[Qemu-devel] [RFC][PATCH 9/9] migration: do not search dirty pages in bulk stage

[Peter Lieven <pl@dlhnet.de>]

avoid searching for dirty pages just increment the
page offset. all pages are dirty anyway.

Signed-off-by: Peter Lieven <pl@kamp.de>
---
  arch_init.c |   10 ++++++++--
  1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index abd54a7..45fcf4d 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -336,8 +336,14 @@ ram_addr_t migration_bitmap_find_and_reset_dirty(MemoryRegion *mr,
      unsigned long nr = base + (start >> TARGET_PAGE_BITS);
      unsigned long size = base + (int128_get64(mr->size) >> TARGET_PAGE_BITS);

-    unsigned long next = find_next_bit(migration_bitmap, size, nr);
-
+    unsigned long next;
+
+    if (ram_bulk_stage) {
+        next = nr + 1;
+    } else {
+        next = find_next_bit(migration_bitmap, size, nr);
+    }
+
      if (next < size) {
          clear_bit(next, migration_bitmap);
          migration_dirty_pages--;
-- 
1.7.9.5