mm: treat indirectly reclaimable memory as available in MemAvailable

Adjust /proc/meminfo MemAvailable calculation by adding the amount of
indirectly reclaimable memory (rounded to the PAGE_SIZE).

This change is referenced from commit 034ebf65c3c2 ("mm: treat indirectly
reclaimable memory as available in MemAvailable") on upstream, as node
based vmstat global_node_page_state is not present, zone based vmstat
global_page_state is used instead.

Change-Id: I7303d0f8ccd5993c7234a5187430d418d49e5763
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 9155a5a..b7594b9 100644 (file)
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -79,6 +79,13 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
        available += global_page_state(NR_SLAB_RECLAIMABLE) -
                     min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
 
+       /*
+        * Part of the kernel memory, which can be released under memory
+        * pressure.
+        */
+       available += global_page_state(NR_INDIRECTLY_RECLAIMABLE_BYTES) >>
+               PAGE_SHIFT;
+
        if (available < 0)
                available = 0;