RE: [ACPI] Runlevel for Sleep?

[Patrick M. <mo...@os...>]

On Fri, 6 Sep 2002, Grover, Andrew wrote:

> > From: Patrick Mochel [mailto:mo...@os...] 
> > [1] Once upon a time (last May), I implemented a patch that 
> > overloaded the
> > reboot(2) system call to initiate suspend transitions in a
> > platform-specific manner (as per Linus's suggestion). This is in the
> > resurrection queue and will probably resurface soon. 
> 
> Hmm.
> 
> Maybe it would be cleaner to give sleep its own system call.
> 
> Having reboot(2) overloaded with suspend functionality is a little
> non-intuitive. Just a thought.

That's what I did initially, but I was encouraged instead to overload 
reboot. And, it does make quite a bit of sense considering the following:

- syscall numbers are few and very difficult to get. We'd be taking one
that only makes sense on a subset of the x86 platforms out there and on a
subset of the total architectures (though this subset accounts for
probably 95% of the install base).

- reboot(2) is a power transition. suspend(2) is a power transition. 
Conceptuallly, they're similar. They are functionally, too. 

- swsusp already has a hook in it.


	-pat