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Re: 2 problems with sprof
"H . J . Lu" <hjl@lucon.org> writes:
> > It's only not the same with regard to the data structures created and
> > the dynamic nature of loading and unloading. The rest is the same.
>
> Did you mean profiling executable plus a DSO doesn't work or just
> profiling executable doesn't work? I agree profiling executable plus
> a DSO is almost the same as profiling 2 DSOs. But I don't think it
> is worth fixing profiling executable alone if we still can't profile
> DSO at the same time. As I said, when I make the change, I will take
> profiling executable into account.
This means writing a completely new profiler and it also means ld.so
is not involved. BTW: ld.so's method is everything but good for real
profiling since you cannot look inside it.
Don't waste time in looking for multiple-DSO support in ld.so, this
won't help you solve the real problem.
> Do we need a way to tell ld.so to profile executable? If yes, how?
You cannot.
> Also does sprof support executable?
No. The whole concept is completely alien to executables.
> Are there any patches for kernel POSIX timer?
Yes, I think so. Linus comments that he doesn't like it, though.
Don't know what the current status is, though.
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