Public bug reported:
With the addition of more CPU state information of data, the PEBS(Processor
Event Based Sampling) record size is greatly increased. However, most general
users of PEBS require just the eventingIP and do not require such a large PEBS
record.
Adaptive PEBS provides Software the capability to configure the PEBS records
to capture only the data of interest, keeping the record size compact.
Need modify KVM and Qemu.
Adaptive PEBS (Processor Event Based Sampling) is configurable PEBS records for
only interested data collection from massive PEBS data. It depends on PEBS via
PT. The enabling work includes:
◾Expose this feature and MSR configure bit in guest PEBS driver
◾Save and restore status in vCPU when vm_exit and vm_entry
◾Support both host-guest mode and system mode.
** Affects: xen (Ubuntu)
Importance: Undecided
Status: New
** Tags: intel
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https://bugs.launchpad.net/bugs/1782208
Title:
KVM SnowRidge Adaptive PEBS
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