu Mar 27, 9:04 pm)
[PATCH] Markers - remove extra format argument, Mathieu Desnoyers, (Thu Mar 27, 9:02 pm)
Re: [PATCH] Markers - remove extra format argument, Masami Hiramatsu, (Fri Mar 28, 1:35 am)
Re: [patch for 2.6.26 0/7] Architecture Independent Markers, Frank Ch. Eigler, (Thu Mar 27, 5:49 pm)
Re: [patch for 2.6.26 0/7] Architecture Independent Markers, Mathieu Desnoyers, (Thu Mar 27, 4:39 pm)
Re: [patch for 2.6.26 0/7] Architecture Independent Markers, Mathieu Desnoyers, (Sat Mar 29, 1:16 pm)
Re: [patch for 2.6.26 0/7] Architecture Independent Markers, Mathieu Desnoyers, (Fri Mar 28, 7:38 am)
Re: [patch for 2.6.26 0/7] Architecture Independent Markers, KOSAKI Motohiro, (Thu Mar 27, 1:08 pm)
Re: [patch for 2.6.26 0/7] Architecture Independent Markers, Frank Ch. Eigler, (Fri Mar 28, 9:40 am)
Re: [patch for 2.6.26 0/7] Architecture Independent Markers, Frank Ch. Eigler, (Fri Mar 28, 11:31 am)
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