config-linux: define default clos for linux.intelRdt #1289
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Specify "." as an explicit value for linux.intelRdt.closID to assign a container to the default CLOS, corresponding to the root of the resctrl filesystem. This addition is important after the recently introduced intelRdt.enableMonitoring field. There is no way to express "enable monitoring but keep the container in the default CLOS". Users would otherwise have to rely on pre-created CLOSes or may quickly exhaust available CLOS entries - in some configurations the number of available CLOSes (on top of the default) may be as low as three. Signed-off-by: Markus Lehtonen <[email protected]>
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| @@ -742,6 +742,8 @@ If `intelRdt` is not set, the runtime MUST NOT manipulate any `resctrl` pseudo-f | |||
| The following parameters can be specified for the container: | |||
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| * **`closID`** *(string, OPTIONAL)* - specifies the identity for RDT Class of Service (CLOS). | |||
| As a special case, value `.` means that the container should be assigned to the default CLOS (the | |||
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would '/' be more explicit? The value '.' looks to me like the expectation is the "current CLOS"
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I'm fine with this, too. I was struggling with the name myself
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Specify "." as an explicit value for linux.intelRdt.closID to assign a container to the default CLOS, corresponding to the root of the resctrl filesystem.
This addition is important after the recently introduced intelRdt.enableMonitoring field. There is no way to express "enable monitoring but keep the container in the default CLOS". Users would otherwise have to rely on pre-created CLOSes or may quickly exhaust available CLOS entries - in some configurations the number of available CLOSes (on top of the default) may be as low as three.
Note
Alternative names I considered were e.g.
/,/default,/root,default/,root/(i.e. something that is not a possible/valid > name in the resctrl fs). Eventually ended up with.which naturally refers to the resctrl root directory with smaller risk for implementation mistakes, e.g. writing to the root filesystem of the system