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scx_rustland_core: small core design improvements #568

Merged
merged 4 commits into from
Aug 26, 2024
Merged

scx_rustland_core: small core design improvements #568

merged 4 commits into from
Aug 26, 2024

Commits on Aug 26, 2024

  1. scx_rustland_core: temporarily drop RL_PREEMPT_CPU 

    Temporarily drop the RL_PREEMPT_CPU flag, we need a better way to
implement preemption in scx_rustland_core and it's not very effective at
the moment, so simply it drop it for now (it'll be re-added later in the
future in a proper way).

This change does not affect any scheduler, since RL_PREEMPT_CPU is
currently unused.

Signed-off-by: Andrea Righi <[email protected]>
    @arighi
    arighi committed Aug 26, 2024
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  2. scx_rustland_core: allow to propagate vtime to BPF 

    Introduce a vtime attribute to struct DispatchedTask that can be set by
the user-space scheduler and it'll be use by the BPF component to
dispatch the task via scx_bpf_dispatch_vtime().

In this way a user-space scheduler can decide to apply its own internal
task ordering or rely on the BPF vtime priority DSQs (or both).

Signed-off-by: Andrea Righi <[email protected]>
    @arighi
    arighi committed Aug 26, 2024
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  3. scx_rlfifo: enhance code design 

    Refactor the code design to make it more suitable as a template for
implementing advanced scheduling policies.

In particular, create separate loops for task consumption and task
dispatching. This will make the scheduler easier to adapt as a
foundation for implementing more complex scheduling policies.

Signed-off-by: Andrea Righi <[email protected]>
    @arighi
    arighi committed Aug 26, 2024
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  4. scx_rustland_core: update README.md with a FIFO example 

    Include the FIFO example directly in the README.md, instead of linking
scx_rlfifo.

Including the example directly in the README can be more useful and
practical in those cases where internet access is not available or when
we need to distribute a more "standalone" documentation.

Signed-off-by: Andrea Righi <[email protected]>
    @arighi
    arighi committed Aug 26, 2024
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