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The kernel stack is now above the Proc structure,
so the explicit kstack pointer can be eliminated.
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Previously, mmurelease() was always called with
palloc spinlock held.
This is unneccesary for some mmurelease()
implementations as they wont release pages
to the palloc pool.
This change removes pagechainhead() and
pagechaindone() and replaces them with just
freepages() call, which aquires the palloc
lock internally as needed.
freepages() avoids holding the palloc lock
while walking the linked list of pages,
avoding some lock contention.
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was only implemented by the pc kernel. does not
account pages used by the mount cache.
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we keep the details about palloc in page.c, providing pagechaindone()
for mmu code to be called after a series of pagechainhead() calls.
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