Series applied, thanks. Huacai On Mon, Feb 24, 2025 at 5:56 PM Bibo Mao <maobibo@xxxxxxxxxxx> wrote: > > From perf pmu interrupt is normal IRQ rather than NMI, so code cannot be > profiled if interrupt is disabled. However it is possible to profile > guest kernel in this situation from host side, profile result is more > accurate from host than that from guest. > > Perf event support for guest VM is added here, and the below is the > example: > perf kvm --host --guest --guestkallsyms=guest-kallsyms > --guestmodules=guest-modules top > > Overhead Shared Object Symbol > 20.02% [guest.kernel] [g] __arch_cpu_idle > 16.74% [guest.kernel] [g] queued_spin_lock_slowpath > 10.05% [kernel] [k] __arch_cpu_idle > 2.00% [guest.kernel] [g] clear_page > 1.62% [guest.kernel] [g] copy_page > 1.50% [guest.kernel] [g] next_uptodate_folio > 1.41% [guest.kernel] [g] queued_write_lock_slowpath > 1.41% [guest.kernel] [g] unmap_page_range > 1.36% [guest.kernel] [g] mod_objcg_state > 1.30% [guest.kernel] [g] osq_lock > 1.28% [guest.kernel] [g] __slab_free > 0.98% [guest.kernel] [g] copy_page_range > > Bibo Mao (3): > LoongArch: KVM: Add stub for kvm_arch_vcpu_preempted_in_kernel > LoongArch: KVM: Implement arch specified functions for guest perf > LoongArch: KVM: Register perf callback for guest > > arch/loongarch/include/asm/kvm_host.h | 2 ++ > arch/loongarch/kvm/Kconfig | 1 + > arch/loongarch/kvm/main.c | 2 ++ > arch/loongarch/kvm/vcpu.c | 31 +++++++++++++++++++++++++++ > 4 files changed, 36 insertions(+) > > > base-commit: 2408a807bfc3f738850ef5ad5e3fd59d66168996 > -- > 2.39.3 > >
