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

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Message-ID: <ZpPD4Mz3t5xT87aN@xsang-OptiPlex-9020>
Date: Sun, 14 Jul 2024 20:26:08 +0800
From: Oliver Sang <oliver.sang@...el.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>, <oliver.sang@...el.com>
Subject: Re: [linux-next:master] [mm/hugetlb_vmemmap] 875fa64577:
 vm-scalability.throughput -34.3% regression

hi, Yu Zhao,

On Wed, Jul 10, 2024 at 12:22:40AM -0600, Yu Zhao wrote:
> On Mon, Jul 8, 2024 at 11:11 PM kernel test robot <oliver.sang@...el.com> 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")
> 
> This is likely caused by synchronize_rcu() wandering into the
> allocation path. I'll patch that up soon.
> 

we noticed this commit has already been merged into mainline

[bd225530a4c717714722c3731442b78954c765b3] mm/hugetlb_vmemmap: fix race with speculative PFN walkers
branch: linus/master

and the regression still exists in our tests. do you want us to test your
patch? Thanks!