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Yu Zhao 8788f67814 mm: add vma_has_recency() 
Add vma_has_recency() to indicate whether a VMA may exhibit temporal
locality that the LRU algorithm relies on.

This function returns false for VMAs marked by VM_SEQ_READ or
VM_RAND_READ.  While the former flag indicates linear access, i.e., a
special case of spatial locality, both flags indicate a lack of temporal
locality, i.e., the reuse of an area within a relatively small duration.

"Recency" is chosen over "locality" to avoid confusion between temporal
and spatial localities.

Before this patch, the active/inactive LRU only ignored the accessed bit
from VMAs marked by VM_SEQ_READ.  After this patch, the active/inactive
LRU and MGLRU share the same logic: they both ignore the accessed bit if
vma_has_recency() returns false.

For the active/inactive LRU, the following fio test showed a [6, 8]%
increase in IOPS when randomly accessing mapped files under memory
pressure.

  kb=$(awk '/MemTotal/ { print $2 }' /proc/meminfo)
  kb=$((kb - 8*1024*1024))

  modprobe brd rd_nr=1 rd_size=$kb
  dd if=/dev/zero of=/dev/ram0 bs=1M

  mkfs.ext4 /dev/ram0
  mount /dev/ram0 /mnt/
  swapoff -a

  fio --name=test --directory=/mnt/ --ioengine=mmap --numjobs=8 \
      --size=8G --rw=randrw --time_based --runtime=10m \
      --group_reporting

The discussion that led to this patch is here [1].  Additional test
results are available in that thread.

