mirror of https://gitee.com/openkylin/linux.git
30b5c851af
This is how Xen guests do steal time accounting. The hypervisor records the amount of time spent in each of running/runnable/blocked/offline states. In the Xen accounting, a vCPU is still in state RUNSTATE_running while in Xen for a hypercall or I/O trap, etc. Only if Xen explicitly schedules does the state become RUNSTATE_blocked. In KVM this means that even when the vCPU exits the kvm_run loop, the state remains RUNSTATE_running. The VMM can explicitly set the vCPU to RUNSTATE_blocked by using the KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT attribute, and can also use KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST to retrospectively add a given amount of time to the blocked state and subtract it from the running state. The state_entry_time corresponds to get_kvmclock_ns() at the time the vCPU entered the current state, and the total times of all four states should always add up to state_entry_time. Co-developed-by: Joao Martins <joao.m.martins@oracle.com> Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Message-Id: <20210301125309.874953-2-dwmw2@infradead.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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| .. | ||
| aarch64 | ||
| include | ||
| lib | ||
| s390x | ||
| x86_64 | ||
| .gitignore | ||
| Makefile | ||
| config | ||
| demand_paging_test.c | ||
| dirty_log_perf_test.c | ||
| dirty_log_test.c | ||
| hardware_disable_test.c | ||
| kvm_create_max_vcpus.c | ||
| memslot_modification_stress_test.c | ||
| set_memory_region_test.c | ||
| settings | ||
| steal_time.c | ||