diff options
| author | Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2005-01-07 22:01:18 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@evo.osdl.org> | 2005-01-07 22:01:18 -0800 |
| commit | 6951e82fe339eb35a7a0b8042eba9d015d79be55 (patch) | |
| tree | c7f80ff16e56988553b916f4d4370df73fd1641b /include/linux | |
| parent | ce1d9c8aadcaf399793405fb5a090f2abe3ec581 (diff) | |
[PATCH] no buddy bitmap patch revist: intro and includes
Followings are patches for removing bitmaps from the buddy allocator. This
is benefical to memory-hot-plug stuffs, because this removes a data
structure which must meet to a host's physical memory layout.
This is one step to manage physical memory in nonlinear / discontiguous way
and will reduce some amounts of codes to implement memory-hot-plug.
This patch removes bitmaps from zone->free_area[] in include/linux/mmzone.h,
and adds some comments on page->private field in include/linux/mm.h.
non-atomic ops for changing PG_private bit is added in include/page-flags.h.
zone->lock is always acquired when PG_private of "a free page" is changed.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mm.h | 2 | ||||
| -rw-r--r-- | include/linux/mmzone.h | 1 | ||||
| -rw-r--r-- | include/linux/page-flags.h | 2 |
3 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index a52b121c639e..ee9817135376 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -232,6 +232,8 @@ struct page { * usually used for buffer_heads * if PagePrivate set; used for * swp_entry_t if PageSwapCache + * When page is free, this indicates + * order in the buddy system. */ struct address_space *mapping; /* If low bit clear, points to * inode address_space, or NULL. diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index be10c51967db..1d46bd35ab78 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -22,7 +22,6 @@ struct free_area { struct list_head free_list; - unsigned long *map; unsigned long nr_free; }; diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index af926cfe07b7..f11387a4cc50 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -239,6 +239,8 @@ extern unsigned long __read_page_state(unsigned offset); #define SetPagePrivate(page) set_bit(PG_private, &(page)->flags) #define ClearPagePrivate(page) clear_bit(PG_private, &(page)->flags) #define PagePrivate(page) test_bit(PG_private, &(page)->flags) +#define __SetPagePrivate(page) __set_bit(PG_private, &(page)->flags) +#define __ClearPagePrivate(page) __clear_bit(PG_private, &(page)->flags) #define PageWriteback(page) test_bit(PG_writeback, &(page)->flags) #define SetPageWriteback(page) \ |