linux-kernel - Re: [PATCH 5/6] KVM: selftests: memslot_perf

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Message-ID: <Y03ScGUUCA1KwlLF@google.com>
Date:   Mon, 17 Oct 2022 22:08:48 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:     Gavin Shan <gshan@...hat.com>, kvmarm@...ts.cs.columbia.edu,
        kvmarm@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, ajones@...tanamicro.com,
        pbonzini@...hat.com, maz@...nel.org, shuah@...nel.org,
        oliver.upton@...ux.dev, peterx@...hat.com, ricarkol@...gle.com,
        zhenyzha@...hat.com, shan.gavin@...il.com
Subject: Re: [PATCH 5/6] KVM: selftests: memslot_perf_test: Consolidate
 memory sizes

On Mon, Oct 17, 2022, Maciej S. Szmigiero wrote:
> > +#define MEM_EXTRA_SIZE		0x10000
>
> Also, an expression like "(64 << 10)" is more readable than a "1"
> with a tail of zeroes (it's easy to add one zero too many or be one
> zero short).

+1 to not open coding raw numbers.

I think it's high time KVM selftests add #defines for the common sizes, e.g. SIZE_4KB,
16KB, 64K, 2MB, 1GB, etc...

Alternatively (or in addition), just #define 1KB, 1MB, 1GB, and 1TB, and then do
math off of those.