Public bug reported:
The PEBS(Processor Event Based Sampling) facility allows software to profile
workload behavior by periodically capturing machine state, memory access
information and other groups of architectural information. In native systems,
PEBS uses a debug store mechanism to store a set of architectural state
information for the processor and we need to specify a linear pages for the
output buffer which must be pinned to physical pages. In virtualized systems,
pinning the platform physical pages for the output buffer is difficult.
PT V4 provide a method to format PEBS sampling data to new type of trace
packet and output to Intel Processor Trace buffer. This depend on
PT-VMX(Enabling use of EPT to redirect PT output)which enabled in ICX platform.
Need modify in KVM and Qemu.
Intel Processor Trace v4 task list:
◾PT VMX which is done and in upstream phase, and need more review and update
effort
◾PEBS via PT on SNR. It's new added task, which target to ww48
◾PT PEBS/EMON integration. This feature allows PEBS data to be written into PT
output channel, leveraging PT Virtualization work for PEBS.
◾cpuid support and context switch
◾Support host-guest mode and system mode
More Open feature includes Live Migration support and LBR support
Upstream target Linux 4.20
** Affects: xen (Ubuntu)
Importance: Undecided
Status: New
** Tags: intel
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https://bugs.launchpad.net/bugs/1782207
Title:
KVM SnowRidge Processor Trace v4
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