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Message-ID: <CAAhSdy0tEpgmC1VgMn_Km5SxwanOii5LzL-5oTJWbN+1vLjWug@mail.gmail.com> Date: Sat, 5 Oct 2024 16:36:00 +0530 From: Anup Patel <anup@...infault.org> To: zhouquan@...as.ac.cn Cc: ajones@...tanamicro.com, atishp@...shpatra.org, paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu, mark.rutland@....com, alexander.shishkin@...ux.intel.com, jolsa@...nel.org, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, linux-perf-users@...r.kernel.org Subject: Re: [PATCH v3 0/2] riscv: Add perf support to collect KVM guest statistics from host side On Thu, Sep 12, 2024 at 1:30 PM <zhouquan@...as.ac.cn> wrote: > > From: Quan Zhou <zhouquan@...as.ac.cn> > > Add basic guest support to RISC-V perf, enabling it to distinguish > whether PMU interrupts occur in the host or the guest, and then > collect some basic guest information from the host side > (guest os callchain is not supported for now). > > Based on the x86/arm implementation, tested with kvm-riscv. > test env: > - host: qemu-9.0.0 > - guest: qemu-9.0.0 --enable-kvm (only start one guest and run top) > > ----------------------------------------- > 1) perf kvm top > ./perf kvm --host --guest \ > --guestkallsyms=/root/repo/shared/kallsyms \ > --guestmodules=/root/repo/shared/modules top > > PerfTop: 41 irqs/sec kernel:97.6% us: 0.0% guest kernel: 0.0% guest us: 0.0% exact: 0.0% [250Hz cycles:P], (all, 4 CPUs) > ------------------------------------------------------------------------------- > > 64.57% [kernel] [k] default_idle_call > 3.12% [kernel] [k] _raw_spin_unlock_irqrestore > 3.03% [guest.kernel] [g] mem_serial_out > 2.61% [kernel] [k] handle_softirqs > 2.32% [kernel] [k] do_trap_ecall_u > 1.71% [kernel] [k] _raw_spin_unlock_irq > 1.26% [guest.kernel] [g] do_raw_spin_lock > 1.25% [kernel] [k] finish_task_switch.isra.0 > 1.16% [kernel] [k] do_idle > 0.77% libc.so.6 [.] ioctl > 0.76% [kernel] [k] queue_work_on > 0.69% [kernel] [k] __local_bh_enable_ip > 0.67% [guest.kernel] [g] __noinstr_text_start > 0.64% [guest.kernel] [g] mem_serial_in > 0.41% libc.so.6 [.] pthread_sigmask > 0.39% [kernel] [k] mem_cgroup_uncharge_skmem > 0.39% [kernel] [k] __might_resched > 0.39% [guest.kernel] [g] _nohz_idle_balance.isra.0 > 0.37% [kernel] [k] sched_balance_update_blocked_averages > 0.34% [kernel] [k] sched_balance_rq > > 2) perf kvm record > ./perf kvm --host --guest \ > --guestkallsyms=/root/repo/shared/kallsyms \ > --guestmodules=/root/repo/shared/modules record -a sleep 60 > > [ perf record: Woken up 3 times to write data ] > [ perf record: Captured and wrote 1.292 MB perf.data.kvm (17990 samples) ] > > 3) perf kvm report (the data shown here is not complete) > ./perf kvm --host --guest \ > --guestkallsyms=/root/repo/shared/kallsyms \ > --guestmodules=/root/repo/shared/modules report -i perf.data.kvm > > # Total Lost Samples: 0 > # > # Samples: 17K of event 'cycles:P' > # Event count (approx.): 269968947184 > # > # Overhead Command Shared Object Symbol > # ........ ............... ....................... .............................................. > # > 61.86% swapper [kernel.kallsyms] [k] default_idle_call > 2.93% :6463 [guest.kernel.kallsyms] [g] do_raw_spin_lock > 2.82% :6462 [guest.kernel.kallsyms] [g] mem_serial_out > 2.11% sshd [kernel.kallsyms] [k] _raw_spin_unlock_irqrestore > 1.78% :6462 [guest.kernel.kallsyms] [g] do_raw_spin_lock > 1.37% swapper [kernel.kallsyms] [k] handle_softirqs > 1.36% swapper [kernel.kallsyms] [k] do_idle > 1.21% sshd [kernel.kallsyms] [k] do_trap_ecall_u > 1.21% sshd [kernel.kallsyms] [k] _raw_spin_unlock_irq > 1.11% qemu-system-ris [kernel.kallsyms] [k] do_trap_ecall_u > 0.93% qemu-system-ris libc.so.6 [.] ioctl > 0.89% sshd [kernel.kallsyms] [k] __local_bh_enable_ip > 0.77% qemu-system-ris [kernel.kallsyms] [k] _raw_spin_unlock_irqrestore > 0.68% qemu-system-ris [kernel.kallsyms] [k] queue_work_on > 0.65% sshd [kernel.kallsyms] [k] handle_softirqs > 0.44% :6462 [guest.kernel.kallsyms] [g] mem_serial_in > 0.42% sshd libc.so.6 [.] pthread_sigmask > 0.34% :6462 [guest.kernel.kallsyms] [g] serial8250_tx_chars > 0.30% swapper [kernel.kallsyms] [k] finish_task_switch.isra.0 > 0.29% swapper [kernel.kallsyms] [k] sched_balance_rq > 0.29% sshd [kernel.kallsyms] [k] __might_resched > 0.26% swapper [kernel.kallsyms] [k] tick_nohz_idle_exit > 0.26% swapper [kernel.kallsyms] [k] sched_balance_update_blocked_averages > 0.26% swapper [kernel.kallsyms] [k] _nohz_idle_balance.isra.0 > 0.24% qemu-system-ris [kernel.kallsyms] [k] finish_task_switch.isra.0 > 0.23% :6462 [guest.kernel.kallsyms] [g] __noinstr_text_start > > --- > Change since v2: > - Rebased on v6.11-rc7 > - Keep the misc type consistent with other architectures > as `unsigned long` (Andrew) > - Add the same comment for `kvm_arch_pmi_in_guest` > as in arm64. (Andrew) > > Change since v1: > - Rebased on v6.11-rc3 > - Fix incorrect misc type (Andrew) > > --- > v1 link: > https://lore.kernel.org/all/cover.1721271251.git.zhouquan@iscas.ac.cn/ > v2 link: > https://lore.kernel.org/all/cover.1723518282.git.zhouquan@iscas.ac.cn/ > > Quan Zhou (2): > riscv: perf: add guest vs host distinction > riscv: KVM: add basic support for host vs guest profiling Please rebase this series upon Linux-6.12-rcX and send another version. Regards, Anup > > arch/riscv/include/asm/kvm_host.h | 10 ++++++++ > arch/riscv/include/asm/perf_event.h | 7 ++++++ > arch/riscv/kernel/perf_callchain.c | 38 +++++++++++++++++++++++++++++ > arch/riscv/kvm/Kconfig | 1 + > arch/riscv/kvm/main.c | 12 +++++++-- > arch/riscv/kvm/vcpu.c | 7 ++++++ > 6 files changed, 73 insertions(+), 2 deletions(-) > > > base-commit: da3ea35007d0af457a0afc87e84fddaebc4e0b63 > -- > 2.34.1 >
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