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    SubjectRe: [patch] 2.4.21-pre5 correct scheduling of idle tasks [ all arch ]
    Date
    On Thu, 27 Mar 2003 16:54:47 +0100, 
    mikpe@csd.uu.se wrote:
    >Keith Owens writes:
    > > There are several inconsistencies in the scheduling of idle tasks and,
    > > for UP, tracking which task is on the cpu. This patch standardizes
    > > idle task scheduling across all architectures and corrects the UP
    > > error, it is just a bug fix.
    >...
    > > To make it worse, on UP a task is assigned to a cpu but never released.
    > > Very quickly, all tasks are marked as currently running on cpu 0 :(.
    >
    >->cpus_runnable and task_has_cpu() are SMP-only, as a quick grep
    >through 2.4.20 will tell you. There is no UP bug here to fix.

    cpus_runnable has task_has_cpu are not guarded by CONFIG_SMP.
    task_set_cpu() is called for UP as well as SMP. UP is missing the
    corresponding call to task_release_cpu().

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