November 2002 - Darwin-kernel

Re: VM and Disk interfaces from a File System
by Quinn 30 Nov '02

30 Nov '02

At 21:51 +1100 28/11/02, Wally Crooze wrote: Any help would be great. If there is a document that explains this stuff and file systems on Mac OS X I would love to read it. I've looked at Inside Mac OS X's System Overview, Kernel Programming and User Porting Guide but are just confused which things are relevant to KEXTs or just the kernel. There is no documentation on this stuff, partly because there's no guarantee that we (Apple) can support the current plug-in interface in the long term. I have noticed that part of the disk interface the functions cluster_read and cluster_write, are there normal read and write functions or is cluster the default? What sort of file system are you porting? If it's a standard block storage based system that supports caching, then cluster_read/write is definitely the way to go. Also, you should call cluster_pagein/pageout in your VOP_PAGEIN/OUT routines. Note that the cluster routines actually do the I/O by calling your VOP_CMAP routine to map the file block to a disk block and your VOP_STRATEGY routine to do the actual I/O. S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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VM and Disk interfaces from a File System
by Wally Crooze 28 Nov '02

28 Nov '02

I'm attempting to port a file system to Mac OS X, but since I am new to darwin I am having trouble working out what interfaces that I can use to communicate to the VM and the Disk below. Could somebody explain the VM and Disk interfaces which I should use for a file system. Also, is it possible to tell the VM to flush a particular vnode (file) data out to disk so that I can force consistency between disk and memory when necessary? I have noticed that part of the disk interface the functions cluster_read and cluster_write, are there normal read and write functions or is cluster the default? Any help would be great. If there is a document that explains this stuff and file systems on Mac OS X I would love to read it. I've looked at Inside Mac OS X's System Overview, Kernel Programming and User Porting Guide but are just confused which things are relevant to KEXTs or just the kernel. Thanks. -- Wally Crooze +-------------------------------------------------------+ | ,-_|\ Wally Crooze <wallycrooze(a)pobox.com> | | / \ | | \_,-._/ | | v | +-------------------------------------------------------+ _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Dumb questions on KUNCUserNotifications.h
by Stéphane Sudre 27 Nov '02

27 Nov '02

I think I may do some really nasty thing in a Kext so before making something really stupid I have to ask something maybe stupid: 1st dumb question: ------------------ KUNCUserNotificationDisplayFromBundle Does this method work in 10.1 and 10.2 because the comment on this call is (both on 10.1 and 10.2 headers)? /* This function currently requires a bundle path, which kexts cannot currently get. In the future, the CFBundleIdentiofier of the kext will be pass in in place of the bundlePath. */ And what does the "bundlePath" thing means? That you need to set bundleIdentifier to be the BSD path to the bundle but that in a later version this could be incorrect? 2nd dumb question: ------------------ Is there some code in Darwin which shows the usage of this API? A Finder Search on xnu did not produce any encouraging results. ------------------ As a side note, I think there's a typo in this file in regards to the comments: #define kOpenPreferencePanel 1 /* runs the preferences with the foo.preference opened. foo.preference must exist in /System/Library/P references */ I think the real path is /System/Library/PreferencePanes and foo.preference is foo.prefPane. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: boot time
by Sean Fritz 22 Nov '02

22 Nov '02

developer.apple.com is your friend :) http://developer.apple.com/techpubs/macosx/Essentials/SystemOverview/ BootingLogin/index.html On Friday, November 22, 2002, at 10:35 AM, cocoadeveloper(a)netscape.net wrote: Hi, I am interested in knowing what the boot process is for darwin. Is there such a thing as a boot program in darwin? When does init come on, and when is the rc script called? Thank You very much. Tony __________________________________________________________________ The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/ns/browsers/download.jsp Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/ _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. -- Sean Fritz "Black holes are where God divided by zero." - Steven Wright _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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boot time
by cocoadeveloper＠netscape.net 22 Nov '02

22 Nov '02

Hi, I am interested in knowing what the boot process is for darwin. Is there such a thing as a boot program in darwin? When does init come on, and when is the rc script called? Thank You very much. Tony __________________________________________________________________ The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/ns/browsers/download.jsp Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/ _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Single server UNIX or multi-server?
by Justin C. Walker 17 Nov '02

17 Nov '02

On Saturday, November 16, 2002, at 04:33 PM, Evan Chaney wrote: Hi. I've been talking with a computer science professor at my university about Mac OS X and he asked me if the kernel was single server UNIX or multi-server. Can anyone help me out? I have no idea what he's talking about. =) Thanks. There's some confusion here, I think. The 'single-' vs. 'multi-' server issue arises because of the fact that Mac OS X uses Mach in its underpinnings (the Darwin OS). However, unlike the more 'academic' uses of Mach (ignoring OS/1), Mac OS X does not have a server-based OS. The Mach implementation is tightly integrated with the rest of the (BSD-based) OS, and there is no attempt to run operating systems as "server processes". Although Darwin/Mac OS X uses Mach 3.x, it is implemented in a way that is closer to Mach 2.x. That may help discuss this with your prof. Regards, Justin -- /~\ The ASCII Justin C. Walker, Curmudgeon-at-Large \ / Ribbon Campaign X Help cure HTML Email / \ _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Single server UNIX or multi-server?
by Evan Chaney 17 Nov '02

