[PATCH v1 4/6] migration/dirtyrate: adjust struct DirtyRateStat

[huangy81@xxxxxxxxxxxxxxx]

From: Hyman Huang(黄勇) <huangy81@xxxxxxxxxxxxxxx>

use union to store stat data of two mutual exclusive methods.

Signed-off-by: Hyman Huang(黄勇) <huangy81@xxxxxxxxxxxxxxx>
---
 migration/dirtyrate.c | 32 ++++++++++++++++++++------------
 migration/dirtyrate.h | 18 +++++++++++++++---
 2 files changed, 35 insertions(+), 15 deletions(-)

diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 3c1a824a41..7952eb6117 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -78,31 +78,39 @@ static struct DirtyRateInfo *query_dirty_rate_info(void)
     return info;
 }
 
-static void init_dirtyrate_stat(int64_t start_time, int64_t calc_time)
+static void init_dirtyrate_stat(int64_t start_time,
+                                int64_t calc_time,
+                                struct DirtyRateConfig config)
 {
-    DirtyStat.total_dirty_samples = 0;
-    DirtyStat.total_sample_count = 0;
-    DirtyStat.total_block_mem_MB = 0;
     DirtyStat.dirty_rate = -1;
     DirtyStat.start_time = start_time;
     DirtyStat.calc_time = calc_time;
+
+    if (config.vcpu) {
+        DirtyStat.method.vcpu.nvcpu = -1;
+        DirtyStat.method.vcpu.rates = NULL;
+    } else {
+        DirtyStat.method.vm.total_dirty_samples = 0;
+        DirtyStat.method.vm.total_sample_count = 0;
+        DirtyStat.method.vm.total_block_mem_MB = 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;
+    DirtyStat.method.vm.total_dirty_samples += info->sample_dirty_count;
+    DirtyStat.method.vm.total_sample_count += info->sample_pages_count;
     /* size of total pages in MB */
-    DirtyStat.total_block_mem_MB += (info->ramblock_pages *
+    DirtyStat.method.vm.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;
+    uint64_t total_dirty_samples = DirtyStat.method.vm.total_dirty_samples;
+    uint64_t total_sample_count = DirtyStat.method.vm.total_sample_count;
+    uint64_t total_block_mem_MB = DirtyStat.method.vm.total_block_mem_MB;
 
     dirtyrate = total_dirty_samples * total_block_mem_MB *
                 1000 / (total_sample_count * msec);
@@ -315,7 +323,7 @@ static bool compare_page_hash_info(struct RamblockDirtyInfo *info,
         update_dirtyrate_stat(block_dinfo);
     }
 
-    if (DirtyStat.total_sample_count == 0) {
+    if (DirtyStat.method.vm.total_sample_count == 0) {
         return false;
     }
 
@@ -371,7 +379,7 @@ void *get_dirtyrate_thread(void *arg)
 
     start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000;
     calc_time = config.sample_period_seconds;
-    init_dirtyrate_stat(start_time, calc_time);
+    init_dirtyrate_stat(start_time, calc_time, config);
 
     calculate_dirtyrate(config);
 
diff --git a/migration/dirtyrate.h b/migration/dirtyrate.h
index f20dd52d77..3ab8e81f42 100644
--- a/migration/dirtyrate.h
+++ b/migration/dirtyrate.h
@@ -54,16 +54,28 @@ struct RamblockDirtyInfo {
     uint32_t *hash_result; /* array of hash result for sampled pages */
 };
 
+typedef struct SampleVMStat {
+    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 */
+} SampleVMStat;
+
+typedef struct VcpuStat {
+    int nvcpu; /* number of vcpu */
+    DirtyRateVcpu *rates; /* array of dirty rate for each vcpu */
+} VcpuStat;
+
 /*
  * 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 */
+    union {
+        SampleVMStat vm;
+        VcpuStat vcpu;
+    } method;
 };
 
 void *get_dirtyrate_thread(void *arg);
-- 
2.24.3