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memory hotplug: rearrange memory hotplug notifier

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Current memory notifier has some defects yet.  (Fortunately, nothing uses
it.) This patch is to fix and rearrange for them.

  - Add information of start_pfn, nr_pages, and node id if node status is
    changes from/to memoryless node for callback functions.
    Callbacks can't do anything without those information.
  - Add notification going-online status.
    It is necessary for creating per node structure before the node's
    pages are available.
  - Move GOING_OFFLINE status notification after page isolation.
    It is good place for return memory like cache for callback,
    because returned page is not used again.
  - Make CANCEL events for rollingback when error occurs.
  - Delete MEM_MAPPING_INVALID notification. It will be not used.
  - Fix compile error of (un)register_memory_notifier().

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yasunori Goto
2007-10-21 16:41:36 -07:00
committed by Linus Torvalds
parent 10020ca246
commit 7b78d335ac
3 changed files with 61 additions and 23 deletions
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27
include/linux/memory.h
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@@ -41,18 +41,15 @@ struct memory_block {
#define MEM_ONLINE (1<<0) /* exposed to userspace */
#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
#define MEM_OFFLINE (1<<2) /* exposed to userspace */
#define MEM_GOING_ONLINE (1<<3)
#define MEM_CANCEL_ONLINE (1<<4)
#define MEM_CANCEL_OFFLINE (1<<5)
/*
* All of these states are currently kernel-internal for notifying
* kernel components and architectures.
*
* For MEM_MAPPING_INVALID, all notifier chains with priority >0
* are called before pfn_to_page() becomes invalid. The priority=0
* entry is reserved for the function that actually makes
* pfn_to_page() stop working. Any notifiers that want to be called
* after that should have priority <0.
*/
#define MEM_MAPPING_INVALID (1<<3)
struct memory_notify {
unsigned long start_pfn;
unsigned long nr_pages;
int status_change_nid;
};
struct notifier_block;
struct mem_section;
@@ -69,12 +66,18 @@ static inline int register_memory_notifier(struct notifier_block *nb)
static inline void unregister_memory_notifier(struct notifier_block *nb)
{
}
static inline int memory_notify(unsigned long val, void *v)
{
return 0;
}
#else
extern int register_memory_notifier(struct notifier_block *nb);
extern void unregister_memory_notifier(struct notifier_block *nb);
extern int register_new_memory(struct mem_section *);
extern int unregister_memory_section(struct mem_section *);
extern int memory_dev_init(void);
extern int remove_memory_block(unsigned long, struct mem_section *, int);
extern int memory_notify(unsigned long val, void *v);
#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)