linux-toradex.git/include/linux/swap.h, branch v6.0-rc1

Merge tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-08-05T23:32:45+00:00

Pull MM updates from Andrew Morton:
 "Most of the MM queue. A few things are still pending.

  Liam's maple tree rework didn't make it. This has resulted in a few
  other minor patch series being held over for next time.

  Multi-gen LRU still isn't merged as we were waiting for mapletree to
  stabilize. The current plan is to merge MGLRU into -mm soon and to
  later reintroduce mapletree, with a view to hopefully getting both
  into 6.1-rc1.

  Summary:

   - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
     Lin, Yang Shi, Anshuman Khandual and Mike Rapoport

   - Some kmemleak fixes from Patrick Wang and Waiman Long

   - DAMON updates from SeongJae Park

   - memcg debug/visibility work from Roman Gushchin

   - vmalloc speedup from Uladzislau Rezki

   - more folio conversion work from Matthew Wilcox

   - enhancements for coherent device memory mapping from Alex Sierra

   - addition of shared pages tracking and CoW support for fsdax, from
     Shiyang Ruan

   - hugetlb optimizations from Mike Kravetz

   - Mel Gorman has contributed some pagealloc changes to improve
     latency and realtime behaviour.

   - mprotect soft-dirty checking has been improved by Peter Xu

   - Many other singleton patches all over the place"

 [ XFS merge from hell as per Darrick Wong in

   https://lore.kernel.org/all/YshKnxb4VwXycPO8@magnolia/ ]

* tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (282 commits)
  tools/testing/selftests/vm/hmm-tests.c: fix build
  mm: Kconfig: fix typo
  mm: memory-failure: convert to pr_fmt()
  mm: use is_zone_movable_page() helper
  hugetlbfs: fix inaccurate comment in hugetlbfs_statfs()
  hugetlbfs: cleanup some comments in inode.c
  hugetlbfs: remove unneeded header file
  hugetlbfs: remove unneeded hugetlbfs_ops forward declaration
  hugetlbfs: use helper macro SZ_1{K,M}
  mm: cleanup is_highmem()
  mm/hmm: add a test for cross device private faults
  selftests: add soft-dirty into run_vmtests.sh
  selftests: soft-dirty: add test for mprotect
  mm/mprotect: fix soft-dirty check in can_change_pte_writable()
  mm: memcontrol: fix potential oom_lock recursion deadlock
  mm/gup.c: fix formatting in check_and_migrate_movable_page()
  xfs: fail dax mount if reflink is enabled on a partition
  mm/memcontrol.c: remove the redundant updating of stats_flush_threshold
  userfaultfd: don't fail on unrecognized features
  hugetlb_cgroup: fix wrong hugetlb cgroup numa stat
  ...

mm: vmpressure: don't count proactive reclaim in vmpressure

2022-07-30T01:07:15+00:00

memory.reclaim is a cgroup v2 interface that allows users to proactively
reclaim memory from a memcg, without real memory pressure.  Reclaim
operations invoke vmpressure, which is used: (a) To notify userspace of
reclaim efficiency in cgroup v1, and (b) As a signal for a memcg being
under memory pressure for networking (see
mem_cgroup_under_socket_pressure()).

For (a), vmpressure notifications in v1 are not affected by this change
since memory.reclaim is a v2 feature.

For (b), the effects of the vmpressure signal (according to Shakeel [1])
are as follows:
1. Reducing send and receive buffers of the current socket.
2. May drop packets on the rx path.
3. May throttle current thread on the tx path.

Since proactive reclaim is invoked directly by userspace, not by memory
pressure, it makes sense not to throttle networking.  Hence, this change
makes sure that proactive reclaim caused by memory.reclaim does not
trigger vmpressure.

[1] https://lore.kernel.org/lkml/CALvZod68WdrXEmBpOkadhB5GPYmCXaDZzXH=yyGOCAjFRn4NDQ@mail.gmail.com/

[yosryahmed@google.com: update documentation]
  Link: https://lkml.kernel.org/r/20220721173015.2643248-1-yosryahmed@google.com
Link: https://lkml.kernel.org/r/20220714064918.2576464-1-yosryahmed@google.com
Signed-off-by: Yosry Ahmed 
Acked-by: Shakeel Butt 
Acked-by: Michal Hocko 
Acked-by: David Rientjes 
Cc: Johannes Weiner 
Cc: Roman Gushchin 
Cc: Muchun Song 
Cc: Matthew Wilcox 
Cc: Vlastimil Babka 
Cc: David Hildenbrand 
Cc: Miaohe Lin 
Cc: NeilBrown 
Cc: Alistair Popple 
Cc: Suren Baghdasaryan 
Cc: Peter Xu 
Signed-off-by: Andrew Morton

mm/khugepaged: try to free transhuge swapcache when possible

2022-07-04T01:08:52+00:00

Transhuge swapcaches won't be freed in __collapse_huge_page_copy().  It's
because release_pte_page() is not called for these pages and thus
free_page_and_swap_cache can't grab the page lock.  These pages won't be
freed from swap cache even if we are the only user until next time
reclaim.  It shouldn't hurt indeed, but we could try to free these pages
to save more memory for system.

