Date: Fri, 19 Oct 2007 13:48:42 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: arch@freebsd.org, "Constantine A. Murenin" <cnst@freebsd.org> Subject: Re: sensors fun.. Message-ID: <20071019134842.rhlnbcqrbc4sc4o4@webmail.leidinger.net> In-Reply-To: <81952.1192786864@critter.freebsd.dk> References: <81952.1192786864@critter.freebsd.dk>
next in thread | previous in thread | raw e-mail | index | archive | help
Quoting Poul-Henning Kamp <phk@phk.freebsd.dk> (from Fri, 19 Oct 2007 09:41:04 +0000): > In message <20071019113444.xinyc37x9cg0ckk0@webmail.leidinger.net>, > Alexander L > eidinger writes: > >> I was thinking you talk about the interface between the kernel and the >> userland. Now I think that you talk more or less about something which >> could be implemented e.g., as an userland library which not only polls >> the kernel sensors framework, but provides the single-system sensor >> data (and could be a base of a singe-system sensor daemon which feeds >> its data to a group-level sensors framework). Does this sound like >> what you have in mind? > > It certainly sounds more sensible. More sensible than what? > The kernel-userland interface should happen over a filedescriptor > (either device or unix-domain socket) so that whatever daemon we > park on the fd can just use select/poll/kqueue to wait for events. Please explain a little bit more of this architecture regarding the following questions: What to do with sensors which aren't event based or don't have a predefined polling interval (e.g., temperature and humidity)? What do you think will the ratio be between the amount of sensors with and without something like this? How is the kernel supposed to know what polling policy the user is interested in (every 5sec/every minute/every 5 minutes/whatever)? Why should this policy/procedure life in the kernel? Bye, Alexander. -- Two heads are better than one. -- John Heywood http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20071019134842.rhlnbcqrbc4sc4o4>