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unikernels and unified projects

Posted Mar 23, 2010 22:22 UTC (Tue) by ejr (subscriber, #51652)
In reply to: unikernels and unified projects by mingo
Parent article: KVM, QEMU, and kernel project management

Oh, and more specifically: Dynamically instrumenting user-space code with performance counters. That's existed since '94 or so and has been deployed on multiple OSes and large-scale systems with higher level tools and other gizmos.

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Posted Mar 23, 2010 23:02 UTC (Tue) by mingo (subscriber, #31122) [Link]

Most of those tools are PAPI based, and PAPI has been ported to the perf syscall as well - so there should be no problem whatsoever.

So, tools/perf/ is in no way an exclusive user of performance events - if that is your worry/argument. It uses the perf events system call, and that system call has a strict ABI and other tools can make use of it (and are making use of it today).

Thanks, Ingo