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thp: remove PG_buddy

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PG_buddy can be converted to _mapcount == -2.  So the PG_compound_lock can
be added to page->flags without overflowing (because of the sparse section
bits increasing) with CONFIG_X86_PAE=y and CONFIG_X86_PAT=y.  This also
has to move the memory hotplug code from _mapcount to lru.next to avoid
any risk of clashes.  We can't use lru.next for PG_buddy removal, but
memory hotplug can use lru.next even more easily than the mapcount
instead.

Signed-off-by: Andrea Arcangeli <aarcange@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:
Andrea Arcangeli 2011-01-13 15:47:00 -08:00 • committed by Linus Torvalds
parent 21ae5b0175
commit 5f24ce5fd3
7 changed files with 52 additions and 29 deletions
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14
include/linux/memory_hotplug.h
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@ -13,12 +13,16 @@ struct mem_section;
#ifdef CONFIG_MEMORY_HOTPLUG
/*
* Types for free bootmem.
* The normal smallest mapcount is -1. Here is smaller value than it.
* Types for free bootmem stored in page->lru.next. These have to be in
* some random range in unsigned long space for debugging purposes.
*/
#define SECTION_INFO (-1 - 1)
#define MIX_SECTION_INFO (-1 - 2)
#define NODE_INFO (-1 - 3)
enum {
MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
MIX_SECTION_INFO,
NODE_INFO,
MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
};
/*
* pgdat resizing functions