mm: Add total_unmovable_pages global variable
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>
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5489c43..60ad5e9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -96,6 +96,9 @@
unsigned long totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
+#ifdef CONFIG_FIX_MOVABLE_ZONE
+unsigned long total_unmovable_pages __read_mostly;
+#endif
int percpu_pagelist_fraction;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
@@ -174,6 +177,9 @@
};
EXPORT_SYMBOL(totalram_pages);
+#ifdef CONFIG_FIX_MOVABLE_ZONE
+EXPORT_SYMBOL(total_unmovable_pages);
+#endif
static char * const zone_names[MAX_NR_ZONES] = {
#ifdef CONFIG_ZONE_DMA