[PATCH] drivers: xen-selfballoon: consider slab pages

[Bob Liu <lliubbo@gmail.com>]

Currently the goal_page in xen-selfballon doesn't consider much about pages used
in kernel space.
A typical usage is slab pages, without consider slab pages the goal_page result
may be too rough and lead extra memory pressure to guest os.

Signed-off-by: Bob Liu <bob.liu@oracle.com>
---
 drivers/xen/xen-selfballoon.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
index 21e18c1..4814759 100644
--- a/drivers/xen/xen-selfballoon.c
+++ b/drivers/xen/xen-selfballoon.c
@@ -191,6 +191,8 @@ static void selfballoon_process(struct work_struct *work)
 		tgt_pages = cur_pages; /* default is no change */
 		goal_pages = vm_memory_committed() +
 				totalreserve_pages +
+				global_page_state(NR_SLAB_RECLAIMABLE) +
+				global_page_state(NR_SLAB_UNRECLAIMABLE) +
 				MB2PAGES(selfballoon_reserved_mb);
 #ifdef CONFIG_FRONTSWAP
 		/* allow space for frontswap pages to be repatriated */
-- 
1.7.10.4