Messages in this thread Patch in this message | | | From | Lukasz Luba <> | Subject | [PATCH v4 18/18] Documentation: EM: Update information about performance field | Date | Mon, 25 Sep 2023 09:11:39 +0100 |
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The Energy Model supports the new information: performance for each performance state. Update the needed documentation part accordingly.
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> --- Documentation/power/energy-model.rst | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/Documentation/power/energy-model.rst b/Documentation/power/energy-model.rst index 3115411f9839..da3619c0b98a 100644 --- a/Documentation/power/energy-model.rst +++ b/Documentation/power/energy-model.rst @@ -125,6 +125,11 @@ runtime static EM' (system property) design to a 'single EM which can be changed during runtime according e.g. to the workload' (system and workload property) design. +It is possible also to modify the CPU performance values for each EM's +performance state. Thus, the full power and performance profile (which +is an exponential curve) can be changed according e.g. to the workload +or system property. + 3. Core APIs ------------ @@ -326,18 +331,18 @@ EM framework:: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This section provides a simple example of a thermal driver modifying the EM. -The driver implements a foo_mod_power() function to be provided to the +The driver implements a mod_power_perf() function to be provided to the EM framework. The driver is woken up periodically to check the temperature and modify the EM data if needed:: -> drivers/thermal/foo_thermal.c - 01 static int foo_mod_power(struct device *dev, unsigned long freq, - 02 unsigned long *power, void *priv) + 01 static int mod_power_perf(struct device *dev, unsigned long freq, + 02 unsigned long *power, unsigned long *perf, void *priv) 03 { 04 struct foo_context *ctx = priv; 05 - 06 /* Estimate power for the given frequency and temperature */ + 06 *perf = foo_estimate_performance(dev, freq); 07 *power = foo_estimate_power(dev, freq, ctx->temperature); 08 if (*power >= EM_MAX_POWER); 09 return -EINVAL; -- 2.25.1
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