/* 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 <sys/mman.h>
+
#include "mc/mc.h"
#include "mc_snapshot.h"
-#include "RegionSnapshot.hpp"
+
+#include <mc/ChunkedData.hpp>
+#include <mc/RegionSnapshot.hpp>
extern "C" {
}
}
+void data_deleter::operator()(void* p) const
+{
+ switch(type_) {
+ case Free:
+ free(p);
+ break;
+ case Munmap:
+ munmap(p, size_);
+ break;
+ }
+}
+
RegionSnapshot dense_region(
RegionType region_type,
void *start_addr, void* permanent_addr, size_t size)
{
- std::vector<char> data(size);
- mc_model_checker->process().read_bytes(data.data(), size,
+ simgrid::mc::RegionSnapshot::flat_data_ptr data;
+ if (!_sg_mc_ksm)
+ data = simgrid::mc::RegionSnapshot::flat_data_ptr((char*) malloc(size));
+ else {
+ char* ptr = (char*) mmap(nullptr, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_POPULATE, -1, 0);
+ if (ptr == MAP_FAILED)
+ throw std::bad_alloc();
+ simgrid::mc::data_deleter deleter(
+ simgrid::mc::data_deleter::Munmap, size);
+ data = simgrid::mc::RegionSnapshot::flat_data_ptr(ptr, deleter);
+ }
+ mc_model_checker->process().read_bytes(data.get(), size,
remote(permanent_addr),
simgrid::mc::ProcessIndexDisabled);
+ if (_sg_mc_ksm)
+ // Mark the region as mergeable *after* we have written into it.
+ // There no point to let KSM do the hard work before that.
+ madvise(data.get(), size, MADV_MERGEABLE);
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().data(), permanent_addr, size);
+ to_cstr(region_type), region.flat_data(), permanent_addr, size);
return std::move(region);
}
* @param size Size of the data*
*/
RegionSnapshot region(
- RegionType type, void *start_addr, void* permanent_addr, size_t size)
+ RegionType type, void *start_addr, void* permanent_addr, size_t size,
+ RegionSnapshot const* ref_region)
{
if (_sg_mc_sparse_checkpoint) {
- return sparse_region(type, start_addr, permanent_addr, size);
+ return sparse_region(type, start_addr, permanent_addr, size, ref_region);
} 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)
+ void *start_addr, void* permanent_addr, size_t size,
+ RegionSnapshot const* ref_region)
{
simgrid::mc::Process* process = &mc_model_checker->process();
+ bool use_soft_dirty = _sg_mc_sparse_checkpoint && _sg_mc_soft_dirty
+ && ref_region != nullptr
+ && ref_region->storage_type() == simgrid::mc::StorageType::Chunked;
+
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 = mc_page_count(size);
- simgrid::mc::PerPageCopy page_data(mc_model_checker->page_store(), *process,
- permanent_addr, page_count);
+ std::vector<std::uint64_t> pagemap;
+ const size_t* ref_page_numbers = nullptr;
+ if (use_soft_dirty) {
+ pagemap.resize(page_count);
+ process->read_pagemap(pagemap.data(),
+ mc_page_number(nullptr, permanent_addr), page_count);
+ ref_page_numbers = ref_region->page_data().pagenos();
+ }
+
+ simgrid::mc::ChunkedData page_data(
+ mc_model_checker->page_store(), *process, permanent_addr, page_count,
+ ref_page_numbers,
+ use_soft_dirty ? pagemap.data() : nullptr);
simgrid::mc::RegionSnapshot region(
region_type, start_addr, permanent_addr, size);