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Sat, 27 Jun 2020 19:03:04 +0000 Date: Sat, 27 Jun 2020 20:03:04 +0100 From: Matthew Wilcox To: Mike Rapoport Cc: linux-kernel@vger.kernel.org, Abdul Haleem , Andrew Morton , Andy Lutomirski , Arnd Bergmann , Christophe Leroy , Joerg Roedel , Max Filippov , Mike Rapoport , Peter Zijlstra , Satheesh Rajendran , Stafford Horne , Stephen Rothwell , Steven Rostedt , linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, linuxppc-dev@lists.ozlabs.org, openrisc@lists.librecores.org, sparclinux@vger.kernel.org Subject: Re: [PATCH 4/8] asm-generic: pgalloc: provide generic pmd_alloc_one() and pmd_free_one() Message-ID: <20200627190304.GG25039@casper.infradead.org> References: <20200627143453.31835-1-rppt@kernel.org> <20200627143453.31835-5-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200627143453.31835-5-rppt@kernel.org> X-Rspamd-Queue-Id: 677EA2000235C759 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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, Jun 27, 2020 at 05:34:49PM +0300, Mike Rapoport wrote: > More elaborate versions on arm64 and x86 account memory for the user page > tables and call to pgtable_pmd_page_ctor() as the part of PMD page > initialization. > > Move the arm64 version to include/asm-generic/pgalloc.h and use the generic > version on several architectures. > > The pgtable_pmd_page_ctor() is a NOP when ARCH_ENABLE_SPLIT_PMD_PTLOCK is > not enabled, so there is no functional change for most architectures except > of the addition of __GFP_ACCOUNT for allocation of user page tables. Thanks for including this line; it reminded me that we're not setting the PageTable flag on the page, nor accounting it to the zone page stats. Hope you don't mind me tagging a patch to do that on as 9/8. We could also do with a pud_page_[cd]tor and maybe even p4d/pgd versions. But that brings me to the next question -- could/should some of this be moved over to asm-generic/pgalloc.h? The ctor/dtor aren't called from anywhere else, and there's value to reducing the total amount of code in mm.h, but then there's also value to keeping all the ifdef ARCH_ENABLE_SPLIT_PMD_PTLOCK code together too. So I'm a bit torn. What do you think?