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

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Message-ID: <92dd9aa1-a23d-bc80-6a36-9732a6a730e2@redhat.com>
Date:   Mon, 15 Jul 2019 13:56:45 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Yi Wang <up2wing@...il.com>, Yi Wang <wang.yi59@....com.cn>
Cc:     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

On 15/07/19 06:50, Yi Wang wrote:
> Hi Paolo,
> Would you help to review this patch, plz?
> Many thanks.

I have queued it now.

Paolo

> ---
> 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
>>