Does threadx support dynamic power off one or more cores in SMP system?

[carll00226]

HI, all: We are using threadx in a SMP * 4 system and we want to power off 1 , 2 or 3 cores when necessary, what need to do for threadx? I find the macro TX_THREAD_SMP_DYNAMIC_CORE_MAX, but it seems threadx do not change the value of _tx_thread_smp_max_cores, so what is it used for ?

[TiejunMS]

For ThreadX, you will need to exclude the cores for every thread by tx_thread_smp_core_exclude(). And also exclude those cores for timer by tx_timer_smp_core_exclude().

[carll00226]

Hi，TiejunMS: What's the meaning of "exclude those cores for timer by tx_thread_smp_core_get()"? tx_thread_smp_core_get just get the core id. Do you mean the tick timer? the core which start the tick timer will not be powered down until the cluster powered off.

[carll00226]

core0 start the tick timer and decide which cores should be power down at a certain time. Whether the other cores must be idle when core0 exclude these cores for every thread and then power them down ？ If core0 want to power down a core at any time, send a message to notify the core, and the core is executing a task at this time, how to save the context and exclude the task from this core ?

[TiejunMS]

Sorry about the typo. The API to exclude timer cores should be tx_timer_smp_core_exclude.

[TiejunMS]

Closing