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linux/mm
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Kiryl Shutsemau 19773df031 mm/fault: try to map the entire file folio in finish_fault() 
finish_fault() uses per-page fault for file folios.  This only occurs for
file folios smaller than PMD_SIZE.

The comment suggests that this approach prevents RSS inflation.  However,
it only prevents RSS accounting.  The folio is still mapped to the
process, and the fact that it is mapped by a single PTE does not affect
memory pressure.  Additionally, the kernel's ability to map large folios
as PMD if they are large enough does not support this argument.

When possible, map large folios in one shot.  This reduces the number of
minor page faults and allows for TLB coalescing.

Mapping large folios at once will allow the rmap code to mlock it on add,
as it will recognize that it is fully mapped and mlocking is safe.

Link: https://lkml.kernel.org/r/20250923110711.690639-5-kirill@shutemov.name
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-09-28 11:51:30 -07:00
..
damon mm/damon/sysfs: set damon_ctx->min_sz_region only for paddr use case 2025-09-23 14:14:16 -07:00
kasan kasan: apply write-only mode in kasan kunit testcases 2025-09-21 14:22:10 -07:00
kfence kfence: drop nth_page() usage 2025-09-21 14:22:09 -07:00
kmsan kmsan: test: add module description 2025-06-05 22:02:25 -07:00
backing-dev.c mm: replace (20 - PAGE_SHIFT) with common macros for pages<->MB conversion 2025-09-13 16:54:42 -07:00
balloon_compaction.c mm/migrate: fix NULL movable_ops if CONFIG_ZSMALLOC=m 2025-08-19 16:35:57 -07:00
bootmem_info.c mm/sparse: allow for alternate vmemmap section init at boot 2025-03-16 22:06:27 -07:00
cma.c mm/cma: refuse handing out non-contiguous page ranges 2025-09-21 14:22:06 -07:00
cma.h mm: cma: set early_pfn and bitmap as a union in cma_memrange 2025-05-22 14:55:36 -07:00
cma_debug.c mm: cma: simplify cma_maxchunk_get() 2025-07-24 19:12:36 -07:00
cma_sysfs.c mm/cma: export total and free number of pages for CMA areas 2025-03-16 22:06:24 -07:00
compaction.c mm/compaction: fix low_pfn advance on isolating hugetlb 2025-09-28 11:51:29 -07:00
debug.c mm: convert core mm to mm_flags_*() accessors 2025-09-13 16:54:56 -07:00
debug_page_alloc.c mm/debug_page_alloc: improve error message for invalid guardpage minorder 2025-05-12 23:50:38 -07:00
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: clear page table entries at destroy_args() 2025-08-19 16:35:54 -07:00
dmapool.c docs: dma-api: replace consistent with coherent 2025-07-01 13:25:36 -06:00
dmapool_test.c
early_ioremap.c mm/early_ioremap: add null pointer checks to prevent NULL-pointer dereference 2025-01-13 22:40:59 -08:00
execmem.c mm: correct type for vmalloc vm_flags fields 2025-08-02 12:06:13 -07:00
fadvise.c
fail_page_alloc.c
failslab.c
filemap.c mm, swap: cleanup swap cache API and add kerneldoc 2025-09-21 14:22:23 -07:00
folio-compat.c mm: Remove grab_cache_page_write_begin() 2025-03-04 17:02:25 +00:00
gup.c mm/gup: fix handling of errors from arch_make_folio_accessible() in follow_page_pte() 2025-09-21 14:22:29 -07:00
gup_test.c
gup_test.h
highmem.c mm: constify highmem related functions for improved const-correctness 2025-09-21 14:22:15 -07:00
hmm.c mm/hmm: populate PFNs from PMD swap entry 2025-09-21 14:22:29 -07:00