17 Nov '02

Hi. I've been talking with a computer science professor at my university about Mac OS X and he asked me if the kernel was single server UNIX or multi-server. Can anyone help me out? I have no idea what he's talking about. =) Thanks. Evan Chaney evanchaney(a)mac.com http://www.evanchaney.com _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Reactivating hdd from standby
by Matthias Kretschmer 16 Nov '02

16 Nov '02

Hello! So I hope this is the right list, because I think it's a device-driver related problem. The situation: having CD inserted. HDD is in standby mode (from power management facilities). Always, when the HDD is reactivated the CD-Rom is reactivated, too. So this is annoying when one wants not to remove a cd, but have it at hand. I first thought there is something about firmware or how ata is working, so I netbooted linux and netbsd from another boxed, mounted cd, switched down hdd/cd and reactivated hdd (by performing some cat /dev/diskdevice). On these systems is no such effect. So here is my environment: - iBook 12" 16MB VRam (600MHz G3) - Mac OS X 10.2.2 (no modified kernel or something, just plain system) - standard 20GB HDD, CD-Rom as prebuild by Apple -- Greetings Matthias Kretschmer _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Fwd: Performance problems under 10.2
by Tyler Ward 16 Nov '02

16 Nov '02

I tried rebooting, and then I had 277 megs of ram free. Then I ran setiathome again, and got the same result. I'm pretty sure that ram usage is not the problem. Seti never uses more than about 12 megs, and I always have at least 50 (and sometimes up to 250 megs free). My version of 10.2 is actually a clean install. I screwed up my partitioning (basically ran out of room on the one where I needed it) so I had to repartition and reinstall the OS. This was a problem before the repartitioning as well though, so it didn't start there. It started at (or near) the time that I upgraded to 10.2 In order to possibly clear up any questions about my system configuration I'm going to attach my system profiler file here. It's big, I know. Hopefully this won't upset anyone too much..... > --------------------------------------------------- > System Profile > --------------------------------------------------- > Software Overview: > > +---------------------------------------------------------------------- > + > | > | > | System version : Mac OS X 10.2.2 (6F21) > | > | Boot volume : OSX > | > | Kernel version : Darwin Kernel Version 6.2: Tue > Nov 5 22:00:03 PST 2002; root:xnu/xnu-344.12.2.obj~1/RELEASE_PPC | > | User name : Tyler Ward (tyler) > | > | > | > > +---------------------------------------------------------------------- > + > Hardware Overview: > > +---------------------------------------------------------------------- > + > | > | > | Machine speed : 450 MHz > | > | Bus speed : 100 MHz > | > | Number of processors : 1 > | > | L2 cache size : 1MB > | > | Machine model : Power Mac G4 Cube (version = > 2.9) | > | Boot ROM info : 4.1.9f1 > | > | Customer serial number : SG0331SA-K59-ff06 > | > | Sales order number : Not available > | > | > | > > +---------------------------------------------------------------------- > + I omitted the logs and frameworks, because they're even bigger.... Beyond that, I'm not sure what to do. This isn't really a problem for me, after all, what do I care how fast my seti client crunches work units. I'm not losing sleep over it. However, there are those that might care, and if this is an actual reproduceable bug it might be quite a big one. Who knows, maybe top's just misreporting everything. Now here's something interesting.... I'm going to use quoting to set off the data, this isn't really quoting from another email.... I watched it in top delta (sampling every three seconds to make sure top overhead is small) mode for awhile.... I found that it generally looks like this..... > 443 setiathome 80.0% 14:50.38 257 0/0 5/5 30/5 > 612 However the system mode percentage says 20% or so anyway. But as I was watching it, it suddenly jumped to this..... > 443 setiathome 91.4% 14:16.47 0 0/0 0/0 7343/0 > 678 Notice the 7343 BSD syscalls. That however appeared to have little effect on its use of system time. Apparently that never showed up in the ktrace because I never happened to be tracing when it went psycho. That's where all the missing syscalls are coming from apparently. But it doesn't seem to affect the system time percentage much, so that's apparently not the problem either. I actually did a ktrace on it while it was freaking out, apparently it goes into a semi-infinite loop calling 539 setiathome CALL getrusage(0,0xbffff6a8) 539 setiathome RET getrusage 0 539 setiathome CALL getrusage(0,0xbffff6a8) 539 setiathome RET getrusage 0 539 setiathome CALL getrusage(0,0xbffff6a8) 539 setiathome RET getrusage 0 I have about a thousand pages of that. :-) But I'm not sure that's really the problem either, though I reported it to setiathome anyway. Tyler Ward _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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kernel building - how to use doconf
by Heiko Panther 15 Nov '02

15 Nov '02

Hi all, I want to build my own 10.2 kernel with KDEBUG defined. I found out (reading conf/MASTER) that I need to run doconf.csh [kdebug] However, doconf complains: doconf.csh: no /etc/machine, specify machine type with -cpu doconf.csh: e.g. doconf.csh -cpu VAX CONFIGURATION What should I put there for Darwin? Any additional advice? Do I build the kernel just as usual after running doconf? Thanks for the help! Heiko Panther _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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