Re: RFC: Memory Tiering Kernel Interfaces (v2)

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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@xxxxxxxxx> 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@xxxxxxxxx> 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






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