mm/migrate: add CPU hotplug to demotion #ifdef
Once upon a time, the node demotion updates were driven solely by memory
hotplug events. But now, there are handlers for both CPU and memory
hotplug.
However, the #ifdef around the code checks only memory hotplug. A
system that has HOTPLUG_CPU=y but MEMORY_HOTPLUG=n would miss CPU
hotplug events.
Update the #ifdef around the common code. Add memory and CPU-specific
#ifdefs for their handlers. These memory/CPU #ifdefs avoid unused
function warnings when their Kconfig option is off.
[arnd@arndb.de: rework hotplug_memory_notifier() stub]
Link: https://lkml.kernel.org/r/20211013144029.2154629-1-arnd@kernel.org
Link: https://lkml.kernel.org/r/20210924161255.E5FE8F7E@davehans-spike.ostc.intel.com
Fixes: 884a6e5d1f
("mm/migrate: update node demotion order on hotplug events")
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Родитель
295be91f7e
Коммит
76af6a054d
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@ -160,7 +160,10 @@ int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func,
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#define register_hotmemory_notifier(nb) register_memory_notifier(nb)
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#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
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#else
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#define hotplug_memory_notifier(fn, pri) ({ 0; })
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static inline int hotplug_memory_notifier(notifier_fn_t fn, int pri)
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{
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return 0;
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}
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/* These aren't inline functions due to a GCC bug. */
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#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
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#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
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42
mm/migrate.c
42
mm/migrate.c
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@ -3066,7 +3066,7 @@ void migrate_vma_finalize(struct migrate_vma *migrate)
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EXPORT_SYMBOL(migrate_vma_finalize);
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#endif /* CONFIG_DEVICE_PRIVATE */
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#if defined(CONFIG_MEMORY_HOTPLUG)
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#if defined(CONFIG_HOTPLUG_CPU)
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/* Disable reclaim-based migration. */
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static void __disable_all_migrate_targets(void)
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{
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@ -3208,25 +3208,6 @@ static void set_migration_target_nodes(void)
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put_online_mems();
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}
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/*
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* React to hotplug events that might affect the migration targets
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* like events that online or offline NUMA nodes.
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*
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* The ordering is also currently dependent on which nodes have
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* CPUs. That means we need CPU on/offline notification too.
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*/
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static int migration_online_cpu(unsigned int cpu)
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{
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set_migration_target_nodes();
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return 0;
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}
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static int migration_offline_cpu(unsigned int cpu)
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{
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set_migration_target_nodes();
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return 0;
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}
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/*
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* This leaves migrate-on-reclaim transiently disabled between
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* the MEM_GOING_OFFLINE and MEM_OFFLINE events. This runs
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@ -3284,6 +3265,25 @@ static int __meminit migrate_on_reclaim_callback(struct notifier_block *self,
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return notifier_from_errno(0);
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}
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/*
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* React to hotplug events that might affect the migration targets
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* like events that online or offline NUMA nodes.
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*
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* The ordering is also currently dependent on which nodes have
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* CPUs. That means we need CPU on/offline notification too.
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*/
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static int migration_online_cpu(unsigned int cpu)
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{
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set_migration_target_nodes();
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return 0;
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}
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static int migration_offline_cpu(unsigned int cpu)
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{
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set_migration_target_nodes();
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return 0;
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}
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static int __init migrate_on_reclaim_init(void)
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{
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int ret;
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@ -3303,4 +3303,4 @@ static int __init migrate_on_reclaim_init(void)
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return 0;
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}
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late_initcall(migrate_on_reclaim_init);
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#endif /* CONFIG_MEMORY_HOTPLUG */
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#endif /* CONFIG_HOTPLUG_CPU */
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@ -269,7 +269,7 @@ static int __meminit init_section_page_ext(unsigned long pfn, int nid)
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total_usage += table_size;
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return 0;
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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static void free_page_ext(void *addr)
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{
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if (is_vmalloc_addr(addr)) {
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@ -374,8 +374,6 @@ static int __meminit page_ext_callback(struct notifier_block *self,
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return notifier_from_errno(ret);
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}
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#endif
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void __init page_ext_init(void)
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{
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unsigned long pfn;
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@ -1095,7 +1095,7 @@ static int slab_offline_cpu(unsigned int cpu)
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return 0;
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}
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#if defined(CONFIG_NUMA) && defined(CONFIG_MEMORY_HOTPLUG)
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#if defined(CONFIG_NUMA)
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/*
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* Drains freelist for a node on each slab cache, used for memory hot-remove.
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* Returns -EBUSY if all objects cannot be drained so that the node is not
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@ -1157,7 +1157,7 @@ static int __meminit slab_memory_callback(struct notifier_block *self,
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out:
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return notifier_from_errno(ret);
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}
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#endif /* CONFIG_NUMA && CONFIG_MEMORY_HOTPLUG */
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#endif /* CONFIG_NUMA */
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/*
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* swap the static kmem_cache_node with kmalloced memory
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