Hi Tony/Reinette, On 4/16/25 11:21, Reinette Chatre wrote: > Hi Tony, > > On 4/15/25 12:25 PM, Luck, Tony wrote: >>> By default, each resctrl group supports two MBM events: mbm_total_bytes >>> and mbm_local_bytes. These represent total and local memory bandwidth >>> monitoring, respectively. Each event corresponds to a specific MBM >>> configuration. Use these default configurations to set up the counters >>> during mount. Allow users to modify the configurations as needed after >>> initialization. >> >> I think an update to this part of the resctrl.rst documentation is somewhat >> overdue: >> >> In a MON group these files provide a read out of the current >> value of the event for all tasks in the group. In CTRL_MON groups >> these files provide the sum for all tasks in the CTRL_MON group >> and all tasks in MON groups. Please see example section for more >> details on usage. >> >> The sentence about CTRL_MON groups providing the sum for all tasks >> in the child MON groups is only true if counters are assigned to all of >> those MON groups. What mon_event_count() actually does is to >> return success if any of the CTRL_MON or child MON groups succeeded >> with the count being the sum of all the successes. > > Thanks for catching this. This would be important to highlight so that > user space does not have impression that events of CTRL_MON can be > used as estimate for MON groups that do not have counters assigned. > Sure. Will add text about it. -- Thanks Babu Moger
