1 /* Copyright (c) 2014-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 /* MC interface: definitions that non-MC modules must see, but not the user */
8 #include <unistd.h> // pread, pwrite
10 #include "src/mc/mc_mmu.hpp"
11 #include "src/mc/mc_private.hpp"
12 #include "src/mc/sosp/PageStore.hpp"
13 #include "src/mc/sosp/mc_snapshot.hpp"
15 #include "src/mc/sosp/ChunkedData.hpp"
16 #include <xbt/mmalloc.h>
18 using simgrid::mc::remote;
20 /** @brief Restore a snapshot of a region
22 * If possible, the restoration will be incremental
23 * (the modified pages will not be touched).
26 * @param page_count Number of pages of the region
29 void mc_restore_page_snapshot_region(simgrid::mc::RemoteClient* process, void* start_addr,
30 simgrid::mc::ChunkedData const& pages_copy)
32 for (size_t i = 0; i != pages_copy.page_count(); ++i) {
33 // Otherwise, copy the page:
34 void* target_page = (void*)simgrid::mc::mmu::join(i, (std::uintptr_t)start_addr);
35 const void* source_page = pages_copy.page(i);
36 process->write_bytes(source_page, xbt_pagesize, remote(target_page));
40 // ***** High level API
42 void mc_region_restore_sparse(simgrid::mc::RemoteClient* process, mc_mem_region_t reg)
44 xbt_assert(((reg->permanent_address().address()) & (xbt_pagesize - 1)) == 0, "Not at the beginning of a page");
45 xbt_assert(simgrid::mc::mmu::chunkCount(reg->size()) == reg->page_data().page_count());
46 mc_restore_page_snapshot_region(process, (void*)reg->permanent_address().address(), reg->page_data());