SeongJae Park 11078e2d11 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-07-18 13:21:24 +02:00
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damon	mm/damon/core: merge regions aggressively when max_nr_regions is unmet	2024-07-18 13:21:24 +02:00
kasan	kasan/test: avoid gcc warning for intentional overflow	2024-04-03 15:28:20 +02:00
kfence	LoongArch changes for v6.6	2023-09-08 12:16:52 -07:00
kmsan	kmsan: do not wipe out origin when doing partial unpoisoning	2024-06-16 13:47:41 +02:00
backing-dev.c	blk-wbt: Fix detection of dirty-throttled tasks	2024-02-23 09:25:16 +01:00
balloon_compaction.c	mm: Convert all PageMovable users to movable_operations	2022-08-02 12:34:03 -04:00
bootmem_info.c	bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem	2022-08-28 14:02:45 -07:00
cma.c	mm/cma: drop incorrect alignment check in cma_init_reserved_mem	2024-06-16 13:47:42 +02:00
cma.h
cma_debug.c	mm/cma_debug: show complete cma name in debugfs directories	2022-09-11 20:25:50 -07:00
cma_sysfs.c	mm: cma: make kobj_type structure constant	2023-03-28 16:20:06 -07:00
compaction.c	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
debug.c	mm: update validate_mm() to use vma iterator	2023-06-09 16:25:31 -07:00
debug_page_alloc.c	mm: page_alloc: split out DEBUG_PAGEALLOC	2023-06-09 16:25:23 -07:00
debug_page_ref.c
debug_vm_pgtable.c	mm/debug_vm_pgtable: fix BUG_ON with pud advanced test	2024-03-06 14:48:41 +00:00
dmapool.c	dmapool: create/destroy cleanup	2023-06-09 16:25:17 -07:00
dmapool_test.c	dmapool: add alloc/free performance test	2023-04-05 19:42:38 -07:00
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	mm: fix unexpected changes to {failslab|fail_page_alloc}.attr	2022-11-22 18:50:44 -08:00
filemap.c	mm/filemap: skip to create PMD-sized page cache if needed	2024-07-18 13:21:20 +02:00
folio-compat.c	filemap: Add fgf_t typedef	2023-07-24 18:04:30 -04:00
gup.c	mm/madvise: make MADV_POPULATE_(READ|WRITE) handle VM_FAULT_RETRY properly	2024-05-02 16:32:40 +02:00
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	mm/gup_test: start/stop/read functionality for PIN LONGTERM test	2022-11-08 17:37:15 -08:00
highmem.c	mm: ptep_get() conversion	2023-06-19 16:19:25 -07:00
hmm.c	mm: enable page walking API to lock vmas during the walk	2023-08-21 13:07:20 -07:00
huge_memory.c	mm: fix race between __split_huge_pmd_locked() and GUP-fast	2024-06-16 13:47:40 +02:00
hugetlb.c	mm/hugetlb: pass correct order_per_bit to cma_declare_contiguous_nid	2024-06-16 13:47:42 +02:00
hugetlb_cgroup.c	mm/hugetlb: increase use of folios in alloc_huge_page()	2023-02-13 15:54:27 -08:00
hugetlb_vmemmap.c	mm: hugetlb_vmemmap: fix a race between vmemmap pmd split	2023-08-18 10:12:14 -07:00
hugetlb_vmemmap.h	mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability	2022-08-08 18:06:43 -07:00
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	mm: move dummy_vm_ops out of a header	2023-08-21 13:37:46 -07:00
internal.h	mm/madvise: make MADV_POPULATE_(READ|WRITE) handle VM_FAULT_RETRY properly	2024-05-02 16:32:40 +02:00
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	- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")	2023-08-29 14:25:26 -07:00
Kconfig.debug	mm: page_table_check: Make it dependent on EXCLUSIVE_SYSTEM_RAM	2023-05-29 16:14:28 +01:00
khugepaged.c	- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")	2023-08-29 14:25:26 -07:00
kmemleak.c	mm/kmemleak: move up cond_resched() call in page scanning loop	2023-09-02 15:17:34 -07:00
ksm.c	mm/ksm: fix ksm_zero_pages accounting	2024-06-16 13:47:41 +02:00
list_lru.c	mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe	2022-06-16 19:48:31 -07:00
