linux-kernel - Re: [PATCH] kvm: x86: some tsc debug cleanup

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Message-Id: <499986B6-E3E3-4A43-A820-8D9B5E05F14B@gmail.com>
Date:   Mon, 15 Jul 2019 12:50:58 +0800
From:   Yi Wang <up2wing@...il.com>
To:     Yi Wang <wang.yi59@....com.cn>, Paolo Bonzini <pbonzini@...hat.com>
Cc:     pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        xue.zhihong@....com.cn, wang.liang82@....com.cn
Subject: Re: [PATCH] kvm: x86: some tsc debug cleanup

Hi Paolo,
Would you help to review this patch, plz?
Many thanks.

---
Best wishes
Yi Wang

> 在 2019年7月6日，01:10，Yi Wang <wang.yi59@....com.cn> 写道：
> 
> There are some pr_debug in TSC code, which may have
> been no use, so remove them as Paolo suggested.
> 
> Signed-off-by: Yi Wang <wang.yi59@....com.cn>
> ---
> arch/x86/kvm/x86.c | 8 --------
> 1 file changed, 8 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index fafd81d..86f9861 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1518,9 +1518,6 @@ static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz,
> 
>    *pshift = shift;
>    *pmultiplier = div_frac(scaled64, tps32);
> -
> -    pr_debug("%s: base_hz %llu => %llu, shift %d, mul %u\n",
> -         __func__, base_hz, scaled_hz, shift, *pmultiplier);
> }
> 
> #ifdef CONFIG_X86_64
> @@ -1763,12 +1760,10 @@ void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr)
>        vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
>        if (!kvm_check_tsc_unstable()) {
>            offset = kvm->arch.cur_tsc_offset;
> -            pr_debug("kvm: matched tsc offset for %llu\n", data);
>        } else {
>            u64 delta = nsec_to_cycles(vcpu, elapsed);
>            data += delta;
>            offset = kvm_compute_tsc_offset(vcpu, data);
> -            pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
>        }
>        matched = true;
>        already_matched = (vcpu->arch.this_tsc_generation == kvm->arch.cur_tsc_generation);
> @@ -1787,8 +1782,6 @@ void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr)
>        kvm->arch.cur_tsc_write = data;
>        kvm->arch.cur_tsc_offset = offset;
>        matched = false;
> -        pr_debug("kvm: new tsc generation %llu, clock %llu\n",
> -             kvm->arch.cur_tsc_generation, data);
>    }
> 
>    /*
> @@ -6857,7 +6850,6 @@ static void kvm_timer_init(void)
>        cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
>                      CPUFREQ_TRANSITION_NOTIFIER);
>    }
> -    pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
> 
>    cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online",
>              kvmclock_cpu_online, kvmclock_cpu_down_prep);
> -- 
> 1.8.3.1
>