linux-kernel - Re: [RFC] memory tier, sysfs: rename attribute "nodes" to "nodes

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Date:   Tue, 18 Oct 2022 16:39:11 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Wei Xu <weixugc@...gle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Alistair Popple <apopple@...dia.com>,
        Bharata B Rao <bharata@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Jagdish Gediya <jvgediya.oss@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Michal Hocko <mhocko@...nel.org>,
        Tim Chen <tim.c.chen@...el.com>, Yang Shi <shy828301@...il.com>
Subject: Re: [RFC] memory tier, sysfs: rename attribute "nodes" to "nodes_list"

Wei Xu <weixugc@...gle.com> writes:

> How about "nodelist", instead of "nodes_list"?  It is more concise and
> follows the convention of:
>
> /sys/devices/system/nodes/node0/cpulist

Sounds good to me.

It seems that cpumap/cpulist is another pair of mask/list.

/sys/devices/system/node/node0/cpumap
/sys/devices/system/node/node0/cpulist

/sys/devices/system/cpu/cpu0/cache/index1/shared_cpu_map
/sys/devices/system/cpu/cpu0/cache/index1/shared_cpu_list

Best Regards,
Huang, Ying

> On Mon, Oct 17, 2022 at 10:26 PM Huang Ying <ying.huang@...el.com> wrote:
>>
>> In sysfs, we use attribute name "cpus" for cpu mask and "cpus_list"
>> for cpu list.  For example, in my system,
>>
>>  $ cat /sys/devices/system/cpu/cpu2/topology/core_cpus
>>  0,00100004
>>  $ cat /sys/devices/system/cpu/cpu2/topology/core_cpus_list
>>  2,20
>>
>> It looks reasonable to use "nodes" for node mask and "nodes_list" for
>> node list.  So, rename the attribute to follow the naming convention.
>>
>> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
>> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
>> Cc: Alistair Popple <apopple@...dia.com>
>> Cc: Bharata B Rao <bharata@....com>
>> Cc: Dan Williams <dan.j.williams@...el.com>
>> Cc: Dave Hansen <dave.hansen@...el.com>
>> Cc: Davidlohr Bueso <dave@...olabs.net>
>> Cc: Hesham Almatary <hesham.almatary@...wei.com>
>> Cc: Jagdish Gediya <jvgediya.oss@...il.com>
>> Cc: Johannes Weiner <hannes@...xchg.org>
>> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> Cc: Michal Hocko <mhocko@...nel.org>
>> Cc: Tim Chen <tim.c.chen@...el.com>
>> Cc: Wei Xu <weixugc@...gle.com>
>> Cc: Yang Shi <shy828301@...il.com>
>> ---
>>  Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers | 4 ++--
>>  mm/memory-tiers.c                                      | 8 ++++----
>>  2 files changed, 6 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers b/Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers
>> index 45985e411f13..af07e166f559 100644
>> --- a/Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers
>> +++ b/Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers
>> @@ -10,7 +10,7 @@ Description:  A collection of all the memory tiers allocated.
>>
>>
>>  What:          /sys/devices/virtual/memory_tiering/memory_tierN/
>> -               /sys/devices/virtual/memory_tiering/memory_tierN/nodes
>> +               /sys/devices/virtual/memory_tiering/memory_tierN/nodes_list
>>  Date:          August 2022
>>  Contact:       Linux memory management mailing list <linux-mm@...ck.org>
>>  Description:   Directory with details of a specific memory tier
>> @@ -21,5 +21,5 @@ Description:  Directory with details of a specific memory tier
>>                 A smaller value of N implies a higher (faster) memory tier in the
>>                 hierarchy.
>>
>> -               nodes: NUMA nodes that are part of this memory tier.
>> +               nodes_list: NUMA nodes that are part of this memory tier.
>>
>> diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
>> index f116b7b6333e..8dbfe9ec87d5 100644
>> --- a/mm/memory-tiers.c
>> +++ b/mm/memory-tiers.c
>> @@ -131,8 +131,8 @@ static void memory_tier_device_release(struct device *dev)
>>         kfree(tier);
>>  }
>>
>> -static ssize_t nodes_show(struct device *dev,
>> -                         struct device_attribute *attr, char *buf)
>> +static ssize_t nodes_list_show(struct device *dev,
>> +                              struct device_attribute *attr, char *buf)
>>  {
>>         int ret;
>>         nodemask_t nmask;
>> @@ -143,10 +143,10 @@ static ssize_t nodes_show(struct device *dev,
>>         mutex_unlock(&memory_tier_lock);
>>         return ret;
>>  }
>> -static DEVICE_ATTR_RO(nodes);
>> +static DEVICE_ATTR_RO(nodes_list);
>>
>>  static struct attribute *memtier_dev_attrs[] = {
>> -       &dev_attr_nodes.attr,
>> +       &dev_attr_nodes_list.attr,
>>         NULL
>>  };
>>
>> --
>> 2.35.1
>>