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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id j8-20020a252308000000b00bf44703efd3sm1487805ybj.6.2023.06.26.21.44.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jun 2023 21:44:19 -0700 (PDT) Date: Mon, 26 Jun 2023 21:44:08 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@ripple.attlocal.net To: "Vishal Moola (Oracle)" cc: Andrew Morton , Matthew Wilcox , linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Hugh Dickins , Catalin Marinas , Huacai Chen , Geert Uytterhoeven , Thomas Bogendoerfer , Dinh Nguyen , Jonas Bonn , David Hildenbrand , Claudio Imbrenda , Paul Walmsley , "David S. Miller" , Richard Weinberger , Yoshinori Sato , Dave Hansen , Arnd Bergmann , Christophe Leroy Subject: Re: [PATCH v6 00/33] Split ptdesc from struct page In-Reply-To: <20230627031431.29653-1-vishal.moola@gmail.com> Message-ID: References: <20230627031431.29653-1-vishal.moola@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspamd-Queue-Id: 1E302180012 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 9m4q6ddt8r43zj9p9z4stbxm3msstqbk X-HE-Tag: 1687841060-904255 X-HE-Meta: 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 ShbiA4/R 5fVCPxX9cHSMOdPRpi1nnUdOu9pwEb0zaKCNle49S0voij1kv9nZpE9GQzTLlilN8r4edkoBbq6fPgs7NYyjnM0lVejBjM9baj50AdvMCNbAufr3axvXWitdaizQhgTu05BJ/lcrOY3f3ZwnWHV2OwCAcajOKvYIr1l8EiY8YHCY5oI7Msq12EhfAz8sARVjCKczlc7s2dwAv1fMdt+JI0+vAkm9jHoHLGtA+yVaq0rmmf9KshN/TBO2ONOirE3WZkBisOEXFaSNFypcwr8wgNNFzZbATrtRR/xq+dsmLdYgAzMa/MzqXuB5u5V9ugDihwOmFeIAYW4AvmpvVQeNevZ7MVET76Wj56bHjfq1bFCkavnXWMPTprdCmOHjBqJPUH67EqOCMOpsNIj1QiSaSTGsI0iCLNQ+kAAwzKtQNB6z50LtHK5Z2vY1hNQ== 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 Mon, 26 Jun 2023, Vishal Moola (Oracle) wrote: > The MM subsystem is trying to shrink struct page. This patchset > introduces a memory descriptor for page table tracking - struct ptdesc. ... > 39 files changed, 686 insertions(+), 455 deletions(-) I don't see the point of this patchset: to me it is just obfuscation of the present-day tight relationship between page table and struct page. Matthew already explained: > The intent is to get ptdescs to be dynamically allocated at some point > in the ~2-3 years out future when we have finished the folio project ... So in a kindly mood, I'd say that this patchset is ahead of its time. But I can certainly adapt to it, if everyone else sees some point to it. Hugh