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Tue, 4 Jul 2023 13:40:46 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C987920040; Tue, 4 Jul 2023 13:40:45 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 522B92004F; Tue, 4 Jul 2023 13:40:44 +0000 (GMT) Received: from li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com (unknown [9.155.204.135]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTPS; Tue, 4 Jul 2023 13:40:44 +0000 (GMT) Date: Tue, 4 Jul 2023 15:40:43 +0200 From: Alexander Gordeev To: Hugh Dickins Cc: Gerald Schaefer , Jason Gunthorpe , Andrew Morton , Vasily Gorbik , Mike Kravetz , Mike Rapoport , "Kirill A. Shutemov" , Matthew Wilcox , David Hildenbrand , Suren Baghdasaryan , Qi Zheng , Yang Shi , Mel Gorman , Peter Xu , Peter Zijlstra , Will Deacon , Yu Zhao , Alistair Popple , Ralph Campbell , Ira Weiny , Steven Price , SeongJae Park , Lorenzo Stoakes , Huang Ying , Naoya Horiguchi , Christophe Leroy , Zack Rusin , Axel Rasmussen , Anshuman Khandual , Pasha Tatashin , Miaohe Lin , Minchan Kim , Christoph Hellwig , Song Liu , Thomas Hellstrom , Russell King , "David S. Miller" , Michael Ellerman , "Aneesh Kumar K.V" , Heiko Carstens , Christian Borntraeger , Claudio Imbrenda , Jann Horn , Vishal Moola , Vlastimil Babka , linux-arm-kernel@lists.infradead.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 07/12] s390: add pte_free_defer() for pgtables sharing page Message-ID: References: <54cb04f-3762-987f-8294-91dafd8ebfb0@google.com> <20230628211624.531cdc58@thinkpad-T15> <20230629175645.7654d0a8@thinkpad-T15> <7bef5695-fa4a-7215-7e9d-d4a83161c7ab@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7bef5695-fa4a-7215-7e9d-d4a83161c7ab@google.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: BtBza05dswPGCwLp6PNd7IQX4Cdszb6T X-Proofpoint-GUID: ksrVlFb-3Vd1Kbm-HDCPBScRUs9lmkUF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-04_08,2023-07-04_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 clxscore=1015 malwarescore=0 phishscore=0 mlxlogscore=999 adultscore=0 mlxscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307040116 X-Rspam-User: X-Stat-Signature: eixhuepcoy6djepphthxobqtkss4xxpc X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 9395340010 X-HE-Tag: 1688478106-818045 X-HE-Meta: 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 bPh5X1pa sYhB7c5hQ7hKteErga5I+xFWNq12/jpBxfBP9sOmNi4MI7rBcw+obrXZDsQbjR3e0jJ4qbZZ7zhAmLGZ+1u2malLEAgaip8USHj+U/j5V77SZIsNm7CBbEt3PNkjXewTZ0/MgImMPEdIuXQd230YwbWMB9IU7/y4mFTv974ZSq+LgObfXoBjs8rIUhljmOyLbbaMt7NelY+iniz122XFrwz96g5tbQ4wWn9nUmnH6LvzxyF6h43j8Tu/30hzxPCleUdT3LyoBDhnKt2HzJgbNLlvNG2n03GXLHSGnlYlp0H3mKD8= 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: On Sat, Jul 01, 2023 at 09:32:38PM -0700, Hugh Dickins wrote: > On Thu, 29 Jun 2023, Hugh Dickins wrote: Hi Hugh, ... > No, not quite the same rules as before: I came to realize that using > list_add_tail() for the HH pages would be liable to put a page on the > list which forever blocked reuse of PP list_add_tail() pages after it > (could be solved by a list_move() somewhere, but we have agreed to > prefer simplicity). Just to make things more clear for me: do I understand correctly that this was an attempt to add HH fragments to pgtable_list from pte_free_defer()? Thanks!