Re: [PATCH] sched: fix priority leakage in pick_next_highest_task_rt()
From: Hillf Danton
Date: Tue May 17 2011 - 10:53:28 EST
On Tue, May 17, 2011 at 10:28 AM, Yong Zhang <yong.zhang0@xxxxxxxxx> wrote:
> On Mon, May 16, 2011 at 8:55 PM, Hillf Danton <dhillf@xxxxxxxxx> wrote:
>> When picking the second highest RT task for a given runqueue, if no
>> task found after scanning the queue of priority == idx, the next idx
>> should also be checked even in case that next is already existing, or
>> the window of priority leakage could be opened.
> I don't see what kind of problem you patch will fix.
> And mind explaining how priority leakage could happen?
If no task is found after scanning the list at array->queue + idx,
what should we operate on next?
And why is the list scanned?
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