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powerpc/perf: Add per-task/process monitoring to vpa_pmu driver

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Enhance the vpa_pmu driver with a feature to observe context switch
latency event for both per-task (tid) and per-pid (pid) option.
Couple of new helper functions are added to hide the abstraction of
reading the context switch latency counter from kvm_vcpu_arch struct
and these helper functions are defined in the "kvm/book3s_hv.c".

"PERF_ATTACH_TASK" flag is used to decide whether to read the counter
values from lppaca or kvm_vcpu_arch struct.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Co-developed-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241118114114.208964-4-kjain@linux.ibm.com
This commit is contained in:
Kajol Jain 2024-11-18 17:11:14 +05:30 committed by Michael Ellerman
parent 5f0b48c6a1
commit f26f9933e3
3 changed files with 60 additions and 3 deletions
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3
arch/powerpc/include/asm/kvm_book3s_64.h
View File

@ -691,6 +691,9 @@ void kvmhv_set_l2_counters_status(int cpu, bool status);
u64 kvmhv_get_l1_to_l2_cs_time(void);
u64 kvmhv_get_l2_to_l1_cs_time(void);
u64 kvmhv_get_l2_runtime_agg(void);
u64 kvmhv_get_l1_to_l2_cs_time_vcpu(void);
u64 kvmhv_get_l2_to_l1_cs_time_vcpu(void);
u64 kvmhv_get_l2_runtime_agg_vcpu(void);
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */

45
arch/powerpc/kvm/book3s_hv.c
View File

@ -4190,6 +4190,51 @@ u64 kvmhv_get_l2_runtime_agg(void)
}
EXPORT_SYMBOL(kvmhv_get_l2_runtime_agg);
u64 kvmhv_get_l1_to_l2_cs_time_vcpu(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vcpu_arch *arch;
vcpu = local_paca->kvm_hstate.kvm_vcpu;
if (vcpu) {
arch = &vcpu->arch;
return arch->l1_to_l2_cs;
} else {
return 0;
}
}
EXPORT_SYMBOL(kvmhv_get_l1_to_l2_cs_time_vcpu);
u64 kvmhv_get_l2_to_l1_cs_time_vcpu(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vcpu_arch *arch;
vcpu = local_paca->kvm_hstate.kvm_vcpu;
if (vcpu) {
arch = &vcpu->arch;
return arch->l2_to_l1_cs;
} else {
return 0;
}
}
EXPORT_SYMBOL(kvmhv_get_l2_to_l1_cs_time_vcpu);
u64 kvmhv_get_l2_runtime_agg_vcpu(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vcpu_arch *arch;
vcpu = local_paca->kvm_hstate.kvm_vcpu;
if (vcpu) {
arch = &vcpu->arch;
return arch->l2_runtime_agg;
} else {
return 0;
}
}
EXPORT_SYMBOL(kvmhv_get_l2_runtime_agg_vcpu);
#else
int kvmhv_get_l2_counters_status(void)
{

15
arch/powerpc/perf/vpa-pmu.c
View File

@ -97,13 +97,22 @@ static unsigned long get_counter_data(struct perf_event *event)
switch (config) {
case L1_TO_L2_CS_LAT:
data = kvmhv_get_l1_to_l2_cs_time();
if (event->attach_state & PERF_ATTACH_TASK)
data = kvmhv_get_l1_to_l2_cs_time_vcpu();
else
data = kvmhv_get_l1_to_l2_cs_time();
break;
case L2_TO_L1_CS_LAT:
data = kvmhv_get_l2_to_l1_cs_time();
if (event->attach_state & PERF_ATTACH_TASK)
data = kvmhv_get_l2_to_l1_cs_time_vcpu();
else
data = kvmhv_get_l2_to_l1_cs_time();
break;
case L2_RUNTIME_AGG:
data = kvmhv_get_l2_runtime_agg();
if (event->attach_state & PERF_ATTACH_TASK)
data = kvmhv_get_l2_runtime_agg_vcpu();
else
data = kvmhv_get_l2_runtime_agg();
break;
default:
data = 0;