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Wed, 25 May 2022 10:01:14 +0000 (GMT) Received: from [9.43.37.143] (unknown [9.43.37.143]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 25 May 2022 10:01:14 +0000 (GMT) Message-ID: <594046f8-9ab3-786a-fc48-8a61f1238f52@linux.ibm.com> Date: Wed, 25 May 2022 15:31:13 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: Re: RFC: Memory Tiering Kernel Interfaces (v2) Content-Language: en-US To: Ying Huang , Wei Xu Cc: Jonathan Cameron , Andrew Morton , Greg Thelen , Yang Shi , Linux Kernel Mailing List , Jagdish Gediya , Michal Hocko , Tim C Chen , Dave Hansen , Alistair Popple , Baolin Wang , Feng Tang , Davidlohr Bueso , Dan Williams , David Rientjes , Linux MM , Brice Goglin , Hesham Almatary References: <20220512160010.00005bc4@Huawei.com> <6b7c472b50049592cde912f04ca47c696caa2227.camel@intel.com> <6ce724e5c67d4f7530457897fa08d0a8ba5dd6d0.camel@intel.com> From: Aneesh Kumar K V In-Reply-To: <6ce724e5c67d4f7530457897fa08d0a8ba5dd6d0.camel@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: rSGB9dYJ_Jo1Db1hvrQGY9yC-pgX5EIF X-Proofpoint-GUID: 8cH7lq-A0U5FtmGo3wXCsVa7n35s9y52 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-25_03,2022-05-23_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 bulkscore=0 phishscore=0 mlxlogscore=999 clxscore=1015 malwarescore=0 suspectscore=0 adultscore=0 lowpriorityscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2205250046 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/25/22 2:33 PM, Ying Huang wrote: > On Tue, 2022-05-24 at 22:32 -0700, Wei Xu wrote: >> On Tue, May 24, 2022 at 1:24 AM Ying Huang wrote: >>> >>> On Tue, 2022-05-24 at 00:04 -0700, Wei Xu wrote: >>>> On Thu, May 19, 2022 at 8:06 PM Ying Huang wrote: >>>>> ... > > OK. Just to confirm. Does this mean that we will have fixed device ID, > for example, > > GPU memtier255 > DRAM (with CPU) memtier0 > PMEM memtier1 > > When we add a new memtier, it can be memtier254, or memter2? The rank > value will determine the real demotion order. > > I think you may need to send v3 to make sure everyone is at the same > page. > What we have implemented which we will send as RFC shortly is below. cd /sys/dekvaneesh@ubuntu-guest:~$ cd /sys/devices/system/ kvaneesh@ubuntu-guest:/sys/devices/system$ pwd /sys/devices/system kvaneesh@ubuntu-guest:/sys/devices/system$ ls clockevents clocksource container cpu edac memory memtier mpic node power kvaneesh@ubuntu-guest:/sys/devices/system$ cd memtier/ kvaneesh@ubuntu-guest:/sys/devices/system/memtier$ pwd /sys/devices/system/memtier kvaneesh@ubuntu-guest:/sys/devices/system/memtier$ ls default_rank max_rank memtier1 power uevent kvaneesh@ubuntu-guest:/sys/devices/system/memtier$ cat default_rank 1 kvaneesh@ubuntu-guest:/sys/devices/system/memtier$ cat max_rank 3 kvaneesh@ubuntu-guest:/sys/devices/system/memtier$ cd memtier1/ kvaneesh@ubuntu-guest:/sys/devices/system/memtier/memtier1$ ls nodelist power rank subsystem uevent kvaneesh@ubuntu-guest:/sys/devices/system/memtier/memtier1$ cat nodelist 0-3 kvaneesh@ubuntu-guest:/sys/devices/system/memtier/memtier1$ cat rank 1 kvaneesh@ubuntu-guest:/sys/devices/system/memtier/memtier1$ cd ../../node/node1/ kvaneesh@ubuntu-guest:/sys/devices/system/node/node1$ cat memtier 1 kvaneesh@ubuntu-guest:/sys/devices/system/node/node1$ root@ubuntu-guest:/sys/devices/system/node/node1# echo 0 > memtier root@ubuntu-guest:/sys/devices/system/node/node1# cat memtier 0 root@ubuntu-guest:/sys/devices/system/node/node1# cd ../../memtier/ root@ubuntu-guest:/sys/devices/system/memtier# ls default_rank max_rank memtier0 memtier1 power uevent root@ubuntu-guest:/sys/devices/system/memtier# cd memtier0/ root@ubuntu-guest:/sys/devices/system/memtier/memtier0# cat nodelist 1 root@ubuntu-guest:/sys/devices/system/memtier/memtier0# cat rank 0 root@ubuntu-guest:/sys/devices/system/memtier/memtier0# echo 4 > rank bash: rank: Permission denied root@ubuntu-guest:/sys/devices/system/memtier/memtier0#