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If we use possible flags of: >>>>>> >>>>>> mbm_local_read_bytes a >>>>>> mbm_local_write_bytes b >>>>>> >>>>>> Then mbm_assign_control can be used as: >>>>>> # echo '//0=ab;1=b' >/sys/fs/resctrl/info/L3_MON/mbm_assign_control >>>>>> # cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_local_read_bytes >>>>>> >>>>>> # cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_local_bytes >>>>>> >>>>>> >>>>>> One issue would be when resctrl needs to support more than 26 events (no more flags available), >>>>>> assuming that upper case would be used for "shared" counters (unless this interface is defined >>>>>> differently and only few uppercase letters used for it). Would this be too low of a limit? >> >> As mentioned above, one possible issue with existing interface is that >> it is limited to 26 events (assuming only lower case letters are used). The limit >> is low enough to be of concern. > > The events which can be monitored by a single counter on ABMC and MPAM > so far are combinable, so 26 counters per group today means it limits > breaking down MBM traffic for each group 26 ways. If a user complained > that a 26-way breakdown of a group's MBM traffic was limiting their > investigation, I would question whether they know what they're looking > for. Based on the discussion so far, it felt like it is not a group level breakdown. It is kind of global level breakdown. I could be wrong here. My understanding so far, MPAM has a number of global counters. It can be assigned to any domain in the system and monitor events. They also have a way to configure the events (read, write or both). Both these feature are inline with current resctrl implementation and can be easily adapted. One thing I am not clear why MPAM implementation plans to create separate files(dynamically) in /sys/fs/resctrl/info/L3_MON/ directory to read the events. We already have files in each group to read the events. # ls -l /sys/fs/resctrl/mon_data/mon_L3_00/ total 0 -r--r--r--. 1 root root 0 Feb 17 08:16 llc_occupancy -r--r--r--. 1 root root 0 Feb 17 08:16 mbm_local_bytes -r--r--r--. 1 root root 0 Feb 17 08:16 mbm_total_bytes -- Thanks Babu Moger