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Introduce a new driver in virt named steal_governor. This driver
will compute the steal time and drive the policy decisions regarding the
preferred CPU state.
Note that this driver is strictly intended for actual guests. Hence
block it on Xen dom0.
More details can be found in Documentation/driver-api/steal-governor.rst.
A new kconfig called STEAL_GOVERNOR is introduced in subsequent patches,
which enables this driver. This driver will select CONFIG_PREFERRED_CPU.
This makes configs driven by user preference/configuration.
When the driver is disabled, preferred CPUs remain the same as active CPUs.
The file layout of the driver is kept simple for now. The code is in
drivers/virt/steal_governor.c, and the configs are part of
drivers/virt/Kconfig.
The main structure of the steal governor contains:
- work, delay: Deferred periodic work function variables.
- steal, time: Used to calculate deltas during periodic work.
- interval_ms, high_threshold, low_threshold: Tuning knobs for the
steal governor.
While there, add MAINTAINERS entry for this new driver.
Suggested-by: Yury Norov <yury.norov@gmail.com>
Suggested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260928053728.797539-11-sshegde@linux.ibm.com
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