From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: CE Linux Forum PM Requierments WiKi is available for review and comment. Date: Wed, 22 Mar 2006 10:41:27 +0100 Message-ID: <20060322094127.GH14075@elf.ucw.cz> References: <5389061B65D50446B1783B97DFDB392D2042B3@orsmsx411.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============37755284245323217==" Return-path: In-Reply-To: <5389061B65D50446B1783B97DFDB392D2042B3@orsmsx411.amr.corp.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-pm-bounces@lists.osdl.org Errors-To: linux-pm-bounces@lists.osdl.org To: "Gross, Mark" Cc: linux-pm@osdl.org, PMWG@LIST.CELINUXFORUM.ORG, mli_tech@groups.osdl.org, celinux-dev@tree.celinuxforum.org List-Id: linux-pm@vger.kernel.org --===============37755284245323217== Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi! > >Hmm, okay, yes, that would be useful for machines that can't do > >throttling in hardware. > > Even platforms that can throttle in hardware, it could make sense for to > throttle the OS. Well, certainly. If you want to throttle to 1% and hardware can only throttle to 30%, you need to do it in software. > I think a person may want to throttle what work a laptop is doing as a > function of being tethered or remaining battery life. If all you want > to do is finish those last few edits to a file before your battery cuts > you off for the rest of a long flight, you will be very willing to shut > down most (all?) processing that's not related to what you are editing. > Cron jobs, automatic spell checking, sound subsystems, screen savers, > pretty much anything not related to your editing will pull down your > battery. Most of these can be shut down from user mode, some things may > be easier to implement robustly with some kernel support. That will be userland parts, I'd say. > One idea is to extend the SCHED_BATCH idea to know about power state to > avoid running some things when un-tethered or under low battery > conditions. Idle thread with realtime priority could do parts of what you want. > >> >Thanks, Sharp! > >> > >> Who the heck is Sharp, and why do you always thank him? > > > >That's a signature... Sharp is Japaneese firm, maybe you've heard > >about them :-). Send me handheld computer, and that line becomes > >"Thanks, Intel" ;-). > > Oh! Ok, that makes sense. BTW careful what you wish for.... Well, I currently have collie (sharp sl-5500) for hacking, and spitz (c-3000) for normal use. I would not mind hacking on something not as obsolete. Pavel -- Picture of sleeping (Linux) penguin wanted... --===============37755284245323217== Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline --===============37755284245323217==--