1 /* Copyright (c) 2007-2019. 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. */
10 #define MAP_POPULATE MAP_PREFAULT_READ
14 #include "src/mc/mc_config.hpp"
15 #include "src/mc/sosp/mc_snapshot.hpp"
17 #include "src/mc/sosp/ChunkedData.hpp"
18 #include "src/mc/sosp/RegionSnapshot.hpp"
20 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_RegionSnaphot, mc, "Logging specific to region snapshots");
25 RegionSnapshot dense_region(RegionType region_type, void* start_addr, void* permanent_addr, size_t size)
27 simgrid::mc::Buffer data = Buffer::malloc(size);
29 mc_model_checker->process().read_bytes(data.get(), size, remote(permanent_addr), simgrid::mc::ProcessIndexDisabled);
31 simgrid::mc::RegionSnapshot region(region_type, start_addr, permanent_addr, size);
32 region.flat_data(std::move(data));
34 XBT_DEBUG("New region : type : %s, data : %p (real addr %p), size : %zu",
35 (region_type == RegionType::Heap ? "Heap" : (region_type == RegionType::Data ? "Data" : "?")),
36 region.flat_data().get(), permanent_addr, size);
40 /** @brief Take a snapshot of a given region
43 * @param start_addr Address of the region in the simulated process
44 * @param permanent_addr Permanent address of this data (for privatized variables, this is the virtual address of the
46 * @param size Size of the data*
48 RegionSnapshot region(RegionType type, void* start_addr, void* permanent_addr, size_t size)
50 if (_sg_mc_sparse_checkpoint)
51 return sparse_region(type, start_addr, permanent_addr, size);
53 return dense_region(type, start_addr, permanent_addr, size);
56 RegionSnapshot sparse_region(RegionType region_type, void* start_addr, void* permanent_addr, size_t size)
58 simgrid::mc::RemoteClient* process = &mc_model_checker->process();
59 assert(process != nullptr);
61 xbt_assert((((uintptr_t)start_addr) & (xbt_pagesize - 1)) == 0, "Start address not at the beginning of a page");
62 xbt_assert((((uintptr_t)permanent_addr) & (xbt_pagesize - 1)) == 0,
63 "Permanent address not at the beginning of a page");
64 size_t page_count = simgrid::mc::mmu::chunk_count(size);
66 simgrid::mc::ChunkedData page_data(mc_model_checker->page_store(), *process, RemotePtr<void>(permanent_addr),
69 simgrid::mc::RegionSnapshot region(region_type, start_addr, permanent_addr, size);
70 region.page_data(std::move(page_data));
75 } // namespace simgrid