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David Hildenbrand b8a2528835 mm/hugetlb: document why hugetlb uses folio_mapcount() for COW reuse decisions 
Let's document why hugetlb still uses folio_mapcount() and is prone to
leaking memory between processes, for example using vmsplice() that still
uses FOLL_GET.

More details can be found in [1], especially around how hugetlb pages
cannot really be overcommitted, and why we don't particularly care about
these vmsplice() leaks for hugetlb -- in contrast to ordinary memory.

[1] https://lore.kernel.org/all/8b42a24d-caf0-46ef-9e15-0f88d47d2f21@redhat.com/

Link: https://lkml.kernel.org/r/20240502085259.103784-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Suggested-by: Peter Xu <peterx@redhat.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-05-07 10:36:58 -07:00
..
damon
mm/damon/paddr: implement DAMOS filter type YOUNG
2024-05-05 17:53:55 -07:00
kasan
fix missing vmalloc.h includes
2024-04-25 20:55:49 -07:00
kfence
mm: introduce slabobj_ext to support slab object extensions
2024-04-25 20:55:51 -07:00
kmsan
mm: kmsan: remove runtime checks from kmsan_unpoison_memory()
2024-02-22 10:24:41 -08:00
backing-dev.c
writeback: support retrieving per group debug writeback stats of bdi
2024-05-05 17:53:51 -07:00
balloon_compaction.c
…
bootmem_info.c
bootmem: use kmemleak_free_part_phys in put_page_bootmem
2023-10-25 16:47:13 -07:00
cma_debug.c
…
cma_sysfs.c
mm/cma: add sysfs file 'release_pages_success'
2024-02-22 10:24:57 -08:00
cma.c
mm/cma: drop incorrect alignment check in cma_init_reserved_mem
2024-04-25 20:56:42 -07:00
cma.h
mm/cma: add sysfs file 'release_pages_success'
2024-02-22 10:24:57 -08:00
compaction.c
memory: remove the now superfluous sentinel element from ctl_table array
2024-04-25 20:56:32 -07:00
debug_page_alloc.c
mm: page_alloc: consolidate free page accounting
2024-04-25 20:56:04 -07:00
debug_page_ref.c
…
debug_vm_pgtable.c
fix missing vmalloc.h includes
2024-04-25 20:55:49 -07:00
debug.c
mm/debug: print only page mapcount (excluding folio entire mapcount) in __dump_folio()
2024-05-05 17:53:31 -07:00
dmapool_test.c
…
dmapool.c
mm/mempool/dmapool: remove CONFIG_DEBUG_SLAB ifdefs
2023-12-05 11:17:58 +01:00
early_ioremap.c
…
fadvise.c
…
fail_page_alloc.c
…
failslab.c
…
filemap.c
mm: filemap: batch mm counter updating in filemap_map_pages()
2024-05-05 17:53:36 -07:00
folio-compat.c
mm: remove __set_page_dirty_nobuffers()
2024-04-25 20:56:25 -07:00
gup_test.c
…
gup_test.h
…
gup.c
gup: use folios for gup_devmap
2024-05-05 17:53:49 -07:00
highmem.c
x86/kexec: use pr_err() instead of kexec_dprintk() when an error occurs
2023-12-29 12:22:28 -08:00
hmm.c
mm/treewide: replace pXd_huge() with pXd_leaf()
2024-04-25 20:55:46 -07:00
huge_memory.c
mm: delay the check for a NULL anon_vma
2024-05-05 17:53:53 -07:00
hugetlb_cgroup.c
mm/hugetlb: assert hugetlb_lock in __hugetlb_cgroup_commit_charge
2024-05-05 17:53:41 -07:00
hugetlb_vmemmap.c
memory: remove the now superfluous sentinel element from ctl_table array
2024-04-25 20:56:32 -07:00
hugetlb_vmemmap.h
mm: hugetlb_vmemmap: fix reference to nonexistent file
2023-10-25 16:47:14 -07:00
hugetlb.c
mm/hugetlb: document why hugetlb uses folio_mapcount() for COW reuse decisions
2024-05-07 10:36:58 -07:00
hwpoison-inject.c
mm/memory-failure: convert shake_page() to shake_folio()
2024-05-05 17:53:45 -07:00
init-mm.c
mm: Deprecate pasid field
2023-12-12 10:11:32 +01:00
internal.h
mm/memory-failure: convert shake_page() to shake_folio()
2024-05-05 17:53:45 -07:00
interval_tree.c
…
io-mapping.c
…
ioremap.c
…
Kconfig
