linux-kernel - Re: [PATCH 8/8] KVM: add debugfs file to show the number of async pf

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Date:	Wed, 27 Oct 2010 12:58:49 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 8/8] KVM: add debugfs file to show the number of async
 pf

On Wed, Oct 27, 2010 at 05:10:51PM +0800, Xiao Guangrong wrote:
> It can help us to see the state of async pf
> 
I have patch to add three async pf statistics:
apf_not_present
apf_present
apf_doublefault

But Avi now wants to deprecate debugfs interface completely and move
towards ftrace, so I had to drop it.

> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> ---
>  arch/x86/kvm/x86.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index c0e7ad0..2dd8059 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -88,6 +88,8 @@ static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
>  
>  #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
>  #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
> +#define VCPU_ASYNC_PF_STAT offsetof(struct kvm_vcpu, async_pf.queued), \
> +							KVM_STAT_VCPU
>  
>  static void update_cr8_intercept(struct kvm_vcpu *vcpu);
>  static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
> @@ -141,6 +143,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>  	{ "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
>  	{ "irq_injections", VCPU_STAT(irq_injections) },
>  	{ "nmi_injections", VCPU_STAT(nmi_injections) },
> +	{ "async_pf_queued", VCPU_ASYNC_PF_STAT},
>  	{ "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
>  	{ "mmu_pte_write", VM_STAT(mmu_pte_write) },
>  	{ "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
> -- 
> 1.7.0.4
> 
> --
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--
			Gleb.
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