linux-kernel - Re: [PATCH v4] mm/demotion: Expose memory tier details via sysfs

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Message-ID: <3a966604-77c5-e6fc-1541-2fed7c71cc0c@linux.ibm.com>
Date:   Fri, 23 Sep 2022 16:05:30 +0530
From:   Aneesh Kumar K V <aneesh.kumar@...ux.ibm.com>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        Wei Xu <weixugc@...gle.com>, Yang Shi <shy828301@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim C Chen <tim.c.chen@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alistair Popple <apopple@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Johannes Weiner <hannes@...xchg.org>, jvgediya.oss@...il.com,
        Bharata B Rao <bharata@....com>
Subject: Re: [PATCH v4] mm/demotion: Expose memory tier details via sysfs

On 9/23/22 1:37 PM, Huang, Ying wrote:
> "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com> 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
> 
> It appears that XXXs is used for mask while XXXs_list is used for list?
> For example,
> 
> # cat /sys/devices/system/cpu/cpu2/topology/core_cpus
> 0,00100004
> # cat /sys/devices/system/cpu/cpu2/topology/core_cpus_list
> 2,20
> 
> It's better to follow the this convention?
> 

That is not followed in other parts of the kernel. I was loking at cpuset 

$cat cpuset.cpus.effective 
0-7




>> A directory hierarchy looks like
>> :/sys/devices/virtual/memory_tiering$ tree memory_tier4/
>> memory_tier4/
>> ├── nodes
>> ├── subsystem -> ../../../../bus/memory_tiering
>> └── uevent
>>
>> :/sys/devices/virtual/memory_tiering$ cat memory_tier4/nodes
>> 0,2
>>
>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> 
> Best Regards,
> Huang, Ying
> 
> [snip]