Messages in this thread | | | Date | Wed, 16 Feb 2022 13:08:49 +0800 | Subject | Re: [PATCH kvm/queue v2 2/3] perf: x86/core: Add interface to query perfmon_event_map[] directly | From | Like Xu <> |
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On 10/2/2022 11:34 pm, Liang, Kan wrote: > For the current perf subsystem, a PMU should be shared among different users via > the multiplexing mechanism if the resource is limited. No one has full control > of a PMU for lifetime. A user can only have the PMU in its given period.
Off-topic, does perf has knobs to disable the default multiplexing mechanism for individual tasks and enforce a first-come, first-served policy for same priority ?
The reported perf data from the multiplexing mechanism may even mislead the conclusions of subsequent statistically based performance analysis.
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