diff options
| -rw-r--r-- | mm/page_alloc.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 27614065430..e9075fdef69 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2813,6 +2813,15 @@ void free_pages_exact(void *virt, size_t size) } EXPORT_SYMBOL(free_pages_exact); +/** + * nr_free_zone_pages - count number of pages beyond high watermark + * @offset: The zone index of the highest zone + * + * nr_free_zone_pages() counts the number of counts pages which are beyond the + * high watermark within all zones at or below a given zone index. For each + * zone, the number of pages is calculated as: + * present_pages - high_pages + */ static unsigned long nr_free_zone_pages(int offset) { struct zoneref *z; @@ -2833,8 +2842,11 @@ static unsigned long nr_free_zone_pages(int offset) return sum; } -/* - * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL +/** + * nr_free_buffer_pages - count number of pages beyond high watermark + * + * nr_free_buffer_pages() counts the number of pages which are beyond the high + * watermark within ZONE_DMA and ZONE_NORMAL. */ unsigned long nr_free_buffer_pages(void) { @@ -2842,8 +2854,11 @@ unsigned long nr_free_buffer_pages(void) } EXPORT_SYMBOL_GPL(nr_free_buffer_pages); -/* - * Amount of free RAM allocatable within all zones +/** + * nr_free_pagecache_pages - count number of pages beyond high watermark + * + * nr_free_pagecache_pages() counts the number of pages which are beyond the + * high watermark within all zones. */ unsigned long nr_free_pagecache_pages(void) { |