maccess.c	mm: Fix copy_from_user_nofault().	2023-04-12 17:36:23 -07:00
madvise.c	mm/madvise: make MADV_POPULATE_(READ|WRITE) handle VM_FAULT_RETRY properly	2024-05-02 16:32:40 +02:00
Makefile	- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")	2023-08-29 14:25:26 -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	x86/numa: Fix the address overlap check in numa_fill_memblks()	2024-03-01 13:35:06 +01:00
memcontrol.c	mm: memcontrol: clarify swapaccount=0 deprecation warning	2024-03-01 13:35:00 +01:00
memfd.c	revert "memfd: improve userspace warnings for missing exec-related flags".	2023-09-05 11:11:52 -07:00
memory-failure.c	mm/huge_memory: don't unpoison huge_zero_folio	2024-06-21 14:38:46 +02:00
memory-tiers.c	memory tier: use helper macro __ATTR_RW()	2023-08-18 10:12:38 -07:00
memory.c	x86/mm/pat: fix VM_PAT handling in COW mappings	2024-04-10 16:36:03 +02:00
memory_hotplug.c	mm/memory_hotplug: fix memmap_on_memory sysfs value retrieval	2024-01-20 11:51:49 +01:00
mempolicy.c	numa: Generalize numa_map_to_online_node()	2023-11-20 11:58:51 +01:00
mempool.c	mempool: do not use ksize() for poisoning	2022-11-30 15:58:41 -08:00
memremap.c	mm/memremap.c: fix outdated comment in devm_memremap_pages	2023-02-09 16:51:46 -08:00
memtest.c	memtest: use {READ,WRITE}_ONCE in memory scanning	2024-04-03 15:28:33 +02:00
migrate.c	mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index	2024-03-15 10:48:14 -04:00
migrate_device.c	Add x86 shadow stack support	2023-08-31 12:20:12 -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	merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes	2023-08-21 14:26:20 -07:00
mm_init.c	efi: disable mirror feature during crashkernel	2024-01-31 16:18:56 -08:00
mm_slot.h	mm: introduce common struct mm_slot	2022-10-03 14:02:43 -07:00
mmap.c	mm, mmap: fix vma_merge() case 7 with vma_ops->close	2024-04-03 15:28:40 +02:00
mmap_lock.c
mmu_gather.c	mm: fix kernel-doc warning from tlb_flush_rmaps()	2023-08-24 16:20:30 -07:00
mmu_notifier.c	mmu_notifiers: rename invalidate_range notifier	2023-08-18 10:12:41 -07:00
mmzone.c	mm: multi-gen LRU: groundwork	2022-09-26 19:46:09 -07:00
mprotect.c	Add x86 shadow stack support	2023-08-31 12:20:12 -07:00
mremap.c	vm: fix move_vma() memory accounting being off	2023-09-16 15:23:31 -07:00
msync.c	mm/msync: use vma_find() instead of vma linked list	2022-09-26 19:46:25 -07:00
nommu.c	Add x86 shadow stack support	2023-08-31 12:20:12 -07:00
oom_kill.c	mm: remove redundant K() macro definition	2023-08-21 13:37:44 -07:00
page-writeback.c	Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again"	2024-07-11 12:49:16 +02:00
page_alloc.c	mm/page_alloc: Separate THP PCP into movable and non-movable categories	2024-07-05 09:34:05 +02:00
page_counter.c	mm: page_counter: remove unneeded atomic ops for low/min	2022-09-11 20:26:01 -07:00
page_ext.c	mm/page_ext: move functions around for minor cleanups to page_ext	2023-08-18 10:12:31 -07:00
page_idle.c	mm: page_idle: convert page idle to use a folio	2023-01-18 17:12:52 -08:00
page_io.c	zswap: make zswap_load() take a folio	2023-08-21 13:37:27 -07:00
page_isolation.c	mm/hugetlb: get rid of page_hstate()	2023-08-18 10:12:39 -07:00
page_owner.c	mm/page_ext: use page_ext_data helper in page_owner	2023-08-21 13:37:27 -07:00
page_poison.c	mm/page_poison: remove unused page_ext.h from page_poison	2023-08-21 13:37:30 -07:00
page_reporting.c	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
page_reporting.h
page_table_check.c	mm/page_table_check: fix crash on ZONE_DEVICE	2024-06-27 13:49:13 +02:00
page_vma_mapped.c	mm: correct stale comment of function check_pte	2023-08-18 10:12:13 -07:00
pagewalk.c	mm/pagewalk: fix bootstopping regression from extra pte_unmap()	2023-09-02 08:39:21 -07:00
