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

[Ryan Roberts]

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