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Subject[PATCH 2/2] mm: reimplement si_mem_available()
Date
Reimplement si_mem_available() by reusing si_mem_available_node().

Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
---
mm/page_alloc.c | 45 +++++++--------------------------------------
1 file changed, 7 insertions(+), 38 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 31f5e3e335cf..0982372c8e49 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5782,46 +5782,15 @@ long si_mem_available_node(struct sysinfo *val, int nid)

long si_mem_available(void)
{
- long available;
- unsigned long pagecache;
- unsigned long wmark_low = 0;
- unsigned long pages[NR_LRU_LISTS];
- unsigned long reclaimable;
- struct zone *zone;
- int lru;
-
- for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
- pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
-
- for_each_zone(zone)
- wmark_low += low_wmark_pages(zone);
-
- /*
- * Estimate the amount of memory available for userspace allocations,
- * without causing swapping.
- */
- available = global_zone_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;
+ long available = 0;
+ struct sysinfo i;
+ int nid;

- /*
- * Part of the reclaimable slab and other kernel memory consists of
- * items that are in use, and cannot be freed. Cap this estimate at the
- * low watermark.
- */
- reclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) +
- global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE);
- available += reclaimable - min(reclaimable / 2, wmark_low);
+ for_each_online_node(nid) {
+ si_meminfo_node(&i, nid);
+ available += si_mem_available_node(&i, nid);
+ }

- if (available < 0)
- available = 0;
return available;
}
EXPORT_SYMBOL_GPL(si_mem_available);
--
2.11.0
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