Messages in this thread | | | Date | Sun, 17 Sep 2006 17:09:53 +0200 | From | Ingo Molnar <> | Subject | Re: tracepoint maintainance models |
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* Roman Zippel <zippel@linux-m68k.org> wrote:
> Hi, > > On Sun, 17 Sep 2006, Ingo Molnar wrote: > > > > This thread would be much better off talking about how to go about > > > implementing lightweight markers rather than spent on mindless rants. > > > > i agree, as long as it's lightweight markers for _dynamic tracers_, so > > that we keep our options open - as per the arguments above. > > Could you please explain, why we can't have markers which are usable > by any tracer?
the main reason for that i explained in the portion of the email you snipped:
> > On the other hand, if we accept static tracers into the mainline > > kernel, we have to decide in favor of tracepoint-maintainance model > > #1 _FOREVER_. It will be a point of no return for a likely long > > time. Moving a static tracepoint or even breaking it will cause > > end-user pain that needs an _upstream kernel fix_. It needs a new > > stable kernel, etc., etc. It is very inflexible, and fundamentally > > so.
of course it's easy to have static markup that is usable for both types of tracers - but that is of little use. Static tracers also need the guarantee of a _full set_ of static markups. It is that _guarantee_ of a full set that i'm arguing against primarily. Without that guarantee it's useless to have markups that can be used by static tracers as well: you wont get a full set of tracepoints and the end-user will complain. (partial static markups are of course still very useful to dynamic tracers)
( furthermore, there are other reasons as well: i explained my position in some of those replies that you did not want to "further dvelve into". I'm happy to give you Message-IDs if you'd like to follow up on them, there's no need to repeat them here. )
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