diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2007-10-16 10:26:12 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 18:43:02 +0200 |
| commit | 0c0e6195896535481173df98935ad8db174f4d45 (patch) | |
| tree | 2b35d3b81ba54b5d38e691d2a2019f4bcdfd1dce /include | |
| parent | memory unplug: page isolation (diff) | |
| download | linux-0c0e6195896535481173df98935ad8db174f4d45.tar.xz linux-0c0e6195896535481173df98935ad8db174f4d45.zip | |
memory unplug: page offline
Logic.
- set all pages in [start,end) as isolated migration-type.
by this, all free pages in the range will be not-for-use.
- Migrate all LRU pages in the range.
- Test all pages in the range's refcnt is zero or not.
Todo:
- allocate migration destination page from better area.
- confirm page_count(page)== 0 && PageReserved(page) page is safe to be freed..
(I don't like this kind of page but..
- Find out pages which cannot be migrated.
- more running tests.
- Use reclaim for unplugging other memory type area.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/kernel.h | 1 | ||||
| -rw-r--r-- | include/linux/memory_hotplug.h | 5 |
2 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index d9725a28a265..5fdbc814c2eb 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -35,6 +35,7 @@ extern const char linux_proc_banner[]; #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) +#define IS_ALIGNED(x,a) (((x) % ((typeof(x))(a))) == 0) #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 0a14dad95453..665951ef0390 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -58,7 +58,10 @@ extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); extern void online_page(struct page *page); /* VM interface that may be used by firmware interface */ extern int online_pages(unsigned long, unsigned long); - +#ifdef CONFIG_MEMORY_HOTREMOVE +extern int offline_pages(unsigned long, unsigned long, unsigned long); +extern void __offline_isolated_pages(unsigned long, unsigned long); +#endif /* 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); |