Re: [PATCH 0/18] Allow different tracers to be compiled independently

On Mar 22, 2010, at 9:04 PM, Frederic Weisbecker wrote:
> 
> I don't know. Yeah this first looks like a good idea but once
> CONFIG_EVENT_TRACING is enabled, each tracepoint is a lightweight
> thing and induce a tiny overhead, probably hard to notice, and
> this is going to be even more the case after the jmp label
> optimization patches.
> 
> I liked the fact we had a general tracing kernel once the above
> config is selected. And we don't bother telling people that to
> use tool X you need CONFIG_EVENT_Y, and you need to rebuild your
> kernel, etc...

Indeed, a lot of the value of tracepoints goes away if people are compiling kernels without them
and we need to get a special "tracing kernel" installed before we can debug a problem.

So I'd hope we can do the necessary optimization work so people don't feel it's necessary to enable
or disable tracepoints by subsystem....

-- Ted