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 9CDE3D2F005 for ; Tue, 27 Jan 2026 12:16:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E65D66B008C; Tue, 27 Jan 2026 07:16:31 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E26A46B0092; Tue, 27 Jan 2026 07:16:31 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D5D796B0093; Tue, 27 Jan 2026 07:16:31 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id C795C6B008C for ; Tue, 27 Jan 2026 07:16:31 -0500 (EST) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 87412BD4D7 for ; Tue, 27 Jan 2026 12:16:31 +0000 (UTC) X-FDA: 84377641782.26.82533AF Received: from out-188.mta1.migadu.com (out-188.mta1.migadu.com [95.215.58.188]) by imf17.hostedemail.com (Postfix) with ESMTP id 9ADDD40005 for ; Tue, 27 Jan 2026 12:16:29 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=xO2ohnEJ; spf=pass (imf17.hostedemail.com: domain of qi.zheng@linux.dev designates 95.215.58.188 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=1769516189; 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=WjvVUE6PLFuQKn8iudCm/UQAhzXxbds5MAnD30p0biw=; b=41JnXlCBc7mnGgu5/CwmZOzJ79fXSxRadFLfz0k/Q2hccr49CLdLdU2/MSBmz27b9Pj44V Zx6VVik4jXH4bQ5wDDKy62TlnLkPImkcK3geAGVpjlWV0EywK7HeUWgGiNkFbdjnvuxVL5 6sKVlbsTCtyWsHNGo9x0lLlWE14/JPg= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=xO2ohnEJ; spf=pass (imf17.hostedemail.com: domain of qi.zheng@linux.dev designates 95.215.58.188 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=1769516189; a=rsa-sha256; cv=none; b=glogQoRYECLYevY6Bk4/CqnGfvUzfeqtbG/NnkOGgbHvqZ3aewFb/kYhP8NZhBNWjbdjpx m59308OpQo9gze2H0uDV2FEb0JbO2Q+oBn9VzGjFF3XwShX3HgiytOOX2veZnoGQkDAR7g KRVaaFna2Vt2ba1OqN/EffRuUBGeijo= 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=1769516188; 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=WjvVUE6PLFuQKn8iudCm/UQAhzXxbds5MAnD30p0biw=; b=xO2ohnEJgOKRyNkG4Cwbt6Lp5Pd3P0WQhApWwjUgIK9wbWMLtrc5Kj+Sv2UwYxk+CDb3Ad KWmqiGgfLYLHLuqZQ8nKUidTKDgFbIO+JI75wDJ6MO926YTSF3yH8RoAp0rLN3hGVlvVlD FKkbFSoSRhVTR41853D/W5ny0Ls+MK4= 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 , Huacai Chen , WANG Xuerui Subject: [PATCH v4 3/8] LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREE Date: Tue, 27 Jan 2026 20:12:56 +0800 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 9ADDD40005 X-Stat-Signature: 83r5t4w6qjcicwnk3ujto6jc3p4fkwu4 X-Rspam-User: X-HE-Tag: 1769516189-53643 X-HE-Meta: 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 sJvCcFG2 naqQweLT85whTLnBevjgbFajCQGgwd0/kdrk/M/jmrGOwYautqinkonCZzBZL65rUpqIenwQgq+UR+PSb4M1vG7t0X06UXyZxvO6NtKc9asmT7HXtFUmzcTruiNKBhu9ktCQ/02k3KuDQ1Af8xT0/O4AzWLhumHNL5/F7OCnkB2YrMi7MpO4HzsMsrHHvoB/SvfgDyaX3WGQfEInCzyDhM2xXGq5MTdtEsgKUdP6OERY+j2u3Z4Xt43phr2FV/Hhk3nbPe5j5cDwpIgNmu4bh4nXwre+FvAR+b25AD9j0TW49ECjwewVNJKFvftTQC28YTF4l 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: Huacai Chen Cc: WANG Xuerui --- arch/loongarch/Kconfig | 1 + arch/loongarch/include/asm/pgalloc.h | 7 +++---- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 730f342145197..43d5b863e1fb2 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -187,6 +187,7 @@ config LOONGARCH select IRQ_LOONGARCH_CPU select LOCK_MM_AND_FIND_VMA select MMU_GATHER_MERGE_VMAS if MMU + select MMU_GATHER_RCU_TABLE_FREE select MODULES_USE_ELF_RELA if MODULES select NEED_PER_CPU_EMBED_FIRST_CHUNK select NEED_PER_CPU_PAGE_FIRST_CHUNK diff --git a/arch/loongarch/include/asm/pgalloc.h b/arch/loongarch/include/asm/pgalloc.h index 08dcc698ec184..248f62d0b590e 100644 --- a/arch/loongarch/include/asm/pgalloc.h +++ b/arch/loongarch/include/asm/pgalloc.h @@ -55,8 +55,7 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) return pte; } -#define __pte_free_tlb(tlb, pte, address) \ - tlb_remove_ptdesc((tlb), page_ptdesc(pte)) +#define __pte_free_tlb(tlb, pte, address) tlb_remove_ptdesc((tlb), page_ptdesc(pte)) #ifndef __PAGETABLE_PMD_FOLDED @@ -79,7 +78,7 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) return pmd; } -#define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x) +#define __pmd_free_tlb(tlb, x, addr) tlb_remove_ptdesc((tlb), virt_to_ptdesc(x)) #endif @@ -99,7 +98,7 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) return pud; } -#define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x) +#define __pud_free_tlb(tlb, x, addr) tlb_remove_ptdesc((tlb), virt_to_ptdesc(x)) #endif /* __PAGETABLE_PUD_FOLDED */ -- 2.20.1