+++ /dev/null
-/* 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 <cstdlib>
-
-#include <sys/mman.h>
-#ifdef __FreeBSD__
-# define MAP_POPULATE MAP_PREFAULT_READ
-#endif
-
-#include "mc/mc.h"
-#include "src/mc/mc_config.hpp"
-#include "src/mc/mc_snapshot.hpp"
-
-#include "src/mc/ChunkedData.hpp"
-#include "src/mc/RegionSnapshot.hpp"
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_RegionSnaphot, mc,
- "Logging specific to region snapshots");
-
-namespace simgrid {
-namespace mc {
-
-static inline
-const char* to_cstr(RegionType region)
-{
- switch (region) {
- case RegionType::Unknown:
- return "unknown";
- case RegionType::Heap:
- return "Heap";
- case RegionType::Data:
- return "Data";
- default:
- return "?";
- }
-}
-
-Buffer::Buffer(std::size_t size, Type type) : size_(size), type_(type)
-{
- switch(type_) {
- case Type::Malloc:
- data_ = ::operator new(size_);
- break;
- case Type::Mmap:
- data_ = ::mmap(nullptr, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_POPULATE, -1, 0);
- if (data_ == MAP_FAILED) {
- data_ = nullptr;
- size_ = 0;
- type_ = Type::Malloc;
- throw std::bad_alloc();
- }
- break;
- default:
- abort();
- }
-}
-
-void Buffer::clear() noexcept
-{
- switch(type_) {
- case Type::Malloc:
- ::operator delete(data_);
- break;
- case Type::Mmap:
- if (munmap(data_, size_) != 0)
- abort();
- break;
- default:
- abort();
- }
- data_ = nullptr;
- size_ = 0;
- type_ = Type::Malloc;
-}
-
-RegionSnapshot dense_region(
- RegionType region_type,
- void *start_addr, void* permanent_addr, size_t size)
-{
- // When KSM support is enables, we allocate memory using mmap:
- // * we don't want to advise bits of the heap as mergable
- // * mmap gives data aligned on page boundaries which is merge friendly
- simgrid::mc::Buffer data;
- if (_sg_mc_ksm)
- data = Buffer::mmap(size);
- else
- data = Buffer::malloc(size);
-
- mc_model_checker->process().read_bytes(data.get(), size,
- remote(permanent_addr),
- simgrid::mc::ProcessIndexDisabled);
-
-#ifdef __linux__
- if (_sg_mc_ksm)
- // Mark the region as mergeable *after* we have written into it.
- // Trying to merge them before is useless/counterproductive.
- madvise(data.get(), size, MADV_MERGEABLE);
-#endif
-
- simgrid::mc::RegionSnapshot region(
- region_type, start_addr, permanent_addr, size);
- region.flat_data(std::move(data));
-
- XBT_DEBUG("New region : type : %s, data : %p (real addr %p), size : %zu",
- to_cstr(region_type), region.flat_data().get(), permanent_addr, size);
- return region;
-}
-
-/** @brief Take a snapshot of a given region
- *
- * @param type
- * @param start_addr Address of the region in the simulated process
- * @param permanent_addr Permanent address of this data (for privatized variables, this is the virtual address of the privatized mapping)
- * @param size Size of the data*
- */
-RegionSnapshot region(
- RegionType type, void *start_addr, void* permanent_addr, size_t size)
-{
- if (_sg_mc_sparse_checkpoint)
- return sparse_region(type, start_addr, permanent_addr, size);
- else
- return dense_region(type, start_addr, permanent_addr, size);
-}
-
-RegionSnapshot sparse_region(RegionType region_type,
- void *start_addr, void* permanent_addr, size_t size)
-{
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
- assert(process != nullptr);
-
- xbt_assert((((uintptr_t)start_addr) & (xbt_pagesize-1)) == 0,
- "Not at the beginning of a page");
- xbt_assert((((uintptr_t)permanent_addr) & (xbt_pagesize-1)) == 0,
- "Not at the beginning of a page");
- size_t page_count = simgrid::mc::mmu::chunkCount(size);
-
- simgrid::mc::ChunkedData page_data(mc_model_checker->page_store(), *process, RemotePtr<void>(permanent_addr),
- page_count);
-
- simgrid::mc::RegionSnapshot region(
- region_type, start_addr, permanent_addr, size);
- region.page_data(std::move(page_data));
- return region;
-}
-
-}
-}
