linux-kernel - Re: [PATCH v3 00/11] Perf improvements for hugetlb and vmalloc on arm64

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Message-ID: <5582c321-9297-4d92-9e1f-497afa17f8be@arm.com>
Date: Thu, 27 Mar 2025 09:46:35 -0400
From: Ryan Roberts <ryan.roberts@....com>
To: Uladzislau Rezki <urezki@...il.com>
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Pasha Tatashin <pasha.tatashin@...een.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Christoph Hellwig <hch@...radead.org>, David Hildenbrand <david@...hat.com>,
 "Matthew Wilcox (Oracle)" <willy@...radead.org>,
 Mark Rutland <mark.rutland@....com>,
 Anshuman Khandual <anshuman.khandual@....com>,
 Alexandre Ghiti <alexghiti@...osinc.com>,
 Kevin Brodsky <kevin.brodsky@....com>, linux-arm-kernel@...ts.infradead.org,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/11] Perf improvements for hugetlb and vmalloc on
 arm64

On 27/03/2025 08:16, Uladzislau Rezki wrote:
> On Tue, Mar 04, 2025 at 03:04:30PM +0000, Ryan Roberts wrote:
>> Hi All,
>>
>> This is v3 of a series to improve performance for hugetlb and vmalloc on arm64.
>> Although some of these patches are core-mm, advice from Andrew was to go via the
>> arm64 tree. Hopefully I can get some ACKs from mm folks.
>>
>> The 2 key performance improvements are 1) enabling the use of contpte-mapped
>> blocks in the vmalloc space when appropriate (which reduces TLB pressure). There
>> were already hooks for this (used by powerpc) but they required some tidying and
>> extending for arm64. And 2) batching up barriers when modifying the vmalloc
>> address space for upto 30% reduction in time taken in vmalloc().
>>
>> vmalloc() performance was measured using the test_vmalloc.ko module. Tested on
>> Apple M2 and Ampere Altra. Each test had loop count set to 500000 and the whole
>> test was repeated 10 times.
>>
> I will have a look and review just give me some time :)

Thanks for the reviews - appreciate it!

> 
> --
> Uladzislau Rezki