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mm: Add total_unmovable_pages global variable

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Vmalloc will exit if the amount it needs to allocate is
greater than totalram_pages. Vmalloc cannot allocate
from the movable zone, so pages in the movable zone should
not be counted.

This change adds a new global variable: total_unmovable_pages.
It is calculated in init.c, based on totalram_pages minus
the pages in the movable zone. Vmalloc now looks at this new
global instead of totalram_pages.

total_unmovable_pages can be modified during memory_hotplug.
If the zone you are offlining/onlining is unmovable, then
you modify it similar to totalram_pages.  If the zone is
movable, then no change is needed.

Change-Id: Ie55c41051e9ad4b921eb04ecbb4798a8bd2344d6
Signed-off-by: Jack Cheung <jackc@codeaurora.org>
This commit is contained in:
Jack Cheung
2011-11-29 16:52:49 -08:00
parent c3a5a8cb8a
commit 59f9f1c9ae
5 changed files with 50 additions and 5 deletions
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7
mm/vmalloc.c
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@@ -1611,9 +1611,14 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
struct vm_struct *area;
void *addr;
unsigned long real_size = size;
#ifdef CONFIG_FIX_MOVABLE_ZONE
unsigned long total_pages = total_unmovable_pages;
#else
unsigned long total_pages = totalram_pages;
#endif
size = PAGE_ALIGN(size);
if (!size || (size >> PAGE_SHIFT) > totalram_pages)
if (!size || (size >> PAGE_SHIFT) > total_pages)
return NULL;
area = __get_vm_area_node(size, align, VM_ALLOC, start, end, node,