huge_memory.c mm: skip mlocked THPs that are underused early in deferred_split_scan() 2025-09-21 14:22:30 -07:00
hugetlb.c mm: hugeltb: check NUMA_NO_NODE in only_alloc_fresh_hugetlb_folio() 2025-09-21 14:22:12 -07:00
hugetlb_cgroup.c page_counter: track failcnt only for legacy cgroups 2025-03-17 00:05:35 -07:00
hugetlb_cma.c mm: hugetlb: directly pass order when allocate a hugetlb folio 2025-09-21 14:22:11 -07:00
hugetlb_cma.h mm: hugetlb: directly pass order when allocate a hugetlb folio 2025-09-21 14:22:11 -07:00
hugetlb_vmemmap.c mm/pagewalk: split walk_page_range_novma() into kernel/user parts 2025-07-09 22:42:05 -07:00
hugetlb_vmemmap.h mm/hugetlb: do pre-HVO for bootmem allocated pages 2025-03-16 22:06:29 -07:00
hwpoison-inject.c mm/hwpoison: decouple hwpoison_filter from mm/memory-failure.c 2025-09-21 14:22:21 -07:00
init-mm.c mm: replace vm_lock and detached flag with a reference count 2025-03-16 22:06:20 -07:00
internal.h mm: specify separate file and vm_file params in vm_area_desc 2025-09-22 20:17:11 -07:00
interval_tree.c
ioremap.c mm/ioremap: pass pgprot_t to ioremap_prot() instead of unsigned long 2025-03-16 22:06:23 -07:00
Kconfig mm: stop making SPARSEMEM_VMEMMAP user-selectable 2025-09-21 14:22:00 -07:00
Kconfig.debug mm: rename GENERIC_PTDUMP and PTDUMP_CORE 2025-03-17 00:05:32 -07:00
khugepaged.c mm/khugepaged: do not fail collapse_pte_mapped_thp() on SCAN_PMD_NULL 2025-09-23 14:14:15 -07:00
kmemleak.c mm: fix possible deadlock in kmemleak 2025-09-01 17:11:37 -07:00
ksm.c ksm: use a folio inside cmp_and_merge_page() 2025-09-23 14:14:16 -07:00
list_lru.c mm, list_lru: refactor the locking code 2025-07-09 22:41:56 -07:00
maccess.c mm: unexport globally copy_to_kernel_nofault 2025-07-09 22:42:22 -07:00
madvise.c mm/mseal: small cleanups 2025-08-02 12:06:09 -07:00
Makefile mm: remove unused zpool layer 2025-09-21 14:21:59 -07:00
mapping_dirty_helpers.c mm: remove redundant pXd_devmap calls 2025-07-09 22:42:17 -07:00
memblock.c memblock: fix kernel-doc for MEMBLOCK_RSRV_NOINIT 2025-08-26 10:47:03 +03:00
memcontrol-v1.c mm/memcg: v1: account event registrations and drop world-writable cgroup.event_control 2025-09-21 14:22:26 -07:00
memcontrol-v1.h memcg: move do_memsw_account() to CONFIG_MEMCG_V1 2025-03-21 22:03:11 -07:00
memcontrol.c mm/hwpoison: decouple hwpoison_filter from mm/memory-failure.c 2025-09-21 14:22:21 -07:00
memfd.c mm/memfd: remove redundant casts 2025-09-21 14:22:00 -07:00
memory-failure.c mm, swap: cleanup swap cache API and add kerneldoc 2025-09-21 14:22:23 -07:00
memory-tiers.c mm: re-enable kswapd when memory pressure subsides or demotion is toggled 2025-09-21 14:22:29 -07:00
memory.c mm/fault: try to map the entire file folio in finish_fault() 2025-09-28 11:51:30 -07:00
memory_hotplug.c mm/memremap: remove unused get_dev_pagemap() parameter 2025-09-21 14:22:21 -07:00
mempolicy.c mm: split folio_pte_batch() into folio_pte_batch() and folio_pte_batch_flags() 2025-07-19 18:59:45 -07:00
mempool.c mm: mempool: fix crash in mempool_free() for zero-minimum pools 2025-08-02 12:06:13 -07:00
memremap.c mm/memremap: remove unused get_dev_pagemap() parameter 2025-09-21 14:22:21 -07:00
memtest.c
migrate.c mm, swap: use the swap table for the swap cache and switch API 2025-09-21 14:22:24 -07:00
