The patch titled
Subject: Documentation/vm/unevictable-lru.txt: document interaction between compaction and the unevictable LRU
has been added to the -mm tree. Its filename is
document-interaction-between-compaction-and-the-unevictable-lru.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/document-interaction-between-compaction-and-the-unevictable-lru.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/document-interaction-between-compaction-and-the-unevictable-lru.patch
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------------------------------------------------------
From: Eric B Munson <emunson@xxxxxxxxxx>
Subject: Documentation/vm/unevictable-lru.txt: document interaction between compaction and the unevictable LRU
The memory compaction code uses the migration code to do most of the work
in compaction. However, the compaction code interacts with the
unevictable LRU differently than migration code and this difference should
be noted in the documentation.
Signed-off-by: Eric B Munson <emunson@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/vm/unevictable-lru.txt | 11 +++++++++++
1 file changed, 11 insertions(+)
diff -puN Documentation/vm/unevictable-lru.txt~document-interaction-between-compaction-and-the-unevictable-lru Documentation/vm/unevictable-lru.txt
--- a/Documentation/vm/unevictable-lru.txt~document-interaction-between-compaction-and-the-unevictable-lru
+++ a/Documentation/vm/unevictable-lru.txt
@@ -22,6 +22,7 @@ CONTENTS
- Filtering special vmas.
- munlock()/munlockall() system call handling.
- Migrating mlocked pages.
+ - Compacting mlocked pages.
- mmap(MAP_LOCKED) system call handling.
- munmap()/exit()/exec() system call handling.
- try_to_unmap().
@@ -450,6 +451,16 @@ list because of a race between munlock a
putback_lru_page() function to add migrated pages back to the LRU.
+COMPACTING MLOCKED PAGES
+------------------------
+
+The unevictable LRU can be scanned for compactable regions and the default
+behavior is to do so. There is a sysctl to control this behavior (see
+Documentation/sysctl/vm.txt). Once scanning of the unevictable LRU is
+enabled, the work of compaction is mostly handled by the page migration code
+and the same work flow as described in MIGRATING MLOCKED PAGES will apply.
+
+
mmap(MAP_LOCKED) SYSTEM CALL HANDLING
-------------------------------------
_
Patches currently in -mm which might be from emunson@xxxxxxxxxx are
allow-compaction-of-unevictable-pages.patch
document-interaction-between-compaction-and-the-unevictable-lru.patch
document-interaction-between-compaction-and-the-unevictable-lru-fix.patch
mm-doc-cleanup-and-clarify-munmap-behavior-for-hugetlb-memory.patch
mm-selftests-test-return-value-of-munmap-for-map_hugetlb-memory.patch
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