Mel Gorman 5e77190580 mm: compaction: add a tunable that decides when memory should be compacted and when it should be reclaimed ... The kernel applies some heuristics when deciding if memory should be compacted or reclaimed to satisfy a high-order allocation. One of these is based on the fragmentation. If the index is below 500, memory will not be compacted. This choice is arbitrary and not based on data. To help optimise the system and set a sensible default for this value, this patch adds a sysctl extfrag_threshold. The kernel will only compact memory if the fragmentation index is above the extfrag_threshold. [randy.dunlap@oracle.com: Fix build errors when proc fs is not configured] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Rik van Riel <riel@redhat.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-05-25 08:06:59 -07:00
..
ABI	mm: compaction: add /sys trigger for per-node memory compaction	2010-05-25 08:06:59 -07:00
accounting
acpi
aoe
arm	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-05-20 09:20:59 -07:00
auxdisplay
blackfin	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
block	Documentation: fix block/biodoc.txt dma mapping description	2010-03-08 09:11:07 +01:00
blockdev
cdrom
cgroups	Merge branch 'master' into for-2.6.35	2010-05-21 21:27:26 +02:00
connector	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
console	doc: fix console doc typo	2010-02-24 13:51:32 +01:00
cpu-freq	[CPUFREQ] Processor Clocking Control interface driver	2010-01-13 10:55:16 -05:00
cpuidle
cris
crypto
development-process	Documentation/development-process: add staging & mmotm info	2010-05-24 07:30:55 -07:00
device-mapper	dm: document when snapshot has finished merging	2010-03-06 02:29:56 +00:00
DocBook	docbook: make mtd nand module init static	2010-05-24 07:30:55 -07:00
driver-model	Fix spelling of 'platform' in comments and doc	2010-02-05 12:22:34 +01:00
dvb	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
early-userspace
fault-injection	lkdtm: add debugfs access and loosen KPROBE ties	2010-03-06 11:26:32 -08:00
fb	fbdev: rename imacfb.txt to efifb.txt and change imacfb to efifb.	2010-04-07 08:38:02 -07:00
filesystems	mempolicy: document cpuset interaction with tmpfs mpol mount option	2010-05-25 08:06:57 -07:00
firmware_class
frv
hwmon	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
i2c	i2c-i801: Let the user disable selected driver features	2010-05-21 18:40:54 +02:00
i2o
ia64
ide
infiniband
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-05-20 09:20:59 -07:00
ioctl	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2010-03-19 09:43:06 -07:00
isdn	gigaset: small documentation improvement	2010-02-26 01:24:22 -08:00
ja_JP
kbuild	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
kdump
ko_KR
kvm	KVM: MMU: Segregate shadow pages with different cr0.wp	2010-05-19 11:41:09 +03:00
laptops	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mjg59/platform-drivers-x86	2010-05-21 17:13:24 -07:00
lguest	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
m68k
make
mips
misc-devices
mn10300
mtd
namespaces
netlabel	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
networking	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2010-05-20 21:04:44 -07:00
parisc
PCI	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6	2010-05-21 18:58:52 -07:00
pcmcia	pcmcia: dev_node removal (core)	2010-05-10 10:23:17 +02:00
power	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6	2010-05-21 18:58:52 -07:00
powerpc	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2010-05-21 11:17:05 -07:00
pps
prctl
RCU	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-05-18 08:27:54 -07:00
s390	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
scheduler	sched: Remove USER_SCHED from documentation	2010-04-02 20:12:01 +02:00
scsi	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
serial	ldisc: new dcd_change() method for line disciplines	2010-03-12 15:52:43 -08:00
sh
sound	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6	2010-05-20 09:41:44 -07:00
sparc
spi	spi: spidev_test gives error upon 1-byte transfer	2010-04-29 16:40:30 -06:00
sysctl	mm: compaction: add a tunable that decides when memory should be compacted and when it should be reclaimed	2010-05-25 08:06:59 -07:00
telephony
thermal
timers	Documentation/timers/hpet_example: drop duplicate header files	2010-05-24 07:30:56 -07:00
trace	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-05-20 09:20:59 -07:00
uml
usb	Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6	2010-05-20 21:26:12 -07:00
video4linux	V4L/DVB: saa7134: Add support new Behold TV cards	2010-05-19 12:58:41 -03:00
vm	Documentation/vm: use better value for MAP_HUGETLB	2010-05-24 07:30:56 -07:00
w1	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
watchdog	[WATCHDOG] doc: Fix use of WDIOC_SETOPTIONS ioctl.	2010-04-06 14:23:55 +00:00
wimax
