<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hello, Is it possible to allocate memory in a defined region, specifically anywhere above the first 2GB? I see that mallocx with <meta charset="utf-8"> ALLOCM_ALIGN allows one to specify a base address aligned to a power of 2. Can I grab a bunch of memory that way and somehow tell an arena to use that space and then always mallocx with that arena? I'm in the midst of writing a LuaJIT [1] binding to jemalloc, and have successfully allocated memory aligned to 2^31 but can't figure out the next step -- short of writing my own allocator to dole out jemalloc-allocated memory. Context: LuaJIT, a Lua Just-In-Time compiler, can itself only allocate memory in the lower portions of memory (<1GB, <2GB, <4GB depending on platform). One can get around this limitation by using its FFI to allocate memory for FFI-bound C structures, however allocating these in the lower regions effectively "steals" available memory from the LuaJIT VM for Lua objects. I want to ensure maximum available memory for the LuaJIT by allocating all my objects outside this area. Thanks, Evan [1] <a class="moz-txt-link-freetext" href="http://www.luajit.org">http://www.luajit.org</a> </body> </html>