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

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Message-ID: <874jwyjyy9.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date:   Fri, 23 Sep 2022 16:07:42 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.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

"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?

> 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]