From patchwork Wed Apr 16 04:25:49 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 14053152 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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21036C369BD for ; Wed, 16 Apr 2025 04:26:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4256B6B0256; Wed, 16 Apr 2025 00:26:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3AFAB28000E; Wed, 16 Apr 2025 00:26:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 24EC86B025A; Wed, 16 Apr 2025 00:26:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 010106B0256 for ; Wed, 16 Apr 2025 00:26:05 -0400 (EDT) Received: from smtpin21.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 8E9EFBC4E4 for ; Wed, 16 Apr 2025 04:26:07 +0000 (UTC) X-FDA: 83338619574.21.FEB0554 Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf26.hostedemail.com (Postfix) with ESMTP id 02D2E14000B for ; Wed, 16 Apr 2025 04:26:05 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=dSsJWtUD; spf=pass (imf26.hostedemail.com: domain of sj@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=sj@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1744777566; 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=mVjEgSjSQp4rtCIc5dd/5AyB5TpVfMT5GgYDUWc3HMk=; b=VoIQH//GtDw183txooD84bAZ0I4A3w7z+6Mk0RCnHbwGohC2EmN5DfkcDUvfVoO/iY+cqf AGa9ZY2fqMdMcbr3CjRj0mxQvbZF8bI4DeIlPLwWPL+CAqeiwXHcZuXkDnZMwPY109GM66 s2SzFWOqVTHTmo7JWRecuQrTIDip3hI= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=dSsJWtUD; spf=pass (imf26.hostedemail.com: domain of sj@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=sj@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1744777566; a=rsa-sha256; cv=none; b=VliHVqo1jm+VWBeQ2zLPj/tCmwMlc7LZtzVmMGTETbhOpx3EgEG4ZgQwBy+TrCU9A1zSqQ R8vYZ+O6pOkzGLPkSepKa3Mm5jKGUjJXcEGHFbA7xzlK3RnjE1Gm0hE6mdZBKhTJFc5kR8 b+uZINTWsxVDtL7Rfc8Hy+OayYFFJ/8= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 082DCA4A876; Wed, 16 Apr 2025 04:20:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 05D89C4CEEA; Wed, 16 Apr 2025 04:26:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744777565; bh=C+T3wfxfhPRxkNioz56rR7c+eSN/gWhnmvnMwAnCIno=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dSsJWtUDU8hRRLhlhNl/VtJJcqzet4cq04mR3B4LCNcLGuXA5T/uhQq1d9V6d8fcn 6LPz3S9lTGld1i8HCiWnVxNdvJ2w/KqX0TFtBkzHH50tzm4AycnWrOxxRSRErvW2IM qAdMjO4q3g2bbHJvBIlXesRh/ldykDY7DXAtk/UB6Me5lZK4tGKxssNZOU/+34JzCS EKAhnq5Z7JHXguSjOz0C/83vvh2yh3x0PhrFd4beIF9ryD892ufu5HgEowX0iDSyZZ LBqmK1jsSkSmJ69pu+V/5Bh0CGT8wpUzDBafJnq7A/0haRIqOo9gJIEqcWfLxte+u0 7T5uvuyhKJTjQ== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , Jonathan Corbet , Ze Zuo , damon@lists.linux.dev, kernel-team@meta.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 08/10] Docs/mm/damon/design: document 'address unit' parameter Date: Tue, 15 Apr 2025 21:25:49 -0700 Message-Id: <20250416042551.158131-9-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250416042551.158131-1-sj@kernel.org> References: <20250416042551.158131-1-sj@kernel.org> MIME-Version: 1.0 X-Stat-Signature: adz753ew657mb7ik8jfm9ibbdnxxzwe9 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 02D2E14000B X-Rspam-User: X-HE-Tag: 1744777565-78835 X-HE-Meta: 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 QN6lPR/B qbbfrVAWL8deOf9uLwjQDoddSunoFJEvwxLbppXLPiHvQIqxo33aPgFJbPg8WdHhjPQEaLzjQH2PfPgxr5nXQMd0/ILk/lsRnpsrIKM3tvIcxXIH6YIuP7R6OKmYjCM4IbrsI1fWsjZ/FG7yHlIgwxVSHkQi/rcqdjqHq+6Rym+uw7liGSWE+L9d59tpTlnYFrWBmGfm4sAvRucthhWXxT9eRsUQraVLl7DINnOGAyWJaq1g= 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: Add 'addr_unit' parameter description on DAMON design document. Signed-off-by: SeongJae Park --- Documentation/mm/damon/design.rst | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index aa01d0232adc..696a4d738cb3 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -69,7 +69,7 @@ processes, NUMA nodes, files, and backing memory devices would be supportable. Also, if some architectures or devices support special optimized access check features, those will be easily configurable. -DAMON currently provides below three operation sets. Below two subsections +DAMON currently provides below three operation sets. Below three subsections describe how those work. - vaddr: Monitor virtual address spaces of specific processes @@ -137,6 +137,18 @@ the interference is the responsibility of sysadmins. However, it solves the conflict with the reclaim logic using ``PG_idle`` and ``PG_young`` page flags, as Idle page tracking does. +Address Unit +------------ + +DAMON core layer uses ``unsinged long`` type for monitoring target address +ranges. In some cases, the address space for a given operations set could be +too large to be handled with the type. ARM (32-bit) with large physical +address extension is an example. For such cases, a per-operations set +parameter called ``address unit`` is provided. It represents the scale factor +that need to be multiplied to the core layer's address for calculating real +address on the given address space. Support of ``address unit`` parameter is +up to each operations set implementation. ``paddr`` is the only operations set +implementation that supports the parameter. .. _damon_core_logic: