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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
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ABI mm: compaction: add /sys trigger for per-node memory compaction 2010-05-25 08:06:59 -07:00
DocBook docbook: make mtd nand module init static 2010-05-24 07:30:55 -07:00
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
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
accounting
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acpi
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aoe
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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
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blackfin
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block
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blockdev
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cdrom
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cgroups Merge branch 'master' into for-2.6.35 2010-05-21 21:27:26 +02:00
connector
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console
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cpu-freq
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cpuidle
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cris
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crypto
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development-process Documentation/development-process: add staging & mmotm info 2010-05-24 07:30:55 -07:00
device-mapper
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driver-model
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dvb
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early-userspace
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fault-injection
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fb
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filesystems mempolicy: document cpuset interaction with tmpfs mpol mount option 2010-05-25 08:06:57 -07:00
firmware_class
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frv
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hwmon
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i2c i2c-i801: Let the user disable selected driver features 2010-05-21 18:40:54 +02:00
i2o
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ia64
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ide
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infiniband
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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
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isdn
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ja_JP
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kbuild
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kdump
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ko_KR
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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
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m68k
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make
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mips
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misc-devices
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mn10300
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mtd
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namespaces
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netlabel
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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
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pcmcia
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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
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prctl
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s390
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scheduler
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scsi
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serial
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sh
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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
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spi
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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
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thermal
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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
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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
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watchdog
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wimax
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x86
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zh_CN
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00-INDEX Add a document describing the padata interface 2010-05-14 09:18:55 -06:00
BUG-HUNTING
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Changes
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CodingStyle
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DMA-API-HOWTO.txt
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DMA-API.txt
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DMA-ISA-LPC.txt
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DMA-attributes.txt
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HOWTO
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IO-mapping.txt
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IPMI.txt
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IRQ-affinity.txt
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IRQ.txt
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Intel-IOMMU.txt
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Makefile
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ManagementStyle
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SAK.txt
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SELinux.txt
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SM501.txt
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SecurityBugs
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Smack.txt
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SubmitChecklist Documentation: update SubmitChecklist for O=objdir and kconfig testing 2010-05-24 07:31:20 -07:00
SubmittingDrivers
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SubmittingPatches
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VGA-softcursor.txt
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applying-patches.txt
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atomic_ops.txt
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bad_memory.txt
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basic_profiling.txt
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binfmt_misc.txt
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braille-console.txt
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bt8xxgpio.txt
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btmrvl.txt
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cachetlb.txt
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circular-buffers.txt
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cpu-hotplug.txt
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cpu-load.txt
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cputopology.txt
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credentials.txt
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dcdbas.txt
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debugging-modules.txt
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debugging-via-ohci1394.txt
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dell_rbu.txt
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devices.txt
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dmaengine.txt
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dontdiff
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dynamic-debug-howto.txt
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edac.txt
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eisa.txt
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email-clients.txt
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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
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futex-requeue-pi.txt
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gcov.txt
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gpio.txt
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highuid.txt
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hw_random.txt
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init.txt
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initrd.txt
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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
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io_ordering.txt
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iostats.txt
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irqflags-tracing.txt
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isapnp.txt
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java.txt
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kernel-doc-nano-HOWTO.txt
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kernel-docs.txt
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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
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keys.txt
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kmemcheck.txt
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kmemleak.txt
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kobject.txt
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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
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ldm.txt
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leds-class.txt
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leds-lp3944.txt
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local_ops.txt
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lockdep-design.txt
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lockstat.txt
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logo.gif
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logo.txt
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magic-number.txt
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mca.txt
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md.txt
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memory-barriers.txt
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memory-hotplug.txt
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memory.txt
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mono.txt
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mutex-design.txt
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nmi_watchdog.txt
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nommu-mmap.txt
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numastat.txt
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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
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parport.txt
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pi-futex.txt
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pnp.txt
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preempt-locking.txt
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printk-formats.txt
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prio_tree.txt
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rbtree.txt
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rfkill.txt
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robust-futex-ABI.txt
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robust-futexes.txt
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rt-mutex-design.txt
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rt-mutex.txt
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rtc.txt
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serial-console.txt
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sgi-ioc4.txt
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sgi-visws.txt
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slow-work.txt
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sparse.txt
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spinlocks.txt
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stable_api_nonsense.txt
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stable_kernel_rules.txt
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svga.txt
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sysfs-rules.txt
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sysrq.txt Input: Documentation/sysrq.txt - update KEY_SYSRQ info 2010-05-19 10:14:15 -07:00
tomoyo.txt
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unaligned-memory-access.txt
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unicode.txt
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unshare.txt
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vgaarbiter.txt
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video-output.txt
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volatile-considered-harmful.txt
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zorro.txt
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