Function Madvise

util/system/madvise.cpp:24–42

namespace {
    void Madvise(int flag, const void* cbegin, size_t size) {
        static const size_t pageSize = NSystemInfo::GetPageSize();
        void* begin = AlignDown(const_cast<void*>(cbegin), pageSize);
        size = AlignUp(size, pageSize);

#if defined(_win_)
        if (!VirtualFree((LPVOID)begin, size, flag)) {
            TString err(LastSystemErrorText());
            ythrow yexception() << "VirtualFree(" << begin << ", " << size << ", " << flag << ")"
                                << " returned error: " << err;
        }
#else
        if (-1 == madvise(begin, size, flag)) {
            TString err(LastSystemErrorText());
            ythrow yexception() << "madvise(" << begin << ", " << size << ", " << flag << ")"
                                << " returned error: " << err;
        }
#endif
    }
} // namespace

void MadviseSequentialAccess(const void* begin, size_t size) {