X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/c45a236d5837894e3e9b9ae68d675c8dbc863eb7..a957c8903c9dd13041a0902b130f0e6543388ca2:/src/mc/ChunkedData.cpp

diff --git a/src/mc/ChunkedData.cpp b/src/mc/ChunkedData.cpp
index 00f6e31e2b..4c94d7c025 100644
--- a/src/mc/ChunkedData.cpp
+++ b/src/mc/ChunkedData.cpp
@@ -1,27 +1,31 @@
-/* Copyright (c) 2007-2015. The SimGrid Team.
- * All rights reserved.                                                     */
+/* Copyright (c) 2007-2018. 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. */
 
+#include <cstddef>
+#include <cstdint>
 
-#include "src/mc/ChunkedData.hpp"
+#include <vector>
+
+#include "xbt/asserts.h"
+#include "xbt/misc.h"
 
-#define SOFT_DIRTY_BIT_NUMBER 55
-#define SOFT_DIRTY (((uint64_t)1) << SOFT_DIRTY_BIT_NUMBER)
+#include "src/mc/AddressSpace.hpp"
+#include "src/mc/ChunkedData.hpp"
+#include "src/mc/PageStore.hpp"
 
 namespace simgrid {
 namespace mc {
 
 /** Take a per-page snapshot of a region
  *
- *  @param data            The start of the region (must be at the beginning of a page)
- *  @param pag_count       Number of pages of the region
+ *  @param addr            The start of the region (must be at the beginning of a page)
+ *  @param page_count      Number of pages of the region
  *  @return                Snapshot page numbers of this new snapshot
  */
 ChunkedData::ChunkedData(PageStore& store, AddressSpace& as,
-    remote_ptr<void> addr, std::size_t page_count,
-    const std::size_t* ref_page_numbers, const std::uint64_t* pagemap)
+    RemotePtr<void> addr, std::size_t page_count)
 {
   store_ = &store;
   this->pagenos_.resize(page_count);
@@ -29,28 +33,20 @@ ChunkedData::ChunkedData(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,
+      RemotePtr<void> page = remote((void*)
+        simgrid::mc::mmu::join(i, addr.address()));
+      xbt_assert(simgrid::mc::mmu::split(page.address()).second == 0,
         "Not at the beginning of a page");
 
-        /* Adding another copy (and a syscall) will probably slow things a lot.
-           TODO, optimize this somehow (at least by grouping the syscalls)
-           if needed. Either:
-            - reduce the number of syscalls;
-            - let the application snapshot itself;
-            - move the segments in shared memory (this will break `fork` however).
-        */
-
-        as.read_bytes(
-          buffer.data(), xbt_pagesize, page,
-          simgrid::mc::ProcessIndexDisabled);
+      /* Adding another copy (and a syscall) will probably slow things a lot.
+         TODO, optimize this somehow (at least by grouping the syscalls)
+         if needed. Either:
+         - reduce the number of syscalls
+         - let the application snapshot itself
+         - move the segments in shared memory (this will break `fork` however)
+      */
+
+      as.read_bytes(buffer.data(), xbt_pagesize, page, simgrid::mc::ProcessIndexDisabled);
 
       pagenos_[i] = store_->store_page(buffer.data());