sst-linux/mm
SeongJae Park d7eda72e59 mm/damon/core: merge regions aggressively when max_nr_regions is unmet
commit 310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6 upstream.

DAMON keeps the number of regions under max_nr_regions by skipping regions
split operations when doing so can make the number higher than the limit.
It works well for preventing violation of the limit.  But, if somehow the
violation happens, it cannot recovery well depending on the situation.  In
detail, if the real number of regions having different access pattern is
higher than the limit, the mechanism cannot reduce the number below the
limit.  In such a case, the system could suffer from high monitoring
overhead of DAMON.

The violation can actually happen.  For an example, the user could reduce
max_nr_regions while DAMON is running, to be lower than the current number
of regions.  Fix the problem by repeating the merge operations with
increasing aggressiveness in kdamond_merge_regions() for the case, until
the limit is met.

[sj@kernel.org: increase regions merge aggressiveness while respecting min_nr_regions]
  Link: https://lkml.kernel.org/r/20240626164753.46270-1-sj@kernel.org
[sj@kernel.org: ensure max threshold attempt for max_nr_regions violation]
  Link: https://lkml.kernel.org/r/20240627163153.75969-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20240624175814.89611-1-sj@kernel.org
Fixes: b9a6ac4e4e ("mm/damon: adaptively adjust regions")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>	[5.15+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 310d6c15e9104c99d5d9d0ff8e5383a79da7d5e6)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-07-25 09:49:07 +02:00
..
damon mm/damon/core: merge regions aggressively when max_nr_regions is unmet 2024-07-25 09:49:07 +02:00
kasan kasan/test: avoid gcc warning for intentional overflow 2024-04-03 15:19:27 +02:00
kfence mm,kfence: decouple kfence from page granularity mapping judgement 2023-12-03 07:32:08 +01:00
kmsan kmsan: do not wipe out origin when doing partial unpoisoning 2024-06-16 13:41:38 +02:00
backing-dev.c writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs 2023-04-26 14:28:39 +02:00
balloon_compaction.c
bootmem_info.c
cma_debug.c
cma_sysfs.c
cma.c mm/cma: drop incorrect alignment check in cma_init_reserved_mem 2024-06-16 13:41:39 +02:00
cma.h
compaction.c mm, vmscan: prevent infinite loop for costly GFP_NOIO | __GFP_RETRY_MAYFAIL allocations 2024-04-03 15:19:42 +02:00
debug_page_ref.c
debug_vm_pgtable.c
debug.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c mm: merge folio_has_private()/filemap_release_folio() call pairs 2024-01-10 17:10:31 +01:00
folio-compat.c
frontswap.c
gup_test.c
gup_test.h
gup.c mm: always expand the stack with the mmap write lock held 2023-07-01 13:16:25 +02:00
highmem.c
hmm.c
huge_memory.c mm: fix race between __split_huge_pmd_locked() and GUP-fast 2024-06-16 13:41:38 +02:00
hugetlb_cgroup.c mm/hugetlb_cgroup: convert hugetlb_cgroup_uncharge_page() to folios 2024-05-17 11:55:52 +02:00
hugetlb_vmemmap.c mm: hugetlb_vmemmap: fix a race between vmemmap pmd split 2023-09-19 12:27:56 +02:00
hugetlb_vmemmap.h
hugetlb.c mm/hugetlb: pass correct order_per_bit to cma_declare_contiguous_nid 2024-06-16 13:41:39 +02:00
hwpoison-inject.c
init-mm.c
internal.h mm, netfs, fscache: stop read optimisation when folio removed from pagecache 2024-01-10 17:10:31 +01:00
interval_tree.c
io-mapping.c
ioremap.c
Kconfig mm: introduce new 'lock_mm_and_find_vma()' page fault helper 2023-07-01 13:16:24 +02:00
Kconfig.debug mm: page_table_check: Make it dependent on EXCLUSIVE_SYSTEM_RAM 2023-06-14 11:15:29 +02:00
khugepaged.c mm: merge folio_has_private()/filemap_release_folio() call pairs 2024-01-10 17:10:31 +01:00
kmemleak.c
ksm.c mm/ksm: fix race with VMA iteration and mm_struct teardown 2023-03-30 12:49:29 +02:00
list_lru.c
