| Message ID | 20240415031131.23443-1-liangshenlin@eswincomputing.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | perf kvm: Add kvm stat support on riscv | expand |
On 4/14/24 20:11, Shenlin Liang wrote: > Changes from v1->v2: > - Rebased on Linux 6.9-rc3. > > 'perf kvm stat report/record' generates a statistical analysis of KVM > events and can be used to analyze guest exit reasons. This patch tries > to add stat support on riscv. > > Map the return value of trace_kvm_exit() to the specific cause of the > exception, and export it to userspace. > > It records on two available KVM tracepoints for riscv: "kvm:kvm_entry" > and "kvm:kvm_exit", and reports statistical data which includes events > handles time, samples, and so on. > > Simple tests go below: > > # ./perf kvm record -e "kvm:kvm_entry" -e "kvm:kvm_exit" > Lowering default frequency rate from 4000 to 2500. > Please consider tweaking /proc/sys/kernel/perf_event_max_sample_rate. > [ perf record: Woken up 18 times to write data ] > [ perf record: Captured and wrote 5.433 MB perf.data.guest (62519 samples) > I want to test these patches but couldn't build a perf for RISC-V with libtraceevent enabled. It fails with pkg-config dependencies when I tried to build it (both via buildroot and directly from kernel source). > # ./perf kvm report > 31K kvm:kvm_entry > 31K kvm:kvm_exit > > # ./perf kvm stat record -a > [ perf record: Woken up 3 times to write data ] > [ perf record: Captured and wrote 8.502 MB perf.data.guest (99338 samples) ] > > # ./perf kvm stat report --event=vmexit > Event name Samples Sample% Time (ns) Time% Max Time (ns) Min Time (ns) Mean Time (ns) > STORE_GUEST_PAGE_FAULT 26968 54.00% 2003031800 40.00% 3361400 27600 74274 > LOAD_GUEST_PAGE_FAULT 17645 35.00% 1153338100 23.00% 2513400 30800 65363 > VIRTUAL_INST_FAULT 1247 2.00% 340820800 6.00% 1190800 43300 273312 > INST_GUEST_PAGE_FAULT 1128 2.00% 340645800 6.00% 2123200 30200 301990 > SUPERVISOR_SYSCALL 1019 2.00% 245989900 4.00% 1851500 29300 241403 > LOAD_ACCESS 986 1.00% 671556200 13.00% 4180200 100700 681091 > INST_ACCESS 655 1.00% 170054800 3.00% 1808300 54600 259625 > HYPERVISOR_SYSCALL 21 0.00% 4276400 0.00% 716500 116000 203638 > > Shenlin Liang (2): > RISCV: KVM: add tracepoints for entry and exit events > perf kvm/riscv: Port perf kvm stat to RISC-V > > arch/riscv/kvm/trace.h | 67 ++++++++++++++++ > arch/riscv/kvm/vcpu.c | 7 ++ > tools/perf/arch/riscv/Makefile | 1 + > tools/perf/arch/riscv/util/Build | 1 + > tools/perf/arch/riscv/util/kvm-stat.c | 78 +++++++++++++++++++ > .../arch/riscv/util/riscv_exception_types.h | 41 ++++++++++ > 6 files changed, 195 insertions(+) > create mode 100644 arch/riscv/kvm/trace.h > create mode 100644 tools/perf/arch/riscv/util/kvm-stat.c > create mode 100644 tools/perf/arch/riscv/util/riscv_exception_types.h >
Hi Atish, I assume that you are cross building it on X86. You need to build a pkg-config-riscv64 first. Or get a deb file from [1] if you are buiding on Ubuntu. Instead of cross building, it is recommended to build it natively. BTW, please test with V3 which I sent today. [1] https://answers.launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3719-deletedppa/+build/16823862/+files/pkg-config-riscv64-linux-gnu_7.4.0-1ubuntu1.3_amd64.deb Thanks. Shenlin > > On 4/14/24 20:11, Shenlin Liang wrote: > > Changes from v1->v2: > > - Rebased on Linux 6.9-rc3. > > > > 'perf kvm stat report/record' generates a statistical analysis of KVM > > events and can be used to analyze guest exit reasons. This patch tries > > to add stat support on riscv. > > > > Map the return value of trace_kvm_exit() to the specific cause of the > > exception, and export it to userspace. > > > > It records on two available KVM tracepoints for riscv: "kvm:kvm_entry" > > and "kvm:kvm_exit", and reports statistical data which includes events > > handles time, samples, and so on. > > > > Simple tests go below: > > > > # ./perf kvm record -e "kvm:kvm_entry" -e "kvm:kvm_exit" > > Lowering default frequency rate from 4000 to 2500. > > Please consider tweaking /proc/sys/kernel/perf_event_max_sample_rate. > > [ perf record: Woken up 18 times to write data ] > > [ perf record: Captured and wrote 5.433 MB perf.data.guest (62519 samples) > > > > I want to test these patches but couldn't build a perf for RISC-V with > libtraceevent enabled. It fails with pkg-config dependencies when I > tried to build it (both via buildroot and directly from kernel source). > > > # ./perf kvm report > > 31K kvm:kvm_entry > > 31K kvm:kvm_exit > > > > # ./perf kvm stat record -a > > [ perf record: Woken up 3 times to write data ] > > [ perf record: Captured and wrote 8.502 MB perf.data.guest (99338 samples) ] > > > > # ./perf kvm stat report --event=vmexit > > Event name Samples Sample% Time (ns) Time% Max Time (ns) Min Time (ns) Mean Time (ns) > > STORE_GUEST_PAGE_FAULT 26968 54.00% 2003031800 40.00% 3361400 27600 74274 > > LOAD_GUEST_PAGE_FAULT 17645 35.00% 1153338100 23.00% 2513400 30800 65363 > > VIRTUAL_INST_FAULT 1247 2.00% 340820800 6.00% 1190800 43300 273312 > > INST_GUEST_PAGE_FAULT 1128 2.00% 340645800 6.00% 2123200 30200 301990 > > SUPERVISOR_SYSCALL 1019 2.00% 245989900 4.00% 1851500 29300 241403 > > LOAD_ACCESS 986 1.00% 671556200 13.00% 4180200 100700 681091 > > INST_ACCESS 655 1.00% 170054800 3.00% 1808300 54600 259625 > > HYPERVISOR_SYSCALL 21 0.00% 4276400 0.00% 716500 116000 203638 > > > > Shenlin Liang (2): > > RISCV: KVM: add tracepoints for entry and exit events > > perf kvm/riscv: Port perf kvm stat to RISC-V > > > > arch/riscv/kvm/trace.h | 67 ++++++++++++++++ > > arch/riscv/kvm/vcpu.c | 7 ++ > > tools/perf/arch/riscv/Makefile | 1 + > > tools/perf/arch/riscv/util/Build | 1 + > > tools/perf/arch/riscv/util/kvm-stat.c | 78 +++++++++++++++++++ > > .../arch/riscv/util/riscv_exception_types.h | 41 ++++++++++ > > 6 files changed, 195 insertions(+) > > create mode 100644 arch/riscv/kvm/trace.h > > create mode 100644 tools/perf/arch/riscv/util/kvm-stat.c > > create mode 100644 tools/perf/arch/riscv/util/riscv_exception_types.h > >