xen/tmem: Don't use self[ballooning|shrinking] if frontswap is off.
There is no point. We would just squeeze the guest to put more and
more pages in the swap disk without any purpose.
The only time it makes sense to use the selfballooning and shrinking
is when frontswap is being utilized.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c
index c1df0ff..18e8bd8 100644
--- a/drivers/xen/tmem.c
+++ b/drivers/xen/tmem.c
@@ -403,6 +403,14 @@
}
#endif
#ifdef CONFIG_XEN_SELFBALLOONING
+ /*
+ * There is no point of driving pages to the swap system if they
+ * aren't going anywhere in tmem universe.
+ */
+ if (!frontswap) {
+ selfshrinking = false;
+ selfballooning = false;
+ }
xen_selfballoon_init(selfballooning, selfshrinking);
#endif
return 0;