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Tue, 18 Nov 2025 03:55:16 -0800 (PST) Message-ID: Date: Tue, 18 Nov 2025 19:53:50 +0800 Precedence: bulk X-Mailing-List: linux-parisc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/7] enable PT_RECLAIM on all 64-bit architectures To: "David Hildenbrand (Red Hat)" , Qi Zheng , will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com, peterz@infradead.org, dev.jain@arm.com, akpm@linux-foundation.org, ioworker0@gmail.com Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-um@lists.infradead.org, Qi Zheng References: <83e88171-54cb-4112-a344-f6a7d7f13784@kernel.org> From: Qi Zheng In-Reply-To: <83e88171-54cb-4112-a344-f6a7d7f13784@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/18/25 12:53 AM, David Hildenbrand (Red Hat) wrote: > On 14.11.25 12:11, Qi Zheng wrote: >> From: Qi Zheng >> >> Hi all, >> >> This series aims to enable PT_RECLAIM on all 64-bit architectures. >> >> On a 64-bit system, madvise(MADV_DONTNEED) may cause a large number of >> empty PTE >> page table pages (such as 100GB+). To resolve this problem, we need to >> enable >> PT_RECLAIM, which depends on MMU_GATHER_RCU_TABLE_FREE. >> > > Makes sense! > >> Therefore, this series first enables MMU_GATHER_RCU_TABLE_FREE on all >> 64-bit >> architectures, and finally makes PT_RECLAIM depend on >> MMU_GATHER_RCU_TABLE_FREE >> && 64BIT. This way, PT_RECLAIM can be enabled by default on all 64-bit >> architectures. > > Could we then even go ahead and stop making PT_RECLAIM user-selectable? OK, will change to: config PT_RECLAIM def_bool y depends on MMU_GATHER_RCU_TABLE_FREE && MMU && SMP && 64BIT >