Maintain the number of dirty pages

Calculate the number of dirty pages takes a lot on hosts with lots
of memory.  Just maintain how many pages are dirty.

Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 1 insertions, 14 deletions

diff --git a/arch_init.c b/arch_init.c
index 64b85fd1b1..5b0f5626a9 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -238,20 +238,7 @@ static uint64_t bytes_transferred;
 
 static ram_addr_t ram_save_remaining(void)
 {
-    RAMBlock *block;
-    ram_addr_t count = 0;
-
-    QLIST_FOREACH(block, &ram_list.blocks, next) {
-        ram_addr_t addr;
-        for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
-            if (memory_region_get_dirty(block->mr, addr, TARGET_PAGE_SIZE,
-                                        DIRTY_MEMORY_MIGRATION)) {
-                count++;
-            }
-        }
-    }
-
-    return count;
+    return ram_list.dirty_pages;
 }
 
 uint64_t ram_bytes_remaining(void)