linux/mm
Michal Hocko 1be171d60b memcg: track all children over limit in the root
Children in soft limit excess are currently tracked up the hierarchy in
memcg->children_in_excess.  Nevertheless there still might exist tons of
groups that are not in hierarchy relation to the root cgroup (e.g.  all
first level groups if root_mem_cgroup->use_hierarchy == false).

As the whole tree walk has to be done when the iteration starts at
root_mem_cgroup the iterator should be able to skip the walk if there is
no child above the limit without iterating them.  This can be done
easily if the root tracks all children rather than only hierarchical
children.  This is done by this patch which updates root_mem_cgroup
children_in_excess if root_mem_cgroup->use_hierarchy == false so the
root knows about all children in excess.

Please note that this is not an issue for inner memcgs which have
use_hierarchy == false because then only the single group is visited so
no special optimization is necessary.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Glauber Costa <glommer@openvz.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-12 15:38:01 -07:00
..
backing-dev.c
balloon_compaction.c
bootmem.c
bounce.c
cleancache.c
compaction.c
debug-pagealloc.c
dmapool.c
fadvise.c
failslab.c
filemap_xip.c
filemap.c lib/radix-tree.c: make radix_tree_node_alloc() work correctly within interrupt 2013-09-11 15:59:36 -07:00
fremap.c
frontswap.c
highmem.c
huge_memory.c
hugetlb_cgroup.c
hugetlb.c
hwpoison-inject.c mm/hwpoison-inject.c: change permission of corrupt-pfn/unpoison-pfn to 0200 2013-09-11 15:58:11 -07:00
init-mm.c
internal.h
interval_tree.c
Kconfig
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c
maccess.c
madvise.c mm/madvise.c:madvise_hwpoison(): remove local `ret' 2013-09-11 15:58:13 -07:00
Makefile
memblock.c
memcontrol.c memcg: track all children over limit in the root 2013-09-12 15:38:01 -07:00
memory_hotplug.c
memory-failure.c mm/memory-failure.c: fix bug triggered by unpoisoning empty zero page 2013-09-11 15:58:12 -07:00
memory.c
mempolicy.c
mempool.c mm/mempool.c: convert kmalloc_node(...GFP_ZERO...) to kzalloc_node(...) 2013-09-11 15:58:14 -07:00
migrate.c
mincore.c
mlock.c
mm_init.c
mmap.c mm/mmap: remove unnecessary assignment 2013-09-11 15:58:13 -07:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nobootmem.c
nommu.c
oom_kill.c
page_alloc.c mm: correct the comment about the value for buddy _mapcount 2013-09-11 15:58:06 -07:00
page_cgroup.c
page_io.c
page_isolation.c
page-writeback.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c
shmem.c initmpfs: make rootfs use tmpfs when CONFIG_TMPFS enabled 2013-09-11 15:59:37 -07:00
slab_common.c
slab.c
slab.h
slob.c
slub.c
sparse-vmemmap.c
sparse.c
swap_state.c lib/radix-tree.c: make radix_tree_node_alloc() work correctly within interrupt 2013-09-11 15:59:36 -07:00
swap.c
swapfile.c
truncate.c
util.c
vmalloc.c
vmpressure.c
vmscan.c memcg, vmscan: do not attempt soft limit reclaim if it would not scan anything 2013-09-12 15:38:01 -07:00
vmstat.c
zbud.c
zswap.c mm/zswap: use postorder iteration when destroying rbtree 2013-09-11 15:59:21 -07:00