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
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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
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
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
media	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-09-05 14:54:29 -07:00
memory
misc
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-09-11 14:33:16 -07:00
pcmcia
ras
rdma	Merge branches 'cxgb4', 'flowsteer', 'ipoib', 'iser', 'mlx4', 'ocrdma' and 'qib' into for-next	2013-09-03 09:01:08 -07:00
rxrpc
scsi
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
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