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Message-ID: <5fcbf405-7e62-4b38-acc4-a9dd8cc91214@redhat.com>
Date: Wed, 20 Dec 2023 15:00:21 +0100
From: David Hildenbrand <david@...hat.com>
To: Ryan Roberts <ryan.roberts@....com>,
Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
Ard Biesheuvel <ardb@...nel.org>, Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>, James Morse <james.morse@....com>,
Suzuki K Poulose <suzuki.poulose@....com>, Zenghui Yu
<yuzenghui@...wei.com>, Andrey Ryabinin <ryabinin.a.a@...il.com>,
Alexander Potapenko <glider@...gle.com>,
Andrey Konovalov <andreyknvl@...il.com>, Dmitry Vyukov <dvyukov@...gle.com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Anshuman Khandual <anshuman.khandual@....com>,
Matthew Wilcox <willy@...radead.org>, Yu Zhao <yuzhao@...gle.com>,
Mark Rutland <mark.rutland@....com>, Kefeng Wang
<wangkefeng.wang@...wei.com>, John Hubbard <jhubbard@...dia.com>,
Zi Yan <ziy@...dia.com>, Barry Song <21cnbao@...il.com>,
Alistair Popple <apopple@...dia.com>, Yang Shi <shy828301@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 02/16] mm: Batch-copy PTE ranges during fork()
[...]
>>>
>>
>> gcc version 13.2.1 20231011 (Red Hat 13.2.1-4) (GCC)
>>
>> From Fedora 38. So "a bit" newer :P
>>
>
> I'll retry with newer toolchain.
>
> FWIW, with the code fix and the original compiler:
>
> Fork, order-0, Apple M2:
> | kernel | mean_rel | std_rel |
> |:----------------------|-----------:|----------:|
> | mm-unstable | 0.0% | 0.8% |
> | hugetlb-rmap-cleanups | 1.3% | 2.0% |
> | fork-batching | 4.3% | 1.0% |
>
> Fork, order-9, Apple M2:
> | kernel | mean_rel | std_rel |
> |:----------------------|-----------:|----------:|
> | mm-unstable | 0.0% | 0.8% |
> | hugetlb-rmap-cleanups | 0.9% | 0.9% |
> | fork-batching | -37.3% | 1.0% |
>
> Fork, order-0, Ampere Altra:
> | kernel | mean_rel | std_rel |
> |:----------------------|-----------:|----------:|
> | mm-unstable | 0.0% | 0.7% |
> | hugetlb-rmap-cleanups | 3.2% | 0.7% |
> | fork-batching | 5.5% | 1.1% |
>
> Fork, order-9, Ampere Altra:
> | kernel | mean_rel | std_rel |
> |:----------------------|-----------:|----------:|
> | mm-unstable | 0.0% | 0.1% |
> | hugetlb-rmap-cleanups | 0.5% | 0.1% |
> | fork-batching | -10.4% | 0.1% |
>
I just gave it another quick benchmark run on that Intel system.
hugetlb-rmap-cleanups -> fork-batching
order-0: 0.014114 -> 0.013848
-1.9%
order-9: 0.014262 -> 0.009410
-34%
Note that I disable SMT and turbo, and pin the test to one CPU, to make
the results as stable as possible. My kernel config has anything related
to debugging disabled.
--
Cheers,
David / dhildenb
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