Hi!
> >>I think he doesn't need to export it at all and he should write code to
> >>park and disable hard disk instead.
> >>(in userspace it's unsolvable --- i.e. you can't enable hard disk when
> >>detected stable condition if the daemon is swapped out on that hard disk)
> >
> >man mlockall() :-).
>
> You also must not use any syscall that allocates even temporary memory in
> kernel (select, poll, many others ...) or that waits on semaphore that
> might be held while allocating memory (i.e. audit and rewrite ide ioctl
> path).
Kernel module would have exactly same problem.
> And you need extra flags to protect the daemon from being killed at
> shutdown or blocked at suspend.
Why?
> >Accelerometer is usefull for other stuff besides parking heads, like
> >playing marble madness or what is the name of the game, and even
> >parking heads is way too complex to be put into the kernel.
> >
> >Even if you don't like mlockall(), you can put timeout into
> >disk-freezing interface.
>
> That makes the protection less reliable (you shake the notebook and after
> the timeout drop it).
Idea is that userland app keeps saying "unfreeze 5 seconds in future"
as long as you keep shaking -- essentialy a deadlock prevention.
Pavel
--
if you have sharp zaurus hardware you don't need... you know my address
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |