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2016-06-06sim: Only print the power state transition warning onceAndreas Sandberg
A lot of objects seem to request no-op power transitions which currently results in large amounts of warnings. These warnings are benign and risk hiding more serious warnings. Make the warning a warn_once to prevent console flooding. Change-Id: I86c74b4224b167f14469250ef86ab69fde7a227e Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
2016-06-06sim: Adding support for power modelsDavid Guillen Fandos
This patch adds some basic support for power models in gem5. The power interface is defined so it can interact with thermal models as well. It implements a simple power evaluator that can be used for simple power models that express power in the form of a math expression. These expressions can use stats within the same SimObject (or down its hierarchy) and some magic variables such as "temp" for temperature. In future patches we will extend this functionality to allow slightly more complex expressions. The model allows it to be extended to use other kinds of models. Change-Id: I76752f9638b6815e229fd74cdcb7721a305cbc4b
2016-06-06stats: Silence unused power statsAndreas Sandberg
The power stats are currently very noisy even if no power model has been loaded. Silence stats that are either zero or nan. Change-Id: I7d0220c2fcf01131084a219228f140cfaddaf95b Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
2016-06-06pwr: Add power states to ClockedObjectDavid Guillen Fandos
Add 4 power states to the ClockedObject, provides necessary access functions to check and update the power state. Default power state is UNDEFINED, it is responsibility of the respective simulation model to provide the startup state and any other logic for state change. Add number of transition stat. Add distribution of time spent in clock gated state. Add power state residency stat. Add dump call back function to allow stats update of distribution and residency stats. Change-Id: Id086090a2ed720c9fcb37812a3c98f0f724907c6
2016-04-07Revert to 74c1e6513bd0 (sim: Thermal support for Linux)Andreas Sandberg
2016-04-06Revert power patch sets with unexpected interactionsAndreas Sandberg
The following patches had unexpected interactions with the current upstream code and have been reverted for now: e07fd01651f3: power: Add support for power models 831c7f2f9e39: power: Low-power idle power state for idle CPUs 4f749e00b667: power: Add power states to ClockedObject Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> --HG-- extra : amend_source : 0b6fb073c6bbc24be533ec431eb51fbf1b269508
2016-04-05power: Add support for power modelsDavid Guillen Fandos
This patch adds some basic support for power models in gem5. The power interface is defined so it can interact with thermal models as well. It implements a simple power evaluator that can be used for simple power models that express power in the form of a math expression. These expressions can use stats within the same SimObject (or down its hierarchy) and some magic variables such as "temp" for temperature. In future patches we will extend this functionality to allow slightly more complex expressions. The model allows it to be extended to use other kinds of models. Finally, the thermal model is updated to use the power usage as input.
2014-11-18power: Add power states to ClockedObjectAkash Bagdia
Add 4 power states to the ClockedObject, provides necessary access functions to check and update the power state. Default power state is UNDEFINED, it is responsibility of the respective simulation model to provide the startup state and any other logic for state change. Add number of transition stat. Add distribution of time spent in clock gated state. Add power state residency stat. Add dump call back function to allow stats update of distribution and residency stats.