linux/mm
Charan Teja Kalla 9cd20f3fe0 mm: page_alloc: enforce minimum zone size to do high atomic reserves
Highatomic reserves are set to roughly 1% of zone for maximum and a
pageblock size for minimum.  Encountered a system with the below
configuration:
Normal free:7728kB boost:0kB min:804kB low:1004kB high:1204kB
reserved_highatomic:8192KB managed:49224kB

On such systems, even a single pageblock makes highatomic reserves are set
to ~8% of the zone memory.  This high value can easily exert pressure on
the zone.

Per discussion with Michal and Mel, it is not much useful to reserve the
memory for highatomic allocations on such small systems[1].  Since the
minimum size for high atomic reserves is always going to be a pageblock
size and if 1% of zone managed pages is going to be below pageblock size,
don't reserve memory for high atomic allocations.  Thanks Michal for this
suggestion[2].

Since no memory is being reserved for high atomic allocations and if
respective allocation failures are seen, this patch can be reverted.

[1] https://lore.kernel.org/linux-mm/20231117161956.d3yjdxhhm4rhl7h2@techsingularity.net/
[2] https://lore.kernel.org/linux-mm/ZVYRJMUitykepLRy@tiehlicka/

Link: https://lkml.kernel.org/r/c3a2a48e2cfe08176a80eaf01c110deb9e918055.1700821416.git.quic_charante@quicinc.com
Signed-off-by: Charan Teja Kalla <quic_charante@quicinc.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-12-10 16:51:52 -08:00
..
damon mm/damon/core-test: test damon_split_region_at()'s access rate copying 2023-12-10 16:51:50 -08:00
kasan kasan: improve free meta storage in Generic KASAN 2023-12-10 16:51:50 -08:00
kfence LoongArch changes for v6.6 2023-09-08 12:16:52 -07:00
kmsan kmsan: use stack_depot_save instead of __stack_depot_save 2023-12-10 16:51:46 -08:00
backing-dev.c writeback: remove redundant checks for root memcg 2023-08-21 13:37:48 -07:00
balloon_compaction.c
bootmem_info.c bootmem: use kmemleak_free_part_phys in put_page_bootmem 2023-10-25 16:47:13 -07:00
cma_debug.c
cma_sysfs.c mm: cma: make kobj_type structure constant 2023-03-28 16:20:06 -07:00
cma.c mm/cma: use nth_page() in place of direct struct page manipulation 2023-10-04 10:32:29 -07:00
cma.h
compaction.c mm/compaction: factor out code to test if we should run compaction for target order 2023-10-04 10:32:19 -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: fix multiple typos in multiple files 2023-10-25 16:47:14 -07:00
debug.c mm: update validate_mm() to use vma iterator 2023-06-09 16:25:31 -07:00
dmapool_test.c dmapool: add alloc/free performance test 2023-04-05 19:42:38 -07:00
dmapool.c dmapool: create/destroy cleanup 2023-06-09 16:25:17 -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
filemap.c mm/filemap: increase usage of folio_next_index() helper 2023-12-10 16:51:35 -08:00
folio-compat.c mm: return void from folio_start_writeback() and related functions 2023-12-10 16:51:37 -08:00
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
gup.c mm/gup: make failure to pin an error if FOLL_NOWAIT not specified 2023-10-18 14:34:15 -07:00
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: huge_memory: batch tlb flush when splitting a pte-mapped THP 2023-12-10 16:51:34 -08:00
hugetlb_cgroup.c mm, hugetlb: remove HUGETLB_CGROUP_MIN_ORDER 2023-10-18 14:34:17 -07:00
hugetlb_vmemmap.c hugetlb_vmemmap: use folio argument for hugetlb_vmemmap_* functions 2023-10-25 16:47:08 -07:00
hugetlb_vmemmap.h mm: hugetlb_vmemmap: fix reference to nonexistent file 2023-10-25 16:47:14 -07:00
