[patch-axel-86a] handle timer and ticks properly #124
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Signed-off-by: Axel Heider <axelheider@gmx.de>
Signed-off-by: Axel Heider <axelheider@gmx.de>
Signed-off-by: Axel Heider <axelheider@gmx.de>
Signed-off-by: Axel Heider <axelheider@gmx.de>
Signed-off-by: Axel Heider <axelheider@gmx.de>
Signed-off-by: Indan Zupancic <Indan.Zupancic@mep-info.com>
commitTime() assumes the SC has MIN_BUDGET left, which may not be true for IPIs. Call chargeBudget() instead, which does almost the same. Signed-off-by: Indan Zupancic <Indan.Zupancic@mep-info.com>
The intention of the MCS design is that updateTimestamp is performed as early in the kernel operation instruction stream as possible. Acquiring the lock can take approximately WCET time. For timer interrupts this is needed to prevent periodic tasks that run out of budget being postponed by low priority tasks, effectively increasing their period with the average lock take time. This will cause periodic tasks to drift in regard to the system clock and each other, making the system less deterministic. See also seL4 issue seL4#844. Signed-off-by: Indan Zupancic <Indan.Zupancic@mep-info.com>
Signed-off-by: Axel Heider <axelheider@gmx.de>
Signed-off-by: Axel Heider <axelheider@gmx.de>
Signed-off-by: Axel Heider <axelheider@gmx.de>
Signed-off-by: Axel Heider <axelheider@gmx.de>
This is a convenience function. ToDo: having this function seem not really a good idea
Signed-off-by: Axel Heider <axelheider@gmx.de>
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