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From: Muchun Song In-Reply-To: Date: Mon, 15 Jul 2024 10:40:43 +0800 Cc: Yu Zhao , oe-lkp@lists.linux.dev, kernel test robot , Linux Memory Management List , Andrew Morton , David Hildenbrand , Frank van der Linden , Matthew Wilcox , Peter Xu , Yang Shi , LKML , Huang Ying , Feng Tang , Yin Fengwei Content-Transfer-Encoding: quoted-printable Message-Id: References: <202407091001.1250ad4a-oliver.sang@intel.com> To: Oliver Sang X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 0FAA1A0006 X-Stat-Signature: gjbbntsn8z9cnq8pj4mgq57i59r9rqte X-Rspam-User: X-HE-Tag: 1721011291-283471 X-HE-Meta: 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 2i7YxfBc 8gM2rACDLyucb4F/fPiRbmfEZzyor2Ad9v9ANArqYqWTptN3Vm6msX5d7mk/Xgv4W60DZBGvPMfYtib2enCntV8nNffnzMltRKXmSwH1vqj8ZbDVrF60jOsYFEmOURh+7uGDaeMwAjCu87wKT7b0m2LEayPmUwqbNr/B8UJSMgUmyqCtCKkIdHxLqvlArMc6U2TPqajTzNHGevfg2B+op50mduiJ5ZWeH8Vr1/++xOTZAQv5LLa2XG3+reN3k35M2dtgB0Bi6PSyyHrG43xb4q6zEJTtVCWhGQC+4 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > On Jul 14, 2024, at 20:26, Oliver Sang wrote: >=20 > hi, Yu Zhao, >=20 > On Wed, Jul 10, 2024 at 12:22:40AM -0600, Yu Zhao wrote: >> On Mon, Jul 8, 2024 at 11:11=E2=80=AFPM kernel test robot = wrote: >>>=20 >>> Hello, >>>=20 >>> kernel test robot noticed a -34.3% regression of = vm-scalability.throughput on: >>>=20 >>>=20 >>> commit: 875fa64577da9bc8e9963ee14fef8433f20653e7 = ("mm/hugetlb_vmemmap: fix race with speculative PFN walkers") >>=20 >> This is likely caused by synchronize_rcu() wandering into the >> allocation path. I'll patch that up soon. >>=20 >=20 > we noticed this commit has already been merged into mainline >=20 > [bd225530a4c717714722c3731442b78954c765b3] mm/hugetlb_vmemmap: fix = race with speculative PFN walkers > branch: linus/master Did you test with HVO enabled (there are two ways to enable HVO: 1) = adding cmdline with "hugetlb_free_vmemmap=3Don" or 2) write 1 to /proc/sys/vm/hugetlb_optimize_vmemmap)? I want to = confirm if the regression is related to HVO routine. Thanks. >=20 > and the regression still exists in our tests. do you want us to test = your > patch? Thanks!