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David Hildenbrand 84d60fdd37 mm: slightly clarify KSM logic in do_swap_page() 
Let's make it clearer that KSM might only have to copy a page in case we
have a page in the swapcache, not if we allocated a fresh page and
bypassed the swapcache.  While at it, add a comment why this is usually
necessary and merge the two swapcache conditions.

[akpm@linux-foundation.org: fix comment, per David]

Link: https://lkml.kernel.org/r/20220131162940.210846-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Don Dutile <ddutile@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Liang Zhang <zhangliang5@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-03-24 19:06:50 -07:00
..
damon
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
kasan
kasan: disable LOCKDEP when printing reports
2022-03-24 19:06:50 -07:00
kfence
kfence: allow use of a deferrable timer
2022-03-22 15:57:11 -07:00
backing-dev.c
remove congestion tracking framework
2022-03-22 15:57:01 -07:00
balloon_compaction.c
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
bootmem_info.c
bootmem: Use page->index instead of page->freelist
2022-01-06 12:27:03 +01:00
cma_debug.c
mm/cma: change cma mutex to irq safe spinlock
2021-05-05 11:27:21 -07:00
cma_sysfs.c
mm: cma: support sysfs
2021-05-05 11:27:24 -07:00
cma.c
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -07:00
cma.h
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -07:00
compaction.c
mm: compaction: cleanup the compaction trace events
2022-03-22 15:57:09 -07:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm/debug_vm_pgtable: remove pte entry from the page table
2022-02-04 09:25:04 -08:00
debug.c
mm: unexport page_init_poison
2022-03-24 19:06:45 -07:00
dmapool.c
mm/dmapool.c: revert "make dma pool to use kmalloc_node"
2022-01-15 16:30:28 +02:00
early_ioremap.c
mm/early_ioremap: declare early_memremap_pgprot_adjust()
2022-03-22 15:57:11 -07:00
fadvise.c
remove inode_congested()
2022-03-22 15:57:01 -07:00
failslab.c
…
filemap.c
mm: filemap_unaccount_folio() large skip mapcount fixup
2022-03-24 19:06:45 -07:00
folio-compat.c
mm/rmap: Convert rmap_walk() to take a folio
2022-03-21 13:01:35 -04:00
frontswap.c
frontswap: remove support for multiple ops
2022-01-22 08:33:38 +02:00
gup_test.c
selftests/vm: gup_test: test faulting in kernel, and verify pinnable pages
2021-05-05 11:27:26 -07:00
gup_test.h
selftests/vm: gup_test: fix test flag
2021-05-05 11:27:26 -07:00
gup.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
highmem.c
mm/highmem: remove unnecessary done label
2022-03-22 15:57:11 -07:00
hmm.c
mm/hmm.c: remove unneeded local variable ret
2022-03-22 15:57:12 -07:00
huge_memory.c
mm/huge_memory: make is_transparent_hugepage() static
2022-03-24 19:06:50 -07:00
hugetlb_cgroup.c
hugetlb: add hugetlb.*.numa_stat file
2022-01-15 16:30:29 +02:00
hugetlb_vmemmap.c
mm: hugetlb: replace hugetlb_free_vmemmap_enabled with a static_key
2022-03-22 15:57:08 -07:00
hugetlb_vmemmap.h
mm: hugetlb: introduce nr_free_vmemmap_pages in the struct hstate
2021-06-30 20:47:25 -07:00
hugetlb.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
hwpoison-inject.c
mm/hwpoison: avoid the impact of hwpoison_filter() return value on mce handler
2022-03-22 15:57:07 -07:00
init-mm.c
kernel/fork: Initialize mm's PASID
2022-02-14 19:51:47 +01:00
internal.h
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
interval_tree.c
mm/interval_tree: add comments to improve code readability
2021-04-30 11:20:38 -07:00
io-mapping.c
mm: add a io_mapping_map_user helper
2021-04-30 11:20:39 -07:00
ioremap.c
mm: move ioremap_page_range to vmalloc.c
2021-09-08 11:50:24 -07:00
Kconfig
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
