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Subject: RE: [PATCH v11 13/13] Documentation/x86: Update resctrl.rst for new
 features
Thread-Topic: [PATCH v11 13/13] Documentation/x86: Update resctrl.rst for new
 features
Thread-Index: AQHZJEmrk2z3hSULUk6NOZBmDO6S+K6ZyWMAgAAHQRCAAAaKAIAAHsxg
Date:   Thu, 12 Jan 2023 00:47:46 +0000
Message-ID: <MW3PR12MB45534504C044EBAEABA9E9E295FD9@MW3PR12MB4553.namprd12.prod.outlook.com>
References: <20230109164405.569714-1-babu.moger@amd.com>
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 <c7d563ce-13d9-ca6b-a5c9-7e08a3cdc3a9@intel.com>
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[AMD Official Use Only - General]

Hi Reinette,

> -----Original Message-----
> From: Reinette Chatre <reinette.chatre@intel.com>
> Sent: Wednesday, January 11, 2023 4:56 PM
> To: Moger, Babu <Babu.Moger@amd.com>; corbet@lwn.net;
> tglx@linutronix.de; mingo@redhat.com; bp@alien8.de
> Cc: fenghua.yu@intel.com; dave.hansen@linux.intel.com; x86@kernel.org;
> hpa@zytor.com; paulmck@kernel.org; akpm@linux-foundation.org;
> quic_neeraju@quicinc.com; rdunlap@infradead.org;
> damien.lemoal@opensource.wdc.com; songmuchun@bytedance.com;
> peterz@infradead.org; jpoimboe@kernel.org; pbonzini@redhat.com;
> chang.seok.bae@intel.com; pawan.kumar.gupta@linux.intel.com;
> jmattson@google.com; daniel.sneddon@linux.intel.com; Das1, Sandipan
> <Sandipan.Das@amd.com>; tony.luck@intel.com; james.morse@arm.com;
> linux-doc@vger.kernel.org; linux-kernel@vger.kernel.org;
> bagasdotme@gmail.com; eranian@google.com; christophe.leroy@csgroup.eu;
> jarkko@kernel.org; adrian.hunter@intel.com; quic_jiles@quicinc.com;
> peternewman@google.com
> Subject: Re: [PATCH v11 13/13] Documentation/x86: Update resctrl.rst for =
new
> features
>=20
> Hi Babu,
>=20
> On 1/11/2023 2:39 PM, Moger, Babu wrote:
> > [AMD Official Use Only - General]
> >
> > Hi Reinette,
> >
> >> -----Original Message-----
> >> From: Reinette Chatre <reinette.chatre@intel.com>
> >> Sent: Wednesday, January 11, 2023 4:07 PM
> >> To: Moger, Babu <Babu.Moger@amd.com>; corbet@lwn.net;
> >> tglx@linutronix.de; mingo@redhat.com; bp@alien8.de
> >> Cc: fenghua.yu@intel.com; dave.hansen@linux.intel.com;
> >> x86@kernel.org; hpa@zytor.com; paulmck@kernel.org;
> >> akpm@linux-foundation.org; quic_neeraju@quicinc.com;
> >> rdunlap@infradead.org; damien.lemoal@opensource.wdc.com;
> >> songmuchun@bytedance.com; peterz@infradead.org;
> jpoimboe@kernel.org;
> >> pbonzini@redhat.com; chang.seok.bae@intel.com;
> >> pawan.kumar.gupta@linux.intel.com;
> >> jmattson@google.com; daniel.sneddon@linux.intel.com; Das1, Sandipan
> >> <Sandipan.Das@amd.com>; tony.luck@intel.com; james.morse@arm.com;
> >> linux-doc@vger.kernel.org; linux-kernel@vger.kernel.org;
> >> bagasdotme@gmail.com; eranian@google.com;
> >> christophe.leroy@csgroup.eu; jarkko@kernel.org;
> >> adrian.hunter@intel.com; quic_jiles@quicinc.com;
> >> peternewman@google.com
> >> Subject: Re: [PATCH v11 13/13] Documentation/x86: Update resctrl.rst
> >> for new features
> >>
> >> Hi Babu,
> >>
> >> On 1/9/2023 8:44 AM, Babu Moger wrote:
> >>> Update the documentation for the new features:
> >>> 1. Slow Memory Bandwidth allocation (SMBA).
> >>>    With this feature, the QOS  enforcement policies can be applied
> >>>    to the external slow memory connected to the host. QOS enforcement
> >>>    is accomplished by assigning a Class Of Service (COS) to a process=
or
> >>>    and specifying allocations or limits for that COS for each resourc=
e
> >>>    to be allocated.
> >>>
> >>> 2. Bandwidth Monitoring Event Configuration (BMEC).
> >>>    The bandwidth monitoring events mbm_total_bytes and
> mbm_local_bytes
> >>>    are set to count all the total and local reads/writes respectively=
.
> >>>    With the introduction of slow memory, the two counters are not
> >>>    enough to count all the different types of memory events. With the
> >>>    feature BMEC, the users have the option to configure mbm_total_byt=
es
> >>>    and mbm_local_bytes to count the specific type of events.
> >>>
> >>> Also add configuration instructions with examples.
> >>>
> >>> Signed-off-by: Babu Moger <babu.moger@amd.com>
> >>> ---
> >>>  Documentation/x86/resctrl.rst | 142
> >>> +++++++++++++++++++++++++++++++++-
> >>>  1 file changed, 140 insertions(+), 2 deletions(-)
> >>>
> >>> diff --git a/Documentation/x86/resctrl.rst
> >>> b/Documentation/x86/resctrl.rst index 71a531061e4e..2860856f4463
> >>> 100644
> >>> --- a/Documentation/x86/resctrl.rst
> >>> +++ b/Documentation/x86/resctrl.rst
