Messages in this thread | | | Date | Tue, 24 Oct 2006 04:53:46 +0100 | From | Matthew Garrett <> | Subject | Re: Battery class driver. |
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On Tue, Oct 24, 2006 at 01:48:27PM +1000, Benjamin Herrenschmidt wrote: > On Tue, 2006-10-24 at 04:27 +0100, Matthew Garrett wrote:
> > Reading the battery status has the potential to call an SMI that might > > take an arbitrary period of time to return, and we found that having > > querying at around the 1 second mark tended to result in noticable > > system performace degredation.
> I think it's up to the backend to poll more slowly and cache the results > on those machines then.
The kernel backend or the userspace backend? We need to decide on terminology :) There's no good programmatic way of determining how long a query will take other than doing it and looking at the result. I guess we could do that at boot time.
-- Matthew Garrett | mjg59@srcf.ucam.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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