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Huang Ying d4a34d7fb4 mm,swap: add document about RCU read lock and swapoff interaction 
During reviewing a patch to fix the race condition between
free_swap_and_cache() and swapoff() [1], it was found that the document
about how to prevent racing with swapoff isn't clear enough.  Especially
RCU read lock can prevent swapoff from freeing data structures.  So, the
document is added as comments.

[1] https://lore.kernel.org/linux-mm/c8fe62d0-78b8-527a-5bef-ee663ccdc37a@huawei.com/

Link: https://lkml.kernel.org/r/20240407065450.498821-1-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-05-05 17:53:26 -07:00
..
damon
mm: madvise: pageout: ignore references rather than clearing young
2024-03-04 17:01:18 -08:00
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
mm: backing-dev: use group allocation/free of per-cpu counters API
2024-04-25 20:56:12 -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: switch mm->get_unmapped_area() to a flag
2024-04-25 20:56:25 -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
mm/early_ioremap.c: improve the execution efficiency of early_ioremap_setup()
2023-06-09 16:25:56 -07:00
fadvise.c
mm: remove unnecessary pagevec includes
2023-06-23 16:59:31 -07:00
fail_page_alloc.c
mm: page_alloc: split out FAIL_PAGE_ALLOC
2023-06-09 16:25:23 -07:00
failslab.c
…
filemap.c
mm: use "GUP-fast" instead "fast GUP" in remaining comments
2024-04-25 20:56:41 -07:00
folio-compat.c
mm: remove __set_page_dirty_nobuffers()
2024-04-25 20:56:25 -07:00
gup_test.c
Merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes.
2023-06-23 16:58:19 -07:00
gup_test.h
…
gup.c
mm/treewide: rename CONFIG_HAVE_FAST_GUP to CONFIG_HAVE_GUP_FAST
2024-04-25 20:56:41 -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: swap: remove CLUSTER_FLAG_HUGE from swap_cluster_info:flags
2024-04-25 20:56:36 -07:00
hugetlb_cgroup.c
mm, hugetlb: remove HUGETLB_CGROUP_MIN_ORDER
2023-10-18 14:34:17 -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: pass correct order_per_bit to cma_declare_contiguous_nid
2024-04-25 20:56:43 -07:00
hwpoison-inject.c
…
init-mm.c
mm: Deprecate pasid field
2023-12-12 10:11:32 +01:00
internal.h
mm: convert free_zone_device_page to free_zone_device_folio
2024-04-25 20:56:44 -07:00
interval_tree.c
…
io-mapping.c
…
ioremap.c
mm: ioremap: remove unneeded ioremap_allowed and iounmap_allowed
2023-08-18 10:12:36 -07:00
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: use "GUP-fast" instead "fast GUP" in remaining comments
2024-04-25 20:56:41 -07:00
kmemleak.c
mm/kmemleak: compact kmemleak_object further
2024-04-25 20:56:05 -07:00
ksm.c
mm: convert page_try_share_anon_rmap() to folio_try_share_anon_rmap_[pte|pmd]()
2023-12-29 11:58:56 -08:00
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: avoid split during MADV_PAGEOUT and MADV_COLD
2024-04-25 20:56:38 -07:00
Makefile
mm/kmemleak: disable KASAN instrumentation in kmemleak
2024-04-25 20:56:05 -07:00
mapping_dirty_helpers.c
mm: fix clean_record_shared_mapping_range kernel-doc
2023-08-24 16:20:30 -07:00
memblock.c
cxl fixes for 6.8-rc6
2024-02-24 15:53:40 -08:00
memcontrol.c
mm, slab: move slab_memcg hooks to mm/memcontrol.c
2024-04-25 20:56:16 -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: record the migration reason for struct migration_target_control
2024-04-25 20:56:06 -07:00
memory-failure.c
memory: remove the now superfluous sentinel element from ctl_table array
2024-04-25 20:56:32 -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: madvise: avoid split during MADV_PAGEOUT and MADV_COLD
2024-04-25 20:56:38 -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 free_zone_device_page to free_zone_device_folio
2024-04-25 20:56:44 -07:00
memtest.c
memtest: use {READ,WRITE}_ONCE in memory scanning
2024-03-13 12:12:21 -07:00
migrate_device.c
mm: convert migrate_vma_collect_pmd to use a folio
2024-04-25 20:56:19 -07:00
migrate.c
remove references to page->flags in documentation
2024-04-25 20:56:15 -07:00
mincore.c
mm: enable page walking API to lock vmas during the walk
2023-08-21 13:07:20 -07:00
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
mmu_notifiers: rename invalidate_range notifier
2023-08-18 10:12:41 -07:00
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: inline destroy_large_folio() into __folio_put_large()
2024-04-25 20:56:44 -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
arm64: mm: swap: support THP_SWAP on hardware with MTE
2024-04-25 20:56:07 -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: convert page_table_check_pte_set() to page_table_check_ptes_set()
2023-08-24 16:20:18 -07:00
page_vma_mapped.c
mm: rename vma_pgoff_address back to vma_address
2024-04-25 20:56:31 -07:00
page-writeback.c
memory: remove the now superfluous sentinel element from ctl_table array
2024-04-25 20:56:32 -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
mm/pgtable: notes on pte_offset_map[_lock]()
2023-08-18 10:12:25 -07:00
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: rename vma_pgoff_address back to vma_address
2024-04-25 20:56:31 -07:00
rodata_test.c
…
secretmem.c
mm/secretmem: use a folio in secretmem_fault()
2023-08-21 13:38:02 -07:00
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
mm, slab: move slab_memcg hooks to mm/memcontrol.c
2024-04-25 20:56:16 -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
mm/vmemmap: allow architectures to override how vmemmap optimization works
2023-08-18 10:12:53 -07:00
sparse.c
mm: move array mem_section init code out of memory_present()
2024-04-25 20:56:16 -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: convert free_zone_device_page to free_zone_device_folio
2024-04-25 20:56:44 -07:00
swap.h
mm/swap: fix race when skipping swapcache
2024-02-20 14:20:48 -08:00
swapfile.c
mm,swap: add document about RCU read lock and swapoff interaction
2024-05-05 17:53:26 -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: add pmd_folio()
2024-04-25 20:56:19 -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.c: optimize to reduce arguments of alloc_vmap_area()
2024-04-25 20:56:08 -07:00
vmpressure.c
eventfd: simplify eventfd_signal()
2023-11-28 14:08:38 +01:00
vmscan.c
mm: vmscan: avoid split during shrink_folio_list()
2024-04-25 20:56:38 -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
zswap: replace RB tree with xarray
2024-04-25 20:56:18 -07:00