#include "mem/abstract_mem.hh"
#include "mem/physical.hh"
+/**
+ * On Linux, MAP_NORESERVE allow us to simulate a very large memory
+ * without committing to actually providing the swap space on the
+ * host. On OSX the MAP_NORESERVE flag does not exist, so simply make
+ * it 0.
+ */
+#if defined(__APPLE__)
+#ifndef MAP_NORESERVE
+#define MAP_NORESERVE 0
+#endif
+#endif
+
using namespace std;
PhysicalMemory::PhysicalMemory(const string& _name,
- const vector<AbstractMemory*>& _memories) :
- _name(_name), rangeCache(addrMap.end()), size(0)
+ const vector<AbstractMemory*>& _memories,
+ bool mmap_using_noreserve) :
+ _name(_name), rangeCache(addrMap.end()), size(0),
+ mmapUsingNoReserve(mmap_using_noreserve)
{
+ if (mmap_using_noreserve)
+ warn("Not reserving swap space. May cause SIGSEGV on actual usage\n");
+
// add the memories from the system to the address map as
// appropriate
for (const auto& m : _memories) {
DPRINTF(AddrRanges, "Creating backing store for range %s with size %d\n",
range.to_string(), range.size());
int map_flags = MAP_ANON | MAP_PRIVATE;
+
+ // to be able to simulate very large memories, the user can opt to
+ // pass noreserve to mmap
+ if (mmapUsingNoReserve) {
+ map_flags |= MAP_NORESERVE;
+ }
+
uint8_t* pmem = (uint8_t*) mmap(NULL, range.size(),
PROT_READ | PROT_WRITE,
map_flags, -1, 0);
}
void
-PhysicalMemory::serialize(ostream& os)
+PhysicalMemory::serialize(CheckpointOut &cp) const
{
// serialize all the locked addresses and their context ids
vector<Addr> lal_addr;
- vector<int> lal_cid;
+ vector<ContextID> lal_cid;
for (auto& m : memories) {
const list<LockedAddr>& locked_addrs = m->getLockedAddrList();
}
}
- arrayParamOut(os, "lal_addr", lal_addr);
- arrayParamOut(os, "lal_cid", lal_cid);
+ SERIALIZE_CONTAINER(lal_addr);
+ SERIALIZE_CONTAINER(lal_cid);
// serialize the backing stores
unsigned int nbr_of_stores = backingStore.size();
unsigned int store_id = 0;
// store each backing store memory segment in a file
for (auto& s : backingStore) {
- nameOut(os, csprintf("%s.store%d", name(), store_id));
- serializeStore(os, store_id++, s.first, s.second);
+ ScopedCheckpointSection sec(cp, csprintf("store%d", store_id));
+ serializeStore(cp, store_id++, s.first, s.second);
}
}
void
-PhysicalMemory::serializeStore(ostream& os, unsigned int store_id,
- AddrRange range, uint8_t* pmem)
+PhysicalMemory::serializeStore(CheckpointOut &cp, unsigned int store_id,
+ AddrRange range, uint8_t* pmem) const
{
// we cannot use the address range for the name as the
// memories that are not part of the address map can overlap
SERIALIZE_SCALAR(range_size);
// write memory file
- string filepath = Checkpoint::dir() + "/" + filename.c_str();
+ string filepath = CheckpointIn::dir() + "/" + filename.c_str();
gzFile compressed_mem = gzopen(filepath.c_str(), "wb");
if (compressed_mem == NULL)
fatal("Can't open physical memory checkpoint file '%s'\n",
}
void
-PhysicalMemory::unserialize(Checkpoint* cp, const string& section)
+PhysicalMemory::unserialize(CheckpointIn &cp)
{
// unserialize the locked addresses and map them to the
// appropriate memory controller
vector<Addr> lal_addr;
- vector<int> lal_cid;
- arrayParamIn(cp, section, "lal_addr", lal_addr);
- arrayParamIn(cp, section, "lal_cid", lal_cid);
+ vector<ContextID> lal_cid;
+ UNSERIALIZE_CONTAINER(lal_addr);
+ UNSERIALIZE_CONTAINER(lal_cid);
for(size_t i = 0; i < lal_addr.size(); ++i) {
const auto& m = addrMap.find(lal_addr[i]);
m->second->addLockedAddr(LockedAddr(lal_addr[i], lal_cid[i]));
UNSERIALIZE_SCALAR(nbr_of_stores);
for (unsigned int i = 0; i < nbr_of_stores; ++i) {
- unserializeStore(cp, csprintf("%s.store%d", section, i));
+ ScopedCheckpointSection sec(cp, csprintf("store%d", i));
+ unserializeStore(cp);
}
}
void
-PhysicalMemory::unserializeStore(Checkpoint* cp, const string& section)
+PhysicalMemory::unserializeStore(CheckpointIn &cp)
{
const uint32_t chunk_size = 16384;
string filename;
UNSERIALIZE_SCALAR(filename);
- string filepath = cp->cptDir + "/" + filename;
+ string filepath = cp.cptDir + "/" + filename;
// mmap memoryfile
gzFile compressed_mem = gzopen(filepath.c_str(), "rb");