Messages in this thread | | | Date | Thu, 6 Jun 2002 13:40:19 -0500 (CDT) | From | Oliver Xymoron <> | Subject | Re: [rfc] "laptop mode" |
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On Wed, 5 Jun 2002, Andrew Morton wrote:
> Jens Axboe wrote: > > > > On Wed, Jun 05 2002, Xavier Bestel wrote: > > > Le mer 05/06/2002 à 01:43, Andrew Morton a écrit : > > > > > > > Also, it has been suggested that the feature become more fully-fleshed, > > > > to support desktops with one disk spun down, etc. It's not really > > > > rocket science to do that - the `struct backing_dev_info' gives > > > > a specific communication channel between the high-level VFS code and > > > > the request queue. But that would require significantly more surgery > > > > against the writeback code, so I'm fishing for requirements here. If > > > > the current (simple) patch is sufficient then, well, it is sufficient. > > > > > > Have per-disk laptop-mode, so that some user-mode proggy (e.g. hotplug) > > > could decide what to do. > > > > And get rid of disk_spun_up(), make it a queue flag instead and signal > > the spin up before calling the request_fn instead of shoving it inside > > the driver request_fn's. > > Then writes to the ramdisk would cause a spinup. > > Yes, it could be per-queue. That would add complexity to > the already-murky fs/fs-writeback.c. It that justifiable?
Yes, see Zip and USB/Firewire drives. Laptops can have multiple spindles.
-- "Love the dolphins," she advised him. "Write by W.A.S.T.E.."
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