Date: Thu, 30 Sep 2021 10:50:56 -0400 From: Fangrui Song <emacsray@...il.com> To: musl@...ts.openwall.com Subject: Re: Mallocng algorithm high-level overview On Thu, Sep 30, 2021 at 10:02 AM Jack Bond-Preston <jack.bond-preston@....com> wrote: > > 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? Not answering the specific questions below, but I have some notes on https://gist.github.com/MaskRay/ac54b26d72452ac77ac578f2e625369f :) > 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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