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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1763537608; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nUnrWplutHBzvgR2dvaxPt91n3EUIlT8RN+kjzr9YeU=; b=W9W/9jbeN29NpXBktlOeuZdun6gLuLfTHYgZNBEnwmUPS2C7HbpVqgtF+wOLSoQrCR+nsv lZVMJmsyMyvFqrgawPm3nejPEj5RiAp+GDf2+i+BBoiZ9m3cs51DJAzOJ7V5PQ2Bu8uOUa OEIRgNRI0+JvdYgQt5MLrxebdOjajls= From: Qi Zheng To: will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com, peterz@infradead.org, dev.jain@arm.com, akpm@linux-foundation.org, david@kernel.org, ioworker0@gmail.com, linmag7@gmail.com Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-alpha@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-um@lists.infradead.org, Qi Zheng , Richard Weinberger , Anton Ivanov , Johannes Berg Subject: [PATCH v2 6/7] um: mm: enable MMU_GATHER_RCU_TABLE_FREE Date: Wed, 19 Nov 2025 15:31:23 +0800 Message-ID: <16ab9e6ce0febaf2fc383b7e09e3f1fb2ad63a40.1763537007.git.zhengqi.arch@bytedance.com> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam12 X-Rspam-User: X-Rspamd-Queue-Id: EC1A4180002 X-Stat-Signature: 7t49a8t3mrbg6njbah1gfj7pdd1cu13e X-HE-Tag: 1763537609-606195 X-HE-Meta: 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 0y/gZ9zs ugXasU2s4Xd2x6UVIDtLxQxUVIBPvJ40GKCSYaTdAF/AxKggZLj0mr0vGfQxIpb6PZ70EzFItzSzpOmp314t2D1f/5WbPWUUsFQAwt2c0dd9mvGbtRByRdIhyClcfFVe11bHhN+/2zyQsWTObjI01ujrMZEwQqnDU9BejARgfJda/5hBaUrXXKqHT0ZERj5ExUeOC4EK0o2wQ351EvdwiX+vNoAPiWcAT+o1R843MKeawqdqsaRkO5SFnMGnFdmDTUlvuePENuplk3nk4XfpEL/JvxaLhYl3GdYfJFzyJrIYZQf9r57+XQvtr0jVNkygsGzNU7FumTQWF0LLJeVVL5Op3DAEvJd8GAYeS 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: List-Subscribe: List-Unsubscribe: From: Qi Zheng 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, first enable MMU_GATHER_RCU_TABLE_FREE to prepare for enabling the PT_RECLAIM feature, which resolves this problem. Signed-off-by: Qi Zheng Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg --- arch/um/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 097c6a6265ef3..47a41bc77bb24 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -41,6 +41,7 @@ config UML select HAVE_SYSCALL_TRACEPOINTS select THREAD_INFO_IN_TASK select SPARSE_IRQ + select MMU_GATHER_RCU_TABLE_FREE config MMU bool -- 2.20.1