I will upgrade to dev version of jemalloc. Thanks for the quick input. On Tue, Jan 20, 2015 at 10:31 PM, Jason Evans <[email protected]> wrote:
> On Jan 20, 2015, at 5:17 AM, SNL <[email protected]> wrote: > > 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. > > The features you're trying to use only exist in the dev version of > jemalloc so far ("arena.<i>.chunk.alloc" and "arena.<i>.chunk.dalloc" > mallctl interfaces). Note that related control over dirty page purging > still needs to be implemented ( > https://github.com/jemalloc/jemalloc/issues/93). > > Jason -- Cheers, Sunny.
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