X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f233a6d6c7d459205695d95e840063beba932147..4c3d4cccb2f5fb04a2bc157ca321e107711cca53:/src/mc/mc_page_snapshot.cpp

diff --git a/src/mc/mc_page_snapshot.cpp b/src/mc/mc_page_snapshot.cpp
index 91dfcbd961..b180c4021c 100644
--- a/src/mc/mc_page_snapshot.cpp
+++ b/src/mc/mc_page_snapshot.cpp
@@ -1,6 +1,7 @@
 /* MC interface: definitions that non-MC modules must see, but not the user */
 
-/* Copyright (c) 2014-2015. The SimGrid Team.  All rights reserved.         */
+/* Copyright (c) 2014-2015. The SimGrid Team.
+ * All rights reserved.                                                     */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -14,6 +15,9 @@
 
 #include <xbt/mmalloc.h>
 
+#define SOFT_DIRTY_BIT_NUMBER 55
+#define SOFT_DIRTY (((uint64_t)1) << SOFT_DIRTY_BIT_NUMBER)
+
 using simgrid::mc::remote;
 
 namespace simgrid {
@@ -26,7 +30,8 @@ namespace mc {
  *  @return                Snapshot page numbers of this new snapshot
  */
 PerPageCopy::PerPageCopy(PageStore& store, AddressSpace& as,
-    remote_ptr<void> addr, std::size_t page_count)
+    remote_ptr<void> addr, std::size_t page_count,
+    const size_t* ref_page_numbers, const std::uint64_t* pagemap)
 {
   store_ = &store;
   this->pagenos_.resize(page_count);
@@ -34,6 +39,13 @@ PerPageCopy::PerPageCopy(PageStore& store, AddressSpace& as,
 
   for (size_t i = 0; i != page_count; ++i) {
 
+    // We don't have to compare soft-clean pages:
+    if (ref_page_numbers && pagemap && !(pagemap[i] & SOFT_DIRTY)) {
+      pagenos_[i] = ref_page_numbers[i];
+      store_->ref_page(ref_page_numbers[i]);
+      continue;
+    }
+
       remote_ptr<void> page = remote(addr.address() + (i << xbt_pagebits));
       xbt_assert(mc_page_offset((void*)page.address())==0,
         "Not at the beginning of a page");