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| author | Hugh Dickins <hughd@google.com> | 2012-10-08 16:33:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 16:22:55 +0900 |
| commit | 39b5f29ac1f988c1615fbc9c69f6651ab0d0c3c7 (patch) | |
| tree | d8030f58d542bb3e811d83676b38c5b4b3a16c02 /Documentation/vm | |
| parent | ec4d9f626d5908b6052c2973f37992f1db52e967 (diff) | |
| download | lwn-39b5f29ac1f988c1615fbc9c69f6651ab0d0c3c7.tar.gz lwn-39b5f29ac1f988c1615fbc9c69f6651ab0d0c3c7.zip | |
mm: remove vma arg from page_evictable
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 <hughd@google.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Rik van Riel <riel@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michel Lespinasse <walken@google.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/vm')
| -rw-r--r-- | Documentation/vm/unevictable-lru.txt | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/Documentation/vm/unevictable-lru.txt b/Documentation/vm/unevictable-lru.txt index 323ff5dba1cc..a68db7692ee8 100644 --- a/Documentation/vm/unevictable-lru.txt +++ b/Documentation/vm/unevictable-lru.txt @@ -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 |