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Christoph Lameter 9614634fe6 [PATCH] ZVC/zone_reclaim: Leave 1% of unmapped pagecache pages for file I/O 
It turns out that it is advantageous to leave a small portion of unmapped file
backed pages if all of a zone's pages (or almost all pages) are allocated and
so the page allocator has to go off-node.

This allows recently used file I/O buffers to stay on the node and
reduces the times that zone reclaim is invoked if file I/O occurs
when we run out of memory in a zone.

The problem is that zone reclaim runs too frequently when the page cache is
used for file I/O (read write and therefore unmapped pages!) alone and we have
almost all pages of the zone allocated.  Zone reclaim may remove 32 unmapped
pages.  File I/O will use these pages for the next read/write requests and the
unmapped pages increase.  After the zone has filled up again zone reclaim will
remove it again after only 32 pages.  This cycle is too inefficient and there
are potentially too many zone reclaim cycles.

With the 1% boundary we may still remove all unmapped pages for file I/O in
zone reclaim pass.  However.  it will take a large number of read and writes
to get back to 1% again where we trigger zone reclaim again.

The zone reclaim 2.6.16/17 does not show this behavior because we have a 30
second timeout.

[akpm@osdl.org: rename the /proc file and the variable]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 		2006-07-03 15:26:59 -07:00
..
ABI [PATCH] Add kernel<->userspace ABI stability documentation 2006-06-21 12:40:47 -07:00
DocBook [PATCH] irq-flags: documentation: Use the new IRQF_ constants 2006-07-02 13:58:55 -07:00
RCU [PATCH] rcutorture: add ops vector and Classic RCU ops 2006-06-27 17:32:40 -07:00
aoe [PATCH] aoe [2/8]: support dynamic resizing of AoE devices 2006-03-23 22:01:55 -08:00
arm typo fixes: disadvantadge -> disadvantage 2006-06-30 18:23:39 +02:00
block [PATCH] Document online io scheduler switching 2006-04-20 13:04:36 +02:00
cdrom [PATCH] remove verify_area(): remove or edit references to verify_area in Documentation/ 2005-09-07 16:57:35 -07:00
connector [CONNECTOR]: Use netlink_has_listeners() to avoind unnecessary allocations. 2006-03-20 22:21:40 -08:00
console [PATCH] VT binding: Update documentation 2006-06-26 09:58:33 -07:00
cpu-freq [CPUFREQ] Update LART site URL 2006-04-03 07:25:54 -05:00
cris Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
crypto [PATCH] Spelling fixes for Documentation/ 2005-09-10 10:06:28 -07:00
device-mapper [PATCH] Fix dm-snapshot tutorial in Documentation 2005-11-07 07:53:54 -08:00
driver-model typo fixes 2006-06-26 19:05:40 +02:00
drivers/edac [PATCH] EDAC: documentation spelling fixes 2006-03-26 08:57:08 -08:00
dvb V4L/DVB (3832): Get_dvb_firmware: download nxt2002 firmware from new driver location 2006-05-12 19:55:17 -03:00
early-userspace earlyuserspace/README: fix homonym err 2005-11-08 17:16:50 +01:00
fb [PATCH] VT binding: Update documentation 2006-06-26 09:58:33 -07:00
filesystems Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2 2006-06-29 17:44:21 -07:00
firmware_class [PATCH] drivers/base/firmware_class.c: cleanups 2006-05-21 12:59:19 -07:00
fujitsu/frv Documentation: Make fujitsu/frv/kernel-ABI.txt 80 columns wide 2006-04-01 01:38:15 +02:00
hwmon [PATCH] lm70: New hardware monitoring driver 2006-06-22 11:10:35 -07:00
i2c [PATCH] i2c-i801: Remove force_addr parameter 2006-06-22 11:10:35 -07:00
i2o spelling: s/retreive/retrieve/ 2006-01-10 00:10:13 +01:00
i386 [PATCH] Make the bzImage format self-terminating 2005-09-07 16:57:29 -07:00
ia64 [IA64] rework memory attribute aliasing 2006-05-08 16:32:05 -07:00
infiniband IPoIB: Mention RFC numbers in documentation 2006-06-17 20:37:32 -07:00
input Input: gamecon - add SNES mouse support 2006-04-02 00:10:05 -05:00
ioctl spelling: s/appropiate/appropriate/ 2006-01-15 02:00:17 +01:00
isdn [PATCH] i4l gigaset: move sysfs entry to tty class device 2006-06-21 12:40:47 -07:00
kbuild kbuild: add option for stripping modules while installing them 2006-06-24 23:16:45 +02:00
kdump fix paniced->panicked typos 2006-06-26 18:30:00 +02:00
m68k [PATCH] Typo fixes 2006-03-28 09:16:08 -08:00
mips [MIPS] Update docs to reflect the latest status of the Alchemy IDE driver. 2006-02-14 19:13:23 +00:00
