Commits on Apr 16, 2024

1. Set temporary single CPU affinity before cgroup cpuset transition. …

   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 <[email protected]>

   

   cclerget committed Apr 16, 2024
   Configuration menu

   • View commit details
   • Copy full SHA for afc23e3
   • Browse repository at this point

   Copy the full SHA

   afc23e3 View commit details

   Browse the repository at this point in the history