From nobody Mon Feb 9 23:58:13 2026 Received: from mail-pf1-f179.google.com (mail-pf1-f179.google.com [209.85.210.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 11B4D15B995 for ; Mon, 5 Aug 2024 12:55:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722862557; cv=none; b=eaItMMCauW/PJbTHWn1Dp5PggeMvXWIco1geLDVK0ZSYPWQTBXp/vr5TClPxxucC8hGZ8O86hN9lPxMByyLgYCwCcu+rFdlajiF3June0IFjImstb3cX82XreVmfpjeJeVxy9uKXlh0+pzEu8SYQSyRY2nuDAiaWv5TmvfkXDNE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722862557; c=relaxed/simple; bh=2Xqu+2y/kqGayw1LhiCWd/D/5aR4Vut5ubymQlHw490=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=t2qCh+P9ZiFfQjYPVAdQj5A8tmCv/tvZ879POu8eeObGwuIchNrvZH2FULmPgYKDq6geiiPB8lBd0po5JScTxP62BdwS+Fla7WedXpmSV/ehGE1Cg07fHq0JXqTANhkINyfGLCZrmj4mYwJupwXyX54s11/JSzqLiUFHRk2diSk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=bytedance.com; spf=pass smtp.mailfrom=bytedance.com; dkim=pass (2048-bit key) header.d=bytedance.com header.i=@bytedance.com header.b=g8nZY27O; arc=none smtp.client-ip=209.85.210.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=bytedance.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bytedance.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bytedance.com header.i=@bytedance.com header.b="g8nZY27O" Received: by mail-pf1-f179.google.com with SMTP id d2e1a72fcca58-70d2cd07869so1261176b3a.0 for ; Mon, 05 Aug 2024 05:55:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1722862555; x=1723467355; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=omYHK4YJqVuB4cm7/RSntivvxRLai4c0fyHEJvres6w=; b=g8nZY27OWg96d/TGmk6lu2DKe7pgZeFhWNASkM3SztHrkajrK38SbMLONG21i6+mKz fOIYVXmp6jInFt9MgcNwYFYLZOEOWANCi+IekcEZlJVeeEIG2cHL3ZmK92NGHrpWlQlC WFhORBMz6xds1LL7DeaK4Q4quK1KhjgaQ/1G2Sbs2hwxRMlDzDHr+MJlRbGUx0HKh0tz rHcv6Z6t/H2RkTp61BNiG3C0gVVnD+dGZ8kdj7sBiSJdt8cy1/f/jB1Xga8rOZ1IFEXw 9IMuLN1rhRmZyZIk8ZrLZmT0RD1whdwbihsKUHePA1rRiUxgGTDYCNpm4zbbJwxdUk4b epGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722862555; x=1723467355; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=omYHK4YJqVuB4cm7/RSntivvxRLai4c0fyHEJvres6w=; b=ARt4DHbWRa8JofCURcZO3KzdwJz9X1/MnGTpclWwwVRGsChIqW4d/Fx3Nm5wYv9+IU kOmUwx3kIDIQSiWbeH034SOwDTaIuj564iYSOAL6Zy1i2Z0f1lWYpML1Nxpp8gPp6JjW mOMsvbe69ACKpnEM0bcPgXa5L83i17xR3XqR6NhZGrz1sXmI40bMxkuL6Y04M5xtXxml TWQvqYc0qbF1y+yhtMSxp0k0E0+A5Grxnq8v39j/mKxZYvcLoQ+6Y4WRwsBtNkeoKvdK AZhz2F10GePECZmFDlMqE8p0BdpnKDvFl6k646QxHSi2OzBpV5wGMLXQOdn/+UroCOWr Y8wg== X-Forwarded-Encrypted: i=1; AJvYcCX+/6+/0OvyMYGseMKldCPYQr9VakyQCr68iY4cZQw+i/07BsFPN6fCTpdyxYk330FfAUyQaWRvJugiOC4=@vger.kernel.org X-Gm-Message-State: AOJu0YwqzAsaqcgHf1PIGQLYIym1KMPEU5UBOwuH5QqyPVPKDN8YAwyD j8il/hUCVcm8m3Bvz70KTvmvpl2MRxZKUTwaNqt90I6D2WjyYIngoBj5vN5YOts= X-Google-Smtp-Source: AGHT+IGYYukG+ok6MYSzTAxan5mNsM3B2kkWkuJBYY1IjywvHeK1bY7aqXgLyTgGlf83PVoHS2ooMA== X-Received: by 2002:a05:6a00:21ce:b0:70d:2c09:45ff with SMTP id d2e1a72fcca58-7106d0927eemr9121873b3a.4.1722862555191; Mon, 05 Aug 2024 05:55:55 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.232]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7106ecfaf1asm5503030b3a.142.2024.08.05.05.55.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Aug 2024 05:55:54 -0700 (PDT) From: Qi Zheng To: david@redhat.com, hughd@google.com, willy@infradead.org, mgorman@suse.de, muchun.song@linux.dev, vbabka@kernel.org, akpm@linux-foundation.org, zokeefe@google.com, rientjes@google.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Qi Zheng Subject: [RFC PATCH v2 2/7] mm: introduce CONFIG_PT_RECLAIM Date: Mon, 5 Aug 2024 20:55:06 +0800 Message-Id: <7c726839e2610f1873d9fa2a7c60715796579d1a.1722861064.git.zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) 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 Content-Type: text/plain; charset="utf-8" This configuration variable will be used to build the code needed to free empty user page table pages. This feature is not available on all architectures yet, so ARCH_SUPPORTS_PT_RECLAIM is needed. We can remove it once all architectures support this feature. Signed-off-by: Qi Zheng --- mm/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/mm/Kconfig b/mm/Kconfig index 3936fe4d26d91..c10741c54dcb1 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1278,6 +1278,20 @@ config NUMA_EMU into virtual nodes when booted with "numa=3Dfake=3DN", where N is the number of nodes. This is only useful for debugging. =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 + help + Try to reclaim empty user page table pages in paths other that munmap + and exit_mmap path. + + Note: now only empty user PTE page table pages will be reclaimed. + source "mm/damon/Kconfig" =20 endmenu --=20 2.20.1