Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Refactor select_cpu + enqueue for proper synchronization and handle of !wakeup #438

Open
wants to merge 3 commits into
base: main
Choose a base branch
from
Open

Refactor select_cpu + enqueue for proper synchronization and handle of !wakeup #438

wants to merge 3 commits into from

Commits on Jul 17, 2024

  1. scx_mitosis: Automated reformatting 

    Missed this in some previous commits. Just running clang-format.

Signed-off-by: Dan Schatzberg <[email protected]>
    @dschatzberg
    dschatzberg committed Jul 17, 2024
    Configuration menu
    Copy the full SHA
    147e877 View commit details
    Browse the repository at this point in the history

  2. scx_mitosis: handle enqueue() on !wakeup 

    If we're not on the wakeup path, we may see enqueue() invoked without
select_cpu() which will require an idle cpu lookup. In order to fix
this, we refactor the idle_cpu lookup in select_cpu so it can be invoked
from enqueue().

Signed-off-by: Dan Schatzberg <[email protected]>
    @dschatzberg
    dschatzberg committed Jul 17, 2024
    Configuration menu
    Copy the full SHA
    8db7af6 View commit details
    Browse the repository at this point in the history

  3. scx_mitosis: add RCU-like synchronization 

    scx_mitosis relied on the implicit assumption that after a sched tick,
all outstanding scheduling events had completed but this might not
actually be correct. This feels like a natural use-case for RCU, but
there is no way to directly make use of RCU in BPF. Instead, this commit
implements an RCU-like synchronization mechanism.

Signed-off-by: Dan Schatzberg <[email protected]>
    @dschatzberg
    dschatzberg committed Jul 17, 2024
    Configuration menu
    Copy the full SHA
    9ab7689 View commit details
    Browse the repository at this point in the history