From: "Mika Penttilä" <mpenttil@redhat.com>
To: Aneesh Kumar K V <aneesh.kumar@linux.ibm.com>,
Ying Huang <ying.huang@intel.com>, Wei Xu <weixugc@google.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Andrew Morton <akpm@linux-foundation.org>,
Greg Thelen <gthelen@google.com>, Yang Shi <shy828301@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jagdish Gediya <jvgediya@linux.ibm.com>,
Michal Hocko <mhocko@kernel.org>,
Tim C Chen <tim.c.chen@intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Alistair Popple <apopple@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Feng Tang <feng.tang@intel.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Dan Williams <dan.j.williams@intel.com>,
David Rientjes <rientjes@google.com>,
Linux MM <linux-mm@kvack.org>,
Brice Goglin <brice.goglin@gmail.com>,
Hesham Almatary <hesham.almatary@huawei.com>
Subject: Re: RFC: Memory Tiering Kernel Interfaces (v2)
Date: Wed, 25 May 2022 14:36:59 +0300 [thread overview]
Message-ID: <2d06932c-7d80-94c7-89ab-78375e58d3cc@redhat.com> (raw)
In-Reply-To: <594046f8-9ab3-786a-fc48-8a61f1238f52@linux.ibm.com>
On 25.5.2022 13.01, Aneesh Kumar K V wrote:
> 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 <ying.huang@intel.com> wrote:
>>>>
>>>> On Tue, 2022-05-24 at 00:04 -0700, Wei Xu wrote:
>>>>> On Thu, May 19, 2022 at 8:06 PM Ying Huang <ying.huang@intel.com>
>>>>> 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#
>
Just to confirm, unlike today's demotion code, the demotion target
allocation is planned to honor mempolicies?
--Mika
next prev parent reply other threads:[~2022-05-25 11:37 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-12 6:22 RFC: Memory Tiering Kernel Interfaces (v2) Wei Xu
2022-05-12 7:03 ` ying.huang
2022-05-12 7:12 ` Aneesh Kumar K V
2022-05-12 7:18 ` ying.huang
2022-05-12 7:22 ` Wei Xu
2022-05-12 7:36 ` Aneesh Kumar K.V
2022-05-12 8:15 ` Wei Xu
2022-05-12 8:37 ` ying.huang
2022-05-13 2:52 ` ying.huang
2022-05-13 7:00 ` Wei Xu
2022-05-16 1:57 ` ying.huang
2022-05-12 21:12 ` Tim Chen
2022-05-12 21:31 ` Wei Xu
2022-05-12 15:00 ` Jonathan Cameron
2022-05-18 7:09 ` Wei Xu
2022-05-18 12:00 ` Jonathan Cameron
2022-05-24 7:36 ` Wei Xu
2022-05-24 13:26 ` Aneesh Kumar K.V
2022-05-25 5:27 ` Wei Xu
2022-05-25 7:47 ` Alistair Popple
[not found] ` <20220525124847.00007a16@Huawei.com>
2022-05-25 15:32 ` Wei Xu
2022-05-20 3:06 ` Ying Huang
2022-05-24 7:04 ` Wei Xu
2022-05-24 8:24 ` Ying Huang
2022-05-25 5:32 ` Wei Xu
2022-05-25 9:03 ` Ying Huang
2022-05-25 10:01 ` Aneesh Kumar K V
2022-05-25 11:36 ` Mika Penttilä [this message]
2022-05-25 15:33 ` Wei Xu
2022-05-25 17:27 ` Wei Xu
2022-05-26 9:32 ` Jonathan Cameron
2022-05-26 20:30 ` Wei Xu
2022-05-27 9:26 ` Aneesh Kumar K V
2022-05-25 15:36 ` Wei Xu
2022-05-26 1:09 ` Ying Huang
2022-05-26 3:53 ` Wei Xu
2022-05-26 6:54 ` Ying Huang
2022-05-26 7:08 ` Wei Xu
2022-05-26 7:39 ` Ying Huang
2022-05-26 20:55 ` Wei Xu
2022-05-27 9:10 ` Jonathan Cameron
2022-05-30 6:54 ` Ying Huang
2022-05-13 3:25 ` ying.huang
2022-05-13 6:36 ` Wei Xu
2022-05-13 7:04 ` ying.huang
2022-05-13 7:21 ` Wei Xu
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