Hi, Here is what I am doing currently:
1. I am trying to carve out 10 MB memory area at the higher end of process address space using mmap (MAP_FIXED..). 2. I created a new arena using arenas.extend mallctl 3. I am using mallocx/dallocx with MALLOCX_ARENA(arena) as documented. The issue is how do I connect the arena to mmaped memory chunk ? I see that new arena never gets initialized and all allocations continue to happen from arena 0x0. I thought thread.arena mallctl will connect the arena to mmapped chunk but it just creates a thread <-> arena mapping. I looked at the sources to see if there is any other mallctl to create this association but there does not seem to be any, what am I missing here ? And older sample program I found on this mailing list, uses following mallctl which is not supported in jemalloc 3.6. snprintf(path, sizeof(path), "arena.%u.chunk.alloc", _arena); ret = __svm_mallctl(path, (void*)&_chunk_alloc, &sz, (void*)&_chunk_alloc, sizeof(void *)); assert (ret == 0); snprintf(path, sizeof(path), "arena.%u.chunk.dalloc", _arena); ret = __svm_mallctl(path, (void*)&_chunk_dalloc, &sz, (void*)&_chunk_dalloc, sizeof(void *)); assert (ret == 0); This basically is asking jemalloc to callback user defined functions, is this functionality still available in jemalloc ? Any inputs will be helpful. Thanks.
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