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Fri, 2 Sep 2022 05:46:21 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D2CE44C04A; Fri, 2 Sep 2022 05:46:20 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 800C04C046; Fri, 2 Sep 2022 05:46:15 +0000 (GMT) Received: from [9.43.64.219] (unknown [9.43.64.219]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 2 Sep 2022 05:46:15 +0000 (GMT) Message-ID: <698120ce-d4df-3d13-dea9-a8f5c298783c@linux.ibm.com> Date: Fri, 2 Sep 2022 11:16:14 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.0 Subject: Re: [PATCH v3 updated] mm/demotion: Expose memory tier details via sysfs Content-Language: en-US To: "Huang, Ying" Cc: Wei Xu , Johannes Weiner , Linux MM , Andrew Morton , Yang Shi , Davidlohr Bueso , Tim C Chen , Michal Hocko , Linux Kernel Mailing List , Hesham Almatary , Dave Hansen , Jonathan Cameron , Alistair Popple , Dan Williams , jvgediya.oss@gmail.com, Bharata B Rao , Greg Thelen References: <20220830081736.119281-1-aneesh.kumar@linux.ibm.com> <87tu5rzigc.fsf@yhuang6-desk2.ccr.corp.intel.com> <87pmgezkhp.fsf@yhuang6-desk2.ccr.corp.intel.com> <87fshaz63h.fsf@yhuang6-desk2.ccr.corp.intel.com> From: Aneesh Kumar K V In-Reply-To: <87fshaz63h.fsf@yhuang6-desk2.ccr.corp.intel.com> Content-Type: text/plain; charset=UTF-8 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: fMk2BmpsOaAYWWmk2fjHWEPQEsq66UsJ X-Proofpoint-GUID: LTE2Qlv-iimLSGIL2cJnepsrskMFwPQr Content-Transfer-Encoding: 7bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-09-01_12,2022-08-31_03,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 mlxlogscore=999 impostorscore=0 bulkscore=0 malwarescore=0 clxscore=1015 adultscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2209020024 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1662097598; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; 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dmarc=pass (policy=none) header.from=ibm.com X-Rspamd-Server: rspam12 X-Rspam-User: X-HE-Tag: 1662097598-628040 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 9/2/22 11:10 AM, Huang, Ying wrote: > Aneesh Kumar K V writes: > >> On 9/2/22 10:39 AM, Wei Xu wrote: >>> On Thu, Sep 1, 2022 at 5:33 PM Huang, Ying wrote: >>>> >>>> Aneesh Kumar K V writes: >>>> >>>>> On 9/1/22 12:31 PM, Huang, Ying wrote: >>>>>> "Aneesh Kumar K.V" writes: >>>>>> >>>>>>> This patch adds /sys/devices/virtual/memory_tiering/ where all memory tier >>>>>>> related details can be found. All allocated memory tiers will be listed >>>>>>> there as /sys/devices/virtual/memory_tiering/memory_tierN/ >>>>>>> >>>>>>> The nodes which are part of a specific memory tier can be listed via >>>>>>> /sys/devices/virtual/memory_tiering/memory_tierN/nodes >>>>>> >>>>>> I think "memory_tier" is a better subsystem/bus name than >>>>>> memory_tiering. Because we have a set of memory_tierN devices inside. >>>>>> "memory_tier" sounds more natural. I know this is subjective, just my >>>>>> preference. >>>>>> >> >> >> I missed replying to this earlier. I will keep memory_tiering as subsystem name in v4 >> because we would want it to a susbsystem where all memory tiering related details can be found >> including memory type in the future. This is as per discussion >> >> https://lore.kernel.org/linux-mm/CAAPL-u9TKbHGztAF=r-io3gkX7gorUunS2UfstudCWuihrA=0g@mail.gmail.com > > I don't think that it's a good idea to mix 2 types of devices in one > subsystem (bus). If my understanding were correct, that breaks the > driver core convention. > All these are virtual devices .I am not sure i follow what you mean by 2 types of devices. memory_tiering is a subsystem that represents all the details w.r.t memory tiering. It shows details of memory tiers and can possibly contain details of different memory types . -aneesh