Messages in this thread Patch in this message | | | Date | Fri, 22 Sep 2006 17:07:43 -0700 | From | Andrew Morton <> | Subject | Re: [BUGFIX][PATCH] cpu to node relationship fixup take2 [1/2] acpi_map_cpu2node |
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On Fri, 22 Sep 2006 17:06:04 -0700 Andrew Morton <akpm@osdl.org> wrote:
> cpu-to-node-relationship-fixup-map-cpu-to-node.patch
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Assume that a cpu is *physically* offlined at boot time...
Because smpboot.c::smp_boot_cpu_map() canoot find cpu's sapicid, numa.c::build_cpu_to_node_map() cannot build cpu<->node map for offlined cpu.
For such cpus, cpu_to_node map should be fixed at cpu-hot-add. This mapping should be done before cpu onlining.
This patch also handles cpu hotremove case.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> ---
arch/ia64/kernel/numa.c | 34 +++++++++++++++++++++++++++++++--- arch/ia64/kernel/topology.c | 6 +++++- include/asm-ia64/numa.h | 4 ++++ 3 files changed, 40 insertions(+), 4 deletions(-)
diff -puN arch/ia64/kernel/numa.c~cpu-to-node-relationship-fixup-map-cpu-to-node arch/ia64/kernel/numa.c --- a/arch/ia64/kernel/numa.c~cpu-to-node-relationship-fixup-map-cpu-to-node +++ a/arch/ia64/kernel/numa.c @@ -29,6 +29,36 @@ EXPORT_SYMBOL(cpu_to_node_map); cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; +void __cpuinit map_cpu_to_node(int cpu, int nid) +{ + int oldnid; + if (nid < 0) { /* just initialize by zero */ + cpu_to_node_map[cpu] = 0; + return; + } + /* sanity check first */ + oldnid = cpu_to_node_map[cpu]; + if (cpu_isset(cpu, node_to_cpu_mask[oldnid])) { + return; /* nothing to do */ + } + /* we don't have cpu-driven node hot add yet... + In usual case, node is created from SRAT at boot time. */ + if (!node_online(nid)) + nid = first_online_node; + cpu_to_node_map[cpu] = nid; + cpu_set(cpu, node_to_cpu_mask[nid]); + return; +} + +void __cpuinit unmap_cpu_from_node(int cpu, int nid) +{ + WARN_ON(!cpu_isset(cpu, node_to_cpu_mask[nid])); + WARN_ON(cpu_to_node_map[cpu] != nid); + cpu_to_node_map[cpu] = 0; + cpu_clear(cpu, node_to_cpu_mask[nid]); +} + + /** * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays * @@ -49,8 +79,6 @@ void __init build_cpu_to_node_map(void) node = node_cpuid[i].nid; break; } - cpu_to_node_map[cpu] = (node >= 0) ? node : 0; - if (node >= 0) - cpu_set(cpu, node_to_cpu_mask[node]); + map_cpu_to_node(cpu, node); } } diff -puN arch/ia64/kernel/topology.c~cpu-to-node-relationship-fixup-map-cpu-to-node arch/ia64/kernel/topology.c --- a/arch/ia64/kernel/topology.c~cpu-to-node-relationship-fixup-map-cpu-to-node +++ a/arch/ia64/kernel/topology.c @@ -36,6 +36,9 @@ int arch_register_cpu(int num) */ if (!can_cpei_retarget() && is_cpu_cpei_target(num)) sysfs_cpus[num].cpu.no_control = 1; +#ifdef CONFIG_NUMA + map_cpu_to_node(num, node_cpuid[num].nid); +#endif #endif return register_cpu(&sysfs_cpus[num].cpu, num); @@ -45,7 +48,8 @@ int arch_register_cpu(int num) void arch_unregister_cpu(int num) { - return unregister_cpu(&sysfs_cpus[num].cpu); + unregister_cpu(&sysfs_cpus[num].cpu); + unmap_cpu_from_node(num, cpu_to_node(num)); } EXPORT_SYMBOL(arch_register_cpu); EXPORT_SYMBOL(arch_unregister_cpu); diff -puN include/asm-ia64/numa.h~cpu-to-node-relationship-fixup-map-cpu-to-node include/asm-ia64/numa.h --- a/include/asm-ia64/numa.h~cpu-to-node-relationship-fixup-map-cpu-to-node +++ a/include/asm-ia64/numa.h @@ -64,6 +64,10 @@ extern int paddr_to_nid(unsigned long pa #define local_nodeid (cpu_to_node_map[smp_processor_id()]) +extern void map_cpu_to_node(int cpu, int nid); +extern void unmap_cpu_from_node(int cpu, int nid); + + #else /* !CONFIG_NUMA */ #define paddr_to_nid(addr) 0 _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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