linux-kernel - Re: [PATCH v9 9/9] x86/resctrl: Display RMID of resource group

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Message-ID: <1b6d1121-00a8-5f30-26fd-d5137fe9d9c1@amd.com>
Date:   Tue, 12 Sep 2023 12:39:39 -0500
From:   "Moger, Babu" <babu.moger@....com>
To:     Reinette Chatre <reinette.chatre@...el.com>, corbet@....net,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de
Cc:     fenghua.yu@...el.com, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, paulmck@...nel.org, akpm@...ux-foundation.org,
        quic_neeraju@...cinc.com, rdunlap@...radead.org,
        damien.lemoal@...nsource.wdc.com, songmuchun@...edance.com,
        peterz@...radead.org, jpoimboe@...nel.org, pbonzini@...hat.com,
        chang.seok.bae@...el.com, pawan.kumar.gupta@...ux.intel.com,
        jmattson@...gle.com, daniel.sneddon@...ux.intel.com,
        sandipan.das@....com, tony.luck@...el.com, james.morse@....com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bagasdotme@...il.com, eranian@...gle.com,
        christophe.leroy@...roup.eu, jarkko@...nel.org,
        adrian.hunter@...el.com, quic_jiles@...cinc.com,
        peternewman@...gle.com
Subject: Re: [PATCH v9 9/9] x86/resctrl: Display RMID of resource group

Hi Reinette,


On 9/11/23 18:08, Reinette Chatre wrote:
> Hi Babu,
> 
> On 9/7/2023 4:51 PM, Babu Moger wrote:
>> In x86, hardware uses RMID to identify a a monitoring group. When a
>> user creates a monitor group these details are not visible. These details
>> can help resctrl debugging.
>>
>> Add RMID(mon_hw_id) to the monitor groups display in resctrl interface.
>> Users can see these details when resctrl is mounted with "-o debug" option.
>>
>> Other architectures do not use "RMID". Use the name mon_hw_id to refer
>> to "RMID" in an effort to keep the naming generic.
>>
>> Add the flag RFTYPE_MON_BASE, which contains the files required only
>> for the MON group.
> 
> As I mentioned in [1] I believe adding support for files with RFTYPE_MON flag
> to resctrl needs to be in a separate patch. With the core support added a file
> with this flag can be introduced separately. 

Yes. We discussed it. Thought it may not fit as a separate patch on its
own. So, i combined it.

Now, I split patch 9 into two. Let me know if it looks ok.

==========================================================================

Author: Babu Moger <babu.moger@....com>
Date:   Thu Sep 7 18:51:28 2023 -0500

    x86/resctrl: Add RFTYPE_MON_BASE for MON groups

    Add the flag RFTYPE_MON_BASE, which contains the files required only
    for the MON group. Files with these flags are only visible when
    monitoring is enabled.

    Signed-off-by: Babu Moger <babu.moger@....com>

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h
b/arch/x86/kernel/cpu/resctrl/internal.h
index ccdbed615d41..72988e5c52a7 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -296,6 +296,8 @@ struct rdtgroup {
  *     --> RFTYPE_BASE (Files common for both MON and CTRL groups)
  *         Files: cpus, cpus_list, tasks
  *
+ *             --> RFTYPE_MON (Files only for MON group)
+ *
  *             --> RFTYPE_CTRL (Files only for CTRL group)
  *                 Files: mode, schemata, size
  *
@@ -315,6 +317,7 @@ struct rdtgroup {
 #define RFTYPE_MON_INFO                        (RFTYPE_INFO | RFTYPE_MON)
 #define RFTYPE_TOP_INFO                        (RFTYPE_INFO | RFTYPE_TOP)
 #define RFTYPE_CTRL_BASE               (RFTYPE_BASE | RFTYPE_CTRL)
+#define RFTYPE_MON_BASE                        (RFTYPE_BASE | RFTYPE_MON)

 /* List of all resource groups */
 extern struct list_head rdt_all_groups;

=============================================================================
Thanks
Babu Moger