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

[Uladzislau Rezki]

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 :)

--
Uladzislau Rezki