> Subject: Re: [PATCH v1 00/11] PEBS virtualization enabling via DS > > > Testing: > > The guest can use PEBS feature like native. e.g. > > Could you please add example qemu command lines too? That will make it > much easier for someone to reproduce. I introduce a new CPU parameter "pebs" to enable PEBS in KVM guest(disabled in default) e.g. "qemu-system-x86_64 -enable-kvm -M q35 -cpu Icelake-Server,pmu=true,pebs=true ...." [PATCH v1 0/3] PEBS virtualization enabling via DS in Qemu https://lore.kernel.org/qemu-devel/1583490005-27761-1-git-send-email-luwei.kang@xxxxxxxxx/ Thanks, Luwei Kang > > -Andi > > > > # perf record -e instructions:ppp ./br_instr a > > > > perf report on guest: > > # Samples: 2K of event 'instructions:ppp', # Event count (approx.): > 1473377250 > > # Overhead Command Shared Object Symbol > > 57.74% br_instr br_instr [.] lfsr_cond > > 41.40% br_instr br_instr [.] cmp_end > > 0.21% br_instr [kernel.kallsyms] [k] __lock_acquire > > > > perf report on host: > > # Samples: 2K of event 'instructions:ppp', # Event count (approx.): > 1462721386 > > # Overhead Command Shared Object Symbol > > 57.90% br_instr br_instr [.] lfsr_cond > > 41.95% br_instr br_instr [.] cmp_end > > 0.05% br_instr [kernel.vmlinux] [k] lock_acquire
