diff options
| -rw-r--r-- | fs/proc/meminfo.c | 31 | ||||
| -rw-r--r-- | include/linux/mm.h | 1 | ||||
| -rw-r--r-- | mm/page_alloc.c | 43 |
3 files changed, 45 insertions, 30 deletions
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c index df4661abadc4..83720460c5bc 100644 --- a/fs/proc/meminfo.c +++ b/fs/proc/meminfo.c @@ -29,10 +29,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v) unsigned long committed; long cached; long available; - unsigned long pagecache; - unsigned long wmark_low = 0; unsigned long pages[NR_LRU_LISTS]; - struct zone *zone; int lru; /* @@ -51,33 +48,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v) for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) pages[lru] = global_page_state(NR_LRU_BASE + lru); - for_each_zone(zone) - wmark_low += zone->watermark[WMARK_LOW]; - - /* - * Estimate the amount of memory available for userspace allocations, - * without causing swapping. - */ - available = i.freeram - totalreserve_pages; - - /* - * Not all the page cache can be freed, otherwise the system will - * start swapping. Assume at least half of the page cache, or the - * low watermark worth of cache, needs to stay. - */ - pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; - pagecache -= min(pagecache / 2, wmark_low); - available += pagecache; - - /* - * Part of the reclaimable slab consists of items that are in use, - * and cannot be freed. Cap this estimate at the low watermark. - */ - available += global_page_state(NR_SLAB_RECLAIMABLE) - - min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low); - - if (available < 0) - available = 0; + available = si_mem_available(); /* * Tagged format, for easy grepping and expansion. diff --git a/include/linux/mm.h b/include/linux/mm.h index b3202612bb95..db9df3f78de1 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1875,6 +1875,7 @@ extern int __meminit init_per_zone_wmark_min(void); extern void mem_init(void); extern void __init mmap_init(void); extern void show_mem(unsigned int flags); +extern long si_mem_available(void); extern void si_meminfo(struct sysinfo * val); extern void si_meminfo_node(struct sysinfo *val, int nid); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 25a75da53c27..941b802e11ec 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3713,6 +3713,49 @@ static inline void show_node(struct zone *zone) printk("Node %d ", zone_to_nid(zone)); } +long si_mem_available(void) +{ + long available; + unsigned long pagecache; + unsigned long wmark_low = 0; + unsigned long pages[NR_LRU_LISTS]; + struct zone *zone; + int lru; + + for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) + pages[lru] = global_page_state(NR_LRU_BASE + lru); + + for_each_zone(zone) + wmark_low += zone->watermark[WMARK_LOW]; + + /* + * Estimate the amount of memory available for userspace allocations, + * without causing swapping. + */ + available = global_page_state(NR_FREE_PAGES) - totalreserve_pages; + + /* + * Not all the page cache can be freed, otherwise the system will + * start swapping. Assume at least half of the page cache, or the + * low watermark worth of cache, needs to stay. + */ + pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; + pagecache -= min(pagecache / 2, wmark_low); + available += pagecache; + + /* + * Part of the reclaimable slab consists of items that are in use, + * and cannot be freed. Cap this estimate at the low watermark. + */ + available += global_page_state(NR_SLAB_RECLAIMABLE) - + min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low); + + if (available < 0) + available = 0; + return available; +} +EXPORT_SYMBOL_GPL(si_mem_available); + void si_meminfo(struct sysinfo *val) { val->totalram = totalram_pages; |