Michal Hocko f61c42a7d9 memcg: remove tasks/children test from mem_cgroup_force_empty() ... Tejun has correctly pointed out that tasks/children test in mem_cgroup_force_empty is not correct because there is no other locking which preserves this state throughout the rest of the function so both new tasks can join the group or new children groups can be added while somebody is writing to memory.force_empty. A new task would break mem_cgroup_reparent_charges expectation that all failures as described by mem_cgroup_force_empty_list are temporal and there is no way out. The main use case for the knob as described by Documentation/cgroups/memory.txt is to: " The typical use case for this interface is before calling rmdir(). Because rmdir() moves all pages to parent, some out-of-use page caches can be moved to the parent. If you want to avoid that, force_empty will be useful. " This means that reparenting is not really required as rmdir will reparent pages implicitly from the safe context. If we remove it from mem_cgroup_force_empty then we are safe even with existing tasks because the number of reclaim attempts is bounded. Moreover the knob still does what the documentation claims (modulo reparenting which doesn't make any difference) and users might expect. Longterm we want to deprecate the whole knob and put the reparented pages to the tail of parent LRU during cgroup removal. tj: Removed unused variable @cgrp from mem_cgroup_force_empty() Signed-off-by: Michal Hocko <mhocko@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Li Zefan <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2014-05-16 13:22:48 -04:00
..
backing-dev.c	bdi: avoid oops on device removal	2014-04-03 16:20:49 -07:00
balloon_compaction.c	mm: print more details for bad_page()	2014-01-23 16:36:50 -08:00
bootmem.c	mm/bootmem.c: remove unused local `map'	2013-11-13 12:09:09 +09:00
bounce.c	block: Convert bio_for_each_segment() to bvec_iter	2013-11-23 22:33:49 -08:00
cleancache.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
compaction.c	mm, compaction: determine isolation mode only once	2014-04-07 16:35:55 -07:00
debug-pagealloc.c
dmapool.c	dmapool: make DMAPOOL_DEBUG detect corruption of free marker	2012-12-11 17:22:24 -08:00
early_ioremap.c	mm: create generic early_ioremap() support	2014-04-07 16:36:15 -07:00
fadvise.c	teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long	2013-03-03 22:46:22 -05:00
failslab.c
filemap_xip.c	seqcount: Add lockdep functionality to seqcount/seqlock structures	2013-11-06 12:40:26 +01:00
filemap.c	mm: fix new kernel-doc warning in filemap.c	2014-04-18 16:40:09 -07:00
fremap.c	mm: fix bad rss-counter if remap_file_pages raced migration	2014-03-19 16:21:49 -07:00
frontswap.c	frontswap: fix incorrect zeroing and allocation size for frontswap_map	2013-06-12 16:29:46 -07:00
highmem.c	Some nice cleanups, and even a patch my wife did as a "live" demo for	2012-12-20 08:37:05 -08:00
huge_memory.c	thp: close race between split and zap huge pages	2014-04-18 16:40:09 -07:00
hugetlb_cgroup.c	cgroup: remove css_parent()	2014-05-16 13:22:48 -04:00
hugetlb.c	mm/hugetlb.c: add cond_resched_lock() in return_unused_surplus_pages()	2014-04-18 16:40:08 -07:00
hwpoison-inject.c	mm/hwpoison: add '#' to hwpoison_inject	2014-01-21 16:19:48 -08:00
init-mm.c
internal.h	mm/readahead.c: inline ra_submit	2014-04-07 16:35:58 -07:00
interval_tree.c	mm: add CONFIG_DEBUG_VM_RB build option	2012-10-09 16:22:42 +09:00
iov_iter.c	take iov_iter stuff to mm/iov_iter.c	2014-04-01 23:19:30 -04:00
Kconfig	mm: create generic early_ioremap() support	2014-04-07 16:36:15 -07:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c	kmemleak: change some global variables to int	2014-04-03 16:20:50 -07:00
ksm.c	mm: close PageTail race	2014-03-04 07:55:47 -08:00
list_lru.c	mm: keep page cache radix tree nodes in check	2014-04-03 16:21:01 -07:00
maccess.c
madvise.c	mm/hwpoison: fix traversal of hugetlbfs pages to avoid printk flood	2013-09-30 14:31:02 -07:00
Makefile	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-04-12 14:49:50 -07:00
memblock.c	mm/memblock.c: use PFN_PHYS()	2014-04-07 16:35:58 -07:00
memcontrol.c	memcg: remove tasks/children test from mem_cgroup_force_empty()	2014-05-16 13:22:48 -04:00
memory_hotplug.c	mm/memory_hotplug.c: move register_memory_resource out of the lock_memory_hotplug	2014-01-23 16:36:52 -08:00
memory-failure.c	Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2014-04-03 13:05:42 -07:00
