unikernels and unified projects [LWN.net]

unikernels and unified projects

Posted Mar 26, 2010 9:43 UTC (Fri) by mingo (subscriber, #31122)
In reply to: unikernels and unified projects by deater
Parent article: KVM, QEMU, and kernel project management

  I'm still waiting for perf to have half the features of the
  pfmon tool that came with perfmon2.

I know pfmon and as far as i'm aware perf currently has a lot more features than pfmon ever had.

That's obviously in stark contrast with your statement - so could you please cite the features that perf doesnt have? Either we missed them (and thus will implement them) or they are implemented but you are not aware of them.

Thanks, Ingo.

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unikernels and unified projects

Posted Mar 26, 2010 21:41 UTC (Fri) by deater (subscriber, #11746) [Link]

ability to specify _all_ events by name, i.e. if I want "SNOOPQ_REQUESTS_OUTSTANDING.DATA" I can just say so, instead of having to look it up and then having to specify the unintuitive "r01b3".

Being able to specify an output file that is nice ascii text, dumped every time a counter hits a certain threshold. This is probably possible with perf, but the perf --help is hard to follow.

It would be nice to have a perf-only mailing list, but I guess that will never happen.

It would also be nice to be able to build perf without having to download the entire kernel tree, I often don't have the space or the bandwidth for hundreds of megabytes of kernel source when I just want to quick build perf on a new machine.