[1] https://lore.kernel.org/r/Y31s%2FK8T85jh05wH@google.com/

Link: https://lkml.kernel.org/r/20221230215252.2628425-1-yuzhao@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrea Righi <andrea.righi@canonical.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michael Larabel <Michael@MichaelLarabel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-01-18 17:12:57 -08:00
..
damon mm/damon/vaddr: convert hugetlb related functions to use a folio 2023-01-18 17:12:53 -08:00
kasan mm/kasan: simplify and refine kasan_cache code 2023-01-18 17:12:55 -08:00
kfence hardening updates for v6.2-rc1 2022-12-14 12:20:00 -08:00
kmsan kmsan: export kmsan_handle_urb 2022-12-21 14:31:52 -08:00
backing-dev.c mm: add /sys/class/bdi/<bdi>/min_ratio_fine knob 2022-11-30 15:59:06 -08:00
balloon_compaction.c
bootmem_info.c
cma.c cma: tracing: print alloc result in trace_cma_alloc_finish 2023-01-18 17:12:41 -08:00
cma.h
cma_debug.c
cma_sysfs.c
compaction.c mm, compaction: fix fast_isolate_around() to stay within boundaries 2022-11-30 15:59:07 -08:00
debug.c mm,thp,rmap: simplify compound page mapcount handling 2022-11-30 15:58:46 -08:00
debug_page_ref.c
debug_vm_pgtable.c mm: remove unused savedwrite infrastructure 2022-11-30 15:58:49 -08:00
dmapool.c
early_ioremap.c
fadvise.c mm/fadvise: use LLONG_MAX instead of -1 for eof 2022-12-11 18:12:11 -08:00
failslab.c mm: fix unexpected changes to {failslab|fail_page_alloc}.attr 2022-11-22 18:50:44 -08:00
filemap.c filemap: convert replace_page_cache_page() to replace_page_cache_folio() 2022-12-11 18:12:12 -08:00
folio-compat.c folio-compat: remove lru_cache_add() 2022-12-11 18:12:13 -08:00
frontswap.c
gup.c New Feature: 2022-12-17 14:06:53 -06:00
gup_test.c mm/gup_test: free memory allocated via kvcalloc() using kvfree() 2022-12-15 16:37:48 -08:00
gup_test.h mm/gup_test: start/stop/read functionality for PIN LONGTERM test 2022-11-08 17:37:15 -08:00
highmem.c highmem: fix kmap_to_page() for kmap_local_page() addresses 2022-10-12 18:51:51 -07:00
hmm.c mm/hugetlb: make walk_hugetlb_range() safe to pmd unshare 2023-01-18 17:12:39 -08:00
huge_memory.c mm: huge_memory: convert split_huge_pages_all() to use a folio 2023-01-18 17:12:51 -08:00
hugetlb.c mm/uffd: detect pgtable allocation failures 2023-01-18 17:12:53 -08:00
hugetlb_cgroup.c mm/hugeltb_cgroup: convert hugetlb_cgroup_commit_charge*() to folios 2022-11-30 15:58:43 -08:00
hugetlb_vmemmap.c mm/hugetlb_vmemmap: remap head page to newly allocated page 2022-11-30 15:58:47 -08:00
hugetlb_vmemmap.h
hwpoison-inject.c mm/hwpoison: add __init/__exit annotations to module init/exit funcs 2022-10-03 14:03:05 -07:00
init-mm.c
internal.h mm: move folio_set_compound_order() to mm/internal.h 2023-01-18 17:12:36 -08:00
interval_tree.c
io-mapping.c
ioremap.c
Kconfig selftests/vm: rename selftests/vm to selftests/mm 2023-01-18 17:12:56 -08:00
Kconfig.debug tools/vm: rename tools/vm to tools/mm 2023-01-18 17:12:55 -08:00
khugepaged.c mm/MADV_COLLAPSE: don't expand collapse when vm_end is past requested end 2023-01-11 16:14:20 -08:00
kmemleak.c mm/kmemleak: use %pK to display kernel pointers in backtrace 2022-12-15 16:37:49 -08:00
ksm.c mm/ksm: convert break_ksm() to use walk_page_range_vma() 2022-12-11 18:12:09 -08:00
list_lru.c
maccess.c maccess: Fix writing offset in case of fault in strncpy_from_kernel_nofault() 2022-11-11 11:44:46 -08:00
madvise.c mm/swap: convert deactivate_page() to folio_deactivate() 2023-01-18 17:12:47 -08:00
Makefile mm: memcontrol: drop dead CONFIG_MEMCG_SWAP config symbol 2022-10-03 14:03:36 -07:00
mapping_dirty_helpers.c mm: Rename pmd_read_atomic() 2022-12-15 10:37:27 -08:00
memblock.c mm: Always release pages to the buddy allocator in memblock_free_late(). 2023-01-08 18:49:33 +02:00
memcontrol.c mm: memcg: add folio_memcg_check() 2023-01-18 17:12:52 -08:00
memfd.c mm/memfd: add write seals when apply SEAL_EXEC to executable memfd 2023-01-18 17:12:37 -08:00
memory-failure.c tools/vm: rename tools/vm to tools/mm 2023-01-18 17:12:55 -08:00
memory-tiers.c mm/demotion: fix NULL vs IS_ERR checking in memory_tier_init 2022-11-30 15:58:54 -08:00
memory.c mm: add vma_has_recency() 2023-01-18 17:12:57 -08:00
memory_hotplug.c mm: add pageblock_aligned() macro 2022-10-03 14:03:04 -07:00
mempolicy.c mm/uffd: detect pgtable allocation failures 2023-01-18 17:12:53 -08:00
mempool.c mempool: do not use ksize() for poisoning 2022-11-30 15:58:41 -08:00
memremap.c mm/memremap.c: map FS_DAX device memory as decrypted 2022-11-08 15:57:23 -08:00
memtest.c
migrate.c mm/hugetlb: move swap entry handling into vma lock when faulted 2023-01-18 17:12:38 -08:00
migrate_device.c mm/migrate_device: return number of migrating pages in args->cpages 2022-11-22 18:50:43 -08:00
mincore.c mm: convert find_get_incore_page() to filemap_get_incore_folio() 2022-11-08 17:37:18 -08:00