networking typo fixes in Documentation/networking/pktgen.txt 2006-06-30 18:28:43 +02:00
parisc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pcmcia [PATCH] pcmcia: expose tool in pcmcia/Documentation/pcmcia/ 2006-06-30 22:09:10 +02:00
power [PATCH] swsusp: documentation updates 2006-06-23 07:43:00 -07:00
powerpc [PATCH] powerpc: Kill _machine and hard-coded platform numbers 2006-03-28 23:15:54 +11:00
s390 [PATCH] s390: cio documentation update 2006-03-24 07:33:15 -08:00
scsi [PATCH] irq-flags: documentation: Use the new IRQF_ constants 2006-07-02 13:58:55 -07:00
serial [SERIAL] Update parity handling documentation 2006-06-02 17:47:26 +01:00
sh Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sound [PATCH] irq-flags: documentation: Use the new IRQF_ constants 2006-07-02 13:58:55 -07:00
sparc [Documentation]: Update probing info in sbus_drivers.txt 2006-06-23 23:16:17 -07:00
spi [PATCH] SPI: busnum == 0 needs to work 2006-05-16 14:33:57 -07:00
sysctl [PATCH] ZVC/zone_reclaim: Leave 1% of unmapped pagecache pages for file I/O 2006-07-03 15:26:59 -07:00
telephony Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
uml [PATCH] Spelling fixes for Documentation/ 2005-09-10 10:06:28 -07:00
usb [PATCH] USB: update usbmon.txt 2006-06-21 15:04:17 -07:00
video4linux V4L/DVB (4285): Cx88: add support for Geniatech Digistar / Digiwave 103g 2006-06-30 15:59:46 -03:00
vm [PATCH] page migration: sys_move_pages(): support moving of individual pages 2006-06-23 07:42:53 -07:00
w1 [PATCH] w1: Userspace communication protocol over connector. 2006-06-22 11:22:50 -07:00
watchdog [WATCHDOG] Documentation/watchdog update 2006-06-28 21:24:11 +02:00
x86_64 [PATCH] x86_64: Calgary IOMMU - Calgary specific bits 2006-06-26 10:48:19 -07:00
00-INDEX [PATCH] update Documentation/00-INDEX 2005-11-18 10:51:22 -08:00
BUG-HUNTING Documentation: Update to BUG-HUNTING 2006-03-22 00:37:42 +01:00
Changes [PATCH] devfs: Last little devfs cleanups throughout the kernel tree. 2006-06-26 12:25:09 -07:00
CodingStyle [PATCH] CodingStyle: add typedefs chapter 2006-06-23 07:43:08 -07:00
DMA-API.txt [PATCH] dma doc updates 2006-04-14 12:25:26 -07:00
DMA-ISA-LPC.txt [PATCH] ISA DMA API documentation 2005-09-09 14:03:42 -07:00
DMA-mapping.txt [PATCH] dma doc updates 2006-04-14 12:25:26 -07:00
HOWTO [PATCH] Added URI of "linux kernel development process" 2006-04-27 13:08:57 -07:00
IO-mapping.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
IPMI.txt [PATCH] Documentation/IPMI typos 2006-06-30 11:25:39 -07:00
IRQ-affinity.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
IRQ.txt [PATCH] genirq: irq: document what an IRQ is 2006-06-29 10:26:25 -07:00
MSI-HOWTO.txt [PATCH] Doc/MSI-HOWTO: cleanups 2005-11-07 07:53:55 -08:00
ManagementStyle Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
PCIEBUS-HOWTO.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
README.DAC960 [PATCH] devfs: Last little devfs cleanups throughout the kernel tree. 2006-06-26 12:25:09 -07:00
README.cycladesZ Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SAK.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SecurityBugs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SubmitChecklist [PATCH] add Doc/SubmitChecklist 2006-06-23 07:43:07 -07:00
SubmittingDrivers [PATCH] docs: update some updated code docs 2006-01-14 10:39:53 -08:00
SubmittingPatches [PATCH] docs: update some updated code docs 2006-01-14 10:39:53 -08:00
VGA-softcursor.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
acpi-hotkey.txt Fix minor documentation typo 2006-04-01 01:49:22 +02:00
applying-patches.txt [PATCH] Docs update: typos, corrections and additions to applying-patches.txt 2006-01-10 08:01:54 -08:00
atomic_ops.txt Spelling fixes for Documentation/atomic_ops.txt 2006-06-26 18:27:35 +02:00
basic_profiling.txt [PATCH] oprofile: report anonymous region samples 2005-06-24 00:06:27 -07:00
binfmt_misc.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cachetlb.txt [PATCH] Add flush_kernel_dcache_page() API 2006-03-26 08:56:53 -08:00
cciss.txt [SCSI] cciss: scsi error handling 2005-11-06 14:12:49 -06:00
cli-sti-removal.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
