Messages in this thread | | | Date | Mon, 21 Aug 2006 18:18:30 +0530 | From | Srivatsa Vaddagiri <> | Subject | Re: [PATCH 0/7] CPU controller - V1 |
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On Mon, Aug 21, 2006 at 10:42:40AM +0000, Mike Galbraith wrote: > WRT interactivity: Looking at try_to_wake_up(), it appears that wake-up > of a high priority group-a task will not result in preemption of a lower > priority current group-b task. True?
I dont think it is true. The definition of TASK_PREEMPTS_CURR() is unchanged with these patches. Also group priority is linked to the highest priority task it has. As a result, the high-priority group-a task should preempt the low priority group-b task.
This is unless group-a has currently run out of its bandwidth and is sitting in the expired queue (which is something that the TASK_PREEMPTS_CURR() can be optimized to check for).
-- Regards, vatsa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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