questions on page swapping

questions on page swapping

[Michael Slater]

Hi,

   I am relatively new to linux memory management and i would like to
   have some pointers regarding swapping out pages.
   I was looking at the try_to_swap_out code and i have a few questions.
   1) If a page is swapped out does it go to the swap--cache as well as
   to the swap space in disk? 
   Also a comment says "If the page is in swap-cache we can just drop
   reference to it as it is up-to date in disk". Does it means that the
   page is just discarded and the page tables updated.

   2) What happens when a page is in swap-cache and is dirtied.Do
   we update the page in swap-cache before freeing it? Can we have a
   dirty page in swap-cache?

   3) What will be the page-count of a page when it is being swapped out
   . Is it 1 (as reference to the page in page-cache also counts i
   guess..)? If a page is only in swap-cache what is its count? Can a
   page be in swap/page cache at the same time.What will be its count
   then?

   Last but not the least: Where can i get a detailed notes on linux
   memory mgmt? Does paul-wilson have an updated version of his notes.

   Pl cc to me as i am not part of linux-mm gp. 

   Thanks in advance
   mike

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