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Date: Thu, 8 Sep 2022 11:07:59 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Babu Moger <babu.moger@....com>
Cc: corbet@....net, reinette.chatre@...el.com, tglx@...utronix.de,
mingo@...hat.com, bp@...en8.de, 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,
eranian@...gle.com
Subject: Re: [PATCH v4 13/13] Documentation/x86: Update resctrl_ui.rst for
new features
On Wed, Sep 07, 2022 at 01:01:29PM -0500, 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 processor
> and specifying allocations or limits for that COS for each resource
> 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 are memory events. With the
> feature BMEC, the users have the option to configure mbm_total_bytes
> and mbm_local_bytes to count the specific type of events.
>
> Also add configuration instructions with examples.
>
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
> Documentation/x86/resctrl.rst | 148 ++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 146 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
> index 71a531061e4e..56581587c1a3 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:
>
> -============================================= ================================
> +=============================================== ================================
> 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"
> -============================================= ================================
> +SMBA (Slow Memory Bandwidth Allocation) "smba"
> +BMEC (Bandwidth Monitoring Event Configuration) "bmec"
> +=============================================== ================================
>
> To use the feature mount the file system::
>
> @@ -161,6 +163,23 @@ with the following files:
> "mon_features":
> Lists the monitoring events if
> monitoring is enabled for the resource.
> + Example output:
> +
> + # cat /sys/fs/resctrl/info/L3_MON/mon_features
> + llc_occupancy
> + mbm_total_bytes
> + mbm_local_bytes
> +
> + If the system supports Bandwidth Monitoring Event
> + Configuration (BMEC), then the bandwidth events will
> + be configurable. Then the output will be.
> +
> + # cat /sys/fs/resctrl/info/L3_MON/mon_features
> + llc_occupancy
> + mbm_total_bytes
> + mbm_total_config
> + mbm_local_bytes
> + mbm_local_config
>
Use code blocks for terminal output above:
---- >8 ----
t a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
index 56581587c1a331..6474cf655792bf 100644
--- a/Documentation/x86/resctrl.rst
+++ b/Documentation/x86/resctrl.rst
@@ -163,23 +163,23 @@ with the following files:
"mon_features":
Lists the monitoring events if
monitoring is enabled for the resource.
- Example output:
+ Example::
- # cat /sys/fs/resctrl/info/L3_MON/mon_features
- llc_occupancy
- mbm_total_bytes
- mbm_local_bytes
+ # cat /sys/fs/resctrl/info/L3_MON/mon_features
+ llc_occupancy
+ mbm_total_bytes
+ mbm_local_bytes
If the system supports Bandwidth Monitoring Event
Configuration (BMEC), then the bandwidth events will
- be configurable. Then the output will be.
+ be configurable. The output will be::
- # cat /sys/fs/resctrl/info/L3_MON/mon_features
- llc_occupancy
- mbm_total_bytes
- mbm_total_config
- mbm_local_bytes
- mbm_local_config
+ # cat /sys/fs/resctrl/info/L3_MON/mon_features
+ llc_occupancy
+ mbm_total_bytes
+ mbm_total_config
+ mbm_local_bytes
+ mbm_local_config
"max_threshold_occupancy":
Read/write file provides the largest value (in
> + Following are the types of events supported:
> +
> + ==== ========================================================
> + Bits Description
> + ==== ========================================================
> + 6 Dirty Victims from the QOS domain to all types of memory
> + 5 Reads to slow memory in the non-local NUMA domain
> + 4 Reads to slow memory in the local NUMA domain
> + 3 Non-temporal writes to non-local NUMA domain
> + 2 Non-temporal writes to local NUMA domain
> + 1 Reads to memory in the non-local NUMA domain
> + 0 Reads to memory in the local NUMA domain
> + ==== ========================================================
> +
The table above looks OK.
Thanks.
--
An old man doll... just what I always wanted! - Clara
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