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Li Zefan 068b38c1fa memcg: fix a race when setting memory.swappiness 
(suppose: memcg->use_hierarchy == 0 and memcg->swappiness == 60)

echo 10 > /memcg/0/swappiness   |
  mem_cgroup_swappiness_write() |
    ...                         | echo 1 > /memcg/0/use_hierarchy
                                | mkdir /mnt/0/1
                                |   sub_memcg->swappiness = 60;
    memcg->swappiness = 10;     |

In the above scenario, we end up having 2 different swappiness
values in a single hierarchy.

We should hold cgroup_lock() when cheking cgrp->children list.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2009-01-15 16:39:41 -08:00
..
Kconfig Remove obsolete CONFIG_RESOURCES_64BIT 2009-01-06 15:59:14 -08:00
Makefile shmem: unify regular and tiny shmem 2009-01-06 15:59:08 -08:00
allocpercpu.c
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backing-dev.c Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-06 17:10:04 -08:00
bootmem.c bootmem: print request details before BUG_ON(them) 2009-01-06 15:59:10 -08:00
bounce.c
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dmapool.c
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fadvise.c [CVE-2009-0029] System call wrapper special cases 2009-01-14 14:15:18 +01:00
failslab.c
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filemap.c [CVE-2009-0029] System call wrapper special cases 2009-01-14 14:15:18 +01:00
filemap_xip.c badpage: remove vma from page_remove_rmap 2009-01-06 15:59:07 -08:00
fremap.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
highmem.c
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hugetlb.c mm: hugetlb: remove redundant `if' operation 2009-01-06 15:59:10 -08:00
internal.h mm: make get_user_pages() interruptible 2009-01-06 15:59:08 -08:00
maccess.c
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madvise.c [CVE-2009-0029] System call wrappers part 14 2009-01-14 14:15:24 +01:00
memcontrol.c memcg: fix a race when setting memory.swappiness 2009-01-15 16:39:41 -08:00
memory.c x86 PAT: change track_pfn_vma_new to take pgprot_t pointer param 2009-01-13 19:13:01 +01:00
memory_hotplug.c
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mempolicy.c [CVE-2009-0029] System call wrappers part 28 2009-01-14 14:15:30 +01:00
mempool.c
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migrate.c [CVE-2009-0029] System call wrappers part 28 2009-01-14 14:15:30 +01:00
mincore.c [CVE-2009-0029] System call wrappers part 14 2009-01-14 14:15:24 +01:00
mlock.c [CVE-2009-0029] System call wrappers part 14 2009-01-14 14:15:24 +01:00
mm_init.c
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mmap.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
mmu_notifier.c
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mmzone.c
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mprotect.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
mremap.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
msync.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
nommu.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
oom_kill.c memcg: avoid deadlock caused by race between oom and cpuset_attach 2009-01-08 08:31:09 -08:00
page-writeback.c mm: add dirty_background_bytes and dirty_bytes sysctls 2009-01-06 15:59:03 -08:00
page_alloc.c mm: introduce zone_reclaim struct 2009-01-08 08:31:07 -08:00
page_cgroup.c memcg: add mem_cgroup_disabled() 2009-01-08 08:31:05 -08:00
page_io.c mm: try_to_free_swap replaces remove_exclusive_swap_page 2009-01-06 15:59:03 -08:00
page_isolation.c
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pagewalk.c
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pdflush.c
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prio_tree.c
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quicklist.c
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readahead.c
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rmap.c badpage: remove vma from page_remove_rmap 2009-01-06 15:59:07 -08:00
shmem.c memcg: fix shmem's swap accounting 2009-01-08 08:31:10 -08:00
shmem_acl.c
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slab.c
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slob.c
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slub.c
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sparse-vmemmap.c
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sparse.c
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swap.c memcg: add zone_reclaim_stat 2009-01-08 08:31:08 -08:00
swap_state.c memcg: mem+swap controller core 2009-01-08 08:31:05 -08:00
swapfile.c [CVE-2009-0029] System call wrappers part 26 2009-01-14 14:15:29 +01:00
thrash.c
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truncate.c
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util.c
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vmalloc.c revert "mm: vmalloc use mutex for purge" 2009-01-15 16:39:40 -08:00
vmscan.c memcg: fix calculation of active_ratio 2009-01-08 08:31:09 -08:00
vmstat.c
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