RE: [PATCH v4 0/7] x86/resctrl: Miscellaneous resctrl features

[Moger, Babu]

[AMD Official Use Only - General]

Hi Reinette,

> -----Original Message-----
> From: Reinette Chatre <reinette.chatre@xxxxxxxxx>
> Sent: Friday, May 5, 2023 12:47 PM
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> Subject: Re: [PATCH v4 0/7] x86/resctrl: Miscellaneous resctrl features
> 
> Hi Babu,
> 
> On 5/5/2023 8:43 AM, Moger, Babu wrote:
> > [AMD Official Use Only - General]
> >
> > Hi Reinette,
> >
> >> -----Original Message-----
> >> From: Reinette Chatre <reinette.chatre@xxxxxxxxx>
> >> Sent: Thursday, May 4, 2023 1:54 PM
> >> To: Moger, Babu <Babu.Moger@xxxxxxx>; corbet@xxxxxxx;
> >> tglx@xxxxxxxxxxxxx; mingo@xxxxxxxxxx; bp@xxxxxxxxx
> >> Cc: fenghua.yu@xxxxxxxxx; dave.hansen@xxxxxxxxxxxxxxx;
> >> x86@xxxxxxxxxx; hpa@xxxxxxxxx; paulmck@xxxxxxxxxx;
> >> akpm@xxxxxxxxxxxxxxxxxxxx; quic_neeraju@xxxxxxxxxxx;
> >> rdunlap@xxxxxxxxxxxxx; damien.lemoal@xxxxxxxxxxxxxxxxxx;
> >> songmuchun@xxxxxxxxxxxxx; peterz@xxxxxxxxxxxxx;
> jpoimboe@xxxxxxxxxx;
> >> pbonzini@xxxxxxxxxx; chang.seok.bae@xxxxxxxxx;
> >> pawan.kumar.gupta@xxxxxxxxxxxxxxx;
> >> jmattson@xxxxxxxxxx; daniel.sneddon@xxxxxxxxxxxxxxx; Das1, Sandipan
> >> <Sandipan.Das@xxxxxxx>; tony.luck@xxxxxxxxx; james.morse@xxxxxxx;
> >> linux-doc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> >> bagasdotme@xxxxxxxxx; eranian@xxxxxxxxxx;
> >> christophe.leroy@xxxxxxxxxx; jarkko@xxxxxxxxxx;
> >> adrian.hunter@xxxxxxxxx; quic_jiles@xxxxxxxxxxx;
> >> peternewman@xxxxxxxxxx
> >> Subject: Re: [PATCH v4 0/7] x86/resctrl: Miscellaneous resctrl
> >> features
> >>
> 
> ...
> 
> >>>     Tried to address Reinette's comment on patch 7. But due to
> >>> current code
> >> design
> >>>     I could not do it exact way. But changed it little bit to make it easy debug
> >>>     file additions in the future.
> >>
> >> Could you please elaborate? It actually looks like you may be headed
> >> there next according to:
> >> https://lore.kernel.org/lkml/933d8ae2-d8b7-7436-5918-
> >> f639405c9ecb@xxxxxxx/
> >
> > Sorry, I was talking about this comment.
> > https://lore.kernel.org/lkml/fef12c9e-7d6f-bcd4-f92e-e776eb9e673b@inte
> > l.com/
> >
> > I tried to address it here.
> > https://lore.kernel.org/lkml/168177451010.1758847.568218491528297451.s
> > tgit@bmoger-ubuntu/
> >
> > This may not be the exact way you mentioned.  Reason is, adding the
> > flags before rdtgroup_add_files cannot be done. It does not update the
> > resctrl root filesystem. These files have to added by calling
> > rdtgroup_add_file and kernfs_activate in rdt_enable_ctx.
> I think what you are referring to is files not appearing in the default resource
> group? From what I can tell the files should appear when new resource groups
> are created. Could the default resource group's files not also be added on
> resctrl mount (moved from rdtgroup_setup_root() to rdt_get_tree())?

Yes. I can try that.

> I do not see why the files belonging to the default group are required to be
> added before resctrl mount and with the move the resctrl_debug flag can
> continue to be set in rdt_enable_ctx() and available to rdtgroup_add_files()
> when adding the default resource group's files.
> 
> To me this sounds simpler since there is no duplicate file add/remove code, and
> the debug files are just another file type.

Yes. If it works then It will make code simple. Will try and let you know.
Thanks
Babu