linux-kernel - Re: [PATCH 7/9] KVM: VMX: abstract ple

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Date:	Wed, 20 Aug 2014 09:02:45 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	kvm@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, Gleb Natapov <gleb@...nel.org>,
	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>,
	Vinod Chegu <chegu_vinod@...com>, Hui-Zhi <hui-zhi.zhao@...com>
Subject: Re: [PATCH 7/9] KVM: VMX: abstract ple_window modifiers

Il 19/08/2014 22:35, Radim Krčmář ha scritto:
> They were almost identical and thus merged with a loathable macro.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  This solution is hopefully more acceptable than function pointers.

I think a little amount of duplication is not a problem.

Paolo

>  arch/x86/kvm/vmx.c | 53 +++++++++++++++++++----------------------------------
>  1 file changed, 19 insertions(+), 34 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index a236a9f..c6cfb71 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -5694,42 +5694,27 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
>  out:
>  	return ret;
>  }
> -
> -static void grow_ple_window(struct kvm_vcpu *vcpu)
> -{
> -	struct vcpu_vmx *vmx = to_vmx(vcpu);
> -	int old = vmx->ple_window;
> -	int new;
> -
> -	if (ple_window_grow < 1)
> -		new = ple_window;
> -	else if (ple_window_grow < ple_window)
> -		new = old * ple_window_grow;
> -	else
> -		new = old + ple_window_grow;
> -
> -	vmx->ple_window = min(new, ple_window_max);
> -
> -	trace_kvm_ple_window_grow(vcpu->vcpu_id, vmx->ple_window, old);
> +#define make_ple_window_modifier(type, oplt, opge, cmp, bound) \
> +static void type##_ple_window(struct kvm_vcpu *vcpu) \
> +{ \
> +	struct vcpu_vmx *vmx = to_vmx(vcpu); \
> +	int old = vmx->ple_window; \
> +	int new; \
> +\
> +	if (ple_window_##type < 1) \
> +		new = ple_window; \
> +	else if (ple_window_##type < ple_window) \
> +		new = old oplt ple_window_##type; \
> +	else \
> +		new = old opge ple_window_##type; \
> +\
> +	vmx->ple_window = cmp(new, bound); \
> +\
> +	trace_kvm_ple_window_##type(vcpu->vcpu_id, vmx->ple_window, old); \
>  }
>  
> -static void shrink_ple_window(struct kvm_vcpu *vcpu)
> -{
> -	struct vcpu_vmx *vmx = to_vmx(vcpu);
> -	int old = vmx->ple_window;
> -	int new;
> -
> -	if (ple_window_shrink < 1)
> -		new = ple_window;
> -	else if (ple_window_shrink < ple_window)
> -		new = old / ple_window_shrink;
> -	else
> -		new = old - ple_window_shrink;
> -
> -	vmx->ple_window = max(new, ple_window);
> -
> -	trace_kvm_ple_window_shrink(vcpu->vcpu_id, vmx->ple_window, old);
> -}
> +make_ple_window_modifier(grow,   *, +, min, ple_window_max)
> +make_ple_window_modifier(shrink, /, -, max, ple_window)
>  
>  /*
>   * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE
> 

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