Support cgroups v1 and v2 for memory limits #1286
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colincasey
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Jun 27, 2024
dzuelke
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Uses memory.high if available (recommended way of setting a functioning soft limit), then first falls back to memory.max (e.g. from 'docker run -m'), then to memory.low (e.g. from 'docker run --memory-reservation'), and finally to memory.min. Falls back to direct reading of '/sys/fs/cgroup/memory/memory.limit_in_bytes' for cases where that exists, but no full cgroupfs is mounted (e.g. on Heroku). Limit enforcement (now to 8 TB) is still in place this way - a Docker v1 value will be read, and run into the limit for unrestricted containers, without hitting the fallback and getting returned. GUS-W-16052317
From https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idcontainer: > Note: The default shell for run steps inside a container is sh instead of bash. This can be overridden with jobs.<job_id>.defaults.run or jobs.<job_id>.steps[*].shell.
colincasey
reviewed
Jul 2, 2024
| fi | ||
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| dne_memory() { |
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what does dne stand for?
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| if (($? == 99)); then |
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a brief comment about exit code 99 would be nice
colincasey
reviewed
Jul 2, 2024
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@dzuelke this file contains all the "shared" logic between buildpacks, right? if changes occur will we be manually keeping these in sync? is the PHP version the canonical one since it contains most of the underlying tests?
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Closing this as unplanned for now. |
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For v2, it uses
memory.highif available (recommended way of setting a functioning soft limit), then first falls back tomemory.max(e.g. fromdocker run -m), then tomemory.low(e.g. fromdocker run --memory-reservation), and finally tomemory.min.Falls back to direct reading of
/sys/fs/cgroup/memory/memory.limit_in_bytesfor cases where that exists, but no full cgroupfs is mounted (e.g. on Heroku).Limit enforcement (now to 8 TB) is still in place this way - a Docker v1 value will be read, and run into the limit for unrestricted containers, without hitting the fallback and getting returned.
GUS-W-16052317