kernel_optimize_test/mm
Johannes Weiner bd3f4b6fd9 mm: don't wake kswapd prematurely when watermark boosting is disabled
[ Upstream commit 597c892038e08098b17ccfe65afd9677e6979800 ]

On 2-node NUMA hosts we see bursts of kswapd reclaim and subsequent
pressure spikes and stalls from cache refaults while there is plenty of
free memory in the system.

Usually, kswapd is woken up when all eligible nodes in an allocation are
full.  But the code related to watermark boosting can wake kswapd on one
full node while the other one is mostly empty.  This may be justified to
fight fragmentation, but is currently unconditionally done whether
watermark boosting is occurring or not.

In our case, many of our workloads' throughput scales with available
memory, and pure utilization is a more tangible concern than trends
around longer-term fragmentation.  As a result we generally disable
watermark boosting.

Wake kswapd only woken when watermark boosting is requested.

Link: https://lkml.kernel.org/r/20201020175833.397286-1-hannes@cmpxchg.org
Fixes: 1c30844d2d ("mm: reclaim small amounts of memory when an external fragmentation event occurs")
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-12-30 11:53:55 +01:00
..
kasan kasan: fix object remaining in offline per-cpu quarantine 2020-12-11 14:02:14 -08:00
backing-dev.c
balloon_compaction.c
cleancache.c
cma_debug.c
cma.c
cma.h
compaction.c mm/compaction: stop isolation if too many pages are isolated and we have pages to migrate 2020-11-14 11:26:03 -08:00
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: avoid doing memory allocation with pgtable_t mapped. 2020-10-16 11:11:14 -07:00
debug.c mm, dump_page: rename head_mapcount() --> head_compound_mapcount() 2020-10-13 18:38:29 -07:00
dmapool.c mm/dmapool.c: replace hard coded function name with __func__ 2020-10-13 18:38:32 -07:00
early_ioremap.c
fadvise.c mm, fadvise: improve the expensive remote LRU cache draining after FADV_DONTNEED 2020-10-13 18:38:29 -07:00
failslab.c
filemap.c revert "mm/filemap: add static for function __add_to_page_cache_locked" 2020-12-11 14:02:14 -08:00
frame_vector.c
frontswap.c
gup_benchmark.c mm/gup_benchmark: take the mmap lock around GUP 2020-10-18 09:27:09 -07:00
gup.c mm/gup: combine put_compound_head() and unpin_user_page() 2020-12-30 11:53:54 +01:00
highmem.c mm/highmem.c: clean up endif comments 2020-10-16 11:11:18 -07:00
hmm.c
huge_memory.c mm/rmap: always do TTU_IGNORE_ACCESS 2020-12-30 11:53:55 +01:00
hugetlb_cgroup.c hugetlb_cgroup: fix offline of hugetlb cgroup with reservations 2020-12-06 10:19:07 -08:00
hugetlb.c hugetlb: fix an error code in hugetlb_reserve_pages() 2020-12-30 11:53:55 +01:00
hwpoison-inject.c mm,hwpoison-inject: don't pin for hwpoison_filter 2020-10-16 11:11:16 -07:00
init-mm.c mm/gup: prevent gup_fast from racing with COW during fork 2020-12-30 11:53:54 +01:00
internal.h mm: rename page_order() to buddy_order() 2020-10-16 11:11:19 -07:00
interval_tree.c
ioremap.c
Kconfig mm/zsmalloc.c: drop ZSMALLOC_PGTABLE_MAPPING 2020-12-06 10:19:07 -08:00
Kconfig.debug
khugepaged.c mm: remove the now-unnecessary mmget_still_valid() hack 2020-10-16 11:11:22 -07:00
kmemleak.c mm/kmemleak: rely on rcu for task stack scanning 2020-10-13 18:38:27 -07:00
ksm.c docs: get rid of :c:type explicit declarations for structs 2020-10-15 07:49:40 +02:00
list_lru.c mm: list_lru: set shrinker map bit when child nr_items is not zero 2020-12-06 10:19:07 -08:00
maccess.c
madvise.c mm,memory_failure: always pin the page in madvise_inject_error 2020-12-30 11:53:55 +01:00
Makefile mm,kmemleak-test.c: move kmemleak-test.c to samples dir 2020-10-13 18:38:27 -07:00
mapping_dirty_helpers.c
memblock.c memblock: get rid of a :c:type leftover 2020-10-15 07:49:46 +02:00
memcontrol.c mm: memcg/slab: fix use after free in obj_cgroup_charge 2020-12-30 11:53:54 +01:00
memfd.c
memory_hotplug.c mm/rmap: always do TTU_IGNORE_ACCESS 2020-12-30 11:53:55 +01:00
memory-failure.c mm,memory_failure: always pin the page in madvise_inject_error 2020-12-30 11:53:55 +01:00
