[1.1] libct/cg/fs2: use file + anon + swap for usage
#3977
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@AkihiroSuda I know you had hesitation on the other PR, but I think the differences qualify as a bug and that justifies including it in 1.1 (especially so kubernetes can vendor it before 1.2 is released) |
kolyshkin
approved these changes
Aug 9, 2023
mrunalp
approved these changes
Aug 9, 2023
AkihiroSuda
approved these changes
Aug 9, 2023
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Let's merge it after #3976 so we can run CI on go 1.21. |
This aligns v2 usage calculations more closely with v1. Current node-level reporting for v1 vs v2 on the same machine under similar load may differ by ~250-750Mi. Also return usage as combined swap + memory usage, aligned with v1 and non-root v2 cgroups. `mem_cgroup_usage` in the kernel counts NR_FILE_PAGES + NR_ANON_MAPPED + `nr_swap_pages` (if swap enabled) [^0]. Using total - free results in higher "usage" numbers. This is likely due to various types of reclaimable memory technically counted as in use (e.g. inactive anon). See also kubernetes/kubernetes#118916 for more context [^0]: https://github.com/torvalds/linux/blob/06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5/mm/memcontrol.c#L3673-L3680 Signed-off-by: Alexander Eldeib <alexeldeib@gmail.com>
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Rebased on top of #3976 to check against updated CI. |
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Backport of #3933 by @alexeldeib to release-1.1 branch. Original description follows.
This aligns v2 usage calculations more closely with v1. Current node-level reporting for v1 vs v2 on the same machine under similar load may differ by ~250-750Mi.
Also return usage as combined swap + memory usage, aligned with v1 and non-root v2 cgroups.
mem_cgroup_usagein the kernel counts NR_FILE_PAGESnr_swap_pages(if swap enabled) 1.Using total - free results in higher "usage" numbers. This is likely due to various types of reclaimable memory technically counted as in use (e.g. inactive anon).
See also kubernetes/kubernetes#118916 for more context
Footnotes
https://github.com/torvalds/linux/blob/06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5/mm/memcontrol.c#L3673-L3680 ↩