Re: page_referenced() and VM_LOCKED

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Thu, 15 Nov 2007 20:25:45 -0800
Ethan Solomita <solo@google.com> wrote:

> page_referenced_file() checks for the vma to be VM_LOCKED|VM_MAYSHARE
> and adds returns 1. We don't do the same in page_referenced_anon(). I
> would've thought the point was to treat locked pages as active, never
> pushing them into the inactive list, but since that's not quite what's
> happening I was hoping someone could give me a clue.
> 
> 	Thanks,
> 	-- Ethan
Hmm,

== vmscan.c::shrink_page_list()

   page_referenced()  if returns 1 ->  link to active list
   
   add to swap  # only works if anon

   try_to_unmap()    if VM_LOCKED -> SWAP_FAIL -> link to active list

==

Then, "VM_LOCKED & not referenced" anon page is added to swap cache
(before pushed back to active list)

Seems intended ?

Thanks,
- Kame

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