aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/hv
diff options
context:
space:
mode:
authorK. Y. Srinivasan <kys@microsoft.com>2013-02-08 15:57:15 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-02-08 15:42:01 -0800
commite500d158fb07794724f12655f2eb5702fec613c4 (patch)
tree063ae9f082e012f98ecf7773e83f2d7f3f36b292 /drivers/hv
parente1e0a9e6991ec2c611f13dfc0a6bc1a214a22374 (diff)
Drivers: hv: balloon: Add a parameter to delay pressure reporting
Delay reporting memory pressure by a specified amount of time. This addresses the problem where the host may take memory balancing decisions based on incorrect memory pressure data that will be posted as soon as the balloon driver is loaded. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/hv_balloon.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 32a96f164dc8..f8fc99600de8 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -414,10 +414,17 @@ struct dm_info_msg {
static bool hot_add;
static bool do_hot_add;
+/*
+ * Delay reporting memory pressure by
+ * the specified number of seconds.
+ */
+static uint pressure_report_delay = 30;
module_param(hot_add, bool, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(hot_add, "If set attempt memory hot_add");
+module_param(pressure_report_delay, uint, (S_IRUGO | S_IWUSR));
+MODULE_PARM_DESC(pressure_report_delay, "Delay in secs in reporting pressure");
static atomic_t trans_id = ATOMIC_INIT(0);
static int dm_ring_size = (5 * PAGE_SIZE);
@@ -531,6 +538,10 @@ static void post_status(struct hv_dynmem_device *dm)
struct dm_status status;
struct sysinfo val;
+ if (pressure_report_delay > 0) {
+ --pressure_report_delay;
+ return;
+ }
si_meminfo(&val);
memset(&status, 0, sizeof(struct dm_status));
status.hdr.type = DM_STATUS_REPORT;
@@ -552,8 +563,6 @@ static void post_status(struct hv_dynmem_device *dm)
}
-
-
static void free_balloon_pages(struct hv_dynmem_device *dm,
union dm_mem_page_range *range_array)
{

Privacy Policy