| Message ID | 20240820043543.837914-2-suleiman@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: x86: Include host suspended time in steal time. | expand |
On Tue, Aug 20, 2024 at 01:35:41PM +0900, Suleiman Souhlal wrote: >It returns the cumulative nanoseconds that the host has been suspended. >It is intended to be used for reporting host suspend time to the guest. > >Signed-off-by: Suleiman Souhlal <suleiman@google.com> Reviewed-by: Chao Gao <chao.gao@intel.com> one nit below >--- > include/linux/kvm_host.h | 2 ++ > virt/kvm/kvm_main.c | 13 +++++++++++++ > 2 files changed, 15 insertions(+) > >diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h >index b23c6d48392f7c..8fec37b372d8c0 100644 >--- a/include/linux/kvm_host.h >+++ b/include/linux/kvm_host.h >@@ -2494,4 +2494,6 @@ long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu, > struct kvm_pre_fault_memory *range); > #endif > >+u64 kvm_total_suspend_ns(void); >+ > #endif >diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c >index cb2b78e92910fb..2235933d9247bc 100644 >--- a/virt/kvm/kvm_main.c >+++ b/virt/kvm/kvm_main.c >@@ -5720,6 +5720,15 @@ static void kvm_shutdown(void) > on_each_cpu(hardware_disable_nolock, NULL, 1); > } > >+static u64 last_suspend; >+static u64 total_suspend_ns; >+ >+u64 >+kvm_total_suspend_ns(void) nit: don't wrap before the function name. >+{ >+ return total_suspend_ns; >+} >+ > static int kvm_suspend(void) > { > /* >@@ -5735,6 +5744,8 @@ static int kvm_suspend(void) > > if (kvm_usage_count) > hardware_disable_nolock(NULL); >+ >+ last_suspend = ktime_get_boottime_ns(); > return 0; > } > >@@ -5745,6 +5756,8 @@ static void kvm_resume(void) > > if (kvm_usage_count) > WARN_ON_ONCE(__hardware_enable_nolock()); >+ >+ total_suspend_ns += ktime_get_boottime_ns() - last_suspend; > } > > static struct syscore_ops kvm_syscore_ops = { >-- >2.46.0.184.g6999bdac58-goog >
On Wed, Aug 21, 2024 at 2:40 PM Chao Gao <chao.gao@intel.com> wrote: > > On Tue, Aug 20, 2024 at 01:35:41PM +0900, Suleiman Souhlal wrote: > >It returns the cumulative nanoseconds that the host has been suspended. > >It is intended to be used for reporting host suspend time to the guest. > > > >Signed-off-by: Suleiman Souhlal <suleiman@google.com> > > Reviewed-by: Chao Gao <chao.gao@intel.com> > > one nit below > > >--- > > include/linux/kvm_host.h | 2 ++ > > virt/kvm/kvm_main.c | 13 +++++++++++++ > > 2 files changed, 15 insertions(+) > > > >diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > >index b23c6d48392f7c..8fec37b372d8c0 100644 > >--- a/include/linux/kvm_host.h > >+++ b/include/linux/kvm_host.h > >@@ -2494,4 +2494,6 @@ long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu, > > struct kvm_pre_fault_memory *range); > > #endif > > > >+u64 kvm_total_suspend_ns(void); > >+ > > #endif > >diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > >index cb2b78e92910fb..2235933d9247bc 100644 > >--- a/virt/kvm/kvm_main.c > >+++ b/virt/kvm/kvm_main.c > >@@ -5720,6 +5720,15 @@ static void kvm_shutdown(void) > > on_each_cpu(hardware_disable_nolock, NULL, 1); > > } > > > >+static u64 last_suspend; > >+static u64 total_suspend_ns; > >+ > >+u64 > >+kvm_total_suspend_ns(void) > > nit: don't wrap before the function name. Sorry, I completely missed that, even after Sean told me. Force of habit (FreeBSD style(9) says you have to do it). If I send another version I will fix that. -- Suleiman
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index b23c6d48392f7c..8fec37b372d8c0 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -2494,4 +2494,6 @@ long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu, struct kvm_pre_fault_memory *range); #endif +u64 kvm_total_suspend_ns(void); + #endif diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index cb2b78e92910fb..2235933d9247bc 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5720,6 +5720,15 @@ static void kvm_shutdown(void) on_each_cpu(hardware_disable_nolock, NULL, 1); } +static u64 last_suspend; +static u64 total_suspend_ns; + +u64 +kvm_total_suspend_ns(void) +{ + return total_suspend_ns; +} + static int kvm_suspend(void) { /* @@ -5735,6 +5744,8 @@ static int kvm_suspend(void) if (kvm_usage_count) hardware_disable_nolock(NULL); + + last_suspend = ktime_get_boottime_ns(); return 0; } @@ -5745,6 +5756,8 @@ static void kvm_resume(void) if (kvm_usage_count) WARN_ON_ONCE(__hardware_enable_nolock()); + + total_suspend_ns += ktime_get_boottime_ns() - last_suspend; } static struct syscore_ops kvm_syscore_ops = {
It returns the cumulative nanoseconds that the host has been suspended. It is intended to be used for reporting host suspend time to the guest. Signed-off-by: Suleiman Souhlal <suleiman@google.com> --- include/linux/kvm_host.h | 2 ++ virt/kvm/kvm_main.c | 13 +++++++++++++ 2 files changed, 15 insertions(+)