mlock.c
mm_init.c memory: move hotplug memory notifier priority to same file for easy sorting 2022-11-08 17:37:17 -08:00
mm_slot.h mm: introduce common struct mm_slot 2022-10-03 14:02:43 -07:00
mmap.c mm: update mmap_sem comments to refer to mmap_lock 2023-01-11 16:14:22 -08:00
mmap_lock.c
mmu_gather.c mm: mmu_gather: allow more than one batch of delayed rmaps 2022-12-11 18:12:21 -08:00
mmu_notifier.c
mmzone.c
mprotect.c mm/uffd: detect pgtable allocation failures 2023-01-18 17:12:53 -08:00
mremap.c mm, mremap: fix mremap() expanding vma with addr inside vma 2022-12-21 14:31:51 -08:00
msync.c
nommu.c mm/nommu: don't use VM_MAYSHARE for MAP_PRIVATE mappings 2023-01-18 17:12:57 -08:00
oom_kill.c
page-writeback.c mm: remove zap_page_range and create zap_vma_pages 2023-01-18 17:12:55 -08:00
page_alloc.c mm/page_alloc: invert logic for early page initialisation checks 2023-01-18 17:12:54 -08:00
page_counter.c
page_ext.c Merge branch 'mm-hotfixes-stable' into mm-stable 2022-11-30 14:58:42 -08:00
page_idle.c mm: page_idle: convert page idle to use a folio 2023-01-18 17:12:52 -08:00
page_io.c page_io: remove buffer_head include 2023-01-18 17:12:40 -08:00
page_isolation.c mm/page_isolation: fix clang deadcode warning 2022-10-28 13:37:22 -07:00
page_owner.c mm: reuse pageblock_start/end_pfn() macro 2022-10-03 14:03:03 -07:00
page_poison.c
page_reporting.c mm/page_reporting: replace rcu_access_pointer() with rcu_dereference_protected() 2023-01-18 17:12:50 -08:00
page_reporting.h
page_table_check.c mm: use kstrtobool() instead of strtobool() 2022-11-30 15:58:45 -08:00
page_vma_mapped.c mm/hugetlb: introduce hugetlb_walk() 2023-01-18 17:12:39 -08:00
pagewalk.c mm/hugetlb: introduce hugetlb_walk() 2023-01-18 17:12:39 -08:00
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c mm/percpu.c: remove the lcm code since block size is fixed at page size 2022-11-07 22:59:18 -08:00
pgalloc-track.h
pgtable-generic.c
process_vm_access.c use less confusing names for iov_iter direction initializers 2022-11-25 13:01:55 -05:00
ptdump.c
readahead.c
rmap.c mm: add vma_has_recency() 2023-01-18 17:12:57 -08:00
rodata_test.c mm/rodata_test: use PAGE_ALIGNED() helper 2022-10-03 14:03:05 -07:00
secretmem.c mm/secretmem: remove reduntant return value 2022-10-03 14:03:36 -07:00
shmem.c swap: avoid holding swap reference in swap_cache_get_folio 2023-01-18 17:12:45 -08:00
shrinker_debug.c
shuffle.c mm/shuffle: convert module_param_call to module_param_cb 2022-10-03 14:03:07 -07:00
shuffle.h
slab.c Merge branch 'slab/for-6.2/kmalloc_redzone' into slab/for-next 2022-11-21 10:36:09 +01:00
slab.h mm/slab: add is_kmalloc_cache() helper function 2023-01-18 17:12:54 -08:00
slab_common.c mm/kasan: simplify and refine kasan_cache code 2023-01-18 17:12:55 -08:00
slob.c Merge branch 'slab/for-6.1/kmalloc_size_roundup' into slab/for-next 2022-09-29 11:30:55 +02:00
slub.c MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
sparse-vmemmap.c mm/sparse-vmemmap: generalise vmemmap_populate_hugepages() 2022-12-11 18:12:12 -08:00
sparse.c mm/hwpoison: introduce per-memory_block hwpoison counter 2022-11-08 17:37:22 -08:00
swap.c mm/swap: convert deactivate_page() to folio_deactivate() 2023-01-18 17:12:47 -08:00
swap.h mm: convert find_get_incore_page() to filemap_get_incore_folio() 2022-11-08 17:37:18 -08:00
swap_cgroup.c mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled 2022-10-03 14:03:36 -07:00
swap_slots.c mm/swap: convert put_swap_page() to put_swap_folio() 2022-10-03 14:02:46 -07:00
swap_state.c swap: avoid holding swap reference in swap_cache_get_folio 2023-01-18 17:12:45 -08:00
swapfile.c swapfile: get rid of volatile and avoid redundant read 2023-01-18 17:12:44 -08:00
truncate.c folio-compat: remove lru_cache_add() 2022-12-11 18:12:13 -08:00
usercopy.c mm: use kstrtobool() instead of strtobool() 2022-11-30 15:58:45 -08:00
userfaultfd.c mm/uffd: detect pgtable allocation failures 2023-01-18 17:12:53 -08:00
util.c mm: new primitive kvmemdup() 2023-01-18 17:12:47 -08:00
vmalloc.c mm: vmalloc: replace BUG_ON() by WARN_ON_ONCE() 2023-01-18 17:12:48 -08:00
vmpressure.c
vmscan.c mm: add vma_has_recency() 2023-01-18 17:12:57 -08:00
vmstat.c mm: vmscan: split khugepaged stats from direct reclaim stats 2022-11-30 15:58:41 -08:00
workingset.c workingset: fix confusion around eviction vs refault container 2023-01-18 17:12:53 -08:00
z3fold.c zpool: clean out dead code 2022-12-11 18:12:10 -08:00
zbud.c zpool: clean out dead code 2022-12-11 18:12:10 -08:00
zpool.c zpool: clean out dead code 2022-12-11 18:12:10 -08:00
zsmalloc.c zsmalloc: implement writeback mechanism for zsmalloc 2022-12-11 18:12:10 -08:00
zswap.c zswap: fix writeback lock ordering for zsmalloc 2022-12-11 18:12:09 -08:00