Minchan Kim 91dcade47a mm: bail out in shrink_inactive_list() ... With node-lru, if there are enough reclaimable pages in highmem but nothing in lowmem, VM can try to shrink inactive list although the requested zone is lowmem. The problem is that if the inactive list is full of highmem pages then a direct reclaimer searching for a lowmem page waste CPU scanning uselessly. It just burns out CPU. Even, many direct reclaimers are stalled by too_many_isolated if lots of parallel reclaimer are going on although there are no reclaimable memory in inactive list. I tried the experiment 4 times in 32bit 2G 8 CPU KVM machine to get elapsed time. hackbench 500 process 2 = Old = 1st: 289s 2nd: 310s 3rd: 112s 4th: 272s = Now = 1st: 31s 2nd: 132s 3rd: 162s 4th: 50s. [akpm@linux-foundation.org: fixes per Mel] Link: http://lkml.kernel.org/r/1469433119-1543-1-git-send-email-minchan@kernel.org Signed-off-by: Minchan Kim <minchan@kernel.org> Acked-by: Mel Gorman <mgorman@techsingularity.net> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-07-28 16:07:41 -07:00
..
kasan	kasan/quarantine: fix bugs on qlist_move_cache()	2016-07-15 14:54:27 +09:00
Kconfig	thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE	2016-07-26 16:19:19 -07:00
Kconfig.debug	…
Makefile	thp: extract khugepaged from mm/huge_memory.c	2016-07-26 16:19:19 -07:00
backing-dev.c	mm, vmscan: move LRU lists to node	2016-07-28 16:07:41 -07:00
balloon_compaction.c	mm: balloon: use general non-lru movable page feature	2016-07-26 16:19:19 -07:00
bootmem.c	…
cleancache.c	…
cma.c	…
cma.h	…
cma_debug.c	…
compaction.c	mm: remove reclaim and compaction retry approximations	2016-07-28 16:07:41 -07:00
debug.c	…
debug_page_ref.c	…
dmapool.c	…
early_ioremap.c	…
fadvise.c	…
failslab.c	…
filemap.c	mm: move most file-based accounting to the node	2016-07-28 16:07:41 -07:00
frame_vector.c	…
frontswap.c	mm, frontswap: convert frontswap_enabled to static key	2016-07-26 16:19:19 -07:00
gup.c	thp: file pages support for split_huge_page()	2016-07-26 16:19:19 -07:00
highmem.c	…
huge_memory.c	mm: move most file-based accounting to the node	2016-07-28 16:07:41 -07:00
hugetlb.c	Merge branch 'akpm' (patches from Andrew)	2016-07-26 19:55:54 -07:00
hugetlb_cgroup.c	…
hwpoison-inject.c	…
init-mm.c	…
internal.h	mm, page_alloc: remove fair zone allocation policy	2016-07-28 16:07:41 -07:00
interval_tree.c	…
khugepaged.c	mm: convert zone_reclaim to node_reclaim	2016-07-28 16:07:41 -07:00
kmemcheck.c	…
kmemleak-test.c	…
kmemleak.c	…
ksm.c	mm: do not pass mm_struct into handle_mm_fault	2016-07-26 16:19:19 -07:00
list_lru.c	…
maccess.c	…
madvise.c	…
memblock.c	mm/memblock.c:memblock_add_range(): if nr_new is 0 just return	2016-07-26 16:19:19 -07:00
memcontrol.c	mm, vmscan: Update all zone LRU sizes before updating memcg	2016-07-28 16:07:41 -07:00
memory-failure.c	mm, vmscan: move LRU lists to node	2016-07-28 16:07:41 -07:00
memory.c	thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE	2016-07-26 16:19:19 -07:00
memory_hotplug.c	mm, vmscan: simplify the logic deciding whether kswapd sleeps	2016-07-28 16:07:41 -07:00
