[Qemu-devel] [PATCH v1 2/2] reduce qemu's heap Rss size from 12252kB to 2752KB

[Yang Zhong <yang.zhong@intel.com>]

There is no need to delete subregion and do memory begin/commit for
subpage in memory_region_finalize().

This patch is from Anthony Xu <anthony.xu@intel.com>.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
---
 memory.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/memory.c b/memory.c
index 284894b..3e9bfff 100644
--- a/memory.c
+++ b/memory.c
@@ -1505,13 +1505,14 @@ static void memory_region_finalize(Object *obj)
      * and cause an infinite loop.
      */
     mr->enabled = false;
-    memory_region_transaction_begin();
-    while (!QTAILQ_EMPTY(&mr->subregions)) {
-        MemoryRegion *subregion = QTAILQ_FIRST(&mr->subregions);
-        memory_region_del_subregion(mr, subregion);
+    if (!mr->subpage) {
+        memory_region_transaction_begin();
+        while (!QTAILQ_EMPTY(&mr->subregions)) {
+            MemoryRegion *subregion = QTAILQ_FIRST(&mr->subregions);
+            memory_region_del_subregion(mr, subregion);
+        }
+        memory_region_transaction_commit();
     }
-    memory_region_transaction_commit();
-
     mr->destructor(mr);
     memory_region_clear_coalescing(mr);
     g_free((char *)mr->name);
-- 
1.9.1