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 <[email protected]> --- 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
