Implement get_sample_page_period() and set_sample_page_period() to
sleep specific time between sample actions.
Signed-off-by: Chuan Zheng <zhengch...@huawei.com>
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
---
migration/dirtyrate.c | 24 ++++++++++++++++++++++++
migration/dirtyrate.h | 2 ++
2 files changed, 26 insertions(+)
diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index bd398b7..d1c0a78 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -28,6 +28,30 @@
static int CalculatingState = DIRTY_RATE_STATUS_UNSTARTED;
static struct DirtyRateStat DirtyStat;
+static int64_t set_sample_page_period(int64_t msec, int64_t initial_time)
+{
+ int64_t current_time;
+
+ current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ if ((current_time - initial_time) >= msec) {
+ msec = current_time - initial_time;
+ } else {
+ g_usleep((msec + initial_time - current_time) * 1000);
+ }
+
+ return msec;
+}
+
+static int64_t get_sample_page_period(int64_t sec)
+{
+ if (sec <= MIN_FETCH_DIRTYRATE_TIME_SEC ||
+ sec > MAX_FETCH_DIRTYRATE_TIME_SEC) {
+ sec = DEFAULT_FETCH_DIRTYRATE_TIME_SEC;
+ }
+
+ return sec;
+}
+
static int dirtyrate_set_state(int *state, int old_state, int new_state)
{
assert(new_state < DIRTY_RATE_STATUS__MAX);
diff --git a/migration/dirtyrate.h b/migration/dirtyrate.h
index 600bceb..cf14647 100644
--- a/migration/dirtyrate.h
+++ b/migration/dirtyrate.h
@@ -51,6 +51,8 @@
/* Take 1s as default for calculation duration */
#define DEFAULT_FETCH_DIRTYRATE_TIME_SEC 1
+#define MIN_FETCH_DIRTYRATE_TIME_SEC 0
+#define MAX_FETCH_DIRTYRATE_TIME_SEC 60
struct DirtyRateConfig {
uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
--
1.8.3.1
