Hi Reinette,
On 9/19/2024 1:00 PM, Reinette Chatre wrote:
Hi Babu,
On 9/4/24 3:21 PM, Babu Moger wrote:
# Linux Implementation
Create a generic interface aimed to support user space assignment
of scarce counters used for monitoring. First usage of interface
is by ABMC with option to expand usage to "soft-ABMC" and MPAM
counters in future.
Feature adds following interface files:
/sys/fs/resctrl/info/L3_MON/mbm_assign_mode: Reports the list of assignable
monitoring features supported. The enclosed brackets indicate which
feature is enabled.
/sys/fs/resctrl/info/L3_MON/num_mbm_cntrs: Reports the number of monitoring
counters available for assignment.
/sys/fs/resctrl/info/L3_MON/mbm_assign_control: Reports the resctrl group and monitor
status of each group. Assignment state can be updated by writing to the
interface.
At this point I think the architecture is settling with the remaining work focusing
on polishing the code and making it more robust. To get confidence in this big addition
it will be valuable to hear from Peter and James to confirm if soft-ABMC and
MPAM can build on this.
Agree. Peter/James, Please let me know if there are any concerns with
the interface.
# Examples
a. Check if ABMC support is available
#mount -t resctrl resctrl /sys/fs/resctrl/
#cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode
[mbm_cntr_assign]
default
ABMC feature is detected and it is enabled.
b. Check how many ABMC counters are available.
#cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs
32
c. Create few resctrl groups.
# mkdir /sys/fs/resctrl/mon_groups/child_default_mon_grp
# mkdir /sys/fs/resctrl/non_default_ctrl_mon_grp
# mkdir /sys/fs/resctrl/non_default_ctrl_mon_grp/mon_groups/child_non_default_mon_grp
d. This series adds a new interface file /sys/fs/resctrl/info/L3_MON/mbm_assign_control
to list and modify the group's monitoring states. File provides single place
"modify the group's monitoring states" -> "modify any group's monitoring states"?
Sure.
to list monitoring states of all the resctrl groups. It makes it easier for
user space to to learn about the used counters without needing to traverse
"to to learn" -> "to learn"
Sure.
Reinette
Thanks
- Babu Moger