hugetlb.c hugetlb: fix null-ptr-deref in hugetlb_vma_lock_write 2023-12-06 16:12:43 -08:00
hwpoison-inject.c
init-mm.c mm: move dummy_vm_ops out of a header 2023-08-21 13:37:46 -07:00
internal.h mm: remove invalidate_inode_page() 2023-12-10 16:51:39 -08:00
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 mm/Kconfig: make userfaultfd a menuconfig 2023-12-06 16:12:47 -08:00
Kconfig.debug mm: page_table_check: Make it dependent on EXCLUSIVE_SYSTEM_RAM 2023-05-29 16:14:28 +01:00
khugepaged.c As usual, lots of singleton and doubleton patches all over the tree and 2023-11-02 20:53:31 -10:00
kmemleak.c kmemleak: add checksum to backtrace report 2023-12-10 16:51:43 -08:00
ksm.c mm/ksm: use kmap_local_page() in calc_checksum() 2023-12-10 16:51:49 -08:00
list_lru.c
maccess.c mm: Fix copy_from_user_nofault(). 2023-04-12 17:36:23 -07:00
madvise.c mm/madvise: add cond_resched() in madvise_cold_or_pageout_pte_range() 2023-12-06 16:12:50 -08:00
Makefile mm: vmscan: move shrinker-related code into a separate file 2023-10-04 10:32:23 -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 NUMA: optimize detection of memory with no node id assigned by firmware 2023-12-10 16:51:34 -08:00
memcontrol.c mm: kmem: properly initialize local objcg variable in current_obj_cgroup() 2023-12-06 16:12:44 -08:00
memfd.c memfd: drop warning for missing exec-related flags 2023-10-04 10:32:22 -07:00
memory_hotplug.c mm/memory_hotplug: split memmap_on_memory requests across memblocks 2023-12-10 16:51:34 -08:00
memory-failure.c fs: convert error_remove_page to error_remove_folio 2023-12-10 16:51:42 -08:00
memory-tiers.c dax, kmem: calculate abstract distance with general interface 2023-10-16 15:44:39 -07:00
memory.c mm/memory: use kmap_local_page() in __wp_page_copy_user() 2023-12-10 16:51:49 -08:00
mempolicy.c Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
mempool.c mm/mempool: replace kmap_atomic() with kmap_local_page() 2023-12-10 16:51:49 -08:00
memremap.c mm: use vmem_altmap code without CONFIG_ZONE_DEVICE 2023-12-10 16:51:48 -08:00
memtest.c mm: memtest: convert to memtest_report_meminfo() 2023-08-21 13:37:47 -07:00
migrate_device.c Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
migrate.c mm: migrate: record the mlocked page status to remove unnecessary lru drain 2023-10-25 16:47:14 -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 mm: mlock: avoid folio_within_range() on KSM pages 2023-10-25 16:47:14 -07:00
mm_init.c mm/mm_init.c: append newline to the unavailable ranges log-message 2023-12-10 16:51:51 -08:00
mm_slot.h
mmap_lock.c
mmap.c mmap: remove the IA64-specific vma expansion implementation 2023-12-10 16:51:39 -08:00
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: remove page_cpupid_xchg_last() 2023-10-25 16:47:13 -07:00
mprotect.c mm: mprotect: use a folio in change_pte_range() 2023-10-25 16:47:12 -07:00
mremap.c mm: abstract VMA merge and extend into vma_merge_extend() helper 2023-10-18 14:34:18 -07:00
msync.c
nommu.c Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
oom_kill.c mm/oom_killer: simplify OOM killer info dump helper 2023-10-25 16:47:10 -07:00
page_alloc.c mm: page_alloc: enforce minimum zone size to do high atomic reserves 2023-12-10 16:51:52 -08:00
page_counter.c
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
page_io.c mm: memcg: add THP swap out info for anonymous reclaim 2023-10-04 10:32:27 -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_owner: record and dump free_pid and free_tgid 2023-12-10 16:51:40 -08:00