maccess.c mm: Fix copy_from_user_nofault(). 2023-06-28 11:12:17 +02:00
madvise.c madvise:madvise_free_pte_range(): don't use mapcount() against large folio for sharing check 2023-08-30 16:11:11 +02:00
Makefile
mapping_dirty_helpers.c
memblock.c x86/numa: Fix the address overlap check in numa_fill_memblks() 2024-03-01 13:26:36 +01:00
memcontrol.c mm: memcontrol: clarify swapaccount=0 deprecation warning 2024-03-01 13:26:32 +01:00
memfd.c memfd: check for non-NULL file_seals in memfd_create() syscall 2023-06-28 11:12:27 +02:00
memory_hotplug.c mm/memory_hotplug: fix error handling in add_memory_resource() 2024-01-10 17:10:33 +01:00
memory-failure.c mm/memory-failure: fix handling of dissolved but not taken off from buddy pages 2024-06-21 14:35:59 +02:00
memory-tiers.c
memory.c x86/mm/pat: fix VM_PAT handling in COW mappings 2024-04-10 16:28:33 +02:00
mempolicy.c mm/mempolicy: fix set_mempolicy_home_node() previous VMA pointer 2023-11-08 14:11:02 +01:00
mempool.c
memremap.c
memtest.c memtest: use {READ,WRITE}_ONCE in memory scanning 2024-04-03 15:19:36 +02:00
migrate_device.c
migrate.c mm/hugetlb: add folio_hstate() 2024-05-17 11:55:52 +02:00
mincore.c
mlock.c
mm_init.c
mm_slot.h
mmap_lock.c
mmap.c mmap: fix error paths with dup_anon_vma() 2023-11-08 14:11:03 +01:00
mmu_gather.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c xtensa: fix lock_mm_and_find_vma in case VMA not found 2023-07-05 18:27:37 +01:00
oom_kill.c
page_alloc.c mm/page_alloc: Separate THP PCP into movable and non-movable categories 2024-07-05 09:32:00 +02:00
page_counter.c
page_ext.c
page_idle.c
page_io.c
page_isolation.c
page_owner.c
page_poison.c
page_reporting.c
page_reporting.h
page_table_check.c mm/page_table_check: fix crash on ZONE_DEVICE 2024-06-27 13:46:22 +02:00
page_vma_mapped.c
page-writeback.c Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" 2024-07-11 12:47:14 +02:00
pagewalk.c
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c
pgalloc-track.h
pgtable-generic.c mm: fix race between __split_huge_pmd_locked() and GUP-fast 2024-06-16 13:41:38 +02:00
process_vm_access.c
ptdump.c
readahead.c mm: use memalloc_nofs_save() in page_cache_ra_order() 2024-05-17 11:56:21 +02:00
rmap.c
rodata_test.c
secretmem.c
shmem.c mm/shmem: fix race in shmem_undo_range w/THP 2023-12-20 17:00:26 +01:00
shrinker_debug.c
shuffle.c
shuffle.h
slab_common.c mm/slab_common: fix slab_caches list corruption after kmem_cache_destroy() 2023-10-06 14:57:03 +02:00
slab.c mm/slab: Fix undefined init_cache_node_node() for NUMA and !SMP 2023-03-30 12:49:23 +02:00
slab.h
slob.c
slub.c
sparse-vmemmap.c
sparse.c mm/sparsemem: fix race in accessing memory_section->usage 2024-01-31 16:17:02 -08:00
swap_cgroup.c
swap_slots.c
swap_state.c
swap.c
swap.h mm/swap: fix race when skipping swapcache 2024-03-01 13:26:32 +01:00
swapfile.c mm: swap: fix race between free_swap_and_cache() and swapoff() 2024-04-03 15:19:32 +02:00
truncate.c mm: merge folio_has_private()/filemap_release_folio() call pairs 2024-01-10 17:10:31 +01:00
usercopy.c mm: Fix copy_from_user_nofault(). 2023-06-28 11:12:17 +02:00
userfaultfd.c userfaultfd: fix mmap_changing checking in mfill_atomic_hugetlb 2024-02-23 09:12:51 +01:00
util.c rcu: dump vmalloc memory info safely 2023-09-13 09:42:59 +02:00
vmalloc.c mm/vmalloc: fix vmalloc which may return null if called with __GFP_NOFAIL 2024-06-21 14:35:41 +02:00
vmpressure.c net-memcg: Fix scope of sockmem pressure indicators 2023-09-13 09:42:33 +02:00
vmscan.c mm, vmscan: prevent infinite loop for costly GFP_NOIO | __GFP_RETRY_MAYFAIL allocations 2024-04-03 15:19:42 +02:00
vmstat.c
workingset.c mm/mglru: fix underprotected page cache 2023-12-20 17:00:26 +01:00
z3fold.c
zbud.c
zpool.c
zsmalloc.c zsmalloc: allow only one active pool compaction context 2023-08-23 17:52:40 +02:00
zswap.c mm: zswap: fix missing folio cleanup in writeback race path 2024-03-01 13:26:39 +01:00