mm/treewide: rename CONFIG_HAVE_FAST_GUP to CONFIG_HAVE_GUP_FAST
2024-04-25 20:56:41 -07:00
Kconfig.debug
mm/slub: unify all sl[au]b parameters with "slab_$param"
2024-01-22 10:31:08 +01:00
khugepaged.c
mm: simplify thp_vma_allowable_order
2024-05-05 17:53:53 -07:00
kmemleak.c
mm/kmemleak: compact kmemleak_object further
2024-04-25 20:56:05 -07:00
ksm.c
mm/memory-failure: pass the folio to collect_procs_ksm()
2024-05-05 17:53:47 -07:00
list_lru.c
mm/zswap: stop lru list shrinking when encounter warm region
2024-02-22 10:24:54 -08:00
maccess.c
…
madvise.c
mm/madvise: optimize lazyfreeing with mTHP in madvise_free
2024-05-05 17:53:43 -07:00
Makefile
mm/kmemleak: disable KASAN instrumentation in kmemleak
2024-04-25 20:56:05 -07:00
mapping_dirty_helpers.c
…
memblock.c
cxl fixes for 6.8-rc6
2024-02-24 15:53:40 -08:00
memcontrol.c
memcg: fix data-race KCSAN bug in rstats
2024-05-05 17:53:50 -07:00
memfd.c
mm/memfd: refactor memfd_tag_pins() and memfd_wait_for_pins()
2024-03-04 17:01:21 -08:00
memory_hotplug.c
mm/hugetlb: rename dissolve_free_huge_pages() to dissolve_free_hugetlb_folios()
2024-05-05 17:53:35 -07:00
memory-failure.c
memory-failure: remove calls to page_mapping()
2024-05-05 17:53:48 -07:00
memory-tiers.c
memory tier: create CPUless memory tiers after obtaining HMAT info
2024-05-05 17:53:26 -07:00
memory.c
mm: optimise vmf_anon_prepare() for VMAs without an anon_vma
2024-05-05 17:53:54 -07:00
mempolicy.c
mm: add pmd_folio()
2024-04-25 20:56:19 -07:00
mempool.c
mempool: hook up to memory allocation profiling
2024-04-25 20:55:56 -07:00
memremap.c
mm: convert put_devmap_managed_page_refs() to put_devmap_managed_folio_refs()
2024-05-05 17:53:49 -07:00
memtest.c
memtest: use {READ,WRITE}_ONCE in memory scanning
2024-03-13 12:12:21 -07:00
migrate_device.c
migrate: expand the use of folio in __migrate_device_pages()
2024-05-05 17:53:48 -07:00
migrate.c
mm: convert hugetlb_page_mapping_lock_write to folio
2024-05-05 17:53:46 -07:00
mincore.c
…
mlock.c
mm: add pmd_folio()
2024-04-25 20:56:19 -07:00
mm_init.c
mm: init_mlocked_on_free_v3
2024-04-25 20:56:29 -07:00
mm_slot.h
…
mmap_lock.c
…
mmap.c
mm/mmap: make accountable_mapping return bool
2024-05-05 17:53:26 -07:00
mmu_gather.c
mm/mmu_gather: improve cond_resched() handling with large folios and expensive page freeing
2024-02-22 15:27:17 -08:00
mmu_notifier.c
…
mmzone.c
zswap: shrink zswap pool based on memory pressure
2023-12-12 10:57:02 -08:00
mprotect.c
mm: support multi-size THP numa balancing
2024-04-25 20:56:30 -07:00
mremap.c
mm: remove "prot" parameter from move_pte()
2024-04-25 20:56:24 -07:00
msync.c
…
nommu.c
mm: remove follow_pfn
2024-04-25 20:56:12 -07:00
oom_kill.c
memory: remove the now superfluous sentinel element from ctl_table array
2024-04-25 20:56:32 -07:00
page_alloc.c
mm: page_alloc: allowing mTHP compaction to capture the freed page directly
2024-05-05 17:53:37 -07:00
page_counter.c
…
page_ext.c
mm: make page_ext_get() take a const argument
2024-04-25 20:56:14 -07:00
page_idle.c
…
page_io.c
mm: add per-order mTHP anon_swpout and anon_swpout_fallback counters
2024-05-05 17:53:35 -07:00
page_isolation.c
mm: page_isolation: prepare for hygienic freelists
2024-04-25 20:56:04 -07:00
page_owner.c
mm: introduce slabobj_ext to support slab object extensions
2024-04-25 20:55:51 -07:00
page_poison.c
mm/page_poison: replace kmap_atomic() with kmap_local_page()
2023-12-10 16:51:50 -08:00
page_reporting.c
mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER
2024-01-08 15:27:15 -08:00
page_reporting.h
…
page_table_check.c
mm/page_table_check: support userfault wr-protect entries
