Re: [PATCH v6 03/10] KVM: selftests: Use flag CLOCK_MONOTONIC_RAW for timing

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To: Yanan Wang <wangyanan55@xxxxxxxxxx>, Andrew Jones <drjones@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Subject: Re: [PATCH v6 03/10] KVM: selftests: Use flag CLOCK_MONOTONIC_RAW for timing
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Sat, 17 Apr 2021 15:23:15 +0200
Cc: Ben Gardon <bgardon@xxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Adrian Hunter <adrian.hunter@xxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Michael Kerrisk <mtk.manpages@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, wanghaibin.wang@xxxxxxxxxx, yuzenghui@xxxxxxxxxx
In-reply-to: <20210330080856.14940-4-wangyanan55@huawei.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0

On 30/03/21 10:08, Yanan Wang wrote:

In addition to function of CLOCK_MONOTONIC, flag CLOCK_MONOTONIC_RAW can
also shield possiable impact of NTP, which can provide more robustness.

Suggested-by: Vitaly Kuznetsov<vkuznets@xxxxxxxxxx>
Signed-off-by: Yanan Wang<wangyanan55@xxxxxxxxxx>
Reviewed-by: Ben Gardon<bgardon@xxxxxxxxxx>
Reviewed-by: Andrew Jones<drjones@xxxxxxxxxx>


I'm not sure about this one, is the effect visible?

Paolo

Follow-Ups:
- Re: [PATCH v6 03/10] KVM: selftests: Use flag CLOCK_MONOTONIC_RAW for timing
  - From: wangyanan (Y)

References:
- [PATCH v6 00/10] KVM: selftests: some improvement and a new test for kvm page table
  - From: Yanan Wang
- [PATCH v6 03/10] KVM: selftests: Use flag CLOCK_MONOTONIC_RAW for timing
  - From: Yanan Wang

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