lkml.org 
[lkml]   [2006]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
From
Date
>>>>> "Ingo" == Ingo Molnar <mingo@elte.hu> writes:

Ingo> * Martin Bligh <mbligh@mbligh.org> wrote:

>> I don't think anyone is saying that static tracepoints do not have
>> their limitations, or that dynamic tracepointing is useless. But
>> that's not the point ... why can't we have one infrastructure that
>> supports both? Preferably in a fairly simple, consistent way.

Ingo> primarily because i fail to see any property of static tracers
Ingo> that are not met by dynamic tracers. So to me dynamic tracers
Ingo> like SystemTap are a superset of static tracers.

Ingo> So my position is that what we should concentrate on is to make
Ingo> the life of dynamic tracers easier (be that a handful of
Ingo> generic, parametric hooks that gather debuginfo information and
Ingo> add NOPs for easy patching), while realizing that static tracers
Ingo> have no advantage over dynamic tracers.

The parallel that springs to mind here is C++ kernel components 'I
promise to only use the good parts', then next week someone else adds
another pile in a worse place. Once the points are in we will never
get rid of them, look at how long it took to get rid of devfs :( In
addition it is guaranteed that people will not be able to agree on
which points to put where, despite the claim that there will be only
30 points - sorry, I am not buying that, we have plenty of evidence to
show the opposite.

I looked at the old LTT code a while ago and it was pretty appalling,
maybe LTTng is better, but I can't say the old code gave me a warm
fuzzy feeling.

Jes
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-09-15 11:31    [W:0.456 / U:0.544 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site