2024-05-05 17:53:41 -07:00
page_vma_mapped.c
mm: make page_mapped_in_vma conditional on CONFIG_MEMORY_FAILURE
2024-05-05 17:53:45 -07:00
page-writeback.c
mm: remove stale comment __folio_mark_dirty
2024-05-05 17:53:53 -07:00
pagewalk.c
mm: pagewalk: assert write mmap lock only for walking the user page tables
2023-12-10 16:51:53 -08:00
percpu-internal.h
mm: percpu: add codetag reference into pcpuobj_ext
2024-04-25 20:55:56 -07:00
percpu-km.c
…
percpu-stats.c
…
percpu-vm.c
percpu: clean up all mappings when pcpu_map_pages() fails
2024-04-25 20:55:49 -07:00
percpu.c
mm: percpu: enable per-cpu allocation tagging
2024-04-25 20:55:56 -07:00
pgalloc-track.h
…
pgtable-generic.c
…
process_vm_access.c
mm: fix process_vm_rw page counts
2023-12-10 16:51:39 -08:00
ptdump.c
mm: ptdump: add check_wx_pages debugfs attribute
2024-02-22 10:24:47 -08:00
readahead.c
mm/readahead: break read-ahead loop if filemap_add_folio return -ENOMEM
2024-04-25 20:56:07 -07:00
rmap.c
mm/rmap: change the type of we_locked from int to bool
2024-05-05 17:53:56 -07:00
rodata_test.c
…
secretmem.c
…
shmem_quota.c
tmpfs: fix race on handling dquot rbtree
2024-03-26 11:07:23 -07:00
shmem.c
mm: switch mm->get_unmapped_area() to a flag
2024-04-25 20:56:25 -07:00
show_mem.c
lib: add memory allocations report in show_mem()
2024-04-25 20:55:57 -07:00
shrinker_debug.c
mm: shrinker: convert shrinker_rwsem to mutex
2023-10-04 10:32:26 -07:00
shrinker.c
mm: shrinker: use kvzalloc_node() from expand_one_shrinker_info()
2024-01-05 09:58:32 -08:00
shuffle.c
…
shuffle.h
mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER
2024-01-08 15:27:15 -08:00
slab_common.c
mm/slab: enable slab allocation tagging for kmalloc and friends
2024-04-25 20:55:55 -07:00
slab.h
memcg: simple cleanup of stats update functions
2024-05-05 17:53:44 -07:00
slub.c
mm, slab: move slab_memcg hooks to mm/memcontrol.c
2024-04-25 20:56:16 -07:00
sparse-vmemmap.c
…
sparse.c
mm/sparse: guard the size of mem_section is power of 2
2024-05-05 17:53:40 -07:00
swap_cgroup.c
…
swap_slots.c
mm: swap: update get_swap_pages() to take folio order
2024-04-25 20:56:37 -07:00
swap_state.c
mm: remove struct page from get_shadow_from_swap_cache
2024-04-25 20:56:40 -07:00
swap.c
mm: add kernel-doc for folio_mark_accessed()
2024-05-05 17:53:50 -07:00
swap.h
mm/swap: fix race when skipping swapcache
2024-02-20 14:20:48 -08:00
swapfile.c
mm/swapfile: mark racy access on si->highest_bit
2024-05-05 17:53:57 -07:00
truncate.c
mm: convert pagecache_isize_extended to use a folio
2024-04-25 20:56:43 -07:00
usercopy.c
…
userfaultfd.c
mm: fix some minor per-VMA lock issues in userfaultfd
2024-05-05 17:53:54 -07:00
util.c
mm: switch mm->get_unmapped_area() to a flag
2024-04-25 20:56:25 -07:00
vmalloc.c
mm: vmalloc: dump page owner info if page is already mapped
2024-05-05 17:53:51 -07:00
vmpressure.c
eventfd: simplify eventfd_signal()
2023-11-28 14:08:38 +01:00
vmscan.c
mm: add per-order mTHP anon_swpout and anon_swpout_fallback counters
2024-05-05 17:53:35 -07:00
vmstat.c
mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER
2024-01-08 15:27:15 -08:00
workingset.c
mm: move mapping_set_update out of <linux/swap.h>
2024-02-21 11:36:50 +05:30
z3fold.c
mm: zpool: return pool size in pages
2024-04-25 20:55:48 -07:00
zbud.c
mm: zpool: return pool size in pages
2024-04-25 20:55:48 -07:00
zpool.c
mm: zpool: return pool size in pages
2024-04-25 20:55:48 -07:00
zsmalloc.c
mm: zpool: return pool size in pages
2024-04-25 20:55:48 -07:00
zswap.c
mm: zswap: remove same_filled module params
2024-05-05 17:53:38 -07:00