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Vladimir Davydov 2788cf0c40 memcg: reparent list_lrus and free kmemcg_id on css offline 
Now, the only reason to keep kmemcg_id till css free is list_lru, which
uses it to distribute elements between per-memcg lists.  However, it can
be easily sorted out - we only need to change kmemcg_id of an offline
cgroup to its parent's id, making further list_lru_add()'s add elements to
the parent's list, and then move all elements from the offline cgroup's
list to the one of its parent.  It will work, because a racing
list_lru_del() does not need to know the list it is deleting the element
from.  It can decrement the wrong nr_items counter though, but the ongoing
reparenting will fix it.  After list_lru reparenting is done we are free
to release kmemcg_id saving a valuable slot in a per-memcg array for new
cgroups.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-12 18:54:10 -08:00
..
backing-dev.c
balloon_compaction.c
bootmem.c
cleancache.c mm: fix cleancache debugfs directory path 2015-01-20 14:08:31 +01:00
cma.c mm: cma: fix totalcma_pages to include DT defined CMA regions 2015-02-11 17:06:03 -08:00
compaction.c mm/compaction: add tracepoint to observe behaviour of compaction defer 2015-02-11 17:06:04 -08:00
debug-pagealloc.c mm/debug-pagealloc: make debug-pagealloc boottime configurable 2014-12-13 12:42:48 -08:00
debug.c mm: account pmd page tables to the process 2015-02-11 17:06:04 -08:00
dmapool.c
early_ioremap.c
fadvise.c mm: fadvise: document the fadvise(FADV_DONTNEED) behaviour for partial pages 2014-12-13 12:42:49 -08:00
failslab.c
filemap.c mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2015-02-10 14:30:30 -08:00
filemap_xip.c mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2015-02-10 14:30:30 -08:00
frontswap.c
gup.c mm: convert p[te|md]_numa users to p[te|md]_protnone_numa 2015-02-12 18:54:08 -08:00
highmem.c
huge_memory.c mm: numa: avoid unnecessary TLB flushes when setting NUMA hinting entries 2015-02-12 18:54:08 -08:00
hugetlb.c mm: account pmd page tables to the process 2015-02-11 17:06:04 -08:00
hugetlb_cgroup.c mm: page_counter: pull "-1" handling out of page_counter_memparse() 2015-02-11 17:06:02 -08:00
hwpoison-inject.c
init-mm.c
internal.h mm: reduce try_to_compact_pages parameters 2015-02-11 17:06:02 -08:00
interval_tree.c mm: replace vma->sharead.linear with vma->shared 2015-02-10 14:30:31 -08:00
iov_iter.c
Kconfig rcu: Make SRCU optional by using CONFIG_SRCU 2015-01-06 11:04:29 -08:00
Kconfig.debug mm/debug_pagealloc: remove obsolete Kconfig options 2015-01-08 15:10:52 -08:00
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2015-02-10 14:30:31 -08:00
list_lru.c memcg: reparent list_lrus and free kmemcg_id on css offline 2015-02-12 18:54:10 -08:00
maccess.c
madvise.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2015-02-10 14:30:31 -08:00
Makefile mm: replace remap_file_pages() syscall with emulation 2015-02-10 14:30:30 -08:00
memblock.c mm/memblock.c: refactor functions to set/clear MEMBLOCK_HOTPLUG 2014-12-13 12:42:46 -08:00
memcontrol.c memcg: reparent list_lrus and free kmemcg_id on css offline 2015-02-12 18:54:10 -08:00
memory-failure.c vmscan: per memory cgroup slab shrinkers 2015-02-12 18:54:09 -08:00
memory.c mm: numa: add paranoid check around pte_protnone_numa 2015-02-12 18:54:08 -08:00
memory_hotplug.c
