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Message-ID: <YzPMorJQFKPY+n4d@debian.me>
Date: Wed, 28 Sep 2022 11:25:06 +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 v5 12/12] Documentation/x86: Update resctrl_ui.rst for
new features
On Tue, Sep 27, 2022 at 03:27:00PM -0500, Babu Moger wrote:
> + 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
> + ==== ========================================================
> +
> + By default, the mbm_total_bytes configuration is set to 0x7f to count
> + all the event types and the mbm_local_bytes configuration is set to
> + 0x15 to count all the local memory events.
> +
> + Example::
> +
> + To view the current configuration, run the command.
> + # cat /sys/fs/resctrl/info/L3_MON/mbm_total_config
> + 0:0x7f;1:0x7f;2:0x7f;3:0x7f
> +
> + # cat /sys/fs/resctrl/info/L3_MON/mbm_local_config
> + 0:0x15;1:0x15;3:0x15;4:0x15
> +
> + To change the mbm_total_bytes to count only reads on domain 0,
> + run the command. The bits 0,1,4 and 5 needs to set.
> +
> + # echo "0:0x33" > /sys/fs/resctrl/info/L3_MON/mbm_total_config
> +
> + # cat /sys/fs/resctrl/info/L3_MON/mbm_total_config
> + 0:0x33;1:0x7f;2:0x7f;3:0x7f
> +
> + To change the mbm_local_bytes to count all the slow memory reads on
> + domain 1, run the command. The bits 4 and 5 needs to set.
> +
> + # echo "1:0x30" > /sys/fs/resctrl/info/L3_MON/mbm_local_config
> +
> + # cat /sys/fs/resctrl/info/L3_MON/mbm_local_config
> + 0:0x15;1:0x30;3:0x15;4:0x15
>
Hi Babu,
The description text for each snippets above shouldn't in the code
block. Also, split the block into three code blocks in the lists:
---- >8 ----
diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
index b4fe54f219b6f3..ec578b069276ce 100644
--- a/Documentation/x86/resctrl.rst
+++ b/Documentation/x86/resctrl.rst
@@ -206,25 +206,26 @@ with the following files:
all the event types and the mbm_local_bytes configuration is set to
0x15 to count all the local memory events.
- Example::
+ Examples:
+
+ * To view the current configuration::
- To view the current configuration, run the command.
# cat /sys/fs/resctrl/info/L3_MON/mbm_total_config
0:0x7f;1:0x7f;2:0x7f;3:0x7f
# cat /sys/fs/resctrl/info/L3_MON/mbm_local_config
0:0x15;1:0x15;3:0x15;4:0x15
- To change the mbm_total_bytes to count only reads on domain 0,
- run the command. The bits 0,1,4 and 5 needs to set.
+ * To change the mbm_total_bytes to count only reads on domain 0
+ (the bits 0, 1, 4 and 5 needs to be set)::
# echo "0:0x33" > /sys/fs/resctrl/info/L3_MON/mbm_total_config
# cat /sys/fs/resctrl/info/L3_MON/mbm_total_config
0:0x33;1:0x7f;2:0x7f;3:0x7f
- To change the mbm_local_bytes to count all the slow memory reads on
- domain 1, run the command. The bits 4 and 5 needs to set.
+ * To change the mbm_local_bytes to count all the slow memory reads on
+ domain 1 (the bits 4 and 5 needs to be set)::
# echo "1:0x30" > /sys/fs/resctrl/info/L3_MON/mbm_local_config
Also, there isn't description of mapping from bits from the supported events
table to the bytes input for mbm_{total,local}_config.
> +Slow Memory b/w domain is L3 cache.
> +::
> +
> + SMBA:<cache_id0>=bandwidth0;<cache_id1>=bandwidth1;...
> +
What b/w stands for in the context above?
> Reading/writing the schemata file
> ---------------------------------
> Reading the schemata file will show the state of all resources
> @@ -479,6 +567,44 @@ which you wish to change. E.g.
> L3DATA:0=fffff;1=fffff;2=3c0;3=fffff
> L3CODE:0=fffff;1=fffff;2=fffff;3=fffff
>
> +Reading/writing the schemata file (on AMD systems)
> +--------------------------------------------------
> +Reading the schemata file will show the state of all resources
> +on all domains. When writing the memory bandwidth allocation you
> +only need to specify those values in an absolute number expressed
> +in 1/8 GB/s increments. To allocate bandwidth limit of 2GB, you
> +need to specify the value 16 (16 * 1/8 = 2). E.g.
> <snipped>...
> +Reading the schemata file will show the state of all resources
> +on all domains. When writing the memory bandwidth allocation you
> +only need to specify those values in an absolute number expressed
> +in 1/8 GB/s increments. To allocate bandwidth limit of 8GB, you
> +need to specify the value 64 (64 * 1/8 = 8). E.g.
s/E.g./For example:/
Thanks.
--
An old man doll... just what I always wanted! - Clara
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