[1.2] runc update: fix updating swap for cgroup v2 #4501
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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 <kolyshkin@gmail.com> (cherry picked from commit cb9f3d6) Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
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 <kolyshkin@gmail.com>
(cherry picked from commit 732806e)
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
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Cherry-pick (clean):