sched: add arch_scale_min_freq_capacity to track minimum capacity caps

If the minimum capacity of a group is capped by userspace or internal dependencies which are not otherwise visible to the scheduler, we need a way to see these and integrate this information into the energy calculations and task placement decisions we make. Add arch_scale_min_freq_capacity to determine the lowest capacity which a specific cpu can provide under the current set of known constraints. Change-Id: Ied4a1dc0982bbf42cb5ea2f27201d4363db59705 Signed-off-by: Chris Redpath <[email protected]> Signed-off-by: Ionela Voinescu <[email protected]>
Diva-Room · Aug 23, 2023 · e6910e7 · e6910e7
1 parent ccd1494
commit e6910e7
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
@@ -2365,6 +2365,18 @@ unsigned long arch_scale_max_freq_capacity(struct sched_domain *sd, int cpu)
 }
 #endif
 
+#ifndef arch_scale_min_freq_capacity
+static __always_inline
+unsigned long arch_scale_min_freq_capacity(struct sched_domain *sd, int cpu)
+{
+	/*
+	 * Multiplied with any capacity value, this scale factor will return
+	 * 0, which represents an un-capped state
+	 */
+	return 0;
+}
+#endif
+
 #ifndef arch_scale_cpu_capacity
 static __always_inline
 unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)