Re: [RFC PATCH v5 0/9] steal tasks to improve CPU utilization

[Peter Zijlstra]

On Fri, Mar 20, 2026 at 05:59:11AM +0000, Chen Jinghuang wrote:
> When a CPU has no more CFS tasks to run, and idle_balance() fails to
> find a task, then attempt to steal a task from an overloaded CPU in the
> same LLC. Maintain and use a bitmap of overloaded CPUs to efficiently
> identify candidates.  To minimize search time, steal the first migratable
> task that is found when the bitmap is traversed.  For fairness, search
> for migratable tasks on an overloaded CPU in order of next to run.

This makes no sense. It is the task of newidle to get more work -- if
that is failing for you, then we should fix that, not build a second way
to get tasks.