x86	x86, numa: Remove configurable node size support for numa emulation	2010-02-15 14:34:18 -08:00
zh_CN
00-INDEX	Add a document describing the padata interface	2010-05-14 09:18:55 -06:00
applying-patches.txt
atomic_ops.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
cachetlb.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
Changes	netfilter: xtables: remove xt_string revision 0	2010-03-25 17:04:57 +01:00
circular-buffers.txt	Document Linux's circular buffering capabilities	2010-03-24 16:31:22 -07:00
CodingStyle
cpu-hotplug.txt	cpumask: don't recommend set_cpus_allowed hack in Documentation/cpu-hotplug.txt	2009-12-17 11:43:29 +10:30
cpu-load.txt
cputopology.txt
credentials.txt	CRED: Holding a spinlock does not imply the holding of RCU read lock	2010-04-27 08:49:03 +10:00
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt
DMA-API-HOWTO.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
DMA-API.txt	Documentation: rename PCI-DMA-mapping.txt to DMA-API-HOWTO.txt	2010-03-12 15:52:43 -08:00
DMA-attributes.txt
DMA-ISA-LPC.txt
dmaengine.txt
dontdiff	Merge branch 'for-linus-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-kconfig	2010-02-25 14:43:57 -08:00
dynamic-debug-howto.txt
edac.txt
eisa.txt	doc: fix Defaultd -> Defaults typo in EISA doc	2010-02-05 12:22:39 +01:00
email-clients.txt	Documentation/email-clients.txt: update gmail information	2010-03-12 15:52:35 -08:00
feature-removal-schedule.txt	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2010-05-20 21:04:44 -07:00
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
gpio.txt	gpio: introduce gpio_request_one() and friends	2010-03-06 11:26:48 -08:00
highuid.txt
HOWTO	Documentation/HOWTO: update git home URL	2010-04-22 15:24:56 -07:00
hw_random.txt
init.txt	init/main.c: improve usability in case of init binary failure	2010-03-06 11:26:29 -08:00
initrd.txt
Intel-IOMMU.txt
intel_txt.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-05-20 09:20:59 -07:00
io-mapping.txt
IO-mapping.txt	Documentation: fix ioremap return type	2010-01-02 10:09:44 -08:00
io_ordering.txt
iostats.txt
IPMI.txt	ipmi: add parameter to limit CPU usage in kipmid	2010-03-12 15:52:39 -08:00
IRQ-affinity.txt
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt	documentation: update kernel-doc-nano-HOWTO information	2010-01-11 09:34:07 -08:00
kernel-docs.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
kernel-parameters.txt	echi-dbgp: Add kernel debugger support for the usb debug port	2010-05-20 21:04:31 -05:00
keys-request-key.txt
keys.txt
kmemcheck.txt
kmemleak.txt
kobject.txt	kobject: documentation: Update to refer to kset-example.c.	2010-03-19 07:12:20 -07:00
kprobes.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-05-20 09:20:59 -07:00
kref.txt
ldm.txt
leds-class.txt
leds-lp3944.txt
local_ops.txt
lockdep-design.txt
lockstat.txt
logo.gif
logo.txt
magic-number.txt
Makefile	Documentation/fs/: split txt and source files	2010-03-12 15:52:35 -08:00
ManagementStyle
mca.txt
md.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
memory-barriers.txt	Document Linux's circular buffering capabilities	2010-03-24 16:31:22 -07:00
memory-hotplug.txt
memory.txt
mono.txt
mutex-design.txt
nmi_watchdog.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt	panic: Add taint flag TAINT_FIRMWARE_WORKAROUND ('I')	2010-05-19 08:37:43 +01:00
padata.txt	Add a document describing the padata interface	2010-05-14 09:18:55 -06:00
parport-lowlevel.txt
parport.txt
pi-futex.txt
pnp.txt	doc: capitalization and other minor fixes in pnp doc	2010-02-05 12:22:44 +01:00
preempt-locking.txt
printk-formats.txt
prio_tree.txt
rbtree.txt	rbtree: Add support for augmented rbtrees	2010-02-18 15:40:56 -08:00
rfkill.txt	Document the rfkill sysfs ABI	2010-03-10 17:09:33 -05:00
robust-futex-ABI.txt
robust-futexes.txt
rt-mutex-design.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
rt-mutex.txt
rtc.txt
SAK.txt
SecurityBugs
SELinux.txt
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
slow-work.txt
SM501.txt
Smack.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
sparse.txt	doc: Change urls for sparse	2010-04-27 22:59:07 +02:00
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt	Documentation: -stable rules: upstream commit ID requirement reworded	2010-04-22 15:24:56 -07:00
SubmitChecklist	Documentation: update SubmitChecklist for O=objdir and kconfig testing	2010-05-24 07:31:20 -07:00
SubmittingDrivers
SubmittingPatches
svga.txt
sysfs-rules.txt	Fix typos in comments	2010-03-16 11:47:56 +01:00
sysrq.txt	Input: Documentation/sysrq.txt - update KEY_SYSRQ info	2010-05-19 10:14:15 -07:00
tomoyo.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
vgaarbiter.txt	vgaarbiter: fix a typo in the vgaarbiter Documentation	2009-12-16 11:28:58 -08:00
video-output.txt
volatile-considered-harmful.txt	Documentation/volatile-considered-harmful.txt: correct cpu_relax() documentation	2010-03-24 16:31:20 -07:00
zorro.txt