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Provide the preferred CPU infrastructure. Define get/set macros which could be used to get/set CPU state as preferred. CONFIG_PREFERRED_CPU will be selected by the driver which handles steal time values. It is going to set/clear preferred CPU state. This driver will be called steal_governor and it is introduced in subsequent patches. It periodically computes the steal ratio and decides on preferred CPU state. A CPU is set to preferred when it becomes active. Later it may be marked as non-preferred depending on steal ratio by the steal_governor. Always maintain design construct of preferred is subset of active. i.e. preferred ⊆ active ⊆ online ⊆ present ⊆ possible With CONFIG_PREFERRED_CPU=n, ensure set_cpu_preferred is a nop and get method returns the active state in that case. Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/20260928053728.797539-5-sshegde@linux.ibm.com |
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