linux-kernel - Re: [RFC PATCH 1/2] KVM: selftests: Add a macro to get string of vm_mem_backing_src

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Message-ID: <bf173f0c-1694-8a31-4f96-55f821818cd1@huawei.com>
Date:   Wed, 10 Feb 2021 12:11:37 +0800
From:   "wangyanan (Y)" <wangyanan55@...wei.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Ben Gardon <bgardon@...gle.com>
CC:     kvm <kvm@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Andrew Jones <drjones@...hat.com>,
        Marc Zyngier <maz@...nel.org>, Peter Xu <peterx@...hat.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        <wanghaibin.wang@...wei.com>, <yuzenghui@...wei.com>
Subject: Re: [RFC PATCH 1/2] KVM: selftests: Add a macro to get string of
 vm_mem_backing_src_type


On 2021/2/10 1:35, Sean Christopherson wrote:
> On Tue, Feb 09, 2021, Ben Gardon wrote:
>> On Tue, Feb 9, 2021 at 3:21 AM wangyanan (Y) <wangyanan55@...wei.com> wrote:
>>>
>>> On 2021/2/9 2:13, Ben Gardon wrote:
>>>> On Mon, Feb 8, 2021 at 1:08 AM Yanan Wang <wangyanan55@...wei.com> wrote:
>>>>> Add a macro to get string of the backing source memory type, so that
>>>>> application can add choices for source types in the help() function,
>>>>> and users can specify which type to use for testing.
>>>> Coincidentally, I sent out a change last week to do the same thing:
>>>> "KVM: selftests: Add backing src parameter to dirty_log_perf_test"
>>>> (https://lkml.org/lkml/2021/2/2/1430)
>>>> Whichever way this ends up being implemented, I'm happy to see others
>>>> interested in testing different backing source types too.
>>> Thanks Ben! I have a little question here.
>>>
>>> Can we just present three IDs (0/1/2) but not strings for users to
>>> choose which backing_src_type to use like the way of guest modes,
>> That would be fine with me. The string names are easier for me to read
>> than an ID number (especially if you were to add additional options
>> e.g. 1G hugetlb or file backed  / shared memory) but it's mostly an
>> aesthetic preference, so I don't have strong feelings either way.
> I vote to expose/consume strings, being able to do ".dirty_log_perf_test --help"
> and understand the backing options without having to dig into source was super
> nice.
> .
Fine then:), I will make some change based on 
(https://lkml.org/lkml/2021/2/2/1430), thanks!