config: simplify final CPU affinity rule #1261
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Description of execCPUAffinity.final said that if it's not set or empty, the final affinity is the one of container's cgroup. This was done because we thought the kernel changes process' CPU affinity to one of cgroup. It's not the case. To keep the runtime simple, it makes sense to not do anything if the final affinity is not explicitly set. This change does just that. Signed-off-by: Kir Kolyshkin <[email protected]>
kolyshkin
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AkihiroSuda,
crosbymichael,
cyphar,
dqminh,
giuseppe,
hqhq,
mrunalp,
thaJeztah,
tianon and
utam0k
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@kad PTAL |
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I'm fine with new wording. However, in overall, I'd prefer to have that field to be not only for exec, but for all stages of container lifecycle, as we have ideas on how it might be useful in some corner case scenarios even for pid 1 of container... But that's another story :) |
We can rename it to "CPUAffinity" and apply to both exec and init. Feel free to open a PR. |
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Jul 17, 2024
As per - opencontainers/runtime-spec#1253 - opencontainers/runtime-spec#1261 Add some tests (alas it's impossible to test initial CPU affinity without adding debug logging). Signed-off-by: Kir Kolyshkin <[email protected]>
utam0k
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tianon
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Aug 7, 2024
kolyshkin
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Aug 16, 2024
As per - opencontainers/runtime-spec#1253 - opencontainers/runtime-spec#1261 Add some tests (alas it's impossible to test initial CPU affinity without adding debug logging). Signed-off-by: Kir Kolyshkin <[email protected]>
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Description of
execCPUAffinity.finalfield (added in #1253) said that if it's not set or empty, the final affinity is the one of container's cgroup. This was done because we thought the kernel changes process' CPU affinity to one of cgroup. It's not the case (see here).To keep runtimes simple, it makes sense to not do anything if the final affinity is not explicitly set. This change does just that.