Messages in this thread | | | Subject | Re: [PATCH] Enhance perf to collect KVM guest os statistics from host side | From | Soeren Sandmann <> | Date | 23 Mar 2010 15:04:57 +0100 |
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Andi Kleen <andi@firstfloor.org> writes:
> Soeren Sandmann <sandmann@daimi.au.dk> writes: > > > > To fix that problem, it seems like we need some way to have python > > export what is going on. Maybe the same mechanism could be used to > > both access what is going on in qemu and python. > > oprofile already has an interface to let JITs export > information about the JITed code. C Python is not a JIT, > but presumably one of the python JITs could do it. > > http://oprofile.sourceforge.net/doc/devel/index.html
It's not that I personally want to profile a particular python program. I'm interested in the more general problem of extracting more information from profiled user space programs than just stack traces.
Examples:
- What is going on inside QEMU?
- Which client is the X server servicing?
- What parts of a python/shell/scheme/javascript program is taking the most CPU time?
I don't think the oprofile JIT interface solves any of these problems. (In fact, I don't see why the JIT problem is even hard. The JIT compiler can just generate a little ELF file with symbols in it, and the profiler can pick it up through the mmap events that you get through the perf interface).
> I know it's not envogue anymore and you won't be a approved > cool kid if you do, but you could just use oprofile?
I am bringing this up because I want to extend sysprof to be more useful.
Soren
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