mempolicy.c mm: convert p[te|md]_mknonnuma and remaining page table manipulations 2015-02-12 18:54:08 -08:00
mempool.c
migrate.c mm: convert p[te|md]_mknonnuma and remaining page table manipulations 2015-02-12 18:54:08 -08:00
mincore.c mincore: apply page table walker on do_mincore() 2015-02-11 17:06:06 -08:00
mlock.c
mm_init.c
mmap.c mm/mmap.c: fix arithmetic overflow in __vm_enough_memory() 2015-02-11 17:06:07 -08:00
mmu_context.c
mmu_notifier.c
mmzone.c mm: microoptimize zonelist operations 2015-02-11 17:06:02 -08:00
mprotect.c mm: numa: avoid unnecessary TLB flushes when setting NUMA hinting entries 2015-02-12 18:54:08 -08:00
mremap.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2015-02-10 14:30:31 -08:00
msync.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2015-02-10 14:30:31 -08:00
nobootmem.c
nommu.c mm/nommu.c: fix arithmetic overflow in __vm_enough_memory() 2015-02-11 17:06:07 -08:00
oom_kill.c mm: account pmd page tables to the process 2015-02-11 17:06:04 -08:00
page-writeback.c page_writeback: put account_page_redirty() after set_page_dirty() 2015-02-11 17:06:04 -08:00
page_alloc.c mm: more aggressive page stealing for UNMOVABLE allocations 2015-02-11 17:06:06 -08:00
page_counter.c mm: page_counter: pull "-1" handling out of page_counter_memparse() 2015-02-11 17:06:02 -08:00
page_ext.c mm/page_owner: keep track of page owners 2014-12-13 12:42:48 -08:00
page_io.c
page_isolation.c
page_owner.c mm/page_owner.c: remove unnecessary stack_trace field 2015-02-11 17:06:07 -08:00
pagewalk.c mm: pagewalk: fix misbehavior of walk_page_range for vma(VM_PFNMAP) 2015-02-11 17:06:06 -08:00
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c mm: convert p[te|md]_mknonnuma and remaining page table manipulations 2015-02-12 18:54:08 -08:00
process_vm_access.c mm: gup: use get_user_pages_unlocked 2015-02-11 17:06:05 -08:00
quicklist.c
readahead.c
rmap.c mm: memcontrol: track move_lock state internally 2015-02-11 17:06:00 -08:00
shmem.c swap: remove unused mem_cgroup_uncharge_swapcache declaration 2015-02-11 17:06:00 -08:00
slab.c slab: link memcg caches of the same kind into a list 2015-02-12 18:54:09 -08:00
slab.h slab: link memcg caches of the same kind into a list 2015-02-12 18:54:09 -08:00
slab_common.c memcg: free memcg_caches slot on css offline 2015-02-12 18:54:10 -08:00
slob.c
slub.c slab: link memcg caches of the same kind into a list 2015-02-12 18:54:09 -08:00
sparse-vmemmap.c
sparse.c
swap.c rmap: drop support of non-linear mappings 2015-02-10 14:30:31 -08:00
swap_cgroup.c
swap_state.c
swapfile.c
truncate.c
util.c mm: gup: use get_user_pages_unlocked within get_user_pages_fast 2015-02-11 17:06:05 -08:00
vmacache.c mm,vmacache: count number of system-wide flushes 2014-12-13 12:42:48 -08:00
vmalloc.c mm/vmalloc.c: fix memory ordering bug 2014-12-13 12:42:49 -08:00
vmpressure.c
vmscan.c vmscan: per memory cgroup slab shrinkers 2015-02-12 18:54:09 -08:00
vmstat.c vmstat: Reduce time interval to stat update on idle cpu 2015-02-11 17:06:07 -08:00
workingset.c list_lru: add helpers to isolate items 2015-02-12 18:54:10 -08:00
zbud.c mm/zbud: init user ops only when it is needed 2014-12-13 12:42:51 -08:00
zpool.c
zsmalloc.c mm/zsmalloc: adjust order of functions 2014-12-18 19:08:11 -08:00
zswap.c mm/zswap: delete unnecessary check before calling free_percpu() 2014-12-13 12:42:50 -08:00