mempolicy.c	mm, vmscan: move LRU lists to node	2016-07-28 16:07:41 -07:00
mempool.c	…
memtest.c	…
migrate.c	mm: remove reclaim and compaction retry approximations	2016-07-28 16:07:41 -07:00
mincore.c	…
mlock.c	mm, vmscan: move LRU lists to node	2016-07-28 16:07:41 -07:00
mm_init.c	…
mmap.c	shmem: get_unmapped_area align huge page	2016-07-26 16:19:19 -07:00
mmu_context.c	…
mmu_notifier.c	…
mmzone.c	…
mprotect.c	mm: thp: check pmd_trans_unstable() after split_huge_pmd()	2016-07-26 16:19:19 -07:00
mremap.c	mm: thp: check pmd_trans_unstable() after split_huge_pmd()	2016-07-26 16:19:19 -07:00
msync.c	…
nobootmem.c	…
nommu.c	mm: introduce fault_env	2016-07-26 16:19:19 -07:00
oom_kill.c	mm, oom: tighten task_will_free_mem() locking	2016-07-28 16:07:41 -07:00
page-writeback.c	mm: remove reclaim and compaction retry approximations	2016-07-28 16:07:41 -07:00
page_alloc.c	mm: remove reclaim and compaction retry approximations	2016-07-28 16:07:41 -07:00
page_counter.c	…
page_ext.c	…
page_idle.c	mm, vmscan: move lru_lock to the node	2016-07-28 16:07:41 -07:00
page_io.c	…
page_isolation.c	mm/page_isolation: clean up confused code	2016-07-26 16:19:19 -07:00
page_owner.c	mm/page_owner: use stackdepot to store stacktrace	2016-07-26 16:19:19 -07:00
page_poison.c	…
pagewalk.c	…
percpu-km.c	…
percpu-vm.c	…
percpu.c	…
pgtable-generic.c	…
process_vm_access.c	…
quicklist.c	…
readahead.c	mm, memcg: use consistent gfp flags during readahead	2016-07-26 16:19:19 -07:00
rmap.c	mm: move most file-based accounting to the node	2016-07-28 16:07:41 -07:00
shmem.c	mm: move most file-based accounting to the node	2016-07-28 16:07:41 -07:00
slab.c	mm/slab: use list_move instead of list_del/list_add	2016-07-26 16:19:19 -07:00
slab.h	mm: memcontrol: cleanup kmem charge functions	2016-07-26 16:19:19 -07:00
slab_common.c	mm: charge/uncharge kmemcg from generic page allocator paths	2016-07-26 16:19:19 -07:00
slob.c	…
slub.c	mm: charge/uncharge kmemcg from generic page allocator paths	2016-07-26 16:19:19 -07:00
sparse-vmemmap.c	…
sparse.c	…
swap.c	mm, pagevec: release/reacquire lru_lock on pgdat change	2016-07-28 16:07:41 -07:00
swap_cgroup.c	…
swap_state.c	mm: move most file-based accounting to the node	2016-07-28 16:07:41 -07:00
swapfile.c	mm, frontswap: convert frontswap_enabled to static key	2016-07-26 16:19:19 -07:00
truncate.c	truncate: handle file thp	2016-07-26 16:19:19 -07:00
userfaultfd.c	…
util.c	mm: move most file-based accounting to the node	2016-07-28 16:07:41 -07:00
vmacache.c	…
vmalloc.c	mm: charge/uncharge kmemcg from generic page allocator paths	2016-07-26 16:19:19 -07:00
vmpressure.c	…
vmscan.c	mm: bail out in shrink_inactive_list()	2016-07-28 16:07:41 -07:00
vmstat.c	mm: remove reclaim and compaction retry approximations	2016-07-28 16:07:41 -07:00
workingset.c	mm, workingset: make working set detection node-aware	2016-07-28 16:07:41 -07:00
z3fold.c	…
zbud.c	…
zpool.c	…
zsmalloc.c	mm: fix build warnings in <linux/compaction.h>	2016-07-26 16:19:19 -07:00
zswap.c	…