Commit 53516d4a authored Sep 21, 2020 by Srikar Dronamraju Committed by Michael Ellerman Oct 06, 2020

powerpc/smp: Limit CPUs traversed to within a node.



All the arch specific topology cpumasks are within a node/DIE.
However when setting these per CPU cpumasks, system traverses through
all the online CPUs. This is redundant.

Reduce the traversal to only CPUs that are online in the node to which
the CPU belongs to.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Tested-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200921095653.9701-6-srikar@linux.vnet.ibm.com

parent 70edd4a7

arch/powerpc/kernel/smp.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1241,7 +1241,7 @@ static bool update_mask_by_l2(int cpu, struct cpumask (mask_fn)(int))
		}

		cpumask_set_cpu(cpu, mask_fn(cpu));
		for_each_cpu(i, cpu_online_mask) {
		for_each_cpu_and(i, cpu_online_mask, cpu_cpu_mask(cpu)) {
		/*
		* when updating the marks the current CPU has not been marked
		* online, but we need to update the cache masks

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