From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EB0F0D2F004 for ; Tue, 27 Jan 2026 12:16:53 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 602D36B0096; Tue, 27 Jan 2026 07:16:53 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5C0076B0098; Tue, 27 Jan 2026 07:16:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4F9E66B0099; Tue, 27 Jan 2026 07:16:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 3F9D46B0096 for ; Tue, 27 Jan 2026 07:16:53 -0500 (EST) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 10DFE531C8 for ; Tue, 27 Jan 2026 12:16:52 +0000 (UTC) X-FDA: 84377642706.17.92B38FB Received: from out-176.mta1.migadu.com (out-176.mta1.migadu.com [95.215.58.176]) by imf27.hostedemail.com (Postfix) with ESMTP id 497D04000E for ; Tue, 27 Jan 2026 12:16:51 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="wc/LzcSY"; spf=pass (imf27.hostedemail.com: domain of qi.zheng@linux.dev designates 95.215.58.176 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1769516211; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=e0pQYHM1jhSwp9PHWAhzAtLgw7dAo1EQ0j0b9Rhu8lM=; b=8rLXP4felfbgnioZ7Cdow2bGfkbHWr6FPW/va/9/Zv70TXiRkRP1pNYTdKL2FHhmiGWdrB uPMQlo+EEcXDR0n29sUG7/77ybSz+MDFqnspW1xhwEphtQjLVayNM2zjw/q1ChrtBxC5VZ WSzHQeFMz8fHC1mSvwTzAzb7QOq6WlU= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="wc/LzcSY"; spf=pass (imf27.hostedemail.com: domain of qi.zheng@linux.dev designates 95.215.58.176 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1769516211; a=rsa-sha256; cv=none; b=lBF1Y/Zwbmux3ZsP6B4Sc5L2tPRZlNIPOSN1xqSKwYqzFnS83p2Cas36CR10M3osHkg9Fr IrqirJb83o0CkHA9fIo4zCuj2EujY9OAeMmiSswnuP+ibU1gnNHvIn16RB7/ceUwN5G5Gv rj4FC8iYdVrq2iz7scd/jWEa7QOxiQw= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1769516209; 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=e0pQYHM1jhSwp9PHWAhzAtLgw7dAo1EQ0j0b9Rhu8lM=; b=wc/LzcSY84XUN/M01s5VcIBtD1/lXhQlVZzRwxMLJY1XGT2wxJOzGUzWA5oPCfbPCsb1/O ht9YXkU/ZBWYV/j9FZpfqWjqnjxWaip5QHGmFskLEMQc1kWqyHjiSkHOF+suDP3tIX1G7K JeMpI6zZYGFo3G12ozp0269DFGB3g9I= From: Qi Zheng To: david@kernel.org, andreas@gaisler.com, richard.weiyang@gmail.com, will@kernel.org, peterz@infradead.org, aneesh.kumar@kernel.org, npiggin@gmail.com, dev.jain@arm.com, ioworker0@gmail.com, linmag7@gmail.com, akpm@linux-foundation.org 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, sparclinux@vger.kernel.org, Qi Zheng , Richard Weinberger , Anton Ivanov , Johannes Berg Subject: [PATCH v4 6/8] um: mm: enable MMU_GATHER_RCU_TABLE_FREE Date: Tue, 27 Jan 2026 20:12:59 +0800 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Queue-Id: 497D04000E X-Rspamd-Server: rspam07 X-Stat-Signature: n6txyfwugwanz5w3eym8z4feydtz5c1i X-HE-Tag: 1769516211-300186 X-HE-Meta: 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 Y6nHzL+3 Tkfi3wVoBsmYEQuE1N4D9n5Upl89r2VNhtPXA0NiQ9bp/liWqEujQ2Y7G0RB2VNLRKl5bHtazVjEjLee0Xr1gbNQYtB/ydNZSv0P5c1PVsv4wdf/QEC0xrNsFPrbbFBK3fgxBBaMx3wr9RkAxSZePodT/b9KmMVrkX1dapd24UmbAabpxRBO1fW1dmuJ9k0qbHlbvnD8vn5X+1hGYR7FS6djdaaAE2GBG1K2Q9YsHRpS9XG4Akt8CWwDNrF//c30RDYphOpSAxJAY0me0XKuBW9ZJXS2B8mtcRU5YD6hh4v8gjXU8z4nC5OTyFOIk4GGY8KNkUZT7wIWggXsmU8LiNgq00LAAI7cKg1abhYTpRDfkQhQkG9fHygukZYMNMYCMYPHRWsvBs2MFPnwdNm+hCushwByoFtnu8R69 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 8415d39b0d430..098cda44db225 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -42,6 +42,7 @@ 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