Perf Support in Xen
summary
Enables Linux perf so PV guests and dom0 can profile themselves and dom0 can profile the hypervisor by reusing vPMU reuse to virtualize PMU register state, delivering interrupts that pass IP and registers to dom0 and using a new hypercall to reload counters; implements a global profiling mode that profiles guests and hypervisor but stage one has no sampling support and must pin vCPUs for accurate results. Works in demos but patches are not in mainline 4.4 and backtrace support for hypervisor is incomplete.
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chapters (8)
- 0:00Intro
- 1:36Methods for measuring performance
- 5:02Existing tools
- 11:07Highlevel design
- 15:51Limitations
- 18:42Enhancements
- 21:31Global mode
- 23:43Demo
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