sched/cache: Fix checking active load balance by only considering the CFS task

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The currently running task cur may not be a CFS task, such as
an RT or Deadline task. For non-CFS tasks, the task_util(cur)
utilization average is not maintained, so this might pass a
stale or meaningless value to can_migrate_llc().

Check if the task is CFS before getting its task_util().

This bug was reported by sashiko.

Fixes: 714059f79f ("sched/cache: Handle moving single tasks to/from their preferred LLC")
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/f9161133cf040d286dca11344a112c5ef2a5253d.1778703694.git.tim.c.chen@linux.intel.com

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Chen Yu 2026-05-13 13:39:22 -07:00 • committed by Peter Zijlstra

parent 03755348b8

commit d6b9afab44

1 changed files with 3 additions and 2 deletions

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kernel/sched/fair.c

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