VM pager subsystem shutdown?

[Andre Guibert de Bruet]

Hi,

Upon looking at the boot(9) code in kern_shutdown.c, it occured to me that 
there doesn't seem to be shutdown code for the VM pager subsystem. Is this 
done on purpose? If not, is creating a global-scope function in 
vm/swap_pager.c that iterates over the swdevt's in the LISTQ and feeds 
them swap_pager_swapoff() the simplest of ways of going about this?

I stumbled upon this while analyzing the various vnodes still open at 
shutdown during the call to vfs_unmountall (See the patch in the "The 
"unmount of /dev failed (BUSY)" message, explained" thread). The only 
reason for the reference to /dev/amrd0s1b that I can think of would be the 
use of swap, and disabling it in fstab and re-performing the test confirms 
this.

Please be gentle, I am still learning about our VM subsystem... :-)

Andy

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