memory.c	mm: remove unused arg of set_page_dirty_balance()	2014-04-07 16:35:57 -07:00
mempolicy.c	mm, mempolicy: remove per-process flag	2014-04-07 16:35:54 -07:00
mempool.c	mempool: add unlikely and likely hints	2014-04-07 16:35:55 -07:00
migrate.c	mm: fix swapops.h:131 bug if remap_file_pages raced migration	2014-03-20 22:09:09 -07:00
mincore.c	mm + fs: prepare for non-page entries in page cache radix trees	2014-04-03 16:21:00 -07:00
mlock.c	mm: try_to_unmap_cluster() should lock_page() before mlocking	2014-04-07 16:35:57 -07:00
mm_init.c	mm: bring back /sys/kernel/mm	2014-01-27 21:02:39 -08:00
mmap.c	mm: per-thread vma caching	2014-04-07 16:35:53 -07:00
mmu_context.c	sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm	2014-02-21 08:50:17 +01:00
mmu_notifier.c	mm: audit/fix non-modular users of module_init in core code	2014-01-23 16:36:52 -08:00
mmzone.c	mm: numa: Change page last {nid,pid} into {cpu,pid}	2013-10-09 14:47:45 +02:00
mprotect.c	mm: move mmu notifier call from change_protection to change_pmd_range	2014-04-07 16:35:50 -07:00
mremap.c	mm: revert mremap pud_free anti-fix	2013-10-16 21:35:53 -07:00
msync.c
nobootmem.c	mm/nobootmem.c: mark function as static	2014-04-03 16:21:02 -07:00
nommu.c	mm: fix 'ERROR: do not initialise globals to 0 or NULL' and coding style	2014-04-07 16:35:55 -07:00
oom_kill.c	mm, oom: base root bonus on current usage	2014-01-30 16:56:56 -08:00
page_alloc.c	mm/page_alloc.c: change mm debug routines back to EXPORT_SYMBOL	2014-04-07 16:35:59 -07:00
page_cgroup.c	mm/page_cgroup.c: mark functions as static	2014-04-03 16:21:02 -07:00
page_io.c	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
page_isolation.c	mm: memory-hotplug: enable memory hotplug to handle hugepage	2013-09-11 15:57:48 -07:00
page-writeback.c	mm: remove unused arg of set_page_dirty_balance()	2014-04-07 16:35:57 -07:00
pagewalk.c	mm/pagewalk.c: fix walk_page_range() access of wrong PTEs	2013-10-30 14:27:03 -07:00
percpu-km.c
percpu-vm.c	mm: fix kernel-doc warnings	2012-06-20 14:39:36 -07:00
percpu.c	percpu: renew the max_contig if we merge the head and previous block	2014-03-29 09:29:42 -04:00
pgtable-generic.c	mm: fix TLB flush race between migration, and change_protection_range	2013-12-18 19:04:51 -08:00
process_vm_access.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-04-12 14:49:50 -07:00
quicklist.c
readahead.c	mm/readahead.c: inline ra_submit	2014-04-07 16:35:58 -07:00
rmap.c	mm: try_to_unmap_cluster() should lock_page() before mlocking	2014-04-07 16:35:57 -07:00
shmem.c	mm: Initialize error in shmem_file_aio_read()	2014-04-13 14:10:26 -07:00
slab_common.c	memcg, slab: do not destroy children caches if parent has aliases	2014-04-07 16:36:13 -07:00
slab.c	Merge branch 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux	2014-04-13 13:28:13 -07:00
slab.h	memcg, slab: never try to merge memcg caches	2014-04-07 16:36:12 -07:00
slob.c	mm: slab/slub: use page->list consistently instead of page->lru	2014-04-11 10:06:06 +03:00
slub.c	Merge branch 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux	2014-04-13 13:28:13 -07:00
sparse-vmemmap.c	mm/sparse: use memblock apis for early memory allocations	2014-01-21 16:19:47 -08:00
sparse.c	mm: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:35:54 -07:00
swap_state.c	swap: add a simple detector for inappropriate swapin readahead	2014-02-06 13:48:51 -08:00
swap.c	mm: thrash detection-based file cache sizing	2014-04-03 16:21:01 -07:00
swapfile.c	mm/swap: fix race on swap_info reuse between swapoff and swapon	2014-02-06 13:48:51 -08:00
truncate.c	mm: keep page cache radix tree nodes in check	2014-04-03 16:21:01 -07:00
util.c	Merge git://git.infradead.org/users/eparis/audit	2014-04-12 12:38:53 -07:00
vmacache.c	mm: per-thread vma caching	2014-04-07 16:35:53 -07:00
vmalloc.c	mm/vmalloc.c: enhance vm_map_ram() comment	2014-04-07 16:35:55 -07:00
vmpressure.c	arm, pm, vmpressure: add missing slab.h includes	2014-02-03 13:24:01 -05:00
vmscan.c	vmscan: reclaim_clean_pages_from_list() must use mod_zone_page_state()	2014-04-18 16:40:07 -07:00
vmstat.c	CPU hotplug notifiers registration fixes for 3.15-rc1	2014-04-07 14:55:46 -07:00
workingset.c	mm: keep page cache radix tree nodes in check	2014-04-03 16:21:01 -07:00
zbud.c	mm/zbud: fix some trivial typos in comments	2013-09-11 15:57:35 -07:00
zsmalloc.c	zsmalloc: Fix CPU hotplug callback registration	2014-03-20 13:43:45 +01:00
zswap.c	Merge branch 'akpm' (incoming from Andrew)	2014-04-07 16:38:06 -07:00