forked from luck/tmp_suning_uos_patched
5c755e9fd8
Memory may be hot-removed on a per-memory-block basis, particularly on POWER where the SPARSEMEM section size often matches the memory-block size. A user-level agent must be able to identify which sections of memory are likely to be removable before attempting the potentially expensive operation. This patch adds a file called "removable" to the memory directory in sysfs to help such an agent. In this patch, a memory block is considered removable if; o It contains only MOVABLE pageblocks o It contains only pageblocks with free pages regardless of pageblock type On the other hand, a memory block starting with a PageReserved() page will never be considered removable. Without this patch, the user-agent is forced to choose a memory block to remove randomly. Sample output of the sysfs files: ./memory/memory0/removable: 0 ./memory/memory1/removable: 0 ./memory/memory2/removable: 0 ./memory/memory3/removable: 0 ./memory/memory4/removable: 0 ./memory/memory5/removable: 0 ./memory/memory6/removable: 0 ./memory/memory7/removable: 1 ./memory/memory8/removable: 0 ./memory/memory9/removable: 0 ./memory/memory10/removable: 0 ./memory/memory11/removable: 0 ./memory/memory12/removable: 0 ./memory/memory13/removable: 0 ./memory/memory14/removable: 0 ./memory/memory15/removable: 0 ./memory/memory16/removable: 0 ./memory/memory17/removable: 1 ./memory/memory18/removable: 1 ./memory/memory19/removable: 1 ./memory/memory20/removable: 1 ./memory/memory21/removable: 1 ./memory/memory22/removable: 1 Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
224 lines
6.3 KiB
C
224 lines
6.3 KiB
C
#ifndef __LINUX_MEMORY_HOTPLUG_H
|
|
#define __LINUX_MEMORY_HOTPLUG_H
|
|
|
|
#include <linux/mmzone.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/notifier.h>
|
|
|
|
struct page;
|
|
struct zone;
|
|
struct pglist_data;
|
|
struct mem_section;
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
|
|
/*
|
|
* Types for free bootmem.
|
|
* The normal smallest mapcount is -1. Here is smaller value than it.
|
|
*/
|
|
#define SECTION_INFO (-1 - 1)
|
|
#define MIX_SECTION_INFO (-1 - 2)
|
|
#define NODE_INFO (-1 - 3)
|
|
|
|
/*
|
|
* pgdat resizing functions
|
|
*/
|
|
static inline
|
|
void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
|
|
{
|
|
spin_lock_irqsave(&pgdat->node_size_lock, *flags);
|
|
}
|
|
static inline
|
|
void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
|
|
{
|
|
spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
|
|
}
|
|
static inline
|
|
void pgdat_resize_init(struct pglist_data *pgdat)
|
|
{
|
|
spin_lock_init(&pgdat->node_size_lock);
|
|
}
|
|
/*
|
|
* Zone resizing functions
|
|
*/
|
|
static inline unsigned zone_span_seqbegin(struct zone *zone)
|
|
{
|
|
return read_seqbegin(&zone->span_seqlock);
|
|
}
|
|
static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
|
|
{
|
|
return read_seqretry(&zone->span_seqlock, iv);
|
|
}
|
|
static inline void zone_span_writelock(struct zone *zone)
|
|
{
|
|
write_seqlock(&zone->span_seqlock);
|
|
}
|
|
static inline void zone_span_writeunlock(struct zone *zone)
|
|
{
|
|
write_sequnlock(&zone->span_seqlock);
|
|
}
|
|
static inline void zone_seqlock_init(struct zone *zone)
|
|
{
|
|
seqlock_init(&zone->span_seqlock);
|
|
}
|
|
extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
|
|
extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
|
|
extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
|
|
/* need some defines for these for archs that don't support it */
|
|
extern void online_page(struct page *page);
|
|
/* VM interface that may be used by firmware interface */
|
|
extern int online_pages(unsigned long, unsigned long);
|
|
extern void __offline_isolated_pages(unsigned long, unsigned long);
|
|
extern int offline_pages(unsigned long, unsigned long, unsigned long);
|
|
|
|
/* reasonably generic interface to expand the physical pages in a zone */
|
|
extern int __add_pages(struct zone *zone, unsigned long start_pfn,
|
|
unsigned long nr_pages);
|
|
extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
|
|
unsigned long nr_pages);
|
|
|
|
#ifdef CONFIG_NUMA
|
|
extern int memory_add_physaddr_to_nid(u64 start);
|
|
#else
|
|
static inline int memory_add_physaddr_to_nid(u64 start)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
|
|
/*
|
|
* For supporting node-hotadd, we have to allocate a new pgdat.
