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mm, memory_hotplug: provide a more generic restrictions for memory hotplug

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arch_add_memory, __add_pages take a want_memblock which controls whether
the newly added memory should get the sysfs memblock user API (e.g.
ZONE_DEVICE users do not want/need this interface).  Some callers even
want to control where do we allocate the memmap from by configuring
altmap.

Add a more generic hotplug context for arch_add_memory and __add_pages.
struct mhp_restrictions contains flags which contains additional features
to be enabled by the memory hotplug (MHP_MEMBLOCK_API currently) and
altmap for alternative memmap allocator.

This patch shouldn't introduce any functional change.

[akpm@linux-foundation.org: build fix]
Link: http://lkml.kernel.org/r/20190408082633.2864-3-osalvador@suse.de
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2019-05-13 17:21:26 -07:00 • committed by Linus Torvalds
parent 5557c766ab
commit 940519f0c8
10 changed files with 63 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

31
include/linux/memory_hotplug.h
View file

@ -53,6 +53,16 @@ enum {
MMOP_ONLINE_MOVABLE,
};
/*
* Restrictions for the memory hotplug:
* flags: MHP_ flags
* altmap: alternative allocator for memmap array
*/
struct mhp_restrictions {
unsigned long flags;
struct vmem_altmap *altmap;
};
/*
* Zone resizing functions
*
@ -101,6 +111,8 @@ extern void __online_page_free(struct page *page);
extern int try_online_node(int nid);
extern int arch_add_memory(int nid, u64 start, u64 size,
struct mhp_restrictions *restrictions);
extern u64 max_mem_size;
extern bool memhp_auto_online;
@ -118,20 +130,27 @@ extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap);
#endif /* CONFIG_MEMORY_HOTREMOVE */
/*
* Do we want sysfs memblock files created. This will allow userspace to online
* and offline memory explicitly. Lack of this bit means that the caller has to
* call move_pfn_range_to_zone to finish the initialization.
*/
#define MHP_MEMBLOCK_API (1<<0)
/* reasonably generic interface to expand the physical pages */
extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
struct vmem_altmap *altmap, bool want_memblock);
struct mhp_restrictions *restrictions);
#ifndef CONFIG_ARCH_HAS_ADD_PAGES
static inline int add_pages(int nid, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap,
bool want_memblock)
unsigned long nr_pages, struct mhp_restrictions *restrictions)
{
return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
#else /* ARCH_HAS_ADD_PAGES */
int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
struct vmem_altmap *altmap, bool want_memblock);
struct mhp_restrictions *restrictions);
#endif /* ARCH_HAS_ADD_PAGES */
#ifdef CONFIG_NUMA
@ -332,8 +351,6 @@ extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
extern int __add_memory(int nid, u64 start, u64 size);
extern int add_memory(int nid, u64 start, u64 size);
extern int add_memory_resource(int nid, struct resource *resource);
extern int arch_add_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap, bool want_memblock);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap);
extern bool is_memblock_offlined(struct memory_block *mem);