On 23.08.2018 17:57, Thor Lancelot Simon wrote: > On Thu, Aug 23, 2018 at 05:09:35PM +0200, Kamil Rytarowski wrote: >> >> Observing that all the useful profiling is already done with DTrace, we >> can remove complexity from the kernel with negligible cost. > > I'm not sure what to make of this. I'm trying to come up with a way to > make the above statement true, and I'm having some difficulty. > > You can't possibly mean "Observing that (unproven premise), therefore > (conclusion)", so I'll discard that interpretation. > > Do you perhaps mean "*If* we were to observe that all useful profiling > were done with DTrace, *then* we could remove complexity from the > kernel with negligible cost"? > > Because Ragge and others have been pointing out that in that case, > the premise "all useful profiling is done with DTrace" does not appear > to be true. Profiling kernel code on VAX may not be useful *to you* > but that does not imply it is "not useful" simpliciter. > As useful I mean the number of commits to the src/ tree. If nothing landed, probably nothing was useful. When were the most recent patches from gprof or similar?
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