linux-kernel - Re: [linux-next:master] [mm/hugetlb_vmemmap] 875fa64577: vm-scalability.throughput -34.3% regression

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Message-ID: <3acefad9-96e5-4681-8014-827d6be71c7a@linux.ibm.com>
Date: Wed, 17 Jul 2024 09:52:51 +0200
From: Janosch Frank <frankja@...ux.ibm.com>
To: Yu Zhao <yuzhao@...gle.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <muchun.song@...ux.dev>,
        David Hildenbrand <david@...hat.com>,
        Frank van der Linden <fvdl@...gle.com>,
        Matthew Wilcox
 <willy@...radead.org>, Peter Xu <peterx@...hat.com>,
        Yang Shi <yang@...amperecomputing.com>, linux-kernel@...r.kernel.org,
        ying.huang@...el.com, feng.tang@...el.com, fengwei.yin@...el.com,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Marc Hartmayer <mhartmay@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: Re: [linux-next:master] [mm/hugetlb_vmemmap] 875fa64577:
 vm-scalability.throughput -34.3% regression

On 7/9/24 07:11, kernel test robot wrote:
> Hello,
> 
> kernel test robot noticed a -34.3% regression of vm-scalability.throughput on:
> 
> 
> commit: 875fa64577da9bc8e9963ee14fef8433f20653e7 ("mm/hugetlb_vmemmap: fix race with speculative PFN walkers")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> 
> [still regression on linux-next/master 0b58e108042b0ed28a71cd7edf5175999955b233]
>
This has hit s390 huge page backed KVM guests as well.
Our simple start/stop test case went from ~5 to over 50 seconds of runtime.