linux-kernel - Re: [linus:master] [madvise] 2f406263e3: stress-ng.mremap.ops_per

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Message-ID: <e08c88bf-8aa0-4b18-9d8a-77f1a60436e7@redhat.com>
Date: Fri, 29 Nov 2024 10:45:51 +0100
From: David Hildenbrand <david@...hat.com>
To: kernel test robot <oliver.sang@...el.com>,
 Yin Fengwei <fengwei.yin@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org,
 Andrew Morton <akpm@...ux-foundation.org>, Yu Zhao <yuzhao@...gle.com>,
 Ryan Roberts <ryan.roberts@....com>, Kefeng Wang
 <wangkefeng.wang@...wei.com>, Matthew Wilcox <willy@...radead.org>,
 Minchan Kim <minchan@...nel.org>, Vishal Moola <vishal.moola@...il.com>,
 Yang Shi <shy828301@...il.com>, linux-mm@...ck.org
Subject: Re: [linus:master] [madvise] 2f406263e3: stress-ng.mremap.ops_per_sec
 6.7% regression

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