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Thu, 18 Jul 2024 09:23:49 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DBEA22004D; Thu, 18 Jul 2024 09:23:46 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B17B120043; Thu, 18 Jul 2024 09:23:45 +0000 (GMT) Received: from li-1de7cd4c-3205-11b2-a85c-d27f97db1fe1.ibm.com (unknown [9.179.24.91]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTPS; Thu, 18 Jul 2024 09:23:45 +0000 (GMT) From: "Marc Hartmayer" To: Yu Zhao , Janosch Frank , kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , Andrew Morton , Muchun Song , David Hildenbrand , Frank van der Linden , Matthew Wilcox , Peter Xu , Yang Shi , linux-kernel@vger.kernel.org, ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com, Christian Borntraeger , Claudio Imbrenda , Heiko Carstens , Yosry Ahmed Subject: Re: [linux-next:master] [mm/hugetlb_vmemmap] 875fa64577: vm-scalability.throughput -34.3% regression In-Reply-To: References: <202407091001.1250ad4a-oliver.sang@intel.com> <3acefad9-96e5-4681-8014-827d6be71c7a@linux.ibm.com> Date: Thu, 18 Jul 2024 11:23:44 +0200 Message-ID: <875xt3dpen.fsf@linux.ibm.com> Content-Type: text/plain; charset=utf-8 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: CZX9u0F6eALlKMm8C6icAj4r9txRB6d9 X-Proofpoint-ORIG-GUID: VdC1-gG72XRKDWGg9xrl1LXn5vd61cRt Content-Transfer-Encoding: quoted-printable X-Proofpoint-UnRewURL: 0 URL was un-rewritten Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-18_06,2024-07-17_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=700 adultscore=0 impostorscore=0 clxscore=1011 mlxscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 priorityscore=1501 suspectscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2407180060 On Wed, Jul 17, 2024 at 09:44 AM -0600, Yu Zhao wrote: > On Wed, Jul 17, 2024 at 2:36=E2=80=AFAM Yu Zhao wrote: >> >> Hi Janosch and Oliver, >> >> On Wed, Jul 17, 2024 at 1:57=E2=80=AFAM Janosch Frank wrote: >> > >> > On 7/9/24 07:11, kernel test robot wrote: >> > > Hello, >> > > >> > > kernel test robot noticed a -34.3% regression of vm-scalability.thro= ughput on: >> > > >> > > >> > > commit: 875fa64577da9bc8e9963ee14fef8433f20653e7 ("mm/hugetlb_vmemma= p: fix race with speculative PFN walkers") >> > > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git mas= ter >> > > >> > > [still regression on linux-next/master 0b58e108042b0ed28a71cd7edf517= 5999955b233] >> > > >> > 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 run= time. >> >> Could you try the attached patch please? Thank you. > Hi, thanks a lot for the fix, it has fixed the problem on s390. --=20 Kind regards / Beste Gr=C3=BC=C3=9Fe Marc Hartmayer IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Wolfgang Wendt Gesch=C3=A4ftsf=C3=BChrung: David Faller Sitz der Gesellschaft: B=C3=B6blingen Registergericht: Amtsgericht Stuttgart, HRB 243294