Messages in this thread | | | Date | Sat, 16 Sep 2006 10:21:54 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108 |
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* Roman Zippel <zippel@linux-m68k.org> wrote:
> > > > > This is simply not true, at the source level you can remove a > > > > > static tracepoint as easily as a dynamic tracepoint, the > > > > > effect of the missing trace information is the same either way. > > > > > > > > this is not true. I gave you one example already a few mails ago > > > > [...] > > > > > > Function attributes also doesn't provide information local to the > > > function. > > > > of course, but where does the above tracepoint i quoted use > > information local to the function? A fair number of markups use > > global functions because, surprise, alot of interesting activity > > happens along global functions. So a healthy reduction in markups > > can be achieved. > > But not completely, which is the whole point.
the point was what you said above, which i claimed and still claim to be false: "at the source level you can remove a static tracepoint as easily as a dynamic tracepoint, the effect of the missing trace information is the same either way."
Your point is still incorrect. I gave you an example of how half of the tracepoints could be removed under a dynamic scheme - while they couldnt be removed under a static scheme. Hence that directly contradicts your contention that "you can remove a static tracepoint as easily as a dynamic tracepoint". Nothing more, nothing less. I just pointed out the point in your thinking that i believe to be incorrect.
Reality is that you can remove a dynamic tracepoint much easier, due to the fundamental flexibility of dynamic tracers. While with static tracers, every tracepoint has to be _somewhere_ in the source code, otherwise people like you will complain just like you did in this mail: "you make life more difficult for static tracers for no reason".
You can concede my point or you can dispute that argument - but what you did above was neither: you snipped all the quotations and you claimed a totally new point. (which new point i never argued with: _of course_ i never claimed that __trace function attributes can remove _all_ markups. They can "only" remove half of them.)
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