page_poison.c mm/page_poison: replace kmap_atomic() with kmap_local_page() 2023-12-10 16:51:50 -08:00
page_reporting.c mm, treewide: redefine MAX_ORDER sanely 2023-04-05 19:42:46 -07:00
page_reporting.h
page_table_check.c mm: convert page_table_check_pte_set() to page_table_check_ptes_set() 2023-08-24 16:20:18 -07:00
page_vma_mapped.c mm: correct stale comment of function check_pte 2023-08-18 10:12:13 -07:00
page-writeback.c mm: return void from folio_start_writeback() and related functions 2023-12-10 16:51:37 -08:00
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 Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
pgalloc-track.h
pgtable-generic.c mm/pgtable: notes on pte_offset_map[_lock]() 2023-08-18 10:12:25 -07:00
process_vm_access.c mm: fix process_vm_rw page counts 2023-12-10 16:51:39 -08:00
ptdump.c mm: ptdump should use ptep_get_lockless() 2023-06-19 16:19:24 -07:00
readahead.c vfs: fix readahead(2) on block devices 2023-10-19 11:02:49 +02:00
rmap.c mm/rmap: convert page_move_anon_rmap() to folio_move_anon_rmap() 2023-10-18 14:34:14 -07:00
rodata_test.c
secretmem.c mm/secretmem: use a folio in secretmem_fault() 2023-08-21 13:38:02 -07:00
shmem_quota.c shmem: Add default quota limit mount options 2023-08-09 09:15:40 +02:00
shmem.c fs: convert error_remove_page to error_remove_folio 2023-12-10 16:51:42 -08:00
show_mem.c mm: refactor si_mem_available() 2023-10-04 10:32:19 -07:00
shrinker_debug.c mm: shrinker: convert shrinker_rwsem to mutex 2023-10-04 10:32:26 -07:00
shrinker.c mm: shrinker: convert shrinker_rwsem to mutex 2023-10-04 10:32:26 -07:00
shuffle.c
shuffle.h mm, treewide: redefine MAX_ORDER sanely 2023-04-05 19:42:46 -07:00
slab_common.c RCU pull request for v6.7 2023-10-30 18:01:41 -10:00
slab.c Randomized slab caches for kmalloc() 2023-07-18 10:07:47 +02:00
slab.h mm: kmem: scoped objcg protection 2023-10-25 16:47:11 -07:00
slub.c slub, kasan: improve interaction of KASAN and slub_debug poisoning 2023-12-10 16:51:48 -08:00
sparse-vmemmap.c mm/vmemmap: allow architectures to override how vmemmap optimization works 2023-08-18 10:12:53 -07:00
sparse.c mm/sparse: remove redundant judgments from macro for_each_present_section_nr 2023-08-18 10:12:14 -07:00
swap_cgroup.c
swap_slots.c
swap_state.c mempolicy: alloc_pages_mpol() for NUMA policy without vma 2023-10-25 16:47:16 -07:00
swap.c mm: remove references to pagevec 2023-06-23 16:59:30 -07:00
swap.h mempolicy: alloc_pages_mpol() for NUMA policy without vma 2023-10-25 16:47:16 -07:00
swapfile.c mm/swap: Convert to use bdev_open_by_dev() 2023-10-28 13:29:19 +02:00
truncate.c fs: convert error_remove_page to error_remove_folio 2023-12-10 16:51:42 -08:00
usercopy.c mm: Fix copy_from_user_nofault(). 2023-04-12 17:36:23 -07:00
userfaultfd.c mm: more ptep_get() conversion 2023-11-15 15:30:09 -08:00
util.c mm/util: use kmap_local_page() in memcmp_pages() 2023-12-10 16:51:49 -08:00
vmalloc.c mm/vmalloc: fix the unchecked dereference warning in vread_iter() 2023-11-01 12:38:35 -07:00
vmpressure.c net-memcg: Fix scope of sockmem pressure indicators 2023-08-16 12:21:32 +01:00
vmscan.c mm/vmstat: move pgdemote_* to per-node stats 2023-12-10 16:51:31 -08:00
vmstat.c mm/vmstat: move pgdemote_* to per-node stats 2023-12-10 16:51:31 -08:00
workingset.c mm: workingset: dynamically allocate the mm-shadow shrinker 2023-10-04 10:32:24 -07:00
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 zsmalloc: use copy_page for full page copy 2023-10-18 14:34:16 -07:00
zswap.c zswap: export compression failure stats 2023-11-01 12:38:35 -07:00