config: simplify final CPU affinity rule #1261
Merged
+3
−2
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
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 <kolyshkin@gmail.com>
kolyshkin
requested review from
AkihiroSuda,
crosbymichael,
cyphar,
dqminh,
giuseppe,
hqhq,
mrunalp,
thaJeztah,
tianon and
utam0k
as code owners
|
@kad PTAL |
|
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. |
kolyshkin
added a commit
to kolyshkin/runc
that referenced
this pull request
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 <kolyshkin@gmail.com>
utam0k
approved these changes
Jul 19, 2024
tianon
approved these changes
Aug 7, 2024
kolyshkin
added a commit
to kolyshkin/runc
that referenced
this pull request
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 <kolyshkin@gmail.com>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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.