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>
diff --git a/exec-obsolete.h b/exec-obsolete.h
index f8ffce6..c099256 100644
--- a/exec-obsolete.h
+++ b/exec-obsolete.h
@@ -74,6 +74,11 @@
static inline int cpu_physical_memory_set_dirty_flags(ram_addr_t addr,
int dirty_flags)
{
+ if ((dirty_flags & MIGRATION_DIRTY_FLAG) &&
+ !cpu_physical_memory_get_dirty(addr, TARGET_PAGE_SIZE,
+ MIGRATION_DIRTY_FLAG)) {
+ ram_list.dirty_pages++;
+ }
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] |= dirty_flags;
}
@@ -87,6 +92,11 @@
{
int mask = ~dirty_flags;
+ if ((dirty_flags & MIGRATION_DIRTY_FLAG) &&
+ cpu_physical_memory_get_dirty(addr, TARGET_PAGE_SIZE,
+ MIGRATION_DIRTY_FLAG)) {
+ ram_list.dirty_pages--;
+ }
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] &= mask;
}