memory: introduce total_dirty_pages to stat dirty pages

introduce global var total_dirty_pages to stat dirty pages
along with memory_global_dirty_log_sync.

Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

include/exec/ram_addr.h

@@ -26,6 +26,8 @@
 #include "exec/ramlist.h"
 #include "exec/ramblock.h"
 
+extern uint64_t total_dirty_pages;
+
 /**
  * clear_bmap_size: calculate clear bitmap size
  *
@@ -373,6 +375,10 @@ static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
                         qatomic_or(
                                 &blocks[DIRTY_MEMORY_MIGRATION][idx][offset],
                                 temp);
+                        if (unlikely(
+                            global_dirty_tracking & GLOBAL_DIRTY_DIRTY_RATE)) {
+                            total_dirty_pages += ctpopl(temp);
+                        }
                     }
 
                     if (tcg_enabled()) {
@@ -403,6 +409,9 @@ static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
         for (i = 0; i < len; i++) {
             if (bitmap[i] != 0) {
                 c = leul_to_cpu(bitmap[i]);
+                if (unlikely(global_dirty_tracking & GLOBAL_DIRTY_DIRTY_RATE)) {
+                    total_dirty_pages += ctpopl(c);
+                }
                 do {
                     j = ctzl(c);
                     c &= ~(1ul << j);

migration/dirtyrate.c

@@ -28,6 +28,13 @@
 #include "sysemu/runstate.h"
 #include "exec/memory.h"
 
+/*
+ * total_dirty_pages is procted by BQL and is used
+ * to stat dirty pages during the period of two
+ * memory_global_dirty_log_sync
+ */
+uint64_t total_dirty_pages;
+
 typedef struct DirtyPageRecord {
     uint64_t start_pages;
     uint64_t end_pages;