Currently, the balloon floor value is automatically computed, but may be
too small depending on app usage of memory. This patch adds a balloon_floor
value as a module parameter that can be used to manually configure the
balloon floor value.
Signed-off-by: Angelina Vu <angelinavu@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/hv_balloon.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 64ac5bdee3a6..87b312f99b2e 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1101,6 +1101,10 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
}
}
+unsigned long balloon_floor;
+module_param(balloon_floor, ulong, 0644);
+MODULE_PARM_DESC(balloon_floor, "Memory level (in megabytes) that ballooning will not remove");
+
static unsigned long compute_balloon_floor(void)
{
unsigned long min_pages;
@@ -1117,6 +1121,9 @@ static unsigned long compute_balloon_floor(void)
* 8192 744 (1/16)
* 32768 1512 (1/32)
*/
+ if (balloon_floor)
+ return MB2PAGES(balloon_floor);
+
if (nr_pages < MB2PAGES(128))
min_pages = MB2PAGES(8) + (nr_pages >> 1);
else if (nr_pages < MB2PAGES(512))
--
2.34.1
