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In cgroups v2, a different map of memory stats is available from the kernel than in v1. The Docker API reflects this change. But there are equivalent values in the map for RSS (anonymously mapped memory) and cache (filesystem cache and tmpfs), which the Docker driver is not currently emitting. Fallback to these alternate values when the cgroups v1 values are not available. Include the anonymous mapping in the "measured" allocation stats as "RSS" so that they both show up in allocation metrics. We can do this on both the `docker` driver and the Linux executor for `exec` and `java` drivers. Fixes: https://github.com/hashicorp/nomad/issues/19185 Ref: https://hashicorp.atlassian.net/browse/NMD-437 Ref: https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html#memory-interface-files Ref: https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt
4 lines
151 B
Plaintext
4 lines
151 B
Plaintext
```release-note:bug
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metrics: Fixed a bug where RSS and cache stats would not be reported for docker, exec, and java drivers under Linux cgroups v2
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```
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