Just use default allocator unless there is anything special.
@@ -375,7 +375,7 @@ size_t computeBufLen(size_t buflen)
Fast_BufferedFile::Fast_BufferedFile(FastOS_FileInterface *file, size_t bufferSize) :
FastOS_FileInterface(),
_fileleft(static_cast<uint64_t>(-1)),
- _buf(vespalib::alloc::Alloc::allocMMap(computeBufLen(bufferSize))),
+ _buf(vespalib::alloc::Alloc::alloc(computeBufLen(bufferSize))),
_bufi(nullptr),
_bufe(nullptr),
_filepos(0),
