Date: Fri, 20 Mar 1998 16:16:11 -0600 From: Jonathan Lemon <jlemon@americantv.com> To: "John S. Dyson" <toor@dyson.iquest.net> Cc: Mike Smith <mike@smith.net.au>, perlsta@cs.sunyit.edu, hackers@FreeBSD.ORG Subject: Re: mremap? Message-ID: <19980320161611.64201@right.PCS> In-Reply-To: <199803202011.PAA17394@dyson.iquest.net>; from John S. Dyson on Mar 03, 1998 at 03:11:29PM -0500 References: <199803201638.IAA29607@dingo.cdrom.com> <199803202011.PAA17394@dyson.iquest.net>
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On Mar 03, 1998 at 03:11:29PM -0500, John S. Dyson wrote: > I was planning on implementing mremap. I am not sure of the api, but > it should be "easy" to implement with our current VM code. Think > of map entries as being the address space "chunks", and objects as being > the data repositorys. I want to foster others knowing how the code > works, so now I don't want to do it :-). It would take me about 4Hrs > to implement, and I want more people on the project to be able to > do this stuff. The initial learning curve is long, but after that, > there will be more people yet who know how the VM code works!!! :-). I have something similar to this, but slightly different: I want to be able to map part of an address space of one process into the address space of a different process, at a different location, resulting in shared memory between the processes. (Why? I wanted a "vm86" process, with 1MB mapped starting at address 0, and the same region mapped into the "control" process, at a different location.) EG: boolean_t vm_map_shared(smap, dmap, saddr, daddr, size) vm_map_t smap, dmap; vm_offset_t saddr, daddr; vm_size_t size; Would this type of routine be useful? -- Jonathan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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