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Date: Tue, 16 Oct 2012 21:24:27 -0500
From: Michael Wolf <mjw@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org, peterz@...radead.org, mtosatti@...hat.com,
glommer@...allels.com, mingo@...hat.com, avi@...hat.com,
anthony@...emonkey.ws
Subject: [PATCH RFC V2 3/5] Add the code to send the consigned time from the
host to the guest
Add the code to send the consigned time from the host to the guest
Signed-off-by: Michael Wolf <mjw@...ux.vnet.ibm.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/include/asm/kvm_para.h | 3 ++-
arch/x86/include/asm/paravirt.h | 4 ++--
arch/x86/kernel/kvm.c | 3 ++-
arch/x86/kvm/x86.c | 2 ++
include/linux/kernel_stat.h | 1 +
kernel/sched/cputime.c | 21 +++++++++++++++++++--
kernel/sched/sched.h | 2 ++
8 files changed, 31 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 1eaa6b0..bd4e412 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -409,6 +409,7 @@ struct kvm_vcpu_arch {
u64 msr_val;
u64 last_steal;
u64 accum_steal;
+ u64 accum_consigned;
struct gfn_to_hva_cache stime;
struct kvm_steal_time steal;
} st;
diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 2f7712e..debe72e 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -42,9 +42,10 @@
struct kvm_steal_time {
__u64 steal;
+ __u64 consigned;
__u32 version;
__u32 flags;
- __u32 pad[12];
+ __u32 pad[10];
};
#define KVM_STEAL_ALIGNMENT_BITS 5
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index a5f9f30..d39e8d0 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -196,9 +196,9 @@ struct static_key;
extern struct static_key paravirt_steal_enabled;
extern struct static_key paravirt_steal_rq_enabled;
-static inline u64 paravirt_steal_clock(int cpu, u64 *steal)
+static inline u64 paravirt_steal_clock(int cpu, u64 *steal, u64 *consigned)
{
- PVOP_VCALL2(pv_time_ops.steal_clock, cpu, steal);
+ PVOP_VCALL3(pv_time_ops.steal_clock, cpu, steal, consigned);
}
static inline unsigned long long paravirt_read_pmc(int counter)
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 91b3b2a..4e5582a 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -368,7 +368,7 @@ static struct notifier_block kvm_pv_reboot_nb = {
.notifier_call = kvm_pv_reboot_notify,
};
-static u64 kvm_steal_clock(int cpu, u64 *steal)
+static u64 kvm_steal_clock(int cpu, u64 *steal, u64 *consigned)
{
struct kvm_steal_time *src;
int version;
@@ -378,6 +378,7 @@ static u64 kvm_steal_clock(int cpu, u64 *steal)
version = src->version;
rmb();
*steal = src->steal;
+ *consigned = src->consigned;
rmb();
} while ((version & 1) || (version != src->version));
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1f09552..801cfa8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1554,8 +1554,10 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
return;
vcpu->arch.st.steal.steal += vcpu->arch.st.accum_steal;
+ vcpu->arch.st.steal.consigned += vcpu->arch.st.accum_consigned;
vcpu->arch.st.steal.version += 2;
vcpu->arch.st.accum_steal = 0;
+ vcpu->arch.st.accum_consigned = 0;
kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
&vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index c0b0095..253fdce 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -125,6 +125,7 @@ extern unsigned long long task_delta_exec(struct task_struct *);
extern void account_user_time(struct task_struct *, cputime_t, cputime_t);
extern void account_system_time(struct task_struct *, int, cputime_t, cputime_t);
extern void account_steal_time(cputime_t);
+extern void account_consigned_time(cputime_t);
extern void account_idle_time(cputime_t);
extern void account_process_tick(struct task_struct *, int user);
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index dd3fd46..bf2025a 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -244,6 +244,18 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
}
/*
+ * This accounts for the time that is split out of steal time.
+ * Consigned time represents the amount of time that the cpu was
+ * expected to be somewhere else.
+ */
+void account_consigned_time(cputime_t cputime)
+{
+ u64 *cpustat = kcpustat_this_cpu->cpustat;
+
+ cpustat[CPUTIME_CONSIGN] += (__force u64) cputime;
+}
+
+/*
* Account for involuntary wait time.
* @cputime: the cpu time spent in involuntary wait
*/
@@ -274,15 +286,20 @@ static __always_inline bool steal_account_process_tick(void)
#ifdef CONFIG_PARAVIRT
if (static_key_false(¶virt_steal_enabled)) {
u64 steal, st = 0;
+ u64 consigned, cs = 0;
- paravirt_steal_clock(smp_processor_id(), &steal);
+ paravirt_steal_clock(smp_processor_id(), &steal, &consigned);
steal -= this_rq()->prev_steal_time;
+ consigned -= this_rq()->prev_consigned_time;
st = steal_ticks(steal);
+ cs = steal_ticks(consigned);
this_rq()->prev_steal_time += st * TICK_NSEC;
+ this_rq()->prev_consigned_time += cs * TICK_NSEC;
account_steal_time(st);
- return st;
+ account_consigned_time(cs);
+ return st || cs;
}
#endif
return false;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 3060136..64e4cf9 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -436,9 +436,11 @@ struct rq {
#endif
#ifdef CONFIG_PARAVIRT
u64 prev_steal_time;
+ u64 prev_consigned_time;
#endif
#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
u64 prev_steal_time_rq;
+ u64 prev_consigned_time_rq;
#endif
/* calc_load related fields */
--
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