February 2005 - Darwin-kernel

Tiger and NDAs
by Quinn 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Greetings All <http://developer.apple.com/technicalsupport/index.html> Sorry. It's not my fault. Blame the lawyers. Share and Enjoy (but be careful about the "Share" part) -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This is a friendly reminder that Tiger is still under NDA, and will remain so until the product is released. If you have access to Tiger seeds, please abide by the terms of your NDA and keep any confidential information to yourself. Currently there is no discussion forum for Tiger kernel development because the NDA specifically excludes you from discussing Tiger with other developers, even if you know they have access to the Tiger seeds. >From time-to-time Apple folks will describe Tiger features. Most of what we talk about is covered on the public web site, and thus is not confidential information. In other cases we must make a difficult judgement call about what we can say without getting into trouble. If you desperately need to have your Tiger questions answered before Tiger ships, your only recourse is to ask DTS. This email sent to site_archiver(a)lists.apple.com

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Re: Memory Regions in Mach 3.0
by Quinn 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Mach 3 supports sparse memory allocation by using "Memory Regions" and I'm looking for some information on the structure of such memory regions. S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… At 14:28 +0100 10/1/05, Mr. K. D. Ritson wrote: Are you looking for information about the internal implementation, or the external API? o For the programming API I'd recommend the book "Programming Under Mach" (don't have a proper citation handy, I'm on a plane right now) and the documentation in the kernel source (xnu/osfmk/man). o I don't have a ready reference for information about the internal structure, although I'm sure you can find something on the net. I can answer specific questions, but I don't have time to write an summary from scratch. This email sent to site_archiver(a)lists.apple.com

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Re: Communicating from kernel extension to application?
by Quinn 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I still can't find TCPLogger. Searching the developer site only yields two results to documents mentioning the existence of TCPLogger, but nothing of TCPLogger itself. There must be something I'm missing here in terms of finding it. Where exactly is it? S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… At 21:36 -0500 9/1/05, Brian Kendall wrote: TCPLogger is not currently available publicly. We keep in under wraps because we're actively discouraging the development of BSD-based KEXT because of the binary compatibility concerns. These concerns will be resolved in Tiger, at which point we'll publish TCPLogger properly. If you want a copy of the current code, please write to <dts(a)apple.com> and we'll send it your way. This email sent to site_archiver(a)lists.apple.com

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Re: What is a CACHE_HIT event in fs_usage?
by Quinn 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… At 10:00 -0800 7/1/05, Richard Jackson wrote: I'm using the "fs_usage" utility to help me optimize my application's I/O calls, and I see a lot of events labeled "CACHE_HIT". Could someone explain what these are? (VM paging? File System caching?) This corresponds to the symbol DBG_CACHE_HIT_FAULT. It indicates that the process took a page fault but the page was found in the cache. [Mac OS X has a Unified Buffer Cache (between the file system and VM), so there's no distinction between VM and file system cache.] This is in contrast to "PAGE_IN" (DBG_PAGEIN_FAULT) which indicates that the system took a page fault that required a read from disk. To understand the exact logic, take a look at the vm_fault routine in "xnu/osfmk/vm/vm_fault.c". This email sent to site_archiver(a)lists.apple.com

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Re: UDF 2.0 Support, Hitachi DZMV550A Video Camera
by Quinn 01 Feb '05

01 Feb '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com <http://developer.apple.com/programs/> S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… At 9:39 -0600 29/12/04, Daryl Warkentin wrote: I understand the UDF source code has not been released. That's true. Our current UDF VFS plug-in contains code that we can't release under APSL. Will support for version 2.0 of the UDF file system be added soon? As Justin says, Apple generally doesn't comment on our future plans, modulo big marketing announcements such as Tiger. If not, can it be worked on by outsiders (i.e. me)? Well, that depends on exactly what you mean. If your want to improve /our/ UDF VFS plug-in, the answer is "No, because it's not open source." If you mean "Is it possible to write a UDF 2.0 VFS plug-in for Mac OS X?", the answer is "Yes, see below." At 13:12 -0600 30/12/04, chuck remes wrote: The driver model (IOKit) for darwin/OSX is sufficiently different from other OSs that doing a simple port as you describe is anything but simple. That's true, but not really relevant. UDF is not an I/O Kit driver, it's a VFS plug-in. Apple's VFS architecture (at least prior to Tiger) is very similar to the other BSDs, so it should be relatively simple to port a UDF driver from another BSD to Mac OS X. The drawback here is the binary compatibility story. BSD plug-ins (VFS and NKE) have a very poor binary compatibility story on current versions of Mac OS X. We are fixing that in Tiger, but that means that any VFS plug-in work that you do on 10.3 will have to be ported to Tiger. My advice is that, if you're planning to do VFS work, join ADC as a Select member, download the Tiger seed build, and start work on that. However, I should caution you that, as a third party developer, it's always unwise to start project where there's an obvious customer need in a large market that Apple is strongly committed to. This email sent to site_archiver(a)lists.apple.com

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