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[192.55.52.43]) by mx.google.com with ESMTPS id u137si6450829pfc.133.2019.02.06.08.26.25 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Feb 2019 08:26:25 -0800 (PST) Received-SPF: pass (google.com: domain of keith.busch@intel.com designates 192.55.52.43 as permitted sender) client-ip=192.55.52.43; Authentication-Results: mx.google.com; spf=pass (google.com: domain of keith.busch@intel.com designates 192.55.52.43 as permitted sender) smtp.mailfrom=keith.busch@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Feb 2019 08:26:25 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,340,1544515200"; d="scan'208";a="132038943" Received: from unknown (HELO localhost.localdomain) ([10.232.112.69]) by orsmga002.jf.intel.com with ESMTP; 06 Feb 2019 08:26:24 -0800 Date: Wed, 6 Feb 2019 09:25:53 -0700 From: Keith Busch To: Jonathan Cameron Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-mm@kvack.org, Greg Kroah-Hartman , Rafael Wysocki , Dave Hansen , Dan Williams , linuxarm@huawei.com Subject: Re: [PATCHv5 10/10] doc/mm: New documentation for memory performance Message-ID: <20190206162553.GI28064@localhost.localdomain> References: <20190124230724.10022-1-keith.busch@intel.com> <20190124230724.10022-11-keith.busch@intel.com> <20190206104552.00003bad@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190206104552.00003bad@huawei.com> User-Agent: Mutt/1.9.1 (2017-09-22) 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: On Wed, Feb 06, 2019 at 10:45:52AM +0000, Jonathan Cameron wrote: > On Thu, 24 Jan 2019 16:07:24 -0700 > Keith Busch wrote: > > + # tree -P "read*|write*" /sys/devices/system/node/nodeY/access0/ > > + /sys/devices/system/node/nodeY/access0/ > > + |-- read_bandwidth > > + |-- read_latency > > + |-- write_bandwidth > > + `-- write_latency > > These seem to be under > /sys/devices/system/node/nodeY/access0/initiators/ > (so one directory deeper). You're right, I used data from the previous series to generate that. > > + # tree sys/devices/system/node/node0/side_cache/ > > + /sys/devices/system/node/node0/side_cache/ > > + |-- index1 > > + | |-- associativity > > + | |-- level > > What is the purpose of having level in here? Isn't it the same as the A..C > in the index naming? Yes, it is redundant with the name. I will remove it. > > + | |-- line_size > > + | |-- size > > + | `-- write_policy > > + > > +The "associativity" will be 0 if it is a direct-mapped cache, and non-zero > > +for any other indexed based, multi-way associativity. > > Is it worth providing the ACPI mapping in this doc? We have None, Direct and > 'complex'. Fun question of what None means? Not specified? Yeah, my take on "none" was that it's unreported and we don't know what is actually happening.. > > + > > +The "level" is the distance from the far memory, and matches the number > > +appended to its "index" directory. > > + > > +The "line_size" is the number of bytes accessed on a cache miss. > > Maybe "number of bytes accessed from next cache level" ? Sounds good.