computone.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpqarray.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpu-hotplug.txt [PATCH] for_each_possible_cpu: documentaion 2006-03-28 09:16:05 -08:00
cpusets.txt [PATCH] cpuset memory spread basic implementation 2006-03-24 07:33:22 -08:00
cputopology.txt [PATCH] trivial typos in Documentation/cputopology.txt 2006-03-28 09:16:08 -08:00
dcdbas.txt [PATCH] dcdbas: add Dell Systems Management Base Driver with sysfs support 2005-09-07 16:57:27 -07:00
debugging-modules.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dell_rbu.txt [PATCH] dell_rbu: changes in packet update mechanism 2005-10-11 09:46:53 -07:00
devices.txt [PATCH] update-devices.txt 2006-06-25 10:01:26 -07:00
digiepca.txt typo fixes: aquire -> acquire 2006-06-30 18:23:04 +02:00
dnotify.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dontdiff [PATCH] dontdiff: add asm_offsets 2005-09-13 08:22:29 -07:00
eisa.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exception.txt [PATCH] remove verify_area(): remove or edit references to verify_area in Documentation/ 2005-09-07 16:57:35 -07:00
feature-removal-schedule.txt [PATCH] irq-flags: consolidate flags for request_irq 2006-07-02 13:58:46 -07:00
floppy.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
ftape.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hayes-esp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
highuid.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hpet.txt Documentation/hpet.txt typo 2006-01-15 02:09:54 +01:00
hrtimers.txt [PATCH] hrtimer: hrtimer documentation 2006-01-10 08:01:37 -08:00
hw_random.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ibm-acpi.txt [ACPI] IBM ThinkPad ACPI Extras Driver v0.12 2005-08-25 17:37:51 -04:00
ide.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
initrd.txt [PATCH] devfs: Last little devfs cleanups throughout the kernel tree. 2006-06-26 12:25:09 -07:00
io_ordering.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioctl-number.txt [PATCH] devfs: Last little devfs cleanups throughout the kernel tree. 2006-06-26 12:25:09 -07:00
iostats.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
isapnp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
java.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kernel-doc-nano-HOWTO.txt [PATCH] Doc/kernel-doc: add more usage info 2006-02-01 08:53:27 -08:00
kernel-docs.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
kernel-parameters.txt Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/devfs-2.6 2006-06-29 14:19:21 -07:00
keys-request-key.txt [PATCH] Keys: Allow in-kernel key requestor to pass auxiliary data to upcaller 2006-06-29 10:26:20 -07:00
keys.txt [PATCH] Keys: Allow in-kernel key requestor to pass auxiliary data to upcaller 2006-06-29 10:26:20 -07:00
kobject.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kprobes.txt [PATCH] kprobes: Update Documentation/kprobes.txt 2006-02-14 16:09:34 -08:00
kref.txt [PATCH] kref: add link to original documentation to the kref documentation. 2005-04-18 21:57:30 -07:00
laptop-mode.txt [PATCH] docs: laptop-mode.txt source file build 2006-04-11 06:18:44 -07:00
ldm.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
leds-class.txt [PATCH] LED: class documentation 2006-03-31 12:18:56 -08:00
locks.txt [PATCH] Docs update: remove obsolete patch from locks.txt 2006-01-10 08:01:54 -08:00
logo.gif Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
logo.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
magic-number.txt [PATCH] mm: rename kmem_cache_s to kmem_cache 2005-11-07 07:53:24 -08:00
mandatory.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mca.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
md.txt [PATCH] md: Allow the write_mostly flag to be set via sysfs 2006-06-26 09:58:40 -07:00
memory-barriers.txt typo fixes: occuring -> occurring 2006-06-30 18:27:16 +02:00
memory.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mono.txt [PATCH] merge some from Rusty's trivial patches 2005-09-10 10:06:30 -07:00
moxa-smartio Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mtrr.txt [PATCH] Doc: fix mtrr userspace programs to build cleanly 2006-04-11 06:18:44 -07:00
mutex-design.txt [PATCH] mutex subsystem, documentation 2006-01-09 15:59:20 -08:00
nbd.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nfsroot.txt [PATCH] Updated Documentation/nfsroot.txt 2006-03-24 07:33:27 -08:00