|
|
*
|
|
* If an arch has generic style NODE_DATA(),
|
|
* node_data[nid] = kzalloc() works well. But it depends on the architecture.
|
|
*
|
|
* In general, generic_alloc_nodedata() is used.
|
|
* Now, arch_free_nodedata() is just defined for error path of node_hot_add.
|
|
*
|
|
*/
|
|
extern pg_data_t *arch_alloc_nodedata(int nid);
|
|
extern void arch_free_nodedata(pg_data_t *pgdat);
|
|
extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
|
|
|
|
#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
|
|
|
|
#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
|
|
#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
|
|
|
|
#ifdef CONFIG_NUMA
|
|
/*
|
|
* If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
|
|
* XXX: kmalloc_node() can't work well to get new node's memory at this time.
|
|
* Because, pgdat for the new node is not allocated/initialized yet itself.
|
|
* To use new node's memory, more consideration will be necessary.
|
|
*/
|
|
#define generic_alloc_nodedata(nid) \
|
|
({ \
|
|
kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
|
|
})
|
|
/*
|
|
* This definition is just for error path in node hotadd.
|
|
* For node hotremove, we have to replace this.
|
|
*/
|
|
#define generic_free_nodedata(pgdat) kfree(pgdat)
|
|
|
|
extern pg_data_t *node_data[];
|
|
static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
|
|
{
|
|
node_data[nid] = pgdat;
|
|
}
|
|
|
|
#else /* !CONFIG_NUMA */
|
|
|
|
/* never called */
|
|
static inline pg_data_t *generic_alloc_nodedata(int nid)
|
|
{
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
static inline void generic_free_nodedata(pg_data_t *pgdat)
|
|
{
|
|
}
|
|
static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NUMA */
|
|
#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
|
|
{
|
|
}
|
|
static inline void put_page_bootmem(struct page *page)
|
|
{
|
|
}
|
|
#else
|
|
extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
|
|
extern void put_page_bootmem(struct page *page);
|
|
#endif
|
|
|
|
#else /* ! CONFIG_MEMORY_HOTPLUG */
|
|
/*
|
|
* Stub functions for when hotplug is off
|
|
*/
|
|
static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
|
|
static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
|
|
static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
|
|
|
|
static inline unsigned zone_span_seqbegin(struct zone *zone)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void zone_span_writelock(struct zone *zone) {}
|
|
static inline void zone_span_writeunlock(struct zone *zone) {}
|
|
static inline void zone_seqlock_init(struct zone *zone) {}
|
|
|
|
static inline int mhp_notimplemented(const char *func)
|
|
{
|
|
printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
|
|
dump_stack();
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
|
|
{
|
|
}
|
|
|
|
#endif /* ! CONFIG_MEMORY_HOTPLUG */
|
|
|
|
/*
|
|
* Walk through all memory which is registered as resource.
|
|
* arg is (start_pfn, nr_pages, private_arg_pointer)
|
|
*/
|
|
extern int walk_memory_resource(unsigned long start_pfn,
|
|
unsigned long nr_pages, void *arg,
|
|
int (*func)(unsigned long, unsigned long, void *));
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
|
|
extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
|
|
|
|
#else
|
|
static inline int is_mem_section_removable(unsigned long pfn,
|
|
unsigned long nr_pages)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
|
|
extern int add_memory(int nid, u64 start, u64 size);
|
|
extern int arch_add_memory(int nid, u64 start, u64 size);
|
|
extern int remove_memory(u64 start, u64 size);
|
|
extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
|
|
int nr_pages);
|
|
extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
|
|
extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
|
|
unsigned long pnum);
|
|
|
|
#endif /* __LINUX_MEMORY_HOTPLUG_H */
|