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Sha Zhengju 3ea67d06e4 memcg: add per cgroup writeback pages accounting 
Add memcg routines to count writeback pages, later dirty pages will also
be accounted.

After Kame's commit 89c06bd52f ("memcg: use new logic for page stat
accounting"), we can use 'struct page' flag to test page state instead
of per page_cgroup flag.  But memcg has a feature to move a page from a
cgroup to another one and may have race between "move" and "page stat
accounting".  So in order to avoid the race we have designed a new lock:

         mem_cgroup_begin_update_page_stat()
         modify page information        -->(a)
         mem_cgroup_update_page_stat()  -->(b)
         mem_cgroup_end_update_page_stat()

It requires both (a) and (b)(writeback pages accounting) to be pretected
in mem_cgroup_{begin/end}_update_page_stat().  It's full no-op for
!CONFIG_MEMCG, almost no-op if memcg is disabled (but compiled in), rcu
read lock in the most cases (no task is moving), and spin_lock_irqsave
on top in the slow path.

There're two writeback interfaces to modify: test_{clear/set}_page_writeback().
And the lock order is:
	--> memcg->move_lock
	  --> mapping->tree_lock

Signed-off-by: Sha Zhengju <handai.szj@taobao.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Greg Thelen <gthelen@google.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2013-09-12 15:38:02 -07:00
..
acpi Merge branch 'acpi-hotplug' 2013-08-30 14:14:25 +02:00
asm-generic Merge branch 'for-v3.12' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2013-09-09 10:26:33 -07:00
clocksource ARM: SoC cleanups for 3.12 2013-09-06 13:21:16 -07:00
crypto crypto: scatterwalk - Add support for calculating number of SG elements 2013-08-21 21:27:58 +10:00
drm Merge tag 'drm-intel-fixes-2013-09-06' of git://people.freedesktop.org/~danvet/drm-intel into drm-fixes 2013-09-10 12:36:55 +10:00
dt-bindings Device tree core updates for v3.12 2013-09-10 13:53:52 -07:00
keys
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kvm ARM: KVM: vgic: Bump VGIC_NR_IRQS to 256 2013-08-30 16:12:39 +03:00
linux memcg: add per cgroup writeback pages accounting 2013-09-12 15:38:02 -07:00
math-emu
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media Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-09-05 14:54:29 -07:00
memory
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misc
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net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-09-11 14:33:16 -07:00
pcmcia
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ras
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rdma Merge branches 'cxgb4', 'flowsteer', 'ipoib', 'iser', 'mlx4', 'ocrdma' and 'qib' into for-next 2013-09-03 09:01:08 -07:00
rxrpc
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scsi [SCSI] Generate uevents on certain unit attention codes 2013-08-26 18:52:27 +04:00
sound Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2013-09-05 11:55:59 -07:00
target
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trace mm/page_alloc.c: fix the value of fallback_migratetype in alloc_extfrag tracepoint() 2013-09-11 15:57:19 -07:00
uapi Add the ability to collect I/O statistics on user-defined regions of a 2013-09-10 13:06:15 -07:00
video fbdev changes for 3.12: 2013-09-05 09:49:32 -07:00
xen Features: 2013-09-04 17:45:39 -07:00
Kbuild
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