diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mmzone.h | 19 | ||||
| -rw-r--r-- | include/linux/sysctl.h | 1 |
2 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index d60c10f0d9e2..21e95664fdf8 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -249,6 +249,25 @@ static inline struct zone *next_zone(struct zone *zone) #define for_each_zone(zone) \ for (zone = pgdat_list->node_zones; zone; zone = next_zone(zone)) +/** + * is_highmem - helper function to quickly check if a struct zone is a + * highmem zone or not. This is an attempt to keep references + * to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum. + * @zone - pointer to struct zone variable + */ +static inline int is_highmem(struct zone *zone) +{ + return (zone - zone->zone_pgdat->node_zones == ZONE_HIGHMEM); +} + +/* These two functions are used to setup the per zone pages min values */ +struct ctl_table; +struct file; +int min_free_kbytes_sysctl_handler(struct ctl_table *, int, struct file *, + void *, size_t *); +extern void setup_per_zone_pages_min(void); + + #ifdef CONFIG_NUMA #define MAX_NR_MEMBLKS BITS_PER_LONG /* Max number of Memory Blocks */ #else /* !CONFIG_NUMA */ diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index bbd0b376d757..e037c4de0522 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -156,6 +156,7 @@ enum VM_HUGETLB_PAGES=18, /* int: Number of available Huge Pages */ VM_SWAPPINESS=19, /* Tendency to steal mapped memory */ VM_LOWER_ZONE_PROTECTION=20,/* Amount of protection of lower zones */ + VM_MIN_FREE_KBYTES=21, /* Minimum free kilobytes to maintain */ }; |