Link: https://lkml.kernel.org/r/20220625092816.4856-8-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin 
Cc: Alistair Popple 
Cc: Andrea Arcangeli 
Cc: David Hildenbrand 
Cc: David Howells 
Cc: Matthew Wilcox (Oracle) 
Cc: NeilBrown 
Cc: Peter Xu 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Cc: Yang Shi 
Cc: Zach O'Keefe 
Signed-off-by: Andrew Morton

vmscan: Add check_move_unevictable_folios()

2022-06-29T12:51:06+00:00

Change the guts of check_move_unevictable_pages() over to use folios
and add check_move_unevictable_pages() as a wrapper.

Signed-off-by: Matthew Wilcox (Oracle) 
Acked-by: Christian Brauner (Microsoft)

docs: rename Documentation/vm to Documentation/mm

2022-06-27T19:52:53+00:00

so it will be consistent with code mm directory and with
Documentation/admin-guide/mm and won't be confused with virtual machines.

Signed-off-by: Mike Rapoport 
Suggested-by: Matthew Wilcox 
Tested-by: Ira Weiny 
Acked-by: Jonathan Corbet 
Acked-by: Wu XiangCheng

mm/swapfile: unuse_pte can map random data if swap read fails

2022-05-27T16:33:45+00:00

Patch series "A few fixup patches for mm", v4.

This series contains a few patches to avoid mapping random data if swap
read fails and fix lost swap bits in unuse_pte.  Also we free hwpoison and
swapin error entry in madvise_free_pte_range and so on.  More details can
be found in the respective changelogs.  


This patch (of 5):

There is a bug in unuse_pte(): when swap page happens to be unreadable,
page filled with random data is mapped into user address space.  In case
of error, a special swap entry indicating swap read fails is set to the
page table.  So the swapcache page can be freed and the user won't end up
with a permanently mounted swap because a sector is bad.  And if the page
is accessed later, the user process will be killed so that corrupted data
is never consumed.  On the other hand, if the page is never accessed, the
user won't even notice it.

Link: https://lkml.kernel.org/r/20220519125030.21486-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220519125030.21486-2-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin 
Acked-by: David Hildenbrand 
Cc: Hugh Dickins 
Cc: Matthew Wilcox (Oracle) 
Cc: Vlastimil Babka 
Cc: David Howells 
Cc: NeilBrown 
Cc: Alistair Popple 
Cc: Suren Baghdasaryan 
Cc: Peter Xu 
Cc: Ralph Campbell 
Cc: Naoya Horiguchi 
Signed-off-by: Andrew Morton

mm: zswap: add basic meminfo and vmstat coverage

2022-05-19T21:08:53+00:00

Currently it requires poking at debugfs to figure out the size and
population of the zswap cache on a host.  There are no counters for reads
and writes against the cache.  As a result, it's difficult to understand
zswap behavior on production systems.

Print zswap memory consumption and how many pages are zswapped out in
/proc/meminfo.  Count zswapouts and zswapins in /proc/vmstat.

Link: https://lkml.kernel.org/r/20220510152847.230957-6-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner 
Acked-by: David Hildenbrand 
Cc: Dan Streetman 
Cc: Michal Hocko 
Cc: Minchan Kim 
Cc: Roman Gushchin 
Cc: Seth Jennings 
Cc: Shakeel Butt 
Signed-off-by: Andrew Morton

mm/swap: fix comment about swap extent

2022-05-19T21:08:52+00:00

Since commit 4efaceb1c5f8 ("mm, swap: use rbtree for swap_extent"), rbtree
is used for swap extent.  Also curr_swap_extent is removed at that time. 
Update the corresponding comment.

Link: https://lkml.kernel.org/r/20220509131416.17553-16-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin 
Cc: Alistair Popple 
Cc: David Hildenbrand 
Cc: David Howells 
Cc: Matthew Wilcox 
Cc: Naoya Horiguchi 
Cc: NeilBrown 
Cc: Peter Xu 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Cc: Oscar Salvador 
Signed-off-by: Andrew Morton

mm/swap: make page_swapcount and __lru_add_drain_all static

2022-05-19T21:08:51+00:00

Make page_swapcount and __lru_add_drain_all static.  They are only used
within the file now.

Link: https://lkml.kernel.org/r/20220509131416.17553-9-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin 
Reviewed-by: David Hildenbrand 
Reviewed-by: Oscar Salvador 
Cc: Alistair Popple 
Cc: David Howells 
Cc: Matthew Wilcox 
Cc: Naoya Horiguchi 
Cc: NeilBrown 
Cc: Peter Xu 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Cc: Oscar Salvador 
Signed-off-by: Andrew Morton

mm/swap: add folio_throttle_swaprate

2022-05-13T14:20:16+00:00

The only use of the page argument to cgroup_throttle_swaprate() is to get
the node ID, and this will be the same for all pages in the folio, so just
pass in the first page of the folio.

Link: https://lkml.kernel.org/r/20220504182857.4013401-18-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Andrew Morton