s390/numa: pin all possible cpus to nodes early (e6d4a636) · Commits · 戴 / test

It is required to have an early static cpu to node mapping. This patch pins all possible cpus to nodes for which no topology information is present. Since there is no interface available which would allow to tell where a non-present cpu would appear topology-wise, simply use a round robin algorithm. Right now this makes sure that the cpu_to_node() function will return the same value for a cpu during the life time of the system. Acked-by:

Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by:

Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:

Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/numa/mode_emu.c

+22 −1

Original line number	Diff line number	Diff line
		@@ -424,6 +424,27 @@ static void print_node_to_core_map(void)
		}
		}

		static void pin_all_possible_cpus(void)
		{
		int core_id, node_id, cpu;
		static int initialized;

		if (initialized)
		return;
		print_node_to_core_map();
		node_id = 0;
		for_each_possible_cpu(cpu) {
		core_id = smp_get_base_cpu(cpu);
		if (emu_cores->to_node_id[core_id] != NODE_ID_FREE)
		continue;
		pin_core_to_node(core_id, node_id);
		cpu_topology[cpu].node_id = node_id;
		node_id = (node_id + 1) % emu_nodes;
		}
		print_node_to_core_map();
		initialized = 1;
		}

		/*
		* Transfer physical topology into a NUMA topology and modify CPU masks
		* according to the NUMA topology.
		@@ -441,7 +462,7 @@ static void emu_update_cpu_topology(void)
		toptree_free(phys);
		toptree_to_topology(numa);
		toptree_free(numa);
		print_node_to_core_map();
		pin_all_possible_cpus();
		}

		/*

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