> >>> @@ -17,14 +17,16 @@ AMD refers to this feature as AMD Platform
> >>> Quality
> >> of Service(AMD QoS).
> >>>  This feature is enabled by the CONFIG_X86_CPU_RESCTRL and the x86
> >>> /proc/cpuinfo  flag bits:
> >>>
> >>> -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >> 	=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >>> +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >> 	=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >>>  RDT (Resource Director Technology) Allocation	"rdt_a"
> >>>  CAT (Cache Allocation Technology)		"cat_l3", "cat_l2"
> >>>  CDP (Code and Data Prioritization)		"cdp_l3", "cdp_l2"
> >>>  CQM (Cache QoS Monitoring)			"cqm_llc",
> >> "cqm_occup_llc"
> >>>  MBM (Memory Bandwidth Monitoring)		"cqm_mbm_total",
> >> "cqm_mbm_local"
> >>>  MBA (Memory Bandwidth Allocation)		"mba"
> >>> -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >> 	=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >>> +SMBA (Slow Memory Bandwidth Allocation)         "smba"
> >>> +BMEC (Bandwidth Monitoring Event Configuration) "bmec"
> >>> +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >> 	=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >>>
> >>
> >> I expect that you will follow Boris's guidance here and not make
> >> these flags visible in /proc/cpuinfo. That would imply that this
> >> addition will have no entries in the second column. Perhaps this
> >> could be made easier to parse by using empty quotes ("") in the
> >> second column to match syntax used in the existing flags as well as th=
e
> cpufeatures.h change?
> >
> > Hmm.. I thought we dropped that idea for now. Did I miss understand tha=
t?
>=20
> I referred to the guidance in
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flore.=
kern
> el.org%2Flkml%2FY7xjxUj%2BKnOEJssZ%40zn.tnic%2F&data=3D05%7C01%7CBabu
> .Moger%40amd.com%7C900eb41c0e6049dd342208daf4270d2b%7C3dd8961fe
> 4884e608e11a82d994e183d%7C0%7C0%7C638090745842366944%7CUnknown
> %7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWw
> iLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3D%2F5GVOhnxq1%2B3nJwGtlAp
> vLfC%2FeX3X9RDaUZa9R92NiY%3D&reserved=3D0
> Since the SMBA and BMEC features have never appeared in /proc/cpuinfo
> there cannot be a user space that expects these flags in /proc/cpuinfo an=
d thus
> no risk of breaking user space. User space can get information about SMBA=
 and
> BMEC from the info directory.
>=20
> Later that thread discussed removal of existing resctrl feature flags fro=
m
> /proc/cpuinfo - that is what I think we shouldn't do since there are user=
 space
> consumers of those flags. I thus agree that the task described in
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flore.=
kern
> el.org%2Flkml%2FMW3PR12MB455384130AF0BDE3AF88BCF095FE9%40MW3P
> R12MB4553.namprd12.prod.outlook.com%2F&data=3D05%7C01%7CBabu.Moger
> %40amd.com%7C900eb41c0e6049dd342208daf4270d2b%7C3dd8961fe4884e6
> 08e11a82d994e183d%7C0%7C0%7C638090745842366944%7CUnknown%7CTW
> FpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVC
> I6Mn0%3D%7C3000%7C%7C%7C&sdata=3DkE7d0cFYyJq1n4ZKKeeF%2FC%2FFDDJ
> y0Sc%2Fd5MZ%2Bc56WQw%3D&reserved=3D0
> can be dropped.
>=20
> I do not think this is a big change ... just add the empty quotes to the =
two
> cpufeatures.h patches and a new snippet to the resctrl documentation.

Previous one got garbled. Here is the correct one.

diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
index 2860856f4463..7df5889237f4 100644
--- a/Documentation/x86/resctrl.rst
+++ b/Documentation/x86/resctrl.rst
@@ -24,10 +24,15 @@ CDP (Code and Data Prioritization)          "cdp_l3", "=
cdp_l2"
 CQM (Cache QoS Monitoring)                     "cqm_llc", "cqm_occup_llc"
 MBM (Memory Bandwidth Monitoring)              "cqm_mbm_total", "cqm_mbm_l=
ocal"
 MBA (Memory Bandwidth Allocation)              "mba"
-SMBA (Slow Memory Bandwidth Allocation)         "smba"
-BMEC (Bandwidth Monitoring Event Configuration) "bmec"
+SMBA (Slow Memory Bandwidth Allocation)         ""
+BMEC (Bandwidth Monitoring Event Configuration) ""
 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D      =
  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D

+Historically, new features were made visible by default in /proc/cpuinfo. =
This
+resulted in the feature flags becoming hard to parse by the humans. Adding=
 a new
+flag to /proc/cpuinfo should be avoided if user space can obtain informati=
on
+about the feature from resctrl's info directory.
+
 To use the feature mount the file system::

  # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps]] /sys/fs/resctrl