diff options
| author | Shrikanth Hegde <sshegde@linux.ibm.com> | 2026-09-28 11:07:28 +0530 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-09-28 08:44:44 +0200 |
| commit | 1fb28c664a19df8d45a6afa04d28d102b04ea680 (patch) | |
| tree | b96b4b3c9080ca5a98f0a71b5bb9529e4393a933 /drivers/virt/Kconfig | |
| parent | 27d47ebce4d6490ce093031a48cc2d81bf9997a3 (diff) | |
virt/steal_governor: Enable the driver
Provide a config option to enable the steal_governor driver.
Since the feature targets paravirtualized environments and requires SMP,
enforce those dependencies. The driver selects CONFIG_PREFERRED_CPU
for the core scheduler mechanisms to work.
It is recommended to build the driver as a module (m) instead of
built-in (y) due to the following reasons:
- Module parameters are read-only after initialization. Building as a
module allows updating these parameters by simply reloading the module.
Default module parameters cannot work in all configurations.
- The driver can be completely disabled by unloading the module.
- This feature works best when all VMs operate in a cooperative manner.
Requiring an explicit module load ensures intentional deployment
across all VMs by the system administrator.
Suggested-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260928053728.797539-14-sshegde@linux.ibm.com
Diffstat (limited to 'drivers/virt/Kconfig')
| -rw-r--r-- | drivers/virt/Kconfig | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/virt/Kconfig b/drivers/virt/Kconfig index 52eb7e4ba71f..eeb84e578ddf 100644 --- a/drivers/virt/Kconfig +++ b/drivers/virt/Kconfig @@ -41,6 +41,23 @@ config FSL_HV_MANAGER 4) A kernel interface for receiving callbacks when a managed partition shuts down. +config STEAL_GOVERNOR + tristate "Dynamic vCPU management based on steal time" + depends on PARAVIRT && SMP + select PREFERRED_CPU + default m + help + This driver helps to reduce the steal time in paravirtualized + environments, thereby reducing vCPU preemption costs. + + By default preferred CPUs will be same as active CPUs. Depending + on the steal time when steal_governor driver is enabled, + preferred CPUs could become subset of active CPUs. + More details are at: Documentation/driver-api/steal-governor.rst + + It is recommended to build it as module and load the module + to enable it. + source "drivers/virt/vboxguest/Kconfig" source "drivers/virt/nitro_enclaves/Kconfig" |