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[35.247.111.240]) by smtp.gmail.com with ESMTPSA id b18sm2065pfb.197.2021.02.09.09.35.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Feb 2021 09:35:10 -0800 (PST) Date: Tue, 9 Feb 2021 17:35:07 +0000 From: Sean Christopherson To: Ben Gardon Cc: "wangyanan (Y)" , kvm , linux-kselftest@vger.kernel.org, LKML , Paolo Bonzini , Shuah Khan , Andrew Jones , Marc Zyngier , Peter Xu , Aaron Lewis , Vitaly Kuznetsov , wanghaibin.wang@huawei.com, yuzenghui@huawei.com Subject: Re: [RFC PATCH 1/2] KVM: selftests: Add a macro to get string of vm_mem_backing_src_type Message-ID: References: <20210208090841.333724-1-wangyanan55@huawei.com> <20210208090841.333724-2-wangyanan55@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 09, 2021, Ben Gardon wrote: > On Tue, Feb 9, 2021 at 3:21 AM wangyanan (Y) wrote: > > > > > > On 2021/2/9 2:13, Ben Gardon wrote: > > > On Mon, Feb 8, 2021 at 1:08 AM Yanan Wang 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.