[PATCH 13/13] KVM: PPC: Book3S HV: Counters for passthrough IRQ stats
From: Paul Mackerras <hidden>
Date: 2016-08-19 05:36:10
Also in:
kvm
Subsystem:
kernel virtual machine for powerpc (kvm/powerpc), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
From: Suresh Warrier <redacted>
Add VCPU stat counters to track affinity for passthrough
interrupts.
pthru_all: Counts all passthrough interrupts whose IRQ mappings are
in the kvmppc_passthru_irq_map structure.
pthru_host: Counts all cached passthrough interrupts that were injected
from the host through kvm_set_irq (i.e. not handled in
real mode).
pthru_bad_aff: Counts how many cached passthrough interrupts have
bad affinity (receiving CPU is not running VCPU that is
the target of the virtual interrupt in the guest).
Signed-off-by: Suresh Warrier <redacted>
Signed-off-by: Paul Mackerras <redacted>
---
arch/powerpc/include/asm/kvm_host.h | 3 +++
arch/powerpc/kvm/book3s.c | 3 +++
arch/powerpc/kvm/book3s_hv_rm_xics.c | 18 +++++++++++++-----
3 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 3eb5092..f371a23 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h@@ -131,6 +131,9 @@ struct kvm_vcpu_stat { u32 ld_slow; u32 st_slow; #endif + u32 pthru_all; + u32 pthru_host; + u32 pthru_bad_aff; }; enum kvm_exit_types {
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 47018fc..6d0c45b 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c@@ -64,6 +64,9 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { { "ld_slow", VCPU_STAT(ld_slow) }, { "st", VCPU_STAT(st) }, { "st_slow", VCPU_STAT(st_slow) }, + { "pthru_all", VCPU_STAT(pthru_all) }, + { "pthru_host", VCPU_STAT(pthru_host) }, + { "pthru_bad_aff", VCPU_STAT(pthru_bad_aff) }, { NULL } };
diff --git a/arch/powerpc/kvm/book3s_hv_rm_xics.c b/arch/powerpc/kvm/book3s_hv_rm_xics.c
index 5f7527e..82ff5de 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_xics.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c@@ -716,11 +716,19 @@ int kvmppc_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr) icp->rm_eoied_irq = irq; } - if (state->host_irq && state->intr_cpu != -1) { - int pcpu = cpu_first_thread_sibling(raw_smp_processor_id()); - if (state->intr_cpu != pcpu) - xics_opal_rm_set_server(state->host_irq, pcpu); - state->intr_cpu = -1; + if (state->host_irq) { + ++vcpu->stat.pthru_all; + if (state->intr_cpu != -1) { + int pcpu = raw_smp_processor_id(); + + pcpu = cpu_first_thread_sibling(pcpu); + ++vcpu->stat.pthru_host; + if (state->intr_cpu != pcpu) { + ++vcpu->stat.pthru_bad_aff; + xics_opal_rm_set_server(state->host_irq, pcpu); + } + state->intr_cpu = -1; + } } bail: return check_too_hard(xics, icp);
--
2.8.1