static unsigned long highmem_dirtyable_memory(unsigned long total)
{
#ifdef CONFIG_HIGHMEM
int node;
unsigned long x = 0;
for_each_node_state(node, N_HIGH_MEMORY) {
unsigned long nr_pages;
struct zone *z =
&NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
nr_pages = zone_page_state(z, NR_FREE_PAGES) +
zone_reclaimable_pages(z);
/*
* make sure that the number of pages for this node
* is never "negative".
*/
nr_pages -= min(nr_pages, z->dirty_balance_reserve);
x += nr_pages;
}
static unsigned long highmem_dirtyable_memory(unsigned long total)
{
#ifdef CONFIG_HIGHMEM
int node;
unsigned long x = 0;
for_each_node_state(node, N_HIGH_MEMORY) {
struct zone *z =
&NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
x += zone_page_state(z, NR_FREE_PAGES) +
zone_reclaimable_pages(z);
}
/*
* Make sure that the number of highmem pages is never larger
* than the number of the total dirtyable memory. This can only
* occur in very strange VM situations but we want to make sure
* that this does not occur.
*/
return min(x, total);
#else
return 0;
#endif
}
