Re: [linus:master] [madvise] 2f406263e3: stress-ng.mremap.ops_per_sec 6.7% regression

[David Hildenbrand]

On 29.11.24 08:49, kernel test robot wrote:
> Hello,
>
> kernel test robot noticed a 6.7% regression of stress-ng.mremap.ops_per_sec on:
>
>
> commit: 2f406263e3e954aa24c1248edcfa9be0c1bb30fa ("madvise:madvise_cold_or_pageout_pte_range(): don't use mapcount() against large folio for sharing check")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
> [still regression on fix commit cc864ebba5f612ce2960e7e09322a193e8fda0d7]
>
> testcase: stress-ng
> config: x86_64-rhel-8.3
> compiler: gcc-12
> test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory
> parameters:
>
> 	nr_threads: 100%
> 	testtime: 60s
> 	test: mremap
> 	cpufreq_governor: performance

A MADV_COLD / MADV_PAGEOUT patch for large folios / THP affecting a 
stress-ng mremap test (where propably no THP are used)?

Sounds unlikely ... ;)

--
Cheers,

David / dhildenb