migrate_device.c treewide: remove MIGRATEPAGE_SUCCESS 2025-09-13 16:54:50 -07:00
mincore.c mm, swap: use unified helper for swap cache look up 2025-09-21 14:22:22 -07:00
mlock.c mm: folio_may_be_lru_cached() unless folio_test_large() 2025-09-13 13:05:36 -07:00
mm_init.c mm/mm_init: make memmap_init_compound() look more like prep_compound_page() 2025-09-21 14:22:03 -07:00
mm_slot.h
mmap.c mm: specify separate file and vm_file params in vm_area_desc 2025-09-22 20:17:11 -07:00
mmap_lock.c mm: change vma_start_read() to drop RCU lock on failure 2025-09-13 16:54:43 -07:00
mmu_gather.c mm: remove redundant __GFP_NOWARN 2025-09-13 16:54:58 -07:00
mmu_notifier.c Update Christoph's Email address and make it consistent 2025-05-12 23:50:31 -07:00
mmzone.c mm: introduce memdesc_flags_t 2025-09-13 16:55:07 -07:00
mprotect.c mm: pass page directly instead of using folio_page 2025-08-11 23:00:59 -07:00
mremap.c mm/mremap: fix regression in vrm->new_addr check 2025-09-08 23:45:11 -07:00
mseal.c mm/mseal: rework mseal apply logic 2025-08-02 12:06:09 -07:00
msync.c
nommu.c mm/nommu: convert kobjsize() to folios 2025-09-13 16:54:46 -07:00
numa.c mm/numa: remove unnecessary local variable in alloc_node_data() 2025-05-12 23:50:38 -07:00
numa_emulation.c mm: numa,memblock: Use SZ_1M macro to denote bytes to MB conversion 2025-08-20 16:31:23 +03:00
numa_memblks.c mm: numa,memblock: Use SZ_1M macro to denote bytes to MB conversion 2025-08-20 16:31:23 +03:00
oom_kill.c mm/oom_kill.c: fix inverted check 2025-09-23 14:14:16 -07:00
page-writeback.c mm/page-writeback: drop usage of folio_index 2025-09-13 16:55:17 -07:00
page_alloc.c mm: page_alloc: avoid kswapd thrashing due to NUMA restrictions 2025-09-23 14:14:16 -07:00
page_counter.c page_counter: track failcnt only for legacy cgroups 2025-03-17 00:05:35 -07:00
page_ext.c mm,page_ext: derive the node from the pfn 2025-07-13 16:38:16 -07:00
page_frag_cache.c mm/page_alloc: export free_frozen_pages() instead of free_unref_page() 2025-01-13 22:40:31 -08:00
page_idle.c sysfs: treewide: switch back to attribute_group::bin_attrs 2025-06-17 10:44:15 +02:00
page_io.c mm, swap: tidy up swap device and cluster info helpers 2025-09-21 14:22:23 -07:00
page_isolation.c mm/page_isolation: drop __folio_test_movable() check for large folios 2025-07-13 16:38:29 -07:00
page_owner.c mm/page_owner: convert set_page_owner_migrate_reason() to folios 2025-07-19 18:59:57 -07:00
page_poison.c
page_reporting.c
page_reporting.h
page_table_check.c mm/page_table_check: Batch-check pmds/puds just like ptes 2025-05-09 13:43:07 +01:00
page_vma_mapped.c mm/page_vma_mapped: track if the page is mapped across page table boundary 2025-09-28 11:51:29 -07:00
pagewalk.c mm/pagewalk: drop nth_page() usage within folio in folio_walk_start() 2025-09-21 14:22:05 -07:00
percpu-internal.h
percpu-km.c mm/mm/percpu-km: drop nth_page() usage within single allocation 2025-09-21 14:22:04 -07:00
percpu-stats.c mm: remove outdated filename comment in percpu-stats.c 2025-07-13 16:38:23 -07:00
percpu-vm.c
percpu.c percpu: fix race on alloc failed warning limit 2025-09-08 23:45:10 -07:00
pgalloc-track.h
pgtable-generic.c mm: remove redundant pXd_devmap calls 2025-07-09 22:42:17 -07:00
process_vm_access.c
pt_reclaim.c mm: pgtable: reclaim empty PTE page in madvise(MADV_DONTNEED) 2025-01-13 22:40:48 -08:00
