Messages in this thread | | | Date | Wed, 25 May 2022 15:31:13 +0530 | Subject | Re: RFC: Memory Tiering Kernel Interfaces (v2) | From | Aneesh Kumar K V <> |
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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: >>>>>
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> > 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#
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