[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <fd6287fc-c56f-4c08-0885-8ab32fdfeb7e@redhat.com>
Date: Tue, 18 Oct 2022 07:10:44 +0800
From: Gavin Shan <gshan@...hat.com>
To: "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
Sean Christopherson <seanjc@...gle.com>
Cc: 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 10/18/22 6:56 AM, Maciej S. Szmigiero wrote:
> On 18.10.2022 00:51, Gavin Shan wrote:
>> On 10/18/22 6:08 AM, Sean Christopherson wrote:
>>> 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.
>>>
>>
>> Ok. I will have one separate patch to define those sizes in kvm_util_base.h,
>> right after '#define NSEC_PER_SEC 1000000000L'. Sean, could you let me know
>> if it looks good to you?
>>
>> #define KB (1UL << 10)
>> #define MB (1UL << 20)
>> #define GB (1UL << 30)
>> #define TB (1UL << 40)
>>
>> /* Base page and huge page size */
>> #define SIZE_4KB ( 4 * KB)
>> #define SIZE_16KB ( 16 * KB)
>> #define SIZE_64KB ( 64 * KB)
>> #define SIZE_2MB ( 2 * MB)
>> #define SIZE_32MB ( 32 * MB)
>> #define SIZE_512MB (512 * MB)
>> #define SIZE_1GB ( 1 * GB)
>> #define SIZE_16GB ( 16 * GB)
>
> FYI, QEMU uses KiB, MiB, GiB, etc., see [1].
>
Right. I checked QEMU's definitions and it makes sense to use
KiB, MiB, GiB, TiB. I don't think we need PiB and EiB because
our tests don't use that large memory.
>
> [1]: https://git.qemu.org/?p=qemu.git;a=blob;f=include/qemu/units.h;hb=HEAD
>
Thanks,
Gavin
Powered by blists - more mailing lists