litmus-rt.git/Documentation/vm, branch test

Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6

2015-04-18T15:10:49+00:00

Pull documentation updates from Jonathan Corbet:
 "Numerous fixes, the overdue removal of the i2o docs, some new Chinese
  translations, and, hopefully, the README fix that will end the flow of
  identical patches to that file"

* tag 'docs-for-linus' of git://git.lwn.net/linux-2.6: (34 commits)
  Documentation/memcg: update memcg/kmem status
  Documentation: blackfin: Makefile: Typo building issue
  Documentation/vm/pagemap.txt: correct location of page-types tool
  Documentation/memory-barriers.txt: typo fix
  doc: Add guest_nice column to example output of `cat /proc/stat'
  Documentation/kernel-parameters: Move "eagerfpu" to its right place
  Documentation: gpio: Update ACPI part of the document to mention _DSD
  docs/completion.txt: Various tweaks and corrections
  doc: completion: context, scope and language fixes
  Documentation:Update Documentation/zh_CN/arm64/memory.txt
  Documentation:Update Documentation/zh_CN/arm64/booting.txt
  Documentation: Chinese translation of arm64/legacy_instructions.txt
  DocBook media: fix broken EIA hyperlink
  Documentation: tweak the maintainers entry
  README: Change gzip/bzip2 to xz compression format
  README: Update version number reference
  doc:pci: Fix typo in Documentation/PCI
  Documentation: drm: Use '->' when describing access through pointers.
  Documentation: Remove mentioning of block barriers
  Documentation/email-clients.txt: Fix one grammar mistake, add extra info about TB
  ...

zsmalloc: zsmalloc documentation

2015-04-15T23:35:21+00:00

Create zsmalloc doc which explains design concept and stat information.

Signed-off-by: Minchan Kim 
Cc: Juneho Choi 
Cc: Gunho Lee 
Cc: Luigi Semenzato 
Cc: Dan Streetman 
Cc: Seth Jennings 
Cc: Nitin Gupta 
Cc: Jerome Marchand 
Cc: Sergey Senozhatsky 
Cc: Joonsoo Kim 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm, doc: cleanup and clarify munmap behavior for hugetlb memory

2015-04-15T23:35:19+00:00

munmap(2) of hugetlb memory requires a length that is hugepage aligned,
otherwise it may fail.  Add this to the documentation.

This also cleans up the documentation and separates it into logical units:
one part refers to MAP_HUGETLB and another part refers to requirements for
shared memory segments.

Signed-off-by: David Rientjes 
Cc: Jonathan Corbet 
Cc: Davide Libenzi 
Cc: Luiz Capitulino 
Cc: Shuah Khan 
Acked-by: Hugh Dickins 
Cc: Andrea Arcangeli 
Cc: Joern Engel 
Cc: Jianguo Wu 
Cc: Eric B Munson 
Cc: Michael Ellerman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

hugetlbfs: document min_size mount option and cleanup

2015-04-15T23:35:18+00:00

Add min_size mount option to the hugetlbfs documentation.  Also, add the
missing pagesize option and mention that size can be specified as bytes or
a percentage of huge page pool.

Signed-off-by: Mike Kravetz 
Cc: Davidlohr Bueso 
Cc: Aneesh Kumar 
Cc: Joonsoo Kim 
Cc: Andi Kleen 
Cc: David Rientjes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Documentation/vm/unevictable-lru.txt: document interaction between compaction and the unevictable LRU

2015-04-15T23:35:17+00:00

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.

[akpm@linux-foundation.org: identify /proc/sys/vm/compact_unevictable directly]
Signed-off-by: Eric B Munson 
Cc: Michal Hocko 
Cc: Vlastimil Babka 
Cc: Christoph Lameter 
Cc: David Rientjes 
Cc: Rik van Riel 
Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Mel Gorman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cleancache: forbid overriding cleancache_ops

2015-04-14T23:49:03+00:00

Currently, cleancache_register_ops returns the previous value of
cleancache_ops to allow chaining.  However, chaining, as it is
implemented now, is extremely dangerous due to possible pool id
collisions.  Suppose, a new cleancache driver is registered after the
previous one assigned an id to a super block.  If the new driver assigns
the same id to another super block, which is perfectly possible, we will
have two different filesystems using the same id.  No matter if the new
driver implements chaining or not, we are likely to get data corruption
with such a configuration eventually.

This patch therefore disables the ability to override cleancache_ops
altogether as potentially dangerous.  If there is already cleancache
driver registered, all further calls to cleancache_register_ops will
return EBUSY.  Since no user of cleancache implements chaining, we only
need to make minor changes to the code outside the cleancache core.

Signed-off-by: Vladimir Davydov 
Cc: Konrad Rzeszutek Wilk 
Cc: Boris Ostrovsky 
Cc: David Vrabel 
Cc: Mark Fasheh 
Cc: Joel Becker 
Cc: Stefan Hengelein 
Cc: Florian Schmaus 
Cc: Andor Daam 
Cc: Dan Magenheimer 
Cc: Bob Liu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: rename __mlock_vma_pages_range() to populate_vma_page_range()

2015-04-14T23:49:00+00:00

__mlock_vma_pages_range() doesn't necessarily mlock pages.  It depends on
vma flags.  The same codepath is used for MAP_POPULATE.

Let's rename __mlock_vma_pages_range() to populate_vma_page_range().

This patch also drops mlock_vma_pages_range() references from
documentation.  It has gone in cea10a19b797 ("mm: directly use
__mlock_vma_pages_range() in find_extend_vma()").

Signed-off-by: Kirill A. Shutemov 
Acked-by: Linus Torvalds 
Acked-by: David Rientjes 
Cc: Michel Lespinasse 
Cc: Rik van Riel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Documentation/vm/pagemap.txt: correct location of page-types tool

2015-04-11T13:11:21+00:00

The page-types tool was relocated to tools/vm in the 3.4 kernel timeframe.

Signed-off-by: Randy Wright 
Signed-off-by: Jonathan Corbet

doc: add information about max_ptes_none

2015-03-20T13:41:55+00:00

max_ptes_none specifies how many extra small pages (that are
not already mapped) can be allocated when collapsing a group
of small pages into one large page.

/sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none

A higher value leads to use additional memory for programs.
A lower value leads to gain less thp performance. Value of
max_ptes_none can waste cpu time very little, you can
ignore it.

Signed-off-by: Ebru Akagunduz 
Reviewed-by: Rik van Riel 
Signed-off-by: Jonathan Corbet

mm:add KPF_ZERO_PAGE flag for /proc/kpageflags

2015-02-12T01:06:00+00:00

Add KPF_ZERO_PAGE flag for zero_page, so that userspace processes can
detect zero_page in /proc/kpageflags, and then do memory analysis more
accurately.

Signed-off-by: Yalin Wang 
Acked-by: Kirill A. Shutemov 
Cc: Konstantin Khlebnikov 
Cc: Naoya Horiguchi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds