Date: Thu, 30 Sep 2021 15:02:23 +0100 From: Jack Bond-Preston <jack.bond-preston@....com> To: musl@...ts.openwall.com Subject: Mallocng algorithm high-level overview Hello, I'm currently working on porting mallocng to a new architecture and could use some assistance understanding the algorithm. From searching the web, I couldn't seem to find any high-level overview of musl's mallocng allocator (save for the readme at github/richfelker /mallocng-draft, which is a little briefer than what I am looking for). If any such description exists, I would much appreciate being pointed towards it. If not, would anyone be able to explain some of the details of the allocator? Mostly I am interested in a more general high-level overview of how the allocator works. There are also some specifics I am interested in, if anyone is able to shine some light on these: - The uses/purposes of the structures in meta.h. Particularly, meta and group, and the relation between the two. - The general overview of in-band and out-of-band metadata, and how/ when they are used. - The purpose/meaning of the UNIT define in meta.h. - Any assumptions about alignment/pointer size the allocator may make. Thanks very much for your time, I appreciate the request is a bit broad, but any information is appreciated. Please don't hesitate to reach out for more information. Cheers, Jack
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