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authorPatrick McHardy <kaber@trash.net>2013-03-31 18:10:34 +0200
committerPatrick McHardy <kaber@trash.net>2013-03-31 18:10:34 +0200
commit70711d223510ba1773cfe1d7770a56141c815ff8 (patch)
tree4a71f38a3a554ddecaa31b7d8c6bc49b7d1705b4 /Documentation/vm/unevictable-lru.txt
parentd53b4ed072d9779cdf53582c46436dec06d0961f (diff)
parent19f949f52599ba7c3f67a5897ac6be14bfcb1200 (diff)
Merge tag 'v3.8' of /home/kaber/src/repos/linux
Linux 3.8 Signed-off-by: Patrick McHardy <kaber@trash.net> Conflicts: include/linux/Kbuild include/linux/netlink.h
Diffstat (limited to 'Documentation/vm/unevictable-lru.txt')
-rw-r--r--Documentation/vm/unevictable-lru.txt14
1 files changed, 5 insertions, 9 deletions
diff --git a/Documentation/vm/unevictable-lru.txt b/Documentation/vm/unevictable-lru.txt
index fa206cccf89..a68db7692ee 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
@@ -371,8 +367,8 @@ mlock_fixup() filters several classes of "special" VMAs:
mlock_fixup() will call make_pages_present() in the hugetlbfs VMA range to
allocate the huge pages and populate the ptes.
-3) VMAs with VM_DONTEXPAND or VM_RESERVED are generally userspace mappings of
- kernel pages, such as the VDSO page, relay channel pages, etc. These pages
+3) VMAs with VM_DONTEXPAND are generally userspace mappings of kernel pages,
+ such as the VDSO page, relay channel pages, etc. These pages
are inherently unevictable and are not managed on the LRU lists.
mlock_fixup() treats these VMAs the same as hugetlbfs VMAs. It calls
make_pages_present() to populate the ptes.
@@ -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