Commit 9960be72 authored by Andrea Righi's avatar Andrea Righi Committed by Tejun Heo
Browse files

sched_ext: idle: Skip cross-node search with !CONFIG_NUMA 



In the idle CPU selection logic, attempting cross-node searches adds
unnecessary complexity when CONFIG_NUMA is disabled.

Since there's no meaningful concept of nodes in this case, simplify the
logic by restricting the idle CPU search to the current node only.

Fixes: 48849271 ("sched_ext: idle: Per-node idle cpumasks")
Signed-off-by: default avatarAndrea Righi <arighi@nvidia.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent ee9a4e92

kernel/sched/ext_idle.c

+8 −0
Original line number Diff line number Diff line
@@ -138,6 +138,7 @@ static s32 pick_idle_cpu_in_node(const struct cpumask *cpus_allowed, int node, u 
		goto retry;

}



#ifdef CONFIG_NUMA

/*

 * Tracks nodes that have not yet been visited when searching for an idle

 * CPU across all available nodes.
@@ -186,6 +187,13 @@ static s32 pick_idle_cpu_from_online_nodes(const struct cpumask *cpus_allowed, i 


	return cpu;

}

#else

static inline s32

pick_idle_cpu_from_online_nodes(const struct cpumask *cpus_allowed, int node, u64 flags)

{

	return -EBUSY;

}

#endif



/*

 * Find an idle CPU in the system, starting from @node.