nmi_watchdog.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nommu-mmap.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
numastat.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
oops-tracing.txt [PATCH] doc: refer to kdump in oops-tracing.txt 2006-01-11 18:42:10 -08:00
paride.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
parport-lowlevel.txt [PATCH] parport: fix documentation 2006-02-03 08:32:06 -08:00
parport.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci-error-recovery.txt [PATCH] Documentation: Updated PCI Error Recovery 2006-02-03 08:32:00 -08:00
pci.txt [PATCH] irq-flags: documentation: Use the new IRQF_ constants 2006-07-02 13:58:55 -07:00
pi-futex.txt [PATCH] pi-futex: rt mutex docs 2006-06-27 17:32:47 -07:00
pm.txt [ACPI] linux-acpi@vger.kernel.org replaces acpi-devel@lists.sourceforge.net 2006-01-06 16:19:26 -05:00
pnp.txt [PATCH] pnp: PNP: adjust pnp_register_driver signature 2006-03-27 08:44:53 -08:00
preempt-locking.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
prio_tree.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ramdisk.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
riscom8.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
robust-futex-ABI.txt [PATCH] lightweight robust futexes updates 2006-03-27 08:44:49 -08:00
robust-futexes.txt [PATCH] pi-futex: robust futex docs fix 2006-06-27 17:32:46 -07:00
rocket.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rpc-cache.txt [PATCH] knfsd: Update rpc-cache.txt to match recent changes 2006-03-27 08:44:43 -08:00
rt-mutex-design.txt [PATCH] pi-futex: rt mutex docs 2006-06-27 17:32:47 -07:00
rt-mutex.txt [PATCH] pi-futex: rt mutex docs 2006-06-27 17:32:47 -07:00
rtc.txt [PATCH] rtc: small documentation update 2006-06-25 10:01:14 -07:00
sched-arch.txt [PATCH] sched: resched and cpu_idle rework 2005-11-09 07:56:33 -08:00
sched-coding.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sched-design.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sched-domains.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sched-stats.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
seclvl.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
serial-console.txt [PATCH] doc: more serial-console info 2006-03-25 08:23:00 -08:00
sgi-ioc4.txt [PATCH] ioc4: Core driver rewrite 2005-06-21 18:46:32 -07:00
sgi-visws.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sharedsubtree.txt [PATCH] Complete description of shared subtrees. 2005-11-07 18:18:11 -08:00
smart-config.txt kbuild: remove checkconfig.pl 2006-02-19 09:51:22 +01:00
smp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sonypi.txt [PATCH] sonypi SPIC initialisation fix 2005-09-07 16:57:24 -07:00
sparse.txt [PATCH] docs: update sparse.txt with CHECK_ENDIAN 2006-06-23 07:43:09 -07:00
specialix.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
spinlocks.txt fix rwlock usage example 2006-03-22 00:19:39 +01:00
stable_api_nonsense.txt [PATCH] stable_api_nonsense.txt fixes 2005-07-29 13:12:49 -07:00
stable_kernel_rules.txt [PATCH] Docs update: small fixes to stable_kernel_rules.txt 2006-01-10 08:01:55 -08:00
stallion.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
svga.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sx.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sysrq.txt [PATCH] Correct sa'K' description in sysrq.txt 2006-06-25 10:01:13 -07:00
time_interpolators.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tipar.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tty.txt [PATCH] Correct tty doc 2006-06-26 09:58:17 -07:00
unicode.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
unshare.txt [PATCH] unshare system call -v5: Documentation file 2006-02-07 16:12:34 -08:00
voyager.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
xterm-linux.xpm Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
zorro.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00

README.cycladesZ 

The Cyclades-Z must have firmware loaded onto the card before it will
operate.  This operation should be performed during system startup,

The firmware, loader program and the latest device driver code are
available from Cyclades at
    ftp://ftp.cyclades.com/pub/cyclades/cyclades-z/linux/