Messages in this thread |  | | Date | Fri, 29 Jun 2001 00:57:30 +0200 | From | Pavel Machek <> | Subject | Re: Is it useful to support user level drivers |
| |
Hi!
> > (i.e. counted). An alternative to queuing (user selectable) is to block > > interrupt generation at hardware level in kernel space immediately > > before notification. > > > > I'm missing something? > > IRQ 9 shared between user space app and disk. IRQ arrives is disabled and > reported, app wakes up, app wants to page in code, IRQ is disabled, > box dies
Actually, what about specifying that your usermode app has to be pagelocked?
Alternatively.... You *can* do disk I/O without interrupts. Just poll your IDE controller. [I'm doing that on my velo.] Hopefully your timer IRQ is not shared with usermode app, then :-( [but that's almost impossible on PCs, right?]. Pavel -- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.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/
|  |