[Midnightbsd-cvs] [MidnightBSD/src] 4aa1fd: sched: remove unsafe MIC class repicks

[Lucas Holt]

  Branch: refs/heads/master
  Home:   https://github.com/MidnightBSD/src
  Commit: 4aa1fd4cd65f6be902228433ddec43e0668c4730
      https://github.com/MidnightBSD/src/commit/4aa1fd4cd65f6be902228433ddec43e0668c4730
  Author: Lucas Holt <luke at foolishgames.com>
  Date:   2026-06-13 (Sat, 13 Jun 2026)

  Changed paths:
    M sys/kern/sched_mic.c

  Log Message:
  -----------
  sched: remove unsafe MIC class repicks

Back out the MIC running-thread class repick path that could mark active threads for PICKCPU from the periodic balancer.  That path allowed duplicate current-thread residency during balancer stress.

Keep class-aware selection for newly queued threads, but leave running threads on their selected CPU unless their cpuset no longer allows it.  Also guard early topology/class helper use so boot-time scheduler paths do not dereference incomplete topology state.

Signed-off-by: Lucas Holt <luke at foolishgames.com>

AI-Assisted-by: GPT-5 Codex



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