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KVM: Add fpu_reload counter

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Measure the number of times we switch the fpu state.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-11-18 13:54:33 +02:00
parent e1beb1d37c
commit f096ed8588
2 changed files with 3 additions and 0 deletions
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1
drivers/kvm/kvm.h
View file

@ -248,6 +248,7 @@ struct kvm_stat {
u32 irq_exits;
u32 host_state_reload;
u32 efer_reload;
u32 fpu_reload;
};
struct kvm_io_device {

2
drivers/kvm/x86.c
View file

@ -62,6 +62,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "irq_exits", STAT_OFFSET(irq_exits) },
{ "host_state_reload", STAT_OFFSET(host_state_reload) },
{ "efer_reload", STAT_OFFSET(efer_reload) },
{ "fpu_reload", STAT_OFFSET(fpu_reload) },
{ NULL }
};
@ -2417,6 +2418,7 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
vcpu->guest_fpu_loaded = 0;
fx_save(&vcpu->guest_fx_image);
fx_restore(&vcpu->host_fx_image);
++vcpu->stat.fpu_reload;
}
EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);