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Mon, 20 Feb 2023 04:55:20 GMT Received: from smtpav02.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B96DF5805B; Mon, 20 Feb 2023 04:55:19 +0000 (GMT) Received: from smtpav02.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B65CE58058; Mon, 20 Feb 2023 04:55:15 +0000 (GMT) Received: from skywalker.linux.ibm.com (unknown [9.109.205.160]) by smtpav02.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 20 Feb 2023 04:55:15 +0000 (GMT) X-Mailer: emacs 29.0.60 (via feedmail 11-beta-1 I) From: "Aneesh Kumar K.V" To: Yang Shi , David Rientjes Cc: "Viacheslav A.Dubeyko" , lsf-pc@lists.linux-foundation.org, linux-cxl@vger.kernel.org, linux-mm@kvack.org, Dan Williams , Jonathan Cameron , Adam Manzanares , Duen-wen Hsiao , Johannes Weiner Subject: Re: [LSF/MM/BPF BoF] Session for CXL memory In-Reply-To: References: <38D49DA9-3C57-4951-8CBA-5D2BB0C40D9C@bytedance.com> Date: Mon, 20 Feb 2023 10:25:12 +0530 Message-ID: <87v8jx0wcv.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Gdq6GZnXqO7X3Ab7u1m4fmPu_t52Eu-C X-Proofpoint-ORIG-GUID: vWinnm_MLpH5UWHtG0_eKaS55ObBeYh4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.170.22 definitions=2023-02-20_01,2023-02-17_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 bulkscore=0 mlxscore=0 phishscore=0 impostorscore=0 suspectscore=0 adultscore=0 malwarescore=0 clxscore=1011 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302200041 X-Rspamd-Queue-Id: 509B91A0007 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: uscm4osqtx5sjfoy5wcrrzz9nk33t84q X-HE-Tag: 1676868949-926524 X-HE-Meta: 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 XAyENPFq pEpgbKbeUNGuKmsXsxOFwityktx+K/DW2M+9dVf82NuwysqIHjFSX3o4+gkaVcv5b47aimEM74WgWGeF6FkSe6J4C4VfRFkqVJik8RK2H1KR+5dDTUO8ERQteEfCIrZ73QtCOOFHjbvsh5UcCsFL7QQ/YFXQV5arXeqinS/5xUthnPnfNx8mKZFYhukALtAHOB3MRGs7eMI5/VjKxliQ4K7u6sA== 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: Yang Shi writes: > On Sun, Jan 22, 2023 at 9:51 PM David Rientjes wrote: >> >> On Fri, 6 Jan 2023, Viacheslav A.Dubeyko wrote: >> >> > CC: LSF/MM/BPF mailing list. Sorry, missed the list. >> > >> > > On Jan 6, 2023, at 11:51 AM, Viacheslav A.Dubeyko wrote: >> > > >> > > Hello, >> > > >> > > I believe CXL memory is hot topic now. I believe we have multiple topics >> > > for discussion. I personally would like to discuss CXL Fabric Manager >> > > and vision of FM architecture implementation. I am going to share the topic >> > > in separate email. I would like to suggest a special session for CXL memory >> > > related topics. >> > > >> > > How everybody feels about it? >> > > >> >> I think this makes a lot of sense, thanks for suggesting it. >> >> Should this be a BoF or just a normal topic proposal? I assume that there >> could be several different topics of interest all related to CXL.mem. >> >> Specifically interesting would be the division of work between the kernel >> and userspace to manage memory placement on systems with locally attached >> CXL. And, further, what APIs userspace would have at its disposal for >> explicit optimization of this placement that would exist beyond what is >> available for NUMA. > > Yeah, in addition, how CXL hierarchy interacts with memory tiering may > be an interesting topic too. > >> >> I assume we might also want to chat about CXL 2.0 extensions that would be >> useful, especially for cloud providers. >> >> I'd be happy to join in any of the proposals for these topics, just let me >> know! > > +1 for me. > I would also be interested in finding out what we learned about the device attributes that people want to use for building hierarchy. We still haven't hooked up HMAT/CDAT to memory tiers. It would be good to understand and discuss on how we should make progress here. -aneesh