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

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Message-ID: <875xt3dpen.fsf@linux.ibm.com>
Date: Thu, 18 Jul 2024 11:23:44 +0200
From: "Marc Hartmayer" <mhartmay@...ux.ibm.com>
To: Yu Zhao <yuzhao@...gle.com>, Janosch Frank <frankja@...ux.ibm.com>,
        kernel test robot <oliver.sang@...el.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>,
        Heiko Carstens
 <hca@...ux.ibm.com>,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: Re: [linux-next:master] [mm/hugetlb_vmemmap] 875fa64577:
 vm-scalability.throughput -34.3% regression

On Wed, Jul 17, 2024 at 09:44 AM -0600, Yu Zhao <yuzhao@...gle.com> wrote:
> On Wed, Jul 17, 2024 at 2:36 AM Yu Zhao <yuzhao@...gle.com> wrote:
>>
>> Hi Janosch and Oliver,
>>
>> On Wed, Jul 17, 2024 at 1:57 AM Janosch Frank <frankja@...ux.ibm.com> wrote:
>> >
>> > 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.
>>
>> Could you try the attached patch please? Thank you.
>

Hi,

thanks a lot for the fix, it has fixed the problem on s390.

-- 
Kind regards / Beste Grüße
   Marc Hartmayer

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