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Merge pull request #1104 from marquiz/devel/rdt
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config-linux: clarify the handling of ClosID RDT parameter
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vbatts committed Jul 9, 2021
2 parents 1c3f411 + 0c021c1 commit 8961758
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21 changes: 13 additions & 8 deletions config-linux.md
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Expand Up @@ -530,24 +530,29 @@ If `intelRdt` is not set, the runtime MUST NOT manipulate any `resctrl` pseudo-f
The following parameters can be specified for the container:

* **`closID`** *(string, OPTIONAL)* - specifies the identity for RDT Class of Service (CLOS).
If `closID` is set, runtimes MUST create `closID` directory in a mounted `resctrl` pseudo-filesystem if it doesn't exist. If not set, runtimes MUST use the container ID from [`start`](runtime.md#start) and create the `<container-id>` directory.

* **`l3CacheSchema`** *(string, OPTIONAL)* - specifies the schema for L3 cache id and capacity bitmask (CBM).
The value SHOULD start with `L3:` and SHOULD NOT contain newlines.
* **`memBwSchema`** *(string, OPTIONAL)* - specifies the schema of memory bandwidth per L3 cache id.
* The value MUST start with `MB:` and MUST NOT contain newlines.
The value MUST start with `MB:` and MUST NOT contain newlines.

* If both `l3CacheSchema` and `memBwSchema` are set, runtimes MUST write the combined value to the `schemata` file in that sub-directory discussed in `closID`.
The following rules on parameters MUST be applied:

* If `l3CacheSchema` contains a line beginning with `MB:`, the value written to `schemata` file MUST be the non-`MB:` line(s) from `l3CacheSchema` and the line from `memBWSchema`.
* If both `l3CacheSchema` and `memBwSchema` are set, runtimes MUST write the combined value to the `schemata` file in that sub-directory discussed in `closID`.

* If either `l3CacheSchema` or `memBwSchema` is set, runtimes MUST write the value to the `schemata` file in the that sub-directory discussed in `closID`.
* If `l3CacheSchema` contains a line beginning with `MB:`, the value written to `schemata` file MUST be the non-`MB:` line(s) from `l3CacheSchema` and the line from `memBWSchema`.

* If neither `l3CacheSchema` nor `memBwSchema` is set, runtimes MUST NOT write to `schemata` files in any `resctrl` pseudo-filesystems.
* If either `l3CacheSchema` or `memBwSchema` is set, runtimes MUST write the value to the `schemata` file in the that sub-directory discussed in `closID`.

* If `closID` is set, `l3CacheSchema` and/or `memBwSchema` is set, runtimes MUST compare `l3CacheSchema` and/or `memBwSchema` value with `schemata` file, and [generate an error](runtime.md#errors) if doesn't match.
* If neither `l3CacheSchema` nor `memBwSchema` is set, runtimes MUST NOT write to `schemata` files in any `resctrl` pseudo-filesystems.

* If `closID` is set, and neither of `l3CacheSchema` and `memBwSchema` are set, runtime MUST check if corresponding pre-configured directory `closID` is present in mounted `resctrl`. If such pre-configured directory `closID` exists, runtime MUST assign container to this `closID` and [generate an error](runtime.md#errors) if directory does not exist.
* If `closID` is not set, runtimes MUST use the container ID from [`start`](runtime.md#start) and create the `<container-id>` directory.

* If `closID` is set, `l3CacheSchema` and/or `memBwSchema` is set
* if `closID` directory in a mounted `resctrl` pseudo-filesystem doesn't exist, the runtimes MUST create it.
* if `closID` directory in a mounted `resctrl` pseudo-filesystem exists, runtimes MUST compare `l3CacheSchema` and/or `memBwSchema` value with `schemata` file, and [generate an error](runtime.md#errors) if doesn't match.

* If `closID` is set, and neither of `l3CacheSchema` and `memBwSchema` are set, runtime MUST check if corresponding pre-configured directory `closID` is present in mounted `resctrl`. If such pre-configured directory `closID` exists, runtime MUST assign container to this `closID` and [generate an error](runtime.md#errors) if directory does not exist.


### Example
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