Messages in this thread | | | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable | From | Robert Love <> | Date | 08 Jan 2002 19:43:25 -0500 |
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On Tue, 2002-01-08 at 19:29, John Alvord wrote:
> The best part about planned preemption points is that there is minimal > state to save when an interruption occurs.
Actually, both preempt-kernel and low-latency do about the same amount of work re saving state.
With preempt-kernel, when a task is preempted in-kernel we AND a flag value into the preempt count. That is all we need to keep track of things.
With low-latency, the task state is set to TASK_RUNNING (which is a precautionary measure). So it is about the same, although low-latency (and lock-break) often also have to do various setup with the locks and all.
Robert Love
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