Commits on Nov 8, 2024

1. seize: enable support for frozen containers …

   Container runtimes like CRI-O and containerd utilize the freezer cgroup
   to create a consistent snapshot of container root filesystem (rootfs)
   changes. In this case, the container is frozen before invoking CRIU.
   After CRIU successfully completes, a copy of the container rootfs diff
   is saved, and the container is then unfrozen.
   
   However, the `cuda-checkpoint` tool is not able to perform a 'lock'
   action on frozen threads.  To support GPU checkpointing with these
   container runtimes, we need to unfreeze the cgroup and return it to its
   original state once the checkpointing is complete.
   
   To reflect this new behavior, the following changes are applied:
    - `dont_use_freeze_cgroup(void)` -> `set_compel_interrupt_only_mode(void)`
    - `bool freeze_cgroup_disabled` -> `bool compel_interrupt_only_mode`
    - `check_freezer_cgroup(void)` -> `prepare_freezer_for_interrupt_only_mode(void)`
   
   Note that when `compel_interrupt_only_mode` is set to `true`,
   `compel_interrupt_task()` is used instead of `freeze_processes()`
   to prevent tasks from running during `criu dump`.
   
   Fixes: checkpoint-restore#2508
   
   Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

   

   rst0git committed Nov 8, 2024
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2. ci: test interrupt-only mode with frozen cgroup …

   Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

   

   rst0git committed Nov 8, 2024
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