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Johannes Weiner b32c5e0ae6 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 11:51:27 +01:00
..
kasan kasan: disable branch tracing for core runtime 2020-05-27 17:46:48 +02:00
Kconfig mm/zsmalloc.c: drop ZSMALLOC_PGTABLE_MAPPING 2020-12-16 10:56:59 +01:00
Kconfig.debug
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Makefile
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backing-dev.c bdi: add a ->dev_name field to struct backing_dev_info 2020-05-14 07:58:30 +02:00
balloon_compaction.c
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cleancache.c
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cma.c cma: don't quit at first error when activating reserved areas 2020-09-03 11:26:51 +02:00
cma.h
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cma_debug.c
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compaction.c mm, compaction: make capture control handling safe wrt interrupts 2020-07-09 09:37:57 +02:00
debug.c mm/debug.c: always print flags in dump_page() 2020-03-05 16:43:51 +01:00
debug_page_ref.c
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dmapool.c
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early_ioremap.c
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fadvise.c
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failslab.c
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filemap.c mm/error_inject: Fix allow_error_inject function signatures. 2020-10-29 09:57:37 +01:00
frame_vector.c
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frontswap.c
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gup.c mm/gup: fix gup_fast with dynamic page table folding 2020-10-01 13:18:24 +02:00
gup_benchmark.c mm/gup: fix memory leak in __gup_benchmark_ioctl 2020-01-09 10:20:00 +01:00
highmem.c
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hmm.c
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huge_memory.c mm/userfaultfd: do not access vma->vm_mm after calling handle_userfault() 2020-11-24 13:29:24 +01:00
hugetlb.c mm/hugetlb: fix a race between hugetlb sysctl handlers 2020-09-09 19:12:37 +02:00
hugetlb_cgroup.c mm: hugetlb: switch to css_tryget() in hugetlb_cgroup_charge_cgroup() 2019-11-15 18:34:00 -08:00
hwpoison-inject.c
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init-mm.c mm/init-mm.c: include <linux/mman.h> for vm_committed_as_batch 2019-10-19 06:32:32 -04:00
internal.h mm: drop mmap_sem before calling balance_dirty_pages() in write fault 2020-01-09 10:19:55 +01:00
interval_tree.c
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khugepaged.c mm: khugepaged: recalculate min_free_kbytes after memory hotplug as expected by khugepaged 2020-10-14 10:33:05 +02:00
kmemleak-test.c
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kmemleak.c mm/kmemleak.c: use address-of operator on section symbols 2020-10-01 13:17:53 +02:00
ksm.c mm/ksm: fix NULL pointer dereference when KSM zero page is enabled 2020-04-29 16:33:15 +02:00
list_lru.c mm: list_lru: set shrinker map bit when child nr_items is not zero 2020-12-11 13:23:31 +01:00
maccess.c uaccess: Add non-pagefault user-space write function 2020-01-17 19:48:40 +01:00
madvise.c mm: validate pmd after splitting 2020-10-01 13:18:21 +02:00
memblock.c mm: memblock: do not enforce current limit for memblock_phys* family 2019-10-19 06:32:32 -04:00
memcontrol.c mm: memcg/slab: fix root memcg vmstats 2020-11-24 13:29:24 +01:00
memfd.c
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memory-failure.c mm/memory-failure.c: don't access uninitialized memmaps in memory_failure() 2019-10-19 06:32:31 -04:00
memory.c mm: avoid data corruption on CoW fault into PFN-mapped VMA 2020-10-01 13:17:39 +02:00
memory_hotplug.c mm: don't rely on system state to detect hot-plug operations 2020-10-07 08:01:30 +02:00
mempolicy.c mm: mempolicy: fix potential pte_unmap_unlock pte error 2020-11-10 12:37:27 +01:00
mempool.c
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memremap.c mm/memory_hotplug: shrink zones when offlining memory 2020-01-09 10:19:56 +01:00
memtest.c
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migrate.c mm: move_pages: report the number of non-attempted pages 2020-02-11 04:35:13 -08:00
mincore.c
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mlock.c
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mm_init.c
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mmap.c mm/mmap.c: initialize align_offset explicitly for vm_unmapped_area 2020-10-01 13:17:54 +02:00
mmu_context.c mm: fix kthread_use_mm() vs TLB invalidate 2020-09-03 11:26:51 +02:00
mmu_gather.c mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush 2020-02-11 04:35:42 -08:00