Kconfig.debug
mm: page table check
2022-01-15 16:30:28 +02:00
khugepaged.c
mm/rmap: Convert try_to_unmap() to take a folio
2022-03-21 12:59:03 -04:00
kmemleak.c
mm/kmemleak: avoid scanning potential huge holes
2022-02-04 09:25:05 -08:00
ksm.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
list_lru.c
mm/list_lru: optimize memcg_reparent_list_lru_node()
2022-03-22 15:57:08 -07:00
maccess.c
asm-generic updates for 5.18
2022-03-23 18:03:08 -07:00
madvise.c
mm: enable MADV_DONTNEED for hugetlb mappings
2022-03-24 19:06:50 -07:00
Makefile
mm: move the migrate_vma_* device migration code into its own file
2022-03-03 12:47:33 -05:00
mapping_dirty_helpers.c
mm: move tlb_flush_pending inline helpers to mm_inline.h
2022-01-15 16:30:27 +02:00
memblock.c
memblock: use kfree() to release kmalloced memblock regions
2022-02-20 08:45:39 +02:00
memcontrol.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
memfd.c
memfd: fix F_SEAL_WRITE after shmem huge page allocated
2022-03-05 11:08:32 -08:00
memory_hotplug.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
memory-failure.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
memory.c
mm: slightly clarify KSM logic in do_swap_page()
2022-03-24 19:06:50 -07:00
mempolicy.c
mempolicy: mbind_range() set_policy() after vma_merge()
2022-03-22 15:57:09 -07:00
mempool.c
mm: remove spurious blkdev.h includes
2021-10-18 06:17:01 -06:00
memremap.c
mm: delete __ClearPageWaiters()
2022-03-24 19:06:45 -07:00
memtest.c
…
migrate_device.c
mm/migrate: Convert remove_migration_ptes() to folios
2022-03-21 13:01:35 -04:00
migrate.c
mm/migration: add trace events for base page and HugeTLB migrations
2022-03-24 19:06:45 -07:00
mincore.c
inode: make init and permission helpers idmapped mount aware
2021-01-24 14:27:16 +01:00
mlock.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
mm_init.c
include/linux/page-flags-layout.h: cleanups
2021-04-30 11:20:42 -07:00
mmap_lock.c
mm: mmap_lock: fix disabling preemption directly
2021-07-23 17:43:28 -07:00
mmap.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
mmu_gather.c
mm: move tlb_flush_pending inline helpers to mm_inline.h
2022-01-15 16:30:27 +02:00
mmu_notifier.c
mm/mmu_notifiers: ensure range_end() is paired with range_start()
2021-03-25 09:22:55 -07:00
mmzone.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
mprotect.c
memory tiering: skip to scan fast memory
2022-03-22 15:57:09 -07:00
mremap.c
mm/mremap:: use vma_lookup() instead of find_vma()
2022-03-22 15:57:05 -07:00
msync.c
mm/msync: exit early when the flags is an MS_ASYNC and start < vm_start
2021-04-30 11:20:37 -07:00
nommu.c
Merge branch 'akpm' (patches from Andrew)
2021-11-06 14:08:17 -07:00
oom_kill.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
page_alloc.c
kasan, page_alloc: allow skipping memory init for HW_TAGS
2022-03-24 19:06:47 -07:00
page_counter.c
mm/page_counter: remove an incorrect call to propagate_protected_usage()
2022-01-15 16:30:27 +02:00
page_ext.c
mm: make some vars and functions static or __init
2022-01-15 16:30:31 +02:00
page_idle.c
mm/rmap: Constify the rmap_walk_control argument
2022-03-21 13:01:35 -04:00
page_io.c
Filesystem folio changes for 5.18
2022-03-22 18:26:56 -07:00
page_isolation.c
Revert "mm/page_isolation: unset migratetype directly for non Buddy page"
2022-02-04 09:25:04 -08:00
page_owner.c
mm/page_owner.c: record tgid
2022-03-24 19:06:44 -07:00
page_poison.c
mm: page_poison: print page info when corruption is caught
2021-04-30 11:20:36 -07:00
page_reporting.c
mm/page_reporting: allow driver to specify reporting order
2021-06-29 10:53:47 -07:00
page_reporting.h
mm/page_reporting: export reporting order as module parameter
2021-06-29 10:53:47 -07:00
page_table_check.c
