site_archiver@lists.apple.com Delivered-To: darwin-kernel@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@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@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... 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@mu.org This email sent to site_archiver@lists.apple.com