mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2c6e6db41f
This attached patch significantly shrinks boot memory allocation on ia64. It does this by not allocating per_cpu areas for cpus that can never exist. In the case where acpi does not have any numa node description of the cpus, I defaulted to assigning the first 32 round-robin on the known nodes.. For the !CONFIG_ACPI I used for_each_possible_cpu(). Signed-off-by: Robin Holt <holt@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ia64 kernel NUMA specific stuff
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*
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* Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
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* Copyright (C) 2004 Silicon Graphics, Inc.
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* Jesse Barnes <jbarnes@sgi.com>
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*/
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#include <linux/topology.h>
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#include <linux/module.h>
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#include <asm/processor.h>
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#include <asm/smp.h>
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u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
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EXPORT_SYMBOL(cpu_to_node_map);
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cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
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EXPORT_SYMBOL(node_to_cpu_mask);
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void __cpuinit map_cpu_to_node(int cpu, int nid)
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{
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int oldnid;
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if (nid < 0) { /* just initialize by zero */
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cpu_to_node_map[cpu] = 0;
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return;
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}
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/* sanity check first */
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oldnid = cpu_to_node_map[cpu];
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if (cpu_isset(cpu, node_to_cpu_mask[oldnid])) {
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return; /* nothing to do */
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}
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/* we don't have cpu-driven node hot add yet...
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In usual case, node is created from SRAT at boot time. */
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if (!node_online(nid))
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nid = first_online_node;
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cpu_to_node_map[cpu] = nid;
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cpu_set(cpu, node_to_cpu_mask[nid]);
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return;
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}
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void __cpuinit unmap_cpu_from_node(int cpu, int nid)
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{
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WARN_ON(!cpu_isset(cpu, node_to_cpu_mask[nid]));
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WARN_ON(cpu_to_node_map[cpu] != nid);
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cpu_to_node_map[cpu] = 0;
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cpu_clear(cpu, node_to_cpu_mask[nid]);
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}
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/**
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* build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
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*
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* Build cpu to node mapping and initialize the per node cpu masks using
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* info from the node_cpuid array handed to us by ACPI.
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*/
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void __init build_cpu_to_node_map(void)
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{
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int cpu, i, node;
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for(node=0; node < MAX_NUMNODES; node++)
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cpus_clear(node_to_cpu_mask[node]);
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for_each_possible_early_cpu(cpu) {
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node = -1;
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for (i = 0; i < NR_CPUS; ++i)
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if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) {
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node = node_cpuid[i].nid;
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break;
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}
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map_cpu_to_node(cpu, node);
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}
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}
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