Mel Gorman e341f2a89a mm: move zone->pages_scanned into a vmstat counter ... commit 0d5d823ab4 upstream. zone->pages_scanned is a write-intensive cache line during page reclaim and it's also updated during page free. Move the counter into vmstat to take advantage of the per-cpu updates and do not update it in the free paths unless necessary. On a small UMA machine running tiobench the difference is marginal. On a 4-node machine the overhead is more noticable. Note that automatic NUMA balancing was disabled for this test as otherwise the system CPU overhead is unpredictable. 3.16.0-rc3 3.16.0-rc3 3.16.0-rc3 vanillarearrange-v5 vmstat-v5 User 746.94 759.78 774.56 System 65336.22 58350.98 32847.27 Elapsed 27553.52 27282.02 27415.04 Note that the overhead reduction will vary depending on where exactly pages are allocated and freed. Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2015-01-29 17:40:53 -08:00
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acpi	ACPI / hotplug: Generate online uevents for ACPI containers	2014-10-05 14:52:16 -07:00
asm-generic	mm: use paravirt friendly ops for NUMA hinting ptes	2014-05-31 13:20:30 -07:00
clocksource	…
crypto	…
drm	drm/radeon: remove invalid pci id	2014-11-14 09:00:12 -08:00
dt-bindings	pinctrl: dra: dt-bindings: Fix output pull up/down	2014-11-21 09:23:02 -08:00
keys	…
kvm	ARM: KVM: fix non-VGIC compilation	2014-03-06 09:47:42 +01:00
linux	mm: move zone->pages_scanned into a vmstat counter	2015-01-29 17:40:53 -08:00
math-emu	math-emu: fix floating-point to integer overflow detection	2014-01-07 18:36:24 -06:00
media	media: vb2: fix VBI/poll regression	2014-10-09 12:21:27 -07:00
memory	…
misc	…
net	net: sctp: fix skb_over_panic when receiving malformed ASCONF chunks	2014-11-21 09:23:06 -08:00
pcmcia	…
ras	…
rdma	IB/core: Don't resolve passive side RoCE L2 address in CMA REQ handler	2014-05-06 07:59:28 -07:00
rxrpc	…
scsi	scsi: do not issue SCSI RSOC command to Promise Vtrak E610f	2014-09-17 09:19:14 -07:00
sound	ASoC: dpcm: Fix race between FE/BE updates and trigger	2014-12-06 15:55:35 -08:00
target	target: Report correct response length for some commands	2014-06-30 20:12:00 -07:00
trace	mm: pagemap: avoid unnecessary overhead when tracepoints are deactivated	2015-01-29 17:40:52 -08:00
uapi	in6: fix conflict with glibc	2015-01-27 08:18:53 -08:00
video	video: pxa168fb: Cleanup pxa168fb.h file	2014-01-17 10:57:43 +02:00
xen	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2014-02-14 10:45:18 -08:00
Kbuild	…