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 B2E73CE7AEA for ; Fri, 14 Nov 2025 11:14:09 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 095468E0014; Fri, 14 Nov 2025 06:14:09 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 06CD18E0002; Fri, 14 Nov 2025 06:14:09 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EC4348E0014; Fri, 14 Nov 2025 06:14:08 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id DC26B8E0002 for ; Fri, 14 Nov 2025 06:14:08 -0500 (EST) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id A492B1602FF for ; Fri, 14 Nov 2025 11:14:08 +0000 (UTC) X-FDA: 84108953376.22.BB8B443 Received: from out-180.mta0.migadu.com (out-180.mta0.migadu.com [91.218.175.180]) by imf06.hostedemail.com (Postfix) with ESMTP id E674718000C for ; Fri, 14 Nov 2025 11:14:06 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=L48H43W4; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf06.hostedemail.com: domain of qi.zheng@linux.dev designates 91.218.175.180 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1763118847; a=rsa-sha256; cv=none; b=t7VR+hFFha6yN3vrPwTgOLpC89BkqIP4q9dpPbf1XdhXhWcSQMH41dYhr6w1KEnSmomn5Z 4iJc0G0Gh3UGK8x0DC4UbAu1qAlQ5+Lu8XVPtYOlMCA3xQQD4imp8nomlThEHlMfGuFIYV MEmLxVn3HE9ivqac4M0upxTUxxiXkxo= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=L48H43W4; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf06.hostedemail.com: domain of qi.zheng@linux.dev designates 91.218.175.180 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1763118847; 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=nUnrWplutHBzvgR2dvaxPt91n3EUIlT8RN+kjzr9YeU=; b=A0680NvKAAB7+fm49Q6S1uX9dgVDvms6Pe06GQPQ0KI38XT0nTsbdklYyn0xRIFw/U/cc6 33kZ7OJh7SVqU7UYJlN3YOqC28hbLfiw+YJJtVUB8CuW0gHGjMw8fwaOlCynzreqFvzgh2 5TKAkCzrm0y217R4jG+3kSZ2Ne/2nBw= 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=1763118845; 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=L48H43W4jFZRnZVw9O79JRiRB5m9aw/GV0MPdZjIrgDSOzS1xJajXCccgoMGVVyjHQVMx8 ixGDGcGZ9+fwVuXGogoz7wJwNfE66muSzsaVj6jY+ONOTTSdEs5AZWkbAoLKzZN3TJkNEr SLREeZzO+x0CEbQrd41ME+/n9u8TpH4= 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@redhat.com, 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 , Richard Weinberger , Anton Ivanov , Johannes Berg Subject: [PATCH 6/7] um: mm: enable MMU_GATHER_RCU_TABLE_FREE Date: Fri, 14 Nov 2025 19:11:20 +0800 Message-ID: <27f173b0fc6fdf92104721fc3daba8d7d9d31e2f.1763117269.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: rspam06 X-Rspamd-Queue-Id: E674718000C X-Stat-Signature: 5wezx7din4wqa17b9k8n7jhoq5ihiq48 X-Rspam-User: X-HE-Tag: 1763118846-720973 X-HE-Meta: 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 dQ0l0zPQ ecLpuDRN8G6CYJU3JxR+CYWMu7sDOFlajbMvGiawBoZMUc2qN5yzSPGxju95OKTdrqSs9bi2AyB8N/TPj7LVk2LFuUS1R2Be3A9qAdm2zsuN/UwYTAX1HJxfFw+yvSdutwFKbvrwU83hgBu8pwFxy0PcK3xX92/7jRIUNADD/EtoyO2B142rQ4BxjcWzxsml8RBpVAOFaFSEUKgzq1DoweDTnmbZvy2NIZbN9fRc/QNzcddNNY4OSJbMiKlxdXan8R1dLuZ0ZohTQX88/okY9q55hncmfZ1Xtv5oKqvQGNCqdUxBNeq0uhIF9EK3rxEZhoVqEw6lIZIt4YaHv74oai1m1RHrsJ9wzkrNn 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