mem_pool.cc

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#include "sim/mem_pool.hh"
 
#include "base/addr_range.hh"
#include "base/logging.hh"
 
namespace gem5
{
 
MemPool::MemPool(Addr page_shift, Addr ptr, Addr limit)
        : pageShift(page_shift), startPageNum(ptr >> page_shift),
        _totalPages((limit - ptr) >> page_shift),
        freePhysPages(startPageNum, _totalPages)
{
}
 
Counter
MemPool::startPage() const
{
    return startPageNum;
}
 
Counter
MemPool::totalPages() const
{
    return _totalPages;
}
 
Counter
MemPool::allocatedPages() const
{
    return totalPages() - freePages();
}
 
Counter
MemPool::freePages() const
{
    return freePhysPages.size();
}
 
Addr
MemPool::startAddr() const
{
    return startPage() << pageShift;
}
 
Addr
MemPool::allocatedBytes() const
{
    return allocatedPages() << pageShift;
}
 
Addr
MemPool::freeBytes() const
{
    return freePages() << pageShift;
}
 
Addr
MemPool::totalBytes() const
{
    return totalPages() << pageShift;
}
 
Addr
MemPool::allocate(Addr npages)
{
    const std::optional<Addr> page = freePhysPages.allocate(npages);
    if (!page)
        fatal("Out of memory, please increase size of physical memory.");
    return *page << pageShift;
}
 
void
MemPool::deallocate(Addr dealloc_start, Addr dealloc_npages)
{
    freePhysPages.insert(dealloc_start >> pageShift, dealloc_npages);
}
 
void
MemPool::serialize(CheckpointOut &cp) const
{
    paramOut(cp, "page_shift", pageShift);
    paramOut(cp, "start_page", startPageNum);
    paramOut(cp, "total_pages", _totalPages);
 
    ScopedCheckpointSection sec(cp, "free_list");
    paramOut(cp, "size", freePhysPages.ranges().size());
    int i = 0;
    for (const auto& range : freePhysPages.ranges()) {
        ScopedCheckpointSection sec(cp, csprintf("free%d", i++));
        paramOut(cp, "base", range.base);
        paramOut(cp, "size", range.size);
    }
}
 
void
MemPool::unserialize(CheckpointIn &cp)
{
    paramIn(cp, "page_shift", pageShift);
    paramIn(cp, "start_page", startPageNum);
    paramIn(cp, "total_pages", _totalPages);
 
    Counter free_page_num;
    if (optParamIn(cp, "free_page_num", free_page_num)) {
        // Handle checkpoints generated by legacy page allocator
        // for backwards compatibility.
        warn("Checkpoint contains legacy MemPool state (free_page_num)\n");
        freePhysPages.insert(free_page_num, _totalPages - free_page_num);
    } else {
        ScopedCheckpointSection sec(cp, "free_list");
        int n = 0;
        optParamIn(cp, "size", n);
        for (int i = 0; i < n; ++i) {
            ScopedCheckpointSection sec(cp, csprintf("free%d", i));
            Addr base;
            Addr size;
            paramIn(cp, "base", base);
            paramIn(cp, "size", size);
            freePhysPages.insert(base, size);
        }
    }
}
 
void
MemPools::populate(const AddrRangeList &memories)
{
    for (const auto &mem : memories)
        pools.emplace_back(pageShift, mem.start(), mem.end());
}
 
Addr
MemPools::allocPhysPages(int npages, int pool_id)
{
    return pools[pool_id].allocate(npages);
}
 
void
MemPools::deallocPhysPages(Addr page_addr, int npages, int pool_id)
{
    pools[pool_id].deallocate(page_addr, npages);
}
 
Addr
MemPools::memSize(int pool_id) const
{
    return pools[pool_id].totalBytes();
}
 
Addr
MemPools::freeMemSize(int pool_id) const
{
    return pools[pool_id].freeBytes();
}
 
void
MemPools::serialize(CheckpointOut &cp) const
{
    ScopedCheckpointSection sec(cp, "mempools");
    int num_pools = pools.size();
    SERIALIZE_SCALAR(num_pools);
 
    for (int i = 0; i < num_pools; i++)
        pools[i].serializeSection(cp, csprintf("pool%d", i));
}
 
void
MemPools::unserialize(CheckpointIn &cp)
{
    // Delete previous mem_pools
    pools.clear();
 
    ScopedCheckpointSection sec(cp, "mempools");
    int num_pools = 0;
    UNSERIALIZE_SCALAR(num_pools);
 
    for (int i = 0; i < num_pools; i++) {
        MemPool pool;
        pool.unserializeSection(cp, csprintf("pool%d", i));
        pools.push_back(pool);
    }
}
 
} // namespace gem5