On Mon, Nov 09, 2020 at 10:12:37AM +0800, Like Xu wrote: > The Precise Event Based Sampling(PEBS) supported on Intel Ice Lake server > platforms can provide an architectural state of the instruction executed > after the instruction that caused the event. This patch set enables the > the PEBS via DS feature for KVM (also non) Linux guest on the Ice Lake. > The Linux guest can use PEBS feature like native: > > # perf record -e instructions:ppp ./br_instr a > # perf record -c 100000 -e instructions:pp ./br_instr a > > If the counter_freezing is not enabled on the host, the guest PEBS will > be disabled on purpose when host is using PEBS facility. By default, > KVM disables the co-existence of guest PEBS and host PEBS. Uuhh, what?!? counter_freezing should never be enabled, its broken. Let me go delete all that code.