memory.c mm/gup: prevent gup_fast from racing with COW during fork 2020-12-30 11:53:54 +01:00
mempolicy.c mm: mempolicy: fix potential pte_unmap_unlock pte error 2020-11-02 12:14:19 -08:00
mempool.c mm/mempool: add 'else' to split mutually exclusive case 2020-10-13 18:38:34 -07:00
memremap.c mm/mremap_pages: fix static key devmap_managed_key updates 2020-11-02 12:14:18 -08:00
memtest.c
migrate.c mm/rmap: always do TTU_IGNORE_ACCESS 2020-12-30 11:53:55 +01:00
mincore.c mm: factor find_get_incore_page out of mincore_page 2020-10-13 18:38:29 -07:00
mlock.c
mm_init.c
mmap.c mm/mmap.c: fix mmap return value when vma is merged after call_mmap() 2020-12-06 10:19:07 -08:00
mmu_gather.c
mmu_notifier.c mm/mmu_notifier: fix mmget() assert in __mmu_interval_notifier_insert 2020-10-16 11:11:17 -07:00
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c mm: remove alloc_vm_area 2020-10-18 09:27:10 -07:00
oom_kill.c mm, oom_adj: don't loop through tasks in __set_oom_adj when not necessary 2020-10-13 18:38:35 -07:00
page_alloc.c mm: don't wake kswapd prematurely when watermark boosting is disabled 2020-12-30 11:53:55 +01:00
page_counter.c mm/page_counter: correct the obsolete func name in the comment of page_counter_try_charge() 2020-10-13 18:38:30 -07:00
page_ext.c
page_idle.c
page_io.c mm/page_io.c: remove useless out label in __swap_writepage() 2020-10-13 18:38:30 -07:00
page_isolation.c mm: rename page_order() to buddy_order() 2020-10-16 11:11:19 -07:00
page_owner.c mm: rename page_order() to buddy_order() 2020-10-16 11:11:19 -07:00
page_poison.c mm/page_poison.c: replace bool variable with static key 2020-10-16 11:11:17 -07:00
page_reporting.c mm: rename page_order() to buddy_order() 2020-10-16 11:11:19 -07:00
page_reporting.h
page_vma_mapped.c
page-writeback.c mm: fix VM_BUG_ON(PageTail) and BUG_ON(PageWriteback) 2020-11-24 15:23:19 -08:00
pagewalk.c
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c percpu: convert flexible array initializers to use struct_size() 2020-10-30 23:02:28 +00:00
pgalloc-track.h
pgtable-generic.c
process_vm_access.c mm/process_vm_access: Add missing #include <linux/compat.h> 2020-10-27 12:41:29 -07:00
ptdump.c
readahead.c mm: use limited read-ahead to satisfy read 2020-10-17 13:49:08 -06:00
rmap.c mm/rmap: always do TTU_IGNORE_ACCESS 2020-12-30 11:53:55 +01:00
rodata_test.c
shmem.c fs: add a filesystem flag for THPs 2020-10-16 11:11:15 -07:00
shuffle.c mm: rename page_order() to buddy_order() 2020-10-16 11:11:19 -07:00
shuffle.h
slab_common.c
slab.c mm: fix some comments formatting 2020-10-16 11:11:19 -07:00
slab.h mm: memcg/slab: fix obj_cgroup_charge() return value handling 2020-12-06 10:19:07 -08:00
slob.c
slub.c mm/slub: fix panic in slab_alloc_node() 2020-11-14 11:26:03 -08:00
sparse-vmemmap.c
sparse.c mm/memory_hotplug: guard more declarations by CONFIG_MEMORY_HOTPLUG 2020-10-16 11:11:18 -07:00
swap_cgroup.c
swap_slots.c mm/swap_slots.c: remove always zero and unused return value of enable_swap_slots_cache() 2020-10-13 18:38:30 -07:00
swap_state.c mm: fix some broken comments 2020-10-16 11:11:19 -07:00
swap.c mm: move call to compound_head() in release_pages() 2020-10-13 18:38:33 -07:00
swapfile.c mm/swapfile: do not sleep with a spin lock held 2020-12-06 10:19:07 -08:00
truncate.c mm/truncate.c: make __invalidate_mapping_pages() static 2020-11-02 12:14:19 -08:00
usercopy.c
userfaultfd.c
util.c mm/util.c: update the kerneldoc for kstrdup_const() 2020-10-16 11:11:17 -07:00
vmacache.c
vmalloc.c mm/vmalloc.c: fix kasan shadow poisoning size 2020-12-30 11:53:55 +01:00
vmpressure.c
vmscan.c mm/rmap: always do TTU_IGNORE_ACCESS 2020-12-30 11:53:55 +01:00
vmstat.c mm/vmstat.c: use helper macro abs() 2020-10-16 11:11:17 -07:00
workingset.c XArray updates for 5.9 2020-10-20 14:39:37 -07:00
z3fold.c mm/z3fold.c: use xx_zalloc instead xx_alloc and memset 2020-10-13 18:38:34 -07:00
zbud.c mm/zbud: remove redundant initialization 2020-10-13 18:38:34 -07:00
zpool.c
zsmalloc.c mm/zsmalloc.c: drop ZSMALLOC_PGTABLE_MAPPING 2020-12-06 10:19:07 -08:00
zswap.c