diff --git a/migration-dirtyrate-Add-dirtyrate-statistics-series-.patch b/migration-dirtyrate-Add-dirtyrate-statistics-series-.patch
new file mode 100644
index 0000000..1d56f80
--- /dev/null
+++ b/migration-dirtyrate-Add-dirtyrate-statistics-series-.patch
@@ -0,0 +1,93 @@
+From d1340703e127c02e9a586143039507ba10d73cfb Mon Sep 17 00:00:00 2001
+From: Chuan Zheng <zhengchuan@huawei.com>
+Date: Wed, 16 Sep 2020 14:21:59 +0800
+Subject: [PATCH] migration/dirtyrate: Add dirtyrate statistics series
+ functions
+
+Add dirtyrate statistics functions to record/update dirtyrate info.
+
+Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
+Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
+Reviewed-by: Li Qiang <liq3ea@gmail.com>
+Message-Id: <1600237327-33618-5-git-send-email-zhengchuan@huawei.com>
+Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
+---
+ migration/dirtyrate.c | 32 ++++++++++++++++++++++++++++++++
+ migration/dirtyrate.h | 12 ++++++++++++
+ 2 files changed, 44 insertions(+)
+
+diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
+index 44a60bf10d..cbb323d6ec 100644
+--- a/migration/dirtyrate.c
++++ b/migration/dirtyrate.c
+@@ -23,6 +23,7 @@
+ #include "dirtyrate.h"
+ 
+ static int CalculatingState = DIRTY_RATE_STATUS_UNSTARTED;
++static struct DirtyRateStat DirtyStat;
+ 
+ static int dirtyrate_set_state(int *state, int old_state, int new_state)
+ {
+@@ -34,6 +35,37 @@ static int dirtyrate_set_state(int *state, int old_state, int new_state)
+     }
+ }
+ 
++static void reset_dirtyrate_stat(void)
++{
++    DirtyStat.total_dirty_samples = 0;
++    DirtyStat.total_sample_count = 0;
++    DirtyStat.total_block_mem_MB = 0;
++    DirtyStat.dirty_rate = -1;
++    DirtyStat.start_time = 0;
++    DirtyStat.calc_time = 0;
++}
++
++static void update_dirtyrate_stat(struct RamblockDirtyInfo *info)
++{
++    DirtyStat.total_dirty_samples += info->sample_dirty_count;
++    DirtyStat.total_sample_count += info->sample_pages_count;
++    /* size of total pages in MB */
++    DirtyStat.total_block_mem_MB += (info->ramblock_pages *
++                                     TARGET_PAGE_SIZE) >> 20;
++}
++
++static void update_dirtyrate(uint64_t msec)
++{
++    uint64_t dirtyrate;
++    uint64_t total_dirty_samples = DirtyStat.total_dirty_samples;
++    uint64_t total_sample_count = DirtyStat.total_sample_count;
++    uint64_t total_block_mem_MB = DirtyStat.total_block_mem_MB;
++
++    dirtyrate = total_dirty_samples * total_block_mem_MB *
++                1000 / (total_sample_count * msec);
++
++    DirtyStat.dirty_rate = dirtyrate;
++}
+ 
+ static void calculate_dirtyrate(struct DirtyRateConfig config)
+ {
+diff --git a/migration/dirtyrate.h b/migration/dirtyrate.h
+index 8707df852d..312debca6f 100644
+--- a/migration/dirtyrate.h
++++ b/migration/dirtyrate.h
+@@ -42,5 +42,17 @@ struct RamblockDirtyInfo {
+     uint32_t *hash_result; /* array of hash result for sampled pages */
+ };
+ 
++/*
++ * Store calculation statistics for each measure.
++ */
++struct DirtyRateStat {
++    uint64_t total_dirty_samples; /* total dirty sampled page */
++    uint64_t total_sample_count; /* total sampled pages */
++    uint64_t total_block_mem_MB; /* size of total sampled pages in MB */
++    int64_t dirty_rate; /* dirty rate in MB/s */
++    int64_t start_time; /* calculation start time in units of second */
++    int64_t calc_time; /* time duration of two sampling in units of second */
++};
++
+ void *get_dirtyrate_thread(void *arg);
+ #endif
+-- 
+2.27.0
+