Messages in this thread | ![/](/images/icornerl.gif) | | From | Peter Newman <> | Date | Fri, 17 May 2024 14:51:28 -0700 | Subject | Re: [RFC PATCH v3 00/17] x86/resctrl : Support AMD Assignable Bandwidth Monitoring Counters (ABMC) |
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Hi Reinette, Babu,
On Fri, May 3, 2024 at 2:15 PM Reinette Chatre <reinette.chatre@intel.com> wrote: > > Hi Peter, > > On 5/3/2024 2:00 PM, Peter Newman wrote: > > Hi Babu, > > > > On Fri, May 3, 2024 at 1:44 PM Moger, Babu <bmoger@amd.com> wrote: > >> > >> Hi Peter, > >> > >> On 5/2/2024 7:57 PM, Peter Newman wrote: > >>> Hi Reinette, > >>> > >>> On Thu, May 2, 2024 at 4:21 PM Reinette Chatre > >>>> I do think ABMC should be enabled by default when available and it looks > >>>> to be what this series aims to do [1]. The way I reason about this is > >>>> that legacy user space gets more reliable monitoring behavior without > >>>> needing to change behavior. > >>> > >>> I don't like that for a monitor assignment-aware user, following the > >>> creation of new monitoring groups, there will be less monitors > >>> available for assignment. If the user wants precise control over where > >>> monitors are allocated, they would need to manually unassign the > >>> automatically-assigned monitor after creating new groups. > >>> > >>> It's an annoyance, but I'm not sure if it would break any realistic > >>> usage model. Maybe if the monitoring agent operates independently of > >> > >> Yes. Its annoyance. > >> > >> But if you think about it, normal users don't create too many groups. > >> They wont have to worry about assign/unassign headache if we enable > >> monitor assignment automatically. Also there is pqos tool which uses > >> this interface. It does not have to know about assign/unassign stuff. > > > > Thinking about this again, I don't think it's much of a concern > > because the automatic assignment on mongroup creation behavior can be > > trivially disabled using a boolean flag. > > This could be a config option.
I'd like to work out the details of this option.
info/L3_MON/mbm_assign_on_mkdir?
boolean (parsed with kstrtobool()), defaulting to true?
-Peter
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