mmu_notifier.c mm/mmu_notifiers: use the right return code for WARN_ON 2019-11-06 08:47:50 -08:00
mmzone.c
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mprotect.c mm, numa: fix bad pmd by atomically check for pmd_trans_huge when marking page tables prot_numa 2020-03-12 13:00:19 +01:00
mremap.c mm: Fix mremap not considering huge pmd devmap 2020-06-07 13:18:46 +02:00
msync.c
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nommu.c x86/mm: split vmalloc_sync_all() 2020-03-25 08:25:58 +01:00
oom_kill.c mm, oom_adj: don't loop through tasks in __set_oom_adj when not necessary 2020-10-29 09:57:45 +01:00
page-writeback.c mm/page-writeback.c: avoid potential division by zero in wb_min_max_ratio() 2020-01-23 08:22:41 +01:00
page_alloc.c mm: don't wake kswapd prematurely when watermark boosting is disabled 2020-12-30 11:51:27 +01:00
page_counter.c mm/page_counter.c: fix protection usage propagation 2020-08-21 13:05:27 +02:00
page_ext.c
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page_idle.c
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page_io.c mm/page_io.c: do not free shared swap slots 2019-11-15 18:34:00 -08:00
page_isolation.c mm/memory_hotplug: drain per-cpu pages again during memory offline 2020-09-23 12:40:47 +02:00
page_owner.c mm/page_owner: change split_page_owner to take a count 2020-10-29 09:57:52 +01:00
page_poison.c
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page_vma_mapped.c
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pagewalk.c mm: pagewalk: fix termination condition in walk_pte_range() 2020-10-01 13:17:30 +02:00
percpu-internal.h
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percpu-km.c
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percpu-stats.c
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percpu-vm.c
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percpu.c percpu: fix first chunk size calculation for populated bitmap 2020-09-23 12:40:45 +02:00
pgtable-generic.c
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process_vm_access.c
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readahead.c
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rmap.c mm: include <linux/huge_mm.h> for is_vma_temporary_stack 2019-10-19 06:32:32 -04:00
rodata_test.c
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shmem.c shmem: fix possible deadlocks on shmlock_user_lock 2020-05-20 08:20:03 +02:00
shuffle.c mm/shuffle: don't move pages between zones and don't read garbage memmaps 2020-09-03 11:26:51 +02:00
shuffle.h
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slab.c mm, debug_pagealloc: don't rely on static keys too early 2020-01-23 08:22:40 +01:00
slab.h mm: slab: make page_cgroup_ino() to recognize non-compound slab pages properly 2019-11-06 08:47:50 -08:00
slab_common.c mm: memcg/slab: fix memory leak at non-root kmem_cache destroy 2020-07-29 10:18:44 +02:00
slob.c
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slub.c mm/slub: fix panic in slab_alloc_node() 2020-11-18 19:20:30 +01:00
sparse-vmemmap.c
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sparse.c mm/sparse: fix kernel crash with pfn_section_valid check 2020-04-01 11:02:03 +02:00
swap.c
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swap_cgroup.c
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swap_slots.c
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swap_state.c mm/swap_state: fix a data race in swapin_nr_pages 2020-10-01 13:18:08 +02:00
swapfile.c mm/swapfile: do not sleep with a spin lock held 2020-12-11 13:23:31 +01:00
truncate.c mm/thp: allow dropping THP from page cache 2019-10-19 06:32:33 -04:00
usercopy.c
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userfaultfd.c
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util.c mm: add kvfree_sensitive() for freeing sensitive data objects 2020-06-17 16:40:23 +02:00
vmacache.c
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vmalloc.c mm/vunmap: add cond_resched() in vunmap_pmd_range 2020-09-03 11:26:52 +02:00
vmpressure.c
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vmscan.c mm/vmscan.c: fix data races using kswapd_classzone_idx 2020-10-01 13:17:53 +02:00
vmstat.c mm, vmstat: reduce zone->lock holding time by /proc/pagetypeinfo 2019-11-06 08:47:50 -08:00
workingset.c
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z3fold.c
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zbud.c
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zpool.c
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zsmalloc.c mm/zsmalloc.c: drop ZSMALLOC_PGTABLE_MAPPING 2020-12-16 10:56:59 +01:00
zswap.c
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