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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B98ECCAC597 for ; Tue, 9 Sep 2025 17:14:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=xIfu0j97IyRXPCOtWvYmSqItFYmGHK25glR1j9+hfWs=; b=uC4Xy65U4yCSSoVo5aBYtm6RC2 10Tey9RlklOY8X48LLi4HYDTAr0waAD9b+BJ/FS5T+/QLRNQt4mZ7uPZw0FxPnnX838m7QP9WqnDC KHv1tgT/fCMAonL7LvZZ8LoJQqDBtch2lqFrGqz1S/f4Tx+XAIcgA5b5UsPYF+NIPk8zL/Wl1c5c/ 5zor1ZBBAD0fAlLpNJjbuRAeXfd7mBjN3jQe+G4UZ52pzJFreTKEQZZx2exaQOhgAZ2ccY+ULww14 BgqtGNC4kkgrlLroE/abkU7p+k7Ad6UO5zAgNCAcNx40+T5DLOY4T8d7NgqsXVP3q+ORcnRplGaw7 eBdiwBLw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uw1v4-00000008mYT-3kB1; Tue, 09 Sep 2025 17:14:14 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uvvYE-00000006NmD-33sZ for linux-arm-kernel@lists.infradead.org; Tue, 09 Sep 2025 10:26:16 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B85C3113E; Tue, 9 Sep 2025 03:26:05 -0700 (PDT) Received: from e133380.arm.com (e133380.arm.com [10.1.197.68]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3CDB83F66E; Tue, 9 Sep 2025 03:26:08 -0700 (PDT) Date: Tue, 9 Sep 2025 11:26:05 +0100 From: Dave Martin To: James Morse Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, shameerali.kolothum.thodi@huawei.com, D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Rex Nie , Koba Ko , Shanker Donthineni , fenghuay@nvidia.com, baisheng.gao@unisoc.com, Jonathan Cameron , Rob Herring , Rohit Mathew , Rafael Wysocki , Len Brown , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich Subject: Re: [PATCH 07/33] arm64: kconfig: Add Kconfig entry for MPAM Message-ID: References: <20250822153048.2287-1-james.morse@arm.com> <20250822153048.2287-8-james.morse@arm.com> <978cf822-4d7c-4301-bbc4-752f184c93d6@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <978cf822-4d7c-4301-bbc4-752f184c93d6@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250909_032614_842569_C10811FD X-CRM114-Status: GOOD ( 25.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On Thu, Sep 04, 2025 at 06:28:14PM +0100, James Morse wrote: > Hi Dave, > > On 27/08/2025 12:01, Dave Martin wrote: > > > > Uh oh! > > > (Since this likely be people's go-to patch for understanding what MPAM > > is, it is probably worth going the extra mile.) > > > > On Fri, Aug 22, 2025 at 03:29:48PM +0000, James Morse wrote: > >> The bulk of the MPAM driver lives outside the arch code because it > >> largely manages MMIO devices that generate interrupts. The driver > >> needs a Kconfig symbol to enable it, as MPAM is only found on arm64 > > > > Prefer -> "[...] to enable it. As MPAM is only [...]" > > > >> platforms, that is where the Kconfig option makes the most sense. > > > > It could be clearer what "where" refers to, here. > > Sure, > > > > Maybe reword from ", that is [...]" -> ", the arm64 tree is the most > > natural home for the Kconfig option." > > > > (Or something like that.) > > Sure, [... etc., etc. ...] > >> + partition-id and performance-monitoring-group to measure the > >> + cache occupancy or data throughput. > > > > So, how about something like: > > > > --8<-- > > > > Memory system components, such as the caches, can be configured with > > policies to control how much of various physical resources (such as > > memory bandwidth or cache memory) the transactions labelled with each > > PARTID can consume. Depending on the capabilities of the hardware, > > the PARTID and PMG can also be used as filtering criteria to measure > > the memory system resource consumption of different parts of a > > workload. > > > > -->8-- > > Done, > > > > (Where "Memory system components" is used in a generic sense and so not > > capitalised.) > > (I can't wait for the Memory System Component on the Memory Side Cache!) Urk. MSCē ? [...] Cheers ---Dave