Re: CVS commit: src/sys/arch

[Christoph Egger <Christoph_Egger%gmx.de@localhost>]

David Young wrote:
> Module Name:  src
> Committed By: dyoung
> Date:         Fri Jun 26 23:40:27 UTC 2009
> 
> Modified Files:
>       src/sys/arch/i386/i386: machdep.c
>       src/sys/arch/sparc64/sparc64: machdep.c
> 
> Log Message:
> During a normal shutdown, gracefully tear down arbitrary stacks of
> filesystems and (pseudo-)devices, according to the algorithm at A3
> and A4, below.
> 
> Proposed and discussed at
> <http://mail-index.netbsd.org/tech-kern/2009/04/20/msg004864.html>.  No
> objections.
> 
> During an emergency shutdown (e.g., shutdown -n, or after a panic),
> shutdown is simple as always: filesystems are not sync'd or unmounted,
> and devices are not detached.
> 
> It was necessary to change the order of operations during shutdown,
> but the new order is more sensible: if a core dump is desired, then
> cpu_reboot(9) dumps it first.  cpu_reboot(9) does not call legacy
> shutdown hooks any longer: they can interfere with device detachment
> and PMF shutdown, and very few legacy hooks remain.
> 
> Here is the old order of operations:
> 
> B1 sync filesystems and TOD clock
> B2 unmount filesystems
> B3 dump core
> B4 detach devices
> B5 run legacy shutdown hooks
> B6 run PMF shutdown hooks
> B7 suspend interrupts
> B8 MD reboot/shutdown/powerdown
> 
> And here is the new order:
> 
> A1 dump core
> A2 sync filesystems and TOD clock
> A3 unmount one or more filesystems OR
>    detach one or more devices OR
>    forcefully unmount one filesystem OR
>    skip to 5
> A4 repeat at 3
> A5 run PMF shutdown hooks
> A6 suspend interrupts
> A7 MD reboot/shutdown/powerdown
> 
> Tested on Dell Dimension 3000, Dell PowerEdge 1950, Sun Fire V120,
> Soekris net4521 and net4801.
> 
> VS: ----------------------------------------------------------------------

Will the new order allow Suspend-to-disk (ACPI S4) ?

Christoph