October 2006 - Darwin-kernel

Re: Determining disk activity per volume
by Rick Mann 07 Oct '06

07 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 6, 2006, at 16:14 , Thulli wrote: Oooh! This might work very well. -- Rick _______________________________________________ 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.… Option 1. If you are interested only in read and write system calls and don't want to do polling, take a look at this. http://developer.apple.com/technotes/tn2005/tn2127.html. You need to write a kauth hook and user land client process. If the kauth hook kext could provide a device interface, then the user land client can block on a "read(/dev/yourKauthDevice)" and process what you read with no polling. Option 2. If you don't want to write a kext and still achieve results with NO polling, then take a look at this http://developer.apple.com/documentation/Performance/Conceptual/ FileSystem/Articles/TrackingChanges.html I think the latency here is very high, isn't it (hundreds of milliseconds to seconds)? This email sent to site_archiver(a)lists.apple.com

1 0

Re: Determining disk activity per volume
by Thulli 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:in-reply-to:references:mime-version:content-type:message-id:cc:content-transfer-encoding:from:subject:date:to:x-mailer; b=kvTeDfNhAB3suXAwrkPsrO1yTK6p9hVn/2KidFgYL5ZkVhNpQeFcstt07gXR2YCK36RjvbQi4zy1Z8zkrhLN60hFwGFgxnC6qQdrw+wF2XHxuvA3rDoYqVyXJx6bwWQkY7ezPqdQKt8bhySDignb4rTeoCXrqiECBgM2yWhWD5k= thanks, Thulli. On 06-Oct-06, at 10:02 AM, Rick Mann wrote: I have these requirements: a) Do not destabilize the OS b) Low system overhead c) Reasonably rapid update (> 10 fps) I'd appreciate any suggestions. Thanks! -- Rick _______________________________________________ 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.… >> determining when read or write functions are called. However, this polling approach doesn't strike me as very elegant. Option 1. If you are interested only in read and write system calls and don't want to do polling, take a look at this. http://developer.apple.com/technotes/tn2005/tn2127.html. You need to write a kauth hook and user land client process. If the kauth hook kext could provide a device interface, then the user land client can block on a "read(/dev/yourKauthDevice)" and process what you read with no polling. Option 2. If you don't want to write a kext and still achieve results with NO polling, then take a look at this http://developer.apple.com/documentation/Performance/Conceptual/ FileSystem/Articles/TrackingChanges.html Hi. I'd like to implement a disk activity indicator that lives in the menu bar. I'm looking for suggestions on how to determine when a particular a volume, device, or the filesystem (in decreasing order of desirability) is reading from or writing to a device. I've been looking at the fs_usage sources and sysctl() using KERN_KDREADTR, and determining when read or write functions are called. However, this polling approach doesn't strike me as very elegant. I suppose I could make the call 10 times each second, and then process the results, but it seems very unwieldy to do this. I also don't know much about KERN_KDREADTR, because I can't seem to find any documentation about it. 8 I'm trying to find the sources for sysctl(), but I don't know where to look (is there a way to look up the location of commands and functions?). _______________________________________________ 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/thullishah% 40gmail.com This email sent to thullishah(a)gmail.com This email sent to site_archiver(a)lists.apple.com

1 0

Re: Where is kdbg_control()?
by AgentM 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com If you're just surfing the source, use: http://fxr.watson.org/ -M _______________________________________________ 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.… Well, that's not what I meant by that question, I was referring to the source of kdbg_control, but...you bring up another question (sorry for what must be a very fundamental question). How do I just get all the source? Do I have to download each module separately? Do I download all the PPC, then add to that the Intel source? I finally found the cvs instructions (still cvs, huh? when will it move to Subversion, or HAH! Perforce...), but they seem to be quite lacking, and still seem to require that I painstakingly download each module. This email sent to site_archiver(a)lists.apple.com

1 0

Re: Determining disk activity per volume
by Arvind Dalvi 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=OYmVnR3lrwKiV6DZY5Dnwsm6xcPMSRxTiGd0u/aap/18EROA3WrNapGTQfLMFrAjxS50Ql1dYCmBWWzUR7r5IaSohEtm9IOF/UH7BPVPELbEeCI3f8aErAwN5MuQkBkfOHA9TfaXYg6zOtkf1KB2hAEL8IHCBX8h6VKy4sdhQUY= _______________________________________________ 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 email sent to site_archiver(a)lists.apple.com

1 0

Re: Where is kdbg_control()?
by Graham J Lee 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 6 Oct 2006, at 08:51, Rick Mann wrote: -- Graham J Lee http://www.thaesofereode.info/ _______________________________________________ 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.… How do I just get all the source? Do I have to download each module separately? Do I download all the PPC, then add to that the Intel source? I finally found the cvs instructions (still cvs, huh? when will it move to Subversion, or HAH! Perforce...), but they seem to be quite lacking, and still seem to require that I painstakingly download each module. If opendarwin still have an rsync server up, then you can download the various modules in a single rsync command. If they don't...well you can't ;-) Seems like it could be better... True. Having the whole caboodle in a svn repository with tags on each version - and a web frontend, and OMG ponies!1! - would be good... :-D This email sent to site_archiver(a)lists.apple.com

