Re: [patch] NEW: arca-vm-21, swapout via shrink_mmap using PG_dirty

[Linus Torvalds <torvalds@transmeta.com>]

On Mon, 18 Jan 1999, Andrea Arcangeli wrote:
> 
> I can't understand this. I think to know _where_ to mark the page dirty
> (in the `if (vm_op->swapout)' path) but I don't understand _where_ to
> write the page out to disk avoiding the fs deadlock. Writing them in
> shrink_mmap() would not fix the deadlock (obviously if shrink_mmap() is
> still recalled as now by try_to_free_pages() etc...). 

You'd write them out only from a separate deamon that only needs to scan
the physical page map. That separate deamon might actually be kswapd, but
that's just an implementation detail rather than a conceptual issue.

		Linus

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