mm/page_table_check.c: use strtobool for param parsing
2022-03-22 15:57:11 -07:00
page_vma_mapped.c
mm: Convert page_vma_mapped_walk to work on PFNs
2022-03-21 12:59:02 -04:00
page-writeback.c
Filesystem folio changes for 5.18
2022-03-22 18:26:56 -07:00
pagewalk.c
mm: pagewalk: fix walk for hugepage tables
2021-06-29 10:53:49 -07:00
percpu-internal.h
mm: memcg/percpu: account extra objcg space to memory cgroups
2022-01-15 16:30:31 +02:00
percpu-km.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu-stats.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
percpu-vm.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu.c
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
pgalloc-track.h
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
pgtable-generic.c
mm: move tlb_flush_pending inline helpers to mm_inline.h
2022-01-15 16:30:27 +02:00
process_vm_access.c
mm/process_vm_access.c: remove duplicate include
2021-05-05 11:27:27 -07:00
ptdump.c
mm: sparsemem: use page table lock to protect kernel pmd operations
2022-03-22 15:57:08 -07:00
readahead.c
Filesystem folio changes for 5.18
2022-03-22 18:26:56 -07:00
rmap.c
mm/migration: add trace events for base page and HugeTLB migrations
2022-03-24 19:06:45 -07:00
rodata_test.c
mm/rodata_test.c: fix missing function declaration
2020-08-21 09:52:53 -07:00
secretmem.c
fs: Convert __set_page_dirty_no_writeback to noop_dirty_folio
2022-03-16 13:37:05 -04:00
shmem.c
Filesystem folio changes for 5.18
2022-03-22 18:26:56 -07:00
shuffle.c
mm: eliminate "expecting prototype" kernel-doc warnings
2021-04-16 16:10:36 -07:00
shuffle.h
mm/shuffle: fix section mismatch warning
2021-05-22 15:09:07 -10:00
slab_common.c
mm/slab_common: use helper function is_power_of_2()
2022-02-21 11:38:12 +01:00
slab.c
mm: introduce kmem_cache_alloc_lru
2022-03-22 15:57:03 -07:00
slab.h
mm: introduce kmem_cache_alloc_lru
2022-03-22 15:57:03 -07:00
slob.c
slab updates for 5.18
2022-03-23 12:33:21 -07:00
slub.c
slab updates for 5.18
2022-03-23 12:33:21 -07:00
sparse-vmemmap.c
mm: sparsemem: move vmemmap related to HugeTLB to CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
2022-03-22 15:57:08 -07:00
sparse.c
mm/sparse: make mminit_validate_memmodel_limits() static
2022-03-22 15:57:05 -07:00
swap_cgroup.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
swap_slots.c
treewide: Add missing includes masked by cgroup -> bpf dependency
2021-12-03 10:58:13 -08:00
swap_state.c
Filesystem folio changes for 5.18
2022-03-22 18:26:56 -07:00
swap.c
mm: delete __ClearPageWaiters()
2022-03-24 19:06:45 -07:00
swapfile.c
userfaultfd: provide unmasked address on page-fault
2022-03-22 15:57:08 -07:00
truncate.c
Filesystem folio changes for 5.18
2022-03-22 18:26:56 -07:00
usercopy.c
Merge branch 'akpm' (patches from Andrew)
2022-03-22 16:11:53 -07:00
userfaultfd.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
util.c
ARM:
2022-03-24 11:58:57 -07:00
vmacache.c
…
vmalloc.c
kasan, vmalloc: only tag normal vmalloc allocations
2022-03-24 19:06:48 -07:00
vmpressure.c
mm/vmpressure: fix data-race with memcg->socket_pressure
2021-11-06 13:30:40 -07:00
vmscan.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
vmstat.c
mm: only re-generate demotion targets when a numa node changes its N_CPU state
2022-03-22 15:57:11 -07:00
workingset.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
z3fold.c
mm/z3fold: add kerneldoc fields for z3fold_pool
2021-07-01 11:06:03 -07:00
zbud.c
mm/zbud: add kerneldoc fields for zbud_pool
2021-07-01 11:06:03 -07:00
zpool.c
zpool: remove the list of pools_head
2022-01-15 16:30:31 +02:00
zsmalloc.c
zsmalloc: replace get_cpu_var with local_lock
2022-01-22 08:33:37 +02:00
zswap.c
mm/zswap.c: allow handling just same-value filled pages
2022-03-22 15:57:11 -07:00