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Cédric Clerget
afc23e3397
This handles a corner case when joining a container having all the processes running exclusively on isolated CPU cores to force the kernel to schedule runc process on the first CPU core within the cgroups cpuset. The introduction of the kernel commit 46a87b3851f0d6eb05e6d83d5c5a30df0eca8f76 has affected this deterministic scheduling behavior by distributing tasks across CPU cores within the cgroups cpuset. Some intensive real-time application are relying on this deterministic behavior and use the first CPU core to run a slow thread while other CPU cores are fully used by real-time threads with SCHED_FIFO policy. Such applications prevents runc process from joining a container when the runc process is randomly scheduled on a CPU core owned by a real-time thread. Introduces isolated CPU affinity transition OCI runtime annotation org.opencontainers.runc.exec.isolated-cpu-affinity-transition to restore the behavior during runc exec. Fix issue with kernel >= 6.2 not resetting CPU affinity for container processes. Signed-off-by: Cédric Clerget <cedric.clerget@gmail.com>