percpu-internal.h	percpu-internal/pcpu_chunk: re-layout pcpu_chunk structure to reduce false sharing	2023-06-19 16:19:29 -07:00
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c	mm: Introduce flush_cache_vmap_early()	2024-02-16 19:10:52 +01:00
pgalloc-track.h
pgtable-generic.c	mm: fix race between __split_huge_pmd_locked() and GUP-fast	2024-06-16 13:47:40 +02:00
process_vm_access.c	mm/gup: remove unused vmas parameter from pin_user_pages_remote()	2023-06-09 16:25:25 -07:00
ptdump.c	mm: ptdump should use ptep_get_lockless()	2023-06-19 16:19:24 -07:00
readahead.c	mm: use memalloc_nofs_save() in page_cache_ra_order()	2024-05-17 12:02:36 +02:00
rmap.c	mm: hugetlb: add huge page size param to set_huge_pte_at()	2023-09-29 17:20:47 -07:00
rodata_test.c	mm/rodata_test: use PAGE_ALIGNED() helper	2022-10-03 14:03:05 -07:00
secretmem.c	mm/secretmem: use a folio in secretmem_fault()	2023-08-21 13:38:02 -07:00
shmem.c	mm/shmem: disable PMD-sized page cache if needed	2024-07-18 13:21:24 +02:00
shmem_quota.c	tmpfs: fix race on handling dquot rbtree	2024-04-03 15:28:54 +02:00
show_mem.c	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
shrinker_debug.c	Revert "mm: shrinkers: make count and scan in shrinker debugfs lockless"	2023-06-19 13:19:34 -07:00
shuffle.c	mm/shuffle: convert module_param_call to module_param_cb	2022-10-03 14:03:07 -07:00
shuffle.h	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
slab.c	Randomized slab caches for kmalloc()	2023-07-18 10:07:47 +02:00
slab.h	Randomized slab caches for kmalloc()	2023-07-18 10:07:47 +02:00
slab_common.c	mm: slab: Do not create kmalloc caches smaller than arch_slab_minalign()	2023-10-11 15:24:49 +02:00
slub.c	mm/slub: remove freelist_dereference()	2023-07-14 09:57:21 +02:00
sparse-vmemmap.c	mm/vmemmap: allow architectures to override how vmemmap optimization works	2023-08-18 10:12:53 -07:00
sparse.c	mm/sparsemem: fix race in accessing memory_section->usage	2024-01-31 16:18:56 -08:00
swap.c	mm: remove references to pagevec	2023-06-23 16:59:30 -07:00
swap.h	mm/swap: fix race when skipping swapcache	2024-03-01 13:35:00 +01:00
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	mm/swap: inline folio_set_swap_entry() and folio_swap_entry()	2023-08-24 16:20:28 -07:00
swapfile.c	mm: swap: fix race between free_swap_and_cache() and swapoff()	2024-04-03 15:28:27 +02:00
truncate.c	- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")	2023-08-29 14:25:26 -07:00
usercopy.c	mm: Fix copy_from_user_nofault().	2023-04-12 17:36:23 -07:00
userfaultfd.c	mm/userfaultfd: Do not place zeropages when zeropages are disallowed	2024-06-12 11:11:33 +02:00
util.c	parisc: fix mmap_base calculation when stack grows upwards	2023-11-28 17:20:08 +00:00
vmalloc.c	mm: vmalloc: check if a hash-index is in cpu_possible_mask	2024-07-18 13:21:20 +02:00
vmpressure.c	net-memcg: Fix scope of sockmem pressure indicators	2023-08-16 12:21:32 +01:00
vmscan.c	mm, vmscan: prevent infinite loop for costly GFP_NOIO | __GFP_RETRY_MAYFAIL allocations	2024-04-03 15:28:44 +02:00
vmstat.c	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
workingset.c	mm: ratelimit stat flush from workingset shrinker	2024-06-16 13:47:31 +02:00
z3fold.c	mm/z3fold: remove obsolete comment for struct z3fold_pool	2023-08-21 13:37:51 -07:00
zbud.c	mm: zswap: remove shrink from zpool interface	2023-06-19 16:19:27 -07:00
zpool.c	mm: zswap: remove shrink from zpool interface	2023-06-19 16:19:27 -07:00
zsmalloc.c	merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes	2023-08-21 14:26:20 -07:00
zswap.c	mm: zswap: fix missing folio cleanup in writeback race path	2024-03-01 13:35:10 +01:00