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mm: remove vma arg from page_evictable

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page_evictable(page, vma) is an irritant: almost all its callers pass
NULL for vma.  Remove the vma arg and use mlocked_vma_newpage(vma, page)
explicitly in the couple of places it's needed.  But in those places we
don't even need page_evictable() itself!  They're dealing with a freshly
allocated anonymous page, which has no "mapping" and cannot be mlocked yet.

Signed-off-by: Hugh Dickins <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Rik van Riel <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Michel Lespinasse <[email protected]>
Cc: Ying Han <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2012-10-08 16:33:18 -07:00 • committed by Linus Torvalds
commit 39b5f29ac1
7 changed files with 18 additions and 32 deletions
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10
Documentation/vm/unevictable-lru.txt
View file

@ -197,12 +197,8 @@ the pages are also "rescued" from the unevictable list in the process of
freeing them.
page_evictable() also checks for mlocked pages by testing an additional page
flag, PG_mlocked (as wrapped by PageMlocked()). If the page is NOT mlocked,
and a non-NULL VMA is supplied, page_evictable() will check whether the VMA is
VM_LOCKED via is_mlocked_vma(). is_mlocked_vma() will SetPageMlocked() and
update the appropriate statistics if the vma is VM_LOCKED. This method allows
efficient "culling" of pages in the fault path that are being faulted in to
VM_LOCKED VMAs.
flag, PG_mlocked (as wrapped by PageMlocked()), which is set when a page is
faulted into a VM_LOCKED vma, or found in a vma being VM_LOCKED.
VMSCAN'S HANDLING OF UNEVICTABLE PAGES
@ -651,7 +647,7 @@ PAGE RECLAIM IN shrink_*_list()
-------------------------------
shrink_active_list() culls any obviously unevictable pages - i.e.
!page_evictable(page, NULL) - diverting these to the unevictable list.
!page_evictable(page) - diverting these to the unevictable list.
However, shrink_active_list() only sees unevictable pages that made it onto the
active/inactive lru lists. Note that these pages do not have PageUnevictable
set - otherwise they would be on the unevictable list and shrink_active_list