1 0

Re: Determining disk activity per volume
by Michael Smith 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Look at how iostat is implemented; this is the preferred interface. = Mike On Oct 5, 2006, at 7:02 PM, Rick Mann wrote: I have these requirements: a) Do not destabilize the OS b) Low system overhead c) Reasonably rapid update (> 10 fps) I'd appreciate any suggestions. Thanks! -- Rick _______________________________________________ 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/drivers%40mu.org _______________________________________________ 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.… http://www.opensource.apple.com/darwinsource/10.4.7.ppc/ system_cmds-336.1.5/iostat.tproj/ You don't want to know "when"; if there's something happening that's far more often than you want to be notified. 10fps is a bit aggressive for something that's really not very interesting most of the time. Hi. I'd like to implement a disk activity indicator that lives in the menu bar. I'm looking for suggestions on how to determine when a particular a volume, device, or the filesystem (in decreasing order of desirability) is reading from or writing to a device. I've been looking at the fs_usage sources and sysctl() using KERN_KDREADTR, and determining when read or write functions are called. However, this polling approach doesn't strike me as very elegant. I suppose I could make the call 10 times each second, and then process the results, but it seems very unwieldy to do this. I also don't know much about KERN_KDREADTR, because I can't seem to find any documentation about it. I'm trying to find the sources for sysctl(), but I don't know where to look (is there a way to look up the location of commands and functions?). This email sent to drivers(a)mu.org This email sent to site_archiver(a)lists.apple.com

1 0

Re: Where is kdbg_control()?
by Rick Mann 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Oct 6, 2006, at 00:24 , John Dalgliesh wrote: Thanks. Of course just after sending the email, I discovered it. Where is the source? Seems like it could be better... Thanks! -- Rick _______________________________________________ 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.… On Fri, 6 Oct 2006, Rick Mann wrote: I'm trying to learn how sysctl() with KERN_KDEBUG works, by reading the source for kern_sysctl(). It ends up calling kdbg_control(), but for the life of me I can't find that. JohnsMBP:~/Darwin/xnu-792 johnd$ grep -r kdbg_control * ... bsd/kern/kdebug.c:kdbg_control(int *name, u_int namelen, user_addr_t where, size_t *sizep) ... Where did you get the source for kern_sysctl? Anyway it's here: <http://www.opensource.apple.com/darwinsource/> Although the kernel (xnu) only seems to be present under PPC, hmmm.. Well, that's not what I meant by that question, I was referring to the source of kdbg_control, but...you bring up another question (sorry for what must be a very fundamental question). How do I just get all the source? Do I have to download each module separately? Do I download all the PPC, then add to that the Intel source? I finally found the cvs instructions (still cvs, huh? when will it move to Subversion, or HAH! Perforce...), but they seem to be quite lacking, and still seem to require that I painstakingly download each module. This email sent to site_archiver(a)lists.apple.com

1 0

Re: Where is kdbg_control()?
by John Dalgliesh 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com JohnsMBP:~/Darwin/xnu-792 johnd$ grep -r kdbg_control * ... bsd/kern/kdebug.c:kdbg_control(int *name, u_int namelen, user_addr_t where, size_t *sizep) ... Thanks! -- Rick No worries. {P^/ _______________________________________________ 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.… On Fri, 6 Oct 2006, Rick Mann wrote: I'm trying to learn how sysctl() with KERN_KDEBUG works, by reading the source for kern_sysctl(). It ends up calling kdbg_control(), but for the life of me I can't find that. Looks like it's in kdebug.c. I didn't search the latest xnu release but I'm pretty sure it'd be the same in the latest one. Is this stuff documented anywhere (other than the source)? I very much doubt it. There seems to be plenty of other stuff that needs documenting with higher priority than this. Where is the source? Where did you get the source for kern_sysctl? Anyway it's here: <http://www.opensource.apple.com/darwinsource/> Although the kernel (xnu) only seems to be present under PPC, hmmm.. This email sent to site_archiver(a)lists.apple.com

1 0

Where is kdbg_control()?
by Rick Mann 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thanks! -- Rick _______________________________________________ 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.… I'm trying to learn how sysctl() with KERN_KDEBUG works, by reading the source for kern_sysctl(). It ends up calling kdbg_control(), but for the life of me I can't find that. Is this stuff documented anywhere (other than the source)? Where is the source? This email sent to site_archiver(a)lists.apple.com

1 0

Determining disk activity per volume
by Rick Mann 06 Oct '06

06 Oct '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I have these requirements: a) Do not destabilize the OS b) Low system overhead c) Reasonably rapid update (> 10 fps) I'd appreciate any suggestions. Thanks! -- Rick _______________________________________________ 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.… Hi. I'd like to implement a disk activity indicator that lives in the menu bar. I'm looking for suggestions on how to determine when a particular a volume, device, or the filesystem (in decreasing order of desirability) is reading from or writing to a device. I've been looking at the fs_usage sources and sysctl() using KERN_KDREADTR, and determining when read or write functions are called. However, this polling approach doesn't strike me as very elegant. I suppose I could make the call 10 times each second, and then process the results, but it seems very unwieldy to do this. I also don't know much about KERN_KDREADTR, because I can't seem to find any documentation about it. I'm trying to find the sources for sysctl(), but I don't know where to look (is there a way to look up the location of commands and functions?). This email sent to site_archiver(a)lists.apple.com

1 0