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Sat, 07 Mar 2020 01:08:24 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02716utR147358; Sat, 7 Mar 2020 01:08:24 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 2ym0quu3wk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 07 Mar 2020 01:08:24 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 027184eq023779; Sat, 7 Mar 2020 01:08:04 GMT Received: from [10.11.0.40] (/10.11.0.40) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 06 Mar 2020 17:08:04 -0800 Subject: Re: [PATCH] vfs: keep inodes with page cache off the inode shrinker LRU To: Nishanth Menon Cc: Arnd Bergmann , Tero Kristo , Linux ARM , Michal Hocko , Rik van Riel , Catalin Marinas , Santosh Shilimkar , Dave Chinner , Russell King - ARM Linux admin , Linux Kernel Mailing List , Linux-MM , Yafang Shao , Al Viro , Johannes Weiner , linux-fsdevel , kernel-team@fb.com, Kishon Vijay Abraham I , Linus Torvalds , Andrew Morton , Roman Gushchin References: <20200211193101.GA178975@cmpxchg.org> <20200211154438.14ef129db412574c5576facf@linux-foundation.org> <20200211164701.4ac88d9222e23d1e8cc57c51@linux-foundation.org> <20200212085004.GL25745@shell.armlinux.org.uk> <671b05bc-7237-7422-3ece-f1a4a3652c92@oracle.com> <7c4c1459-60d5-24c8-6eb9-da299ead99ea@oracle.com> <20200306203439.peytghdqragjfhdx@kahuna> From: santosh.shilimkar@oracle.com Organization: Oracle Corporation Message-ID: <7b179d51-3d08-53f5-9b6e-552869f8ed78@oracle.com> Date: Fri, 6 Mar 2020 17:08:03 -0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20200306203439.peytghdqragjfhdx@kahuna> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9552 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 spamscore=0 suspectscore=0 mlxscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003070004 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9552 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 phishscore=0 spamscore=0 impostorscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 lowpriorityscore=0 priorityscore=1501 bulkscore=0 clxscore=1011 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003070003 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 3/6/20 12:34 PM, Nishanth Menon wrote: > On 13:11-20200226, santosh.shilimkar@oracle.com wrote: >> +Nishant, Tero >> >> On 2/26/20 1:01 PM, Arnd Bergmann wrote: >>> On Wed, Feb 26, 2020 at 7:04 PM wrote: >>>> >>>> On 2/13/20 8:52 AM, Arnd Bergmann wrote: >>>>> On Wed, Feb 12, 2020 at 9:50 AM Russell King - ARM Linux admin >>>>> wrote: >>>> >>>> The Keystone generations of SOCs have been used in different areas and >>>> they will be used for long unless says otherwise. >>>> >>>> Apart from just split of lowmem and highmem, one of the peculiar thing >>>> with Keystome family of SOCs is the DDR is addressable from two >>>> addressing ranges. The lowmem address range is actually non-cached >>>> range and the higher range is the cacheable. >>> >>> I'm aware of Keystone's special physical memory layout, but for the >>> discussion here, this is actually irrelevant for the discussion about >>> highmem here, which is only about the way we map all or part of the >>> available physical memory into the 4GB of virtual address space. >>> >>> The far more important question is how much memory any users >>> (in particular the subset that are going to update their kernels >>> several years from now) actually have installed. Keystone-II is >>> one of the rare 32-bit chips with fairly wide memory interfaces, >>> having two 72-bit (with ECC) channels rather than the usual one >>> or two channels of 32-bit DDR3. This means a relatively cheap >>> 4GB configuration using eight 256Mx16 chips is possible, or >>> even a 8GB using sixteen or eighteen 512Mx8. >>> >>> Do you have an estimate on how common these 4GB and 8GB >>> configurations are in practice outside of the TI evaluation >>> board? >>> >> From my TI memories, many K2 customers were going to install >> more than 2G memory. Don't remember 8G, but 4G was the dominant >> one afair. Will let Nishant/Tero elaborate latest on this. >> > > Thanks for the headsup, it took a little to dig up the current > situation: > > ~few 1000s still relevant spread between 4G and 8G (confirmed that both > are present, relevant and in use). > > I wish we could sunset, but unfortunately, I am told(and agree) > that we should'nt just leave products (and these are long term > products stuck in critical parts in our world) hanging in the air, and > migrations to newer kernel do still take place periodically (the best > I can talk in public forum at least). > Thanks Nishant !!