ptdump.c mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd() 2025-07-09 22:42:20 -07:00
readahead.c readahead: add trace points 2025-09-21 14:22:28 -07:00
rmap.c mm/rmap: mlock large folios in try_to_unmap_one() 2025-09-28 11:51:30 -07:00
rodata_test.c mm/rodata_test: verify test data is unchanged, rather than non-zero 2025-01-13 22:40:38 -08:00
secretmem.c Summary of significant series in this pull request: 2025-07-31 14:57:54 -07:00
shmem.c mm/shmem: remove unused entry_order after large swapin rework 2025-09-21 14:22:30 -07:00
shmem_quota.c
show_mem.c mm: re-enable kswapd when memory pressure subsides or demotion is toggled 2025-09-21 14:22:29 -07:00
shrinker.c
shrinker_debug.c mm/shrinker: fix name consistency issue in shrinker_debugfs_rename() 2025-03-17 00:05:40 -07:00
shuffle.c
shuffle.h
slab.h slab: use memdesc_nid() 2025-09-13 16:55:08 -07:00
slab_common.c Update Christoph's Email address and make it consistent 2025-05-12 23:50:31 -07:00
slub.c alloc_tag: mark inaccurate allocation counters in /proc/allocinfo output 2025-09-21 14:22:36 -07:00
sparse-vmemmap.c mm: introduce and use {pgd,p4d}_populate_kernel() 2025-08-27 22:45:44 -07:00
sparse.c mm: introduce memdesc_nid() 2025-09-13 16:55:07 -07:00
swap.c mm: lru_add_drain_all() do local lru_add_drain() first 2025-09-21 14:22:32 -07:00
swap.h mm, swap: implement dynamic allocation of swap table 2025-09-21 14:22:25 -07:00
swap_cgroup.c mm: swap_cgroup: remove double initialization of locals 2025-03-17 22:06:58 -07:00
swap_state.c mm, swap: implement dynamic allocation of swap table 2025-09-21 14:22:25 -07:00
swap_table.h mm, swap: use a single page for swap table when the size fits 2025-09-21 14:22:25 -07:00
swapfile.c mm, swap: use a single page for swap table when the size fits 2025-09-21 14:22:25 -07:00
truncate.c - The 2 patch series "zram: support algorithm-specific parameters" from 2025-06-02 16:00:26 -07:00
usercopy.c mm: security: Check early if HARDENED_USERCOPY is enabled 2025-02-28 11:51:31 -08:00
userfaultfd.c mm, swap: use unified helper for swap cache look up 2025-09-21 14:22:22 -07:00
util.c mm: do not assume file == vma->vm_file in compat_vma_mmap_prepare() 2025-09-22 20:17:11 -07:00
vma.c mm: specify separate file and vm_file params in vm_area_desc 2025-09-22 20:17:11 -07:00
vma.h mm: specify separate file and vm_file params in vm_area_desc 2025-09-22 20:17:11 -07:00
vma_exec.c mm/vma: use vmg->target to specify target VMA for new VMA merge 2025-07-09 22:42:11 -07:00
vma_init.c mm: fix typos in VMA comments 2025-09-13 16:55:02 -07:00
vma_internal.h mm/vma: move brk() internals to mm/vma.c 2025-01-13 22:40:42 -08:00
vmalloc.c mm/vmalloc: move resched point into alloc_vmap_area() 2025-09-23 14:14:16 -07:00
vmpressure.c memcg: convert memcg->socket_pressure to u64 2025-07-24 19:12:32 -07:00
vmscan.c mm: re-enable kswapd when memory pressure subsides or demotion is toggled 2025-09-21 14:22:29 -07:00
vmstat.c mm: re-enable kswapd when memory pressure subsides or demotion is toggled 2025-09-21 14:22:29 -07:00
workingset.c mm: introduce memdesc_flags_t 2025-09-13 16:55:07 -07:00
zpdesc.h mm: zpdesc: minor naming and comment corrections 2025-09-21 14:21:59 -07:00
zsmalloc.c mm: remove unused zpool layer 2025-09-21 14:21:59 -07:00
zswap.c mm, swap: remove contention workaround for swap cache 2025-09-21 14:22:25 -07:00