runc update: fix updating swap for cgroup v2 #4357
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rata
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Jul 23, 2024
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This mostly LGTM. Left some comments, mainly about tests.
On a quick look, it seems crun does the same: https://github.com/containers/crun/blob/main/src/libcrun/cgroup-resources.c#L711
Barakmor1
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Jul 25, 2024
rata
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Aug 22, 2024
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For ease of review, I've split this into two commits. |
rata
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Sep 13, 2024
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LGTM
@kolyshkin thanks for splitting in 2 commits, it makes it really straight-forward to review :)
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Improve readability of ConvertMemorySwapToCgroupV2Value by switching from a bunch of if statements to a switch, and adding a comment describing each case. No functional change. Signed-off-by: Kir Kolyshkin <[email protected]>
This allows to do
runc update $ID --memory=-1 --memory-swap=$VAL
for cgroup v2, i.e. set memory to unlimited and swap to a specific
value.
This was not possible because ConvertMemorySwapToCgroupV2Value rejected
memory=-1 ("unlimited"). In a hindsight, it was a mistake, because if
memory limit is unlimited, we should treat memory+swap limit as just swap
limit.
Revise the unit test; add description to each case.
Fixes: c86be8a ("cgroupv2: fix setting MemorySwap")
Signed-off-by: Kir Kolyshkin <[email protected]>
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@AkihiroSuda @lifubang this is a fix that did not made its way into v1.2.0. I would still like to merge it and then open a backport to release-1.2 branch. |
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This allows to do
for cgroup v2, i.e. set memory to unlimited and swap to a specific value.
This was not possible because ConvertMemorySwapToCgroupV2Value rejected memory=-1 ("unlimited"). In a hindsight, it was a mistake, because if memory limit is unlimited, we should treat memory+swap limit as just swap limit.
While at it, improve some comments in the code, and revise the unit test.
Fixes: c86be8a ("cgroupv2: fix setting MemorySwap") aka #2288