[Qemu-devel] [PATCH 26/28] memory: use find_next_bit() to find dirty bits

[Juan Quintela]

This operation is way faster that doing it bit by bit.

Signed-off-by: Juan Quintela <address@hidden>
---
 include/exec/memory-internal.h | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index 0c1dbfa..5a5bc0d 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -44,18 +44,15 @@ static inline bool cpu_physical_memory_get_dirty(ram_addr_t 
start,
                                                  ram_addr_t length,
                                                  unsigned client)
 {
-    ram_addr_t addr, end;
+    unsigned long end, page, next;

     assert(client < DIRTY_MEMORY_NUM);

-    end = TARGET_PAGE_ALIGN(start + length);
-    start &= TARGET_PAGE_MASK;
-    for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
-        if (test_bit(addr >> TARGET_PAGE_BITS, ram_list.dirty_memory[client])) 
{
-            return true;
-        }
-    }
-    return false;
+    end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
+    page = start >> TARGET_PAGE_BITS;
+    next = find_next_bit(ram_list.dirty_memory[client], end, page);
+
+    return next < end;
 }

 static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr,
-- 
1.8.3.1