linux-toradex.git/Documentation/vm, branch v5.16

mm/migrate.c: remove MIGRATE_PFN_LOCKED

2021-11-11T17:34:35+00:00

MIGRATE_PFN_LOCKED is used to indicate to migrate_vma_prepare() that a
source page was already locked during migrate_vma_collect().  If it
wasn't then the a second attempt is made to lock the page.  However if
the first attempt failed it's unlikely a second attempt will succeed,
and the retry adds complexity.  So clean this up by removing the retry
and MIGRATE_PFN_LOCKED flag.

Destination pages are also meant to have the MIGRATE_PFN_LOCKED flag
set, but nothing actually checks that.

Link: https://lkml.kernel.org/r/20211025041608.289017-1-apopple@nvidia.com
Signed-off-by: Alistair Popple 
Reviewed-by: Ralph Campbell 
Acked-by: Felix Kuehling 
Cc: Alex Deucher 
Cc: Jerome Glisse 
Cc: John Hubbard 
Cc: Zi Yan 
Cc: Christoph Hellwig 
Cc: Ben Skeggs 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'akpm' (patches from Andrew)

2021-11-06T21:08:17+00:00

Merge misc updates from Andrew Morton:
 "257 patches.

  Subsystems affected by this patch series: scripts, ocfs2, vfs, and
  mm (slab-generic, slab, slub, kconfig, dax, kasan, debug, pagecache,
  gup, swap, memcg, pagemap, mprotect, mremap, iomap, tracing, vmalloc,
  pagealloc, memory-failure, hugetlb, userfaultfd, vmscan, tools,
  memblock, oom-kill, hugetlbfs, migration, thp, readahead, nommu, ksm,
  vmstat, madvise, memory-hotplug, rmap, zsmalloc, highmem, zram,
  cleanups, kfence, and damon)"

* emailed patches from Andrew Morton : (257 commits)
  mm/damon: remove return value from before_terminate callback
  mm/damon: fix a few spelling mistakes in comments and a pr_debug message
  mm/damon: simplify stop mechanism
  Docs/admin-guide/mm/pagemap: wordsmith page flags descriptions
  Docs/admin-guide/mm/damon/start: simplify the content
  Docs/admin-guide/mm/damon/start: fix a wrong link
  Docs/admin-guide/mm/damon/start: fix wrong example commands
  mm/damon/dbgfs: add adaptive_targets list check before enable monitor_on
  mm/damon: remove unnecessary variable initialization
  Documentation/admin-guide/mm/damon: add a document for DAMON_RECLAIM
  mm/damon: introduce DAMON-based Reclamation (DAMON_RECLAIM)
  selftests/damon: support watermarks
  mm/damon/dbgfs: support watermarks
  mm/damon/schemes: activate schemes based on a watermarks mechanism
  tools/selftests/damon: update for regions prioritization of schemes
  mm/damon/dbgfs: support prioritization weights
  mm/damon/vaddr,paddr: support pageout prioritization
  mm/damon/schemes: prioritize regions within the quotas
  mm/damon/selftests: support schemes quotas
  mm/damon/dbgfs: support quotas of schemes
  ...

Docs/DAMON: document physical memory monitoring support

2021-11-06T20:30:45+00:00

This updates the DAMON documents for the physical memory address space
monitoring support.

Link: https://lkml.kernel.org/r/20211012205711.29216-8-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Amit Shah 
Cc: Benjamin Herrenschmidt 
Cc: Brendan Higgins 
Cc: David Hildenbrand 
Cc: David Rienjes 
Cc: David Woodhouse 
Cc: Greg Thelen 
Cc: Jonathan Cameron 
Cc: Jonathan Corbet 
Cc: Leonard Foerster 
Cc: Marco Elver 
Cc: Markus Boehme 
Cc: Shakeel Butt 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

docs/vm/damon: remove broken reference

2021-11-06T20:30:44+00:00

Building DAMON documents warns for a reference to nonexisting doc, as
below:

    $ time make htmldocs
    [...]
    Documentation/vm/damon/index.rst:24: WARNING: toctree contains reference to nonexisting document 'vm/damon/plans'

This fixes the warning by removing the wrong reference.

Link: https://lkml.kernel.org/r/20210917123958.3819-4-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Jonathan Corbet 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Documentation/vm: move user guides to admin-guide/mm/

2021-11-06T20:30:44+00:00

Most memory management user guide documents are in 'admin-guide/mm/',
but two of those are in 'vm/'.  This moves the two docs into
'admin-guide/mm' for easier documents finding.

Link: https://lkml.kernel.org/r/20210917123958.3819-2-sj@kernel.org
Signed-off-by: SeongJae Park 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

tools/vm/page_owner_sort.c: count and sort by mem

2021-11-06T20:30:40+00:00

When viewing page owner information, we may be more concerned about the
total memory rather than the times of stack appears.  Therefore, the
following adjustments are made:

1. Added the statistics on the total number of pages.

2. Added the optional parameter "-m" to configure the program to sort by
   memory (total pages).

The general output of page_owner is as follows:

	Page allocated via order XXX, ...
	PFN XXX ...
	 // Detailed stack

	Page allocated via order XXX, ...
	PFN XXX ...
	 // Detailed stack

The original page_owner_sort ignores PFN rows, puts the remaining rows
in buf, counts the times of buf, and finally sorts them according to the
times.  General output:

	XXX times:
	Page allocated via order XXX, ...
	 // Detailed stack

Now, we use regexp to extract the page order value from the buf, and
count the total pages for the buf.  General output:

	XXX times, XXX pages:
	Page allocated via order XXX, ...
	 // Detailed stack

By default, it is still sorted by the times of buf; If you want to sort
by the pages nums of buf, use the new -m parameter.

Link: https://lkml.kernel.org/r/1631678242-41033-1-git-send-email-weizhenliang@huawei.com
Signed-off-by: Zhenliang Wei 
Cc: Tang Bin 
Cc: Zhang Shengju 
Cc: Zhenliang Wei 
Cc: Xiaoming Ni 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Doc: page_migration: fix numbering for non-LRU movable flags

2021-09-14T20:54:01+00:00

The non-LRU movable flags part is not relevant to above 3 funcitons, so remove
the number 4.

Signed-off-by: Li Xinhai 

Link: https://lore.kernel.org/r/20210908145215.592325-1-lixinhai.lxh@gmail.com
Signed-off-by: Jonathan Corbet

Merge branch 'akpm' (patches from Andrew)

2021-09-08T19:55:35+00:00

Merge more updates from Andrew Morton:
 "147 patches, based on 7d2a07b769330c34b4deabeed939325c77a7ec2f.

  Subsystems affected by this patch series: mm (memory-hotplug, rmap,
  ioremap, highmem, cleanups, secretmem, kfence, damon, and vmscan),
  alpha, percpu, procfs, misc, core-kernel, MAINTAINERS, lib,
  checkpatch, epoll, init, nilfs2, coredump, fork, pids, criu, kconfig,
  selftests, ipc, and scripts"

* emailed patches from Andrew Morton : (94 commits)
  scripts: check_extable: fix typo in user error message
  mm/workingset: correct kernel-doc notations
  ipc: replace costly bailout check in sysvipc_find_ipc()
  selftests/memfd: remove unused variable
  Kconfig.debug: drop selecting non-existing HARDLOCKUP_DETECTOR_ARCH
  configs: remove the obsolete CONFIG_INPUT_POLLDEV
  prctl: allow to setup brk for et_dyn executables
  pid: cleanup the stale comment mentioning pidmap_init().
  kernel/fork.c: unexport get_{mm,task}_exe_file
  coredump: fix memleak in dump_vma_snapshot()
  fs/coredump.c: log if a core dump is aborted due to changed file permissions
  nilfs2: use refcount_dec_and_lock() to fix potential UAF
  nilfs2: fix memory leak in nilfs_sysfs_delete_snapshot_group
  nilfs2: fix memory leak in nilfs_sysfs_create_snapshot_group
  nilfs2: fix memory leak in nilfs_sysfs_delete_##name##_group
  nilfs2: fix memory leak in nilfs_sysfs_create_##name##_group
  nilfs2: fix NULL pointer in nilfs_##name##_attr_release
  nilfs2: fix memory leak in nilfs_sysfs_create_device_group
  trap: cleanup trap_init()
  init: move usermodehelper_enable() to populate_rootfs()
  ...

Documentation: add documents for DAMON

2021-09-08T18:50:25+00:00

This commit adds documents for DAMON under
`Documentation/admin-guide/mm/damon/` and `Documentation/vm/damon/`.

Link: https://lkml.kernel.org/r/20210716081449.22187-11-sj38.park@gmail.com
Signed-off-by: SeongJae Park 
Reviewed-by: Fernand Sieber 
Reviewed-by: Markus Boehme 
Cc: Alexander Shishkin 
Cc: Amit Shah 
Cc: Benjamin Herrenschmidt 
Cc: Brendan Higgins 
Cc: David Hildenbrand 
Cc: David Rientjes 
Cc: David Woodhouse 
Cc: Fan Du 
Cc: Greg Kroah-Hartman 
Cc: Greg Thelen 
Cc: Ingo Molnar 
Cc: Joe Perches 
Cc: Jonathan Cameron 
Cc: Jonathan Corbet 
Cc: Leonard Foerster 
Cc: Marco Elver 
Cc: Maximilian Heyne 
Cc: Mel Gorman 
Cc: Minchan Kim 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Rik van Riel 
Cc: Shakeel Butt 
Cc: Shuah Khan 
Cc: Steven Rostedt (VMware) 
Cc: Vladimir Davydov 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

doc: hwpoison: correct the support for hugepage

2021-09-03T16:58:15+00:00

The hwpoison support for huge page, both hugetlb and THP, has been in
kernel for a while, the statement in document is obsolete, correct it.

Link: https://lkml.kernel.org/r/20210819054116.266126-2-shy828301@gmail.com
Signed-off-by: Yang Shi 
Acked-by: Naoya Horiguchi 
Reviewed-by: David Hildenbrand 
Cc: Oscar Salvador 
Cc: David Mackey 
Cc: Jonathan Corbet 
Cc: Matthew Wilcox (Oracle) 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds