diff options
| author | Kajol Jain <[email protected]> | 2024-11-18 17:11:13 +0530 |
|---|---|---|
| committer | Michael Ellerman <[email protected]> | 2024-11-19 14:11:21 +1100 |
| commit | 5f0b48c6a168994cc09d02888c2d939eba2af193 (patch) | |
| tree | 6ec21e1f7a59b6eaadf463c6c5ecf03c715ad388 | |
| parent | 4ae0b32ecee730a41f65eb122bbb40fda7dca34a (diff) | |
powerpc/kvm: Add vpa latency counters to kvm_vcpu_arch
Commit e1f288d2f9c69 ("KVM: PPC: Book3S HV nestedv2: Add support
for reading VPA counters for pseries guests") introduced support for new
Virtual Process Area(VPA) based software counters. These counters are
useful when observing context switch latency of L1 <-> L2. It also
added access to counters in lppaca, which is good enough to understand
latency details per-cpu level. But to extend and aggregate
per-process level(qemu) or per-pid/tid level(vcpu), these
counters also needs to be added as part of kvm_vcpu_arch struct.
Additional code added to update these new kvm_vcpu_arch variables
in do_trace_nested_cs_time function.
Signed-off-by: Kajol Jain <[email protected]>
Co-developed-by: Madhavan Srinivasan <[email protected]>
Signed-off-by: Madhavan Srinivasan <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://patch.msgid.link/[email protected]
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 5 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 3 |
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 37e581c5b201..6e1108f8fce6 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -871,6 +871,11 @@ struct kvm_vcpu_arch { struct kvmhv_tb_accumulator cede_time; /* time napping inside guest */ #endif #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + u64 l1_to_l2_cs; + u64 l2_to_l1_cs; + u64 l2_runtime_agg; +#endif }; #define VCPU_FPR(vcpu, i) (vcpu)->arch.fp.fpr[i][TS_FPROFFSET] diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 4843063df88c..613231c436e7 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4167,6 +4167,9 @@ static void do_trace_nested_cs_time(struct kvm_vcpu *vcpu) *l1_to_l2_cs_ptr = l1_to_l2_ns; *l2_to_l1_cs_ptr = l2_to_l1_ns; *l2_runtime_agg_ptr = l2_runtime_ns; + vcpu->arch.l1_to_l2_cs = l1_to_l2_ns; + vcpu->arch.l2_to_l1_cs = l2_to_l1_ns; + vcpu->arch.l2_runtime_agg = l2_runtime_ns; } u64 kvmhv_get_l1_to_l2_cs_time(void) |