From nobody Mon Feb 9 20:36:49 2026 Received: from out-189.mta1.migadu.com (out-189.mta1.migadu.com [95.215.58.189]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 388BF312807 for ; Tue, 27 Jan 2026 12:17:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.189 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769516228; cv=none; b=ijdudwlq+s6ZVEImjCE2UaPI3+B6QpE//psEe7feAJZqrxk+jhlOz6mCiyj3klbGredX2U24dwEWDVFOaDAKwFVqTKOZEVlOK1vz47u0a+2MSpQFA61XYfeDUJdgMBl8P0RTEVVosfFqajYx2T23Jm4blZjg2HcUYY9jeIJfxUc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769516228; c=relaxed/simple; bh=VLhAYRab+uCXbMXmi0FAQowbk8oZ+0XrtFLxtQv6uEM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ic0HR6fL2cLkrZnnJy79Sxvo/w7z7kBzMBa941M/aHdoMPi5p217zMlqML1d1DdVymPVu0e7enKGpGTiSqrK0DZ+CjgDhUREWN/YaRawHjsn/n9kF+BixDUrX7ELCQycCf+CUAycctk1SqBeBn9kiWdDW7HQA1eH3cktmoHOr7c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=PPUTXLwM; arc=none smtp.client-ip=95.215.58.189 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="PPUTXLwM" 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=1769516225; 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=9S/xSrdX3PQNdvGeiuAn8WfyMx/Wvh3tfYwOBKYci1k=; b=PPUTXLwMU1duEHyeudBnwMgqeL0QFNpFSjT+IpgiJrSgmVNwexEAjm3B23aqu5g9VcrKTg Aaw90cmNk5t7rMZujqg3RHg4NK585jt1GbWmBoHuCc2OwJwlcNbfr9XVJ72IPkS44CiySj 6Y7MLvU/JazKo2G7NgIk8Lrczju32XY= 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 Subject: [PATCH v4 8/8] mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE Date: Tue, 27 Jan 2026 20:13:01 +0800 Message-ID: <83b034810935a9ff18e425b085e065bb0acb28f3.1769515122.git.zhengqi.arch@bytedance.com> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" From: Qi Zheng The PT_RECLAIM can work on all architectures that support MMU_GATHER_RCU_TABLE_FREE, except for those that have selected HAVE_ARCH_TLB_REMOVE_TABLE,so make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE && !HAVE_ARCH_TLB_REMOVE_TABLE. BTW, change PT_RECLAIM to be enabled by default, since nobody should want to turn it off. Signed-off-by: Qi Zheng Acked-by: David Hildenbrand (Red Hat) --- arch/x86/Kconfig | 1 - mm/Kconfig | 9 ++------- 2 files changed, 2 insertions(+), 8 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 80527299f859a..0d22da56a71b0 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -331,7 +331,6 @@ config X86 select FUNCTION_ALIGNMENT_4B imply IMA_SECURE_AND_OR_TRUSTED_BOOT if EFI select HAVE_DYNAMIC_FTRACE_NO_PATCHABLE - select ARCH_SUPPORTS_PT_RECLAIM if X86_64 select ARCH_SUPPORTS_SCHED_SMT if SMP select SCHED_SMT if SMP select ARCH_SUPPORTS_SCHED_CLUSTER if SMP diff --git a/mm/Kconfig b/mm/Kconfig index 456e9eaedca39..1f3109b164d86 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1454,14 +1454,9 @@ config ARCH_HAS_USER_SHADOW_STACK config HAVE_ARCH_TLB_REMOVE_TABLE def_bool n =20 -config ARCH_SUPPORTS_PT_RECLAIM - def_bool n - config PT_RECLAIM - bool "reclaim empty user page table pages" - default y - depends on ARCH_SUPPORTS_PT_RECLAIM && MMU && SMP - select MMU_GATHER_RCU_TABLE_FREE + def_bool y + depends on MMU_GATHER_RCU_TABLE_FREE && !HAVE_ARCH_TLB_REMOVE_TABLE help Try to reclaim empty user page table pages in paths other than